Oxygen-enriched combustion heating coke oven body structure and coke oven oxygen-enriched combustion method

Abstract

The invention relates to an oxygen-enriched combustion heating coke oven body structure and a coke oven oxygen-enriched combustion method, a combustion chamber is divided into a plurality of vertical flame paths, and an oxygen-enriched combustor is arranged at the bottom of each vertical flame path; a flue gas collecting channel is arranged at the top of the combustion chamber; a flue gas collecting channel outlet is formed in the furnace top of the machine side or the coke side; and the top of each vertical flame path is connected with a flue gas collecting channel outlet through a flue gas collecting channel. According to the invention, oxygen-enriched combustion and combustion waste gas return and distribution technologies are adopted, and the content of carbon dioxide in combustion waste gas is increased, so that the radiation heat transfer capacity and heat utilization rate in the coke oven are improved; by reducing the content of nitrogen in the combustion-supporting gas, the reaction intensity of generating nitric oxide through combustion of oxygen and nitrogen in the combustion chamber is weakened, and generation of nitric oxide is reduced; flameless combustion in a coke oven combustion chamber is realized through oxygen-enriched combustion, and the temperature of a high-temperature area is reduced; the bottleneck limitation of an existing nitrogen oxide source emission reduction technology is broken through, and generation of nitrogen oxides in the combustion chamber is further reduced.

Description

Technical Field

[0001] This invention relates to the field of coke oven production technology, and in particular to a coke oven structure and a coke oven oxygen-enriched combustion heating method. Background Technology

[0002] Modern large coke ovens mostly adopt segmented heating and waste gas recirculation to reduce coking energy consumption and reduce the generation of nitrogen oxides in the vertical flue. After multiple rounds of structural optimization, their energy consumption reduction and emission reduction levels have basically reached their limit. There is an urgent need for an innovative heating method and a new furnace structure to break through the energy-saving and emission-reduction limits under the traditional coke oven heating method. Summary of the Invention

[0003] This invention provides a coke oven structure and a coke oven oxygen-enriched combustion method, employing oxygen-enriched combustion (oxygen content in the combustion gas is greater than 21%) and combustion exhaust gas recycling technology. By increasing the carbon dioxide content in the combustion exhaust gas, the radiative heat transfer capacity and heat utilization rate within the coke oven are improved, reducing the amount of coke oven flue gas and minimizing waste heat loss, thereby achieving energy-saving effects such as reducing coking gas consumption and coking calorific value. By reducing the nitrogen content in the combustion gas, the reaction intensity of oxygen and nitrogen combustion to generate nitric oxide in the combustion chamber is weakened, reducing nitric oxide formation. Oxygen-enriched combustion achieves flameless combustion in the coke oven combustion chamber, lowering the temperature in the high-temperature zone. This invention overcomes the bottleneck limitations of existing nitrogen oxide source reduction technologies, further reducing nitrogen oxide formation in the combustion chamber.

[0004] To achieve the above objectives, the present invention employs the following technical solution: A coke oven structure for oxygen-enriched combustion heating includes a combustion chamber, a carbonization chamber, and a top. The combustion chamber and carbonization chamber are spaced apart, with combustion chambers on both sides of each carbonization chamber, and the top of the combustion chamber and carbonization chamber is the top of the top. Along the coke oven machine side-coke side direction, the combustion chamber is divided into multiple vertical flues, and each vertical flue has an oxygen-enriched burner at its bottom. The top of the combustion chamber is provided with corresponding flue gas collection channels, and the top of the top of the machine side or coke side of the oven has a flue gas collection channel outlet. The top of each vertical flue is connected to the corresponding flue gas collection channel outlet through the corresponding flue gas collection channel.

[0005] Along the direction from the outlet of the flue gas collection channel to the outlet of the flue gas collection channel, the height of the partition wall between each vertical flue in the same combustion chamber decreases sequentially.

[0006] The combustion chamber has a trapezoidal cross-sectional shape that is narrower at the top and wider at the bottom.

[0007] The furnace top is equipped with observation holes, which are set one-to-one with the vertical fire channels. The observation holes are connected to the corresponding vertical fire channels through the corresponding flue gas collection channels.

[0008] The coke oven is a top-loading coke oven, with a coal charging hole at the top of each carbonization chamber and a gas outlet hole at the top of the oven on the machine side or coke side.

[0009] The coke oven is a tamping coke oven, with dust removal holes at the top of each carbonization chamber and gas outlet holes at the top of the oven on the machine side or coke side.

[0010] The gas outlet and the flue gas coke collection channel outlet are located on different sides of the coke oven.

[0011] A method for oxygen-enriched combustion in a coke oven includes the following steps: 1) Fuel and combustion-supporting gas enter the oxygen-enriched burners at the bottom of each vertical flue and are burned in the vertical flue. The combustion-supporting gas consists of recycled combustion exhaust gas and oxygen, and the oxygen content in the combustion-supporting gas is greater than 21%. 2) The combustion exhaust gas produced by combustion flows from bottom to top in each vertical flue. Since the vertical flue has a trapezoidal structure that is narrow at the top and wide at the bottom, the circulation time of the combustion exhaust gas in the vertical flue is prolonged, which reduces the temperature of the combustion zone. 3) The combustion exhaust gas flowing out from the top of each flue enters the corresponding flue gas collection channel, flows out from the corresponding combustion exhaust gas outlet, and is returned to the combustion-supporting gas through the return distribution pipeline.

[0012] Compared with the prior art, the beneficial effects of the present invention are: 1) By adopting oxygen-enriched combustion (oxygen content in the combustion gas is greater than 21%) and combustion exhaust gas recycling technology, the radiative heat transfer capacity and heat utilization rate in the coke oven are improved by increasing the carbon dioxide content in the combustion exhaust gas, thereby reducing the amount of coke oven flue gas and reducing the waste heat loss of flue gas, thus achieving the energy-saving effect of reducing the amount of coking coal gas and reducing the heat consumption of coking; by reducing the nitrogen content in the combustion gas, the reaction intensity of oxygen and nitrogen combustion in the combustion chamber to generate nitric oxide is weakened, thereby reducing the generation of nitric oxide.

[0013] 2) An oxygen-enriched burner is installed at the bottom of the vertical flue. Combined with the trapezoidal cross-section of the vertical flue structure, flameless combustion is achieved in the coke oven combustion chamber, reducing the temperature in the high-temperature zone. This breaks through the existing technical bottleneck of nitrogen oxide emission reduction at the source and further reduces the generation of nitrogen oxides in the combustion chamber.

[0014] 3) The combustion chamber is divided into multiple vertical flues, but unlike conventional multi-connected vertical flues, each vertical flue in this invention is an independent channel with rising internal airflow, and the top of each vertical flue is connected to the flue gas collection channel, which increases the heat transfer efficiency from the combustion chamber to the carbonization chamber.

[0015] 4) An oxygen-enriched burner is installed at the bottom of the vertical flue for direct heating, eliminating the need for the heat storage chamber and inclined flue structure in traditional coke ovens. This greatly simplifies the coke oven structure, reduces the overall elevation of the coke oven, and saves a significant amount of construction costs. Attached Figure Description

[0016] Figure 1 This is a front cross-sectional view of the coke oven body structure for oxygen-enriched combustion heating as described in this invention.

[0017] Figure 2 yes Figure 1 AA view in the middle.

[0018] Figure 3 yes Figure 1 BB view in the middle.

[0019] In the diagram: 1. Combustion chamber 2. Carbonization chamber 3. Oxygen-enriched burner 4. Flue gas collection channel 5. Inspection hole 6. Furnace top 7. Flue gas collection channel outlet 8. Vertical flue 9. Gas outlet 10. Coal charging hole / dust removal hole 11. Carbonization chamber partition wall Detailed Implementation

[0020] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings: like Figures 1-3 As shown, the coke oven body structure for oxygen-enriched combustion heating according to the present invention includes a combustion chamber 1, a carbonization chamber 2, and a furnace top 6; the combustion chamber 1 and the carbonization chamber 2 are spaced apart, and each carbonization chamber 2 has a combustion chamber 1 on both sides, with the furnace top 6 above the combustion chamber 1 and the carbonization chamber 2; along the coke oven machine side-coke side direction, the combustion chamber 1 is divided into multiple vertical fire channels 8, and each vertical fire channel 8 has an oxygen-enriched burner 3 at its bottom; the top of the combustion chamber 1 is provided with a flue gas collection channel 4 corresponding to each other, and the furnace top 6 on the machine side or coke side is provided with a flue gas collection channel outlet 7; the top of each vertical fire channel 8 is connected to the corresponding flue gas collection channel outlet 7 through the corresponding flue gas collection channel 4.

[0021] Along the direction from the outlet 7 of the flue gas collection channel to the outlet 7 of the flue gas collection channel, the height of the partition wall between each vertical flue 8 in the same combustion chamber 1 decreases sequentially.

[0022] The combustion chamber 1 has a trapezoidal cross-sectional shape that is narrower at the top and wider at the bottom.

[0023] The furnace top 6 is provided with a fire observation hole 5, which is set one-to-one with the vertical fire channel 8. The fire observation hole 5 is connected to the corresponding vertical fire channel 8 through the corresponding flue gas collection channel 4.

[0024] The coke oven is a top-loading coke oven, with a coal charging hole 10 at the top 6 of each carbonization chamber 2, and a gas outlet hole 9 at the top 6 of the coke oven on the machine side or coke side.

[0025] The coke oven is a tamping coke oven, with dust removal holes 10 provided at the top 6 of each carbonization chamber 2, and gas outlet holes 9 provided at the top 6 of the coke oven on the machine side or coke side.

[0026] The gas outlet 9 and the flue gas coke collection channel outlet 7 are located on different sides of the coke oven.

[0027] The present invention discloses an oxygen-enriched combustion method for coke ovens, comprising the following processes: 1) Fuel and combustion-supporting gas enter the oxygen-enriched burner 3 at the bottom of each vertical flue 8 and are burned in the vertical flue 8. The combustion-supporting gas is composed of recycled combustion exhaust gas and oxygen, and the oxygen content in the combustion-supporting gas is greater than 21%. 2) The combustion exhaust gas generated by combustion flows from bottom to top in each vertical flue 8. Since the vertical flue 8 has a trapezoidal structure that is narrow at the top and wide at the bottom, the circulation time of the combustion exhaust gas in the vertical flue 8 is prolonged, and the temperature of the combustion zone is reduced. 3) The combustion exhaust gas flowing out from the top of each flue 8 is collected into the corresponding flue gas collection channel 4, flows out from the corresponding combustion exhaust gas outlet 7, and is returned to the combustion-supporting gas through the return distribution pipeline.

[0028] The present invention discloses a coke oven body structure for oxygen-enriched combustion heating, comprising combustion chambers 1, carbonization chambers 2 and a furnace top 6 arranged at intervals, wherein each carbonization chamber 2 is provided with combustion chambers 1 on both sides (the number of combustion chambers 1 is one more than the number of carbonization chambers 2).

[0029] Along the transverse direction of the coke oven (perpendicular to the machine side-coke side), the cross-sectional shape of combustion chamber 1 is a trapezoid, narrower at the top and wider at the bottom. This breaks away from the traditional concept of using a rectangular cross-section for coke oven combustion chambers. The trapezoidal cross-section of combustion chamber 1 increases the internal circulation of combustion exhaust gas within the vertical flue 8, which helps to reduce the temperature of the combustion zone, promotes the formation of flameless combustion, and avoids localized high temperatures within the vertical flue 8.

[0030] Along the longitudinal direction of the coke oven (machine side to coke side), the combustion chamber 1 is divided into multiple vertical flues 8 (each vertical flue 8 has a trapezoidal cross-sectional shape). The top of the vertical flues 8 connects to the flue gas collection channel 4, and the outlet 7 of the flue gas collection channel is located in the oven top 6 area on the machine side or coke side. Unlike the traditional method of dividing the combustion chamber into multiple vertical flues (multi-connected vertical flues), in this invention, the airflow direction in all vertical flues 8 is unidirectional from bottom to top, which increases the heat transfer efficiency from the combustion chamber 1 to the carbonization chamber 2.

[0031] Each vertical combustion chamber 8 is equipped with an oxygen-enriched burner 3 at its bottom. Fuel and combustion-supporting gas directly enter the oxygen-enriched burner 3 and burn within the vertical combustion chamber 8. The combustion-supporting gas mainly consists of recycled combustion exhaust gas and oxygen, with an oxygen content (by volume) greater than 21%.

[0032] In this invention, the main components of the combustion-supporting gas are oxygen and recycled combustion exhaust gas. Water vapor and carbon dioxide in the combustion exhaust gas replace nitrogen in conventional combustion air as inert gases, thereby increasing the carbon dioxide content and reducing the nitrogen content in the combustion-supporting gas.

[0033] By increasing the carbon dioxide content in the combustion-supporting gas, the radiative heat transfer capacity and heat utilization rate inside the coke oven are improved, the amount of coke oven flue gas is reduced, and the waste heat loss of flue gas is reduced, thereby achieving the energy-saving effect of reducing the amount of coking gas used and reducing the heat consumption of coking.

[0034] By reducing the nitrogen content in the combustion-supporting gas, the reaction intensity of oxygen and nitrogen combustion in the combustion chamber to produce nitric oxide is weakened, thereby reducing the amount of nitric oxide generated.

[0035] In addition, this invention eliminates the regenerator structure of traditional air-assisted combustion coke ovens, significantly reducing the height of the coke oven, saving refractory materials, and also saving a lot of cost for furnace protection equipment.

[0036] In order to facilitate the exhaust gas from combustion, the vertical flue 8 can be designed with different heights; that is, along the direction from the outlet 7 of the flue gas collection channel to the outlet 7 of the flue gas collection channel, the height of the partition wall between each vertical flue 8 in the same combustion chamber 1 decreases sequentially.

[0037] The coke oven structure described in this invention is applicable to top-loading coke ovens or tamped coke ovens. The difference between the two is that the top-loading coke oven has a coal charging hole 10 and a gas outlet hole 9 on the top of the carbonization chamber 2, while the tamped coke oven has a dust removal hole 10 and a gas outlet hole 9 on the top of the carbonization chamber 2. The flue gas collection channel outlet 7 and the gas outlet hole 9 are set separately (one is located on the machine side, and the other is located on the coke side).

[0038] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A coke oven body structure for oxygen-enriched combustion heating, characterized in that, It includes a combustion chamber, a carbonization chamber, and a furnace top; the combustion chamber and the carbonization chamber are spaced apart, and each carbonization chamber has a combustion chamber on both sides, with the furnace top above the combustion chamber and the carbonization chamber; along the coke oven machine side-coke side direction, the combustion chamber is divided into multiple vertical flues, and each vertical flue has an oxygen-enriched burner at its bottom; the top of the combustion chamber is provided with a flue gas collection channel corresponding to each other, and the furnace top on the machine side or coke side is provided with a flue gas collection channel outlet; the top of each vertical flue is connected to the corresponding flue gas collection channel outlet through the corresponding flue gas collection channel.

2. The coke oven body structure for oxygen-enriched combustion heating according to claim 1, characterized in that, Along the direction from the outlet of the flue gas collection channel to the outlet of the flue gas collection channel, the height of the partition wall between each vertical flue in the same combustion chamber decreases sequentially.

3. The coke oven body structure for oxygen-enriched combustion heating according to claim 1, characterized in that, The combustion chamber has a trapezoidal cross-sectional shape that is narrower at the top and wider at the bottom.

4. The coke oven body structure for oxygen-enriched combustion heating according to claim 1, characterized in that, The furnace top is equipped with observation holes, which are set one-to-one with the vertical fire channels. The observation holes are connected to the corresponding vertical fire channels through the corresponding flue gas collection channels.

5. The coke oven body structure for oxygen-enriched combustion heating according to claim 1, characterized in that, The coke oven is a top-loading coke oven, with a coal charging hole at the top of each carbonization chamber and a gas outlet hole at the top of the oven on the machine side or coke side.

6. The coke oven body structure for oxygen-enriched combustion heating according to claim 1, characterized in that, The coke oven is a tamping coke oven, with dust removal holes at the top of each carbonization chamber and gas outlet holes at the top of the oven on the machine side or coke side.

7. A coke oven body structure for oxygen-enriched combustion heating according to claim 5 or 6, characterized in that, The gas outlet and the flue gas coke collection channel outlet are located on different sides of the coke oven.

8. A coke oven oxygen-enriched combustion method based on the coke oven body structure as described in any of claims 1 to 6, characterized in that, The process includes the following: 1) Fuel and combustion-supporting gas enter the oxygen-enriched burners at the bottom of each vertical flue and are burned in the vertical flue. The combustion-supporting gas consists of recycled combustion exhaust gas and oxygen, and the oxygen content in the combustion-supporting gas is greater than 21%. 2) The combustion exhaust gas produced by combustion flows from bottom to top in each vertical flue. Since the vertical flue has a trapezoidal structure that is narrow at the top and wide at the bottom, the circulation time of the combustion exhaust gas in the vertical flue is prolonged, which reduces the temperature of the combustion zone. 3) The combustion exhaust gas flowing out from the top of each flue enters the corresponding flue gas collection channel, flows out from the corresponding combustion exhaust gas outlet, and is returned to the combustion-supporting gas through the return distribution pipeline.

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