Coking device for oxygen-deficient combustion and byproduct hydrogen-rich product

Abstract

The utility model relates to a coking device for oxygen-deficient combustion and byproduct hydrogen-rich product, which comprises a coking system and a waste heat recovery and purification system, the coking system comprises an oxygen preheater, a pipeline mixer, an oxygen nozzle, a carbonization chamber, oxygen-deficient combustion areas, reduction areas and a secondary reduction area, the oxygen-deficient combustion areas are arranged on two sides of the coke oven carbonization chamber, and the secondary reduction area is arranged on the pipeline mixer. The top of each oxygen-deficient combustion area is provided with a plurality of gas channels, each gas channel is provided with an oxygen nozzle and is sequentially connected with a pipeline mixer and an oxygen preheater through a flow regulating valve, the bottom of each oxygen-deficient combustion area is provided with a reduction area, the reduction areas converge and are connected to a secondary reduction area, and the secondary reduction area is connected with a waste heat recovery and purification system. The coke oven gas treatment device has the beneficial effects that heat loss in the high-temperature coke oven gas treatment process is avoided, heat is fully utilized, energy is saved, emission is reduced, pollution is reduced, coke oven gas is greatly subjected to resource utilization, and the resource utilization rate is high.

Description

Technical Field

[0001] The utility model relates to the technical field of coking technology with oxygen-deficient combustion and by-product of hydrogen-rich products, in particular to a coking device with oxygen-deficient combustion and by-product of hydrogen-rich products. Background Art

[0002] In the traditional coking process, coal is carbonized in the carbonization chamber of the coke oven in the absence of air to produce coke. At the same time, the coke oven gas generated is completely burned to heat the carbonization chamber. In the traditional heat recovery coke oven of the traditional process, after the coke oven gas is completely burned, it enters the atmosphere in the form of CO2 and water vapor after waste heat recovery and gas purification, resulting in serious energy waste and having a major adverse impact on the surrounding ecology. At the same time, hydrogen can be used as a reducing agent for reducing carbon dioxide and is even more essential in the entire chemical industry system; the clean coke oven gas contains a large amount of hydrogen. Directly using it for combustion power generation not only has poor economic benefits but also causes great waste of hydrogen resources, and the excess hydrogen is not fully utilized. Summary of the Invention

[0003] In order to solve the above technical problems existing in the prior art, the utility model provides a coking device with oxygen-deficient combustion and by-product of hydrogen-rich products. By guiding the gas flow direction in the furnace, the coke oven gas undergoes an oxygen-deficient combustion reaction in the oxygen-deficient combustion zone adjacent to the carbonization chamber to supply heat for the carbonization of coal in the carbonization chamber. At the same time, heat is supplied to the reduction zone and the secondary reduction zone arranged at the bottom of the coke oven to ensure that the coke oven gas undergoes a chemical reaction in the two reduction zones to be converted into a low-carbon hydrogen-rich reducing gas, which not only reduces the energy consumption of the overall process flow, greatly reduces the emission of carbon dioxide in the coking process, maximizes the utilization of coke oven gas resources, and obtains a hydrogen-rich reducing gas by-product.

[0004] To achieve the above purpose, the utility model is realized by adopting the following technical solutions:

[0005] A coking device with oxygen-deficient combustion and by-product of hydrogen-rich products includes a coking system and a waste heat recovery and purification system. The coking system includes an oxygen preheater, a pipeline mixer, an oxygen nozzle, a carbonization chamber, an oxygen-deficient combustion zone, a reduction zone, and a secondary reduction zone. The oxygen-deficient combustion zones are arranged on both sides of the carbonization chamber of the coke oven. The oxygen-deficient combustion zones and the carbonization chambers are arranged alternately longitudinally in the coke oven. The outermost sides at both ends of the coke oven are arranged with oxygen-deficient combustion zones. A plurality of air ducts are arranged at the top of each oxygen-deficient combustion zone, and one oxygen nozzle is arranged in each air duct. The plurality of oxygen nozzles in each oxygen-deficient combustion zone are connected in parallel to a flow regulating valve, and the flow regulating valve is sequentially connected to the pipeline mixer and the oxygen preheater. The reduction zones that are independent of each other are arranged at the bottom of the oxygen-deficient combustion zones, and the bottoms of all the reduction zones are convergently connected to a through-length secondary reduction zone. The outlet of the secondary reduction zone is connected to the waste heat recovery and purification system through a high-temperature pipeline.

[0006] Further, the waste heat recovery and purification system includes a waste heat boiler, water washing for temperature reduction, and desulfurization and decarbonization. The waste heat boiler is connected to the water washing for temperature reduction, and the water washing for temperature reduction is connected to the desulfurization and decarbonization.

[0007] Further, the waste heat boiler includes a slag screen tube, a superheater, a saturator, and a gas economizer arranged in sequence inside, a steam drum configured at the top, and an ash hopper and an ash bin arranged at the bottom.

[0008] Further, a pressure reducing valve is arranged between the oxygen preheater and the pipeline mixer.

[0009] Further, the oxygen nozzle is provided with a water jacket.

[0010] Further, the jet orifice of the oxygen nozzle is arranged vertically downward at the top of the oxygen-deficient combustion zone.

[0011] Further, a high-temperature expansion joint is arranged on the high-temperature pipeline.

[0012] Further, a temperature detector is arranged in the reduction zone.

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

[0014] 1. By optimizing the coking equipment, energy is saved and consumption is reduced. The high-temperature coke oven gas generated by coking directly undergoes an oxygen-deficient combustion reaction with oxygen to supply heat for the coal dry distillation in the carbonization chamber, avoiding heat loss during the treatment of high-temperature coke oven gas, and the heat is fully utilized, saving energy.

[0015] 2. The CO2 and water vapor generated after oxygen-deficient combustion are reduced by the unburned methane in the coke oven gas to CO and hydrogen. CO2 and water vapor do not need to be discharged in large quantities, saving energy and reducing emissions, reducing pollution. CO2 and water vapor are converted into hydrogen and carbon monoxide, which can be applied to industrial production, realizing resource utilization of coke oven gas with a high resource utilization rate.

[0016] 3. The obtained hydrogen-rich product can be directly used as a reducing agent in the field of hydrogen metallurgy in an iron and steel integrated enterprise, and can be used for hydrogen extraction or as syngas to produce bulk chemical commodities in an independent coking enterprise, with wide applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic structural diagram of a coking device with oxygen-deficient combustion and by-product hydrogen-rich products according to the present utility model.

[0018] In the figure: 1 - oxygen preheater, 2 - pipeline mixer, 3 - oxygen nozzle, 4 - coke oven, 5 - oxygen-deficient combustion zone, 6 - reduction zone, 7 - secondary reduction zone, 8 - carbonization chamber, 9 - high-temperature pipeline, 10 - waste heat boiler, 11 - slag-congealing pipe, 12 - superheater, 13 - saturator, 14 - economizer, 15 - steam drum, 16 - ash hopper, 17 - ash bin, 18 - water washing for temperature reduction, 19 - desulfurization and decarbonization, 20 - pressure reducing valve, 21 - flow regulating valve, 22 - temperature detector, 23 - high-temperature expansion joint, 24 - fan, A - oxygen, B - CO2 and water vapor. Detailed implementation manners

[0019] The following further describes the detailed implementation manners of the present utility model with reference to the accompanying drawings:

[0020] As Figure 1As shown in the figure, a coking plant for oxygen-deficient combustion and by-product hydrogen-rich products includes a coking system and a waste heat recovery and purification system. The coking system includes an oxygen preheater 1, a pipeline mixer 2, an oxygen nozzle 3, a carbonization chamber 8, an oxygen-deficient combustion zone 5, a reduction zone 6, and a secondary reduction zone 7. The oxygen-deficient combustion zone 5 is arranged on both sides of the carbonization chamber 8 of the coke oven 4. The oxygen-deficient combustion zone 5 and the carbonization chamber 8 are arranged alternately longitudinally in the coke oven 4. The outermost sides at both ends of the coke oven 4 are arranged with oxygen-deficient combustion zones 5. The coal used for coking is loaded into the carbonization chamber 8 through a coal charging car. The high-temperature coke oven gas generated during the coal dry distillation process enters the oxygen-deficient combustion zone 5 from the top of the partition wall. A number of air channels are arranged at the top of each oxygen-deficient combustion zone 5, and one oxygen nozzle 3 is arranged in each air channel. The several oxygen nozzles 3 in each oxygen-deficient combustion zone 5 are connected in parallel to a flow regulating valve 21. The flow regulating valve 21 is sequentially connected to the pipeline mixer 2 and the oxygen preheater 1. In the coking system, the oxygen A obtained by external air separation is preheated by the oxygen preheater 1 and then enters the pipeline mixer 2. After being mixed with CO2 and water vapor B in the pipeline mixer 2, the concentration of oxygen A in the oxygen mixture decreases. The oxygen mixture enters the several oxygen nozzles 3 at the top of the oxygen-deficient combustion zone 5 through the flow regulating valve 21 and jets into the oxygen-deficient combustion zone 5 from the top. The oxygen mixture with reduced oxygen A concentration undergoes an oxygen-deficient combustion reaction with the high-temperature coke oven gas escaping from the carbonization chamber 8 in the oxygen-deficient combustion zone 5. The large amount of heat generated supplies heat to the carbonization chamber 8 and at the same time raises the temperature of the gas itself. In the oxygen-deficient combustion reaction, some combustible components cannot be completely burned. The mixture after oxygen-deficient combustion enters the reduction zone 6 at the bottom of the oxygen-deficient combustion zone 5. The unburned methane reacts chemically with CO2 and water vapor B to produce CO and hydrogen. The reduction zones 6 are arranged independently at the bottom of the oxygen-deficient combustion zone 5. The bottoms of all reduction zones 6 converge and are connected to a long secondary reduction zone 7. The outlet of the secondary reduction zone 7 is connected to the waste heat recovery and purification system through a high-temperature pipeline 9. After the oxygen mixture undergoes the oxygen-deficient combustion reaction, it enters the reduction zone 6 for a chemical reaction, and part of the CO2 and water vapor B are reduced to CO and hydrogen; the hydrogen-containing reduction gases from all reduction zones 6 converge and enter the secondary reduction zone 7. The secondary reduction zone 7 is a long overall reduction zone with a sudden increase in space and a slowdown in gas flow. The gas at the outlet of each reduction zone 6 stirs and merges inside the secondary reduction zone 7, increasing the reduction reaction time of CO2 and water vapor B and increasing the content of CO and hydrogen. The gas passing through the secondary reduction zone 7 is transformed into a hydrogen-rich reduction gas and enters the waste heat recovery and purification system through the high-temperature pipeline 9;

[0021] As Figure 1As shown, further, the waste heat recovery and purification system includes a waste heat boiler 10, a water washing and cooling unit 18, and a desulfurization and decarbonization unit 19. The high-temperature hydrogen-rich reducing gas sequentially passes through a slag coagulation tube 11, a superheater 12, a saturator 13, and an economizer 15 in the waste heat boiler 10 and then enters the water washing and cooling unit 18 to further reduce the temperature. The waste heat boiler 10 is preferably a horizontal waste heat boiler, and an ash hopper 16 and an ash bin 17 are arranged at the bottom. After the hydrogen-rich reducing gas is washed with water, it enters a fan 24 for pressurization. The pressurized hydrogen-rich reducing gas then undergoes desulfurization and decarbonization in the desulfurization and decarbonization unit 19, and a hydrogen-containing by-product is obtained after the removal.

[0022] As Figure 1 shown, further, the waste heat boiler 10 includes a slag coagulation tube 11, a superheater 12, a saturator 13, and an economizer 14 arranged in sequence inside, a steam drum 15 is configured at the top, and an ash hopper 16 and an ash bin 17 are arranged at the bottom.

[0023] As Figure 1 shown, further, a pressure reducing valve 20 is arranged between the oxygen preheater 1 and the pipeline mixer 2. The oxygen is preheated first and then decompressed. Carbon dioxide and water vapor are mixed in the pipeline mixer 2. After the oxygen mixture enters the oxygen-deficient combustion zone 5, the reaction intensity of the oxygen-deficient combustion zone 5 is slowed down, and the high-directional heating uniformity of the carbonization chamber 8 is promoted.

[0024] As Figure 1 shown, further, the oxygen nozzle 3 is provided with a water jacket.

[0025] As Figure 1 shown, further, the jet orifice of the oxygen nozzle 3 is arranged vertically downward at the top of the oxygen-deficient combustion zone 5.

[0026] As Figure 1 shown, further, a high-temperature expansion joint 23 is arranged on the high-temperature pipeline 9. The high-temperature expansion joint 23 compensates for the thermal expansion and contraction deformation of the high-temperature pipeline 9 under high-temperature conditions.

[0027] As Figure 1 shown, further, a temperature detector 22 is arranged in the reduction zone 6. The temperature detector 22 corresponds to a flow regulating valve 21 at the top of the oxygen-deficient combustion zone 5. The gas temperature is fed back through the temperature detector 22, and the flow rate of the oxygen mixture entering the oxygen-deficient combustion zone 5 of the flow regulating valve 21 is adjusted according to the gas temperature. If the temperature of the reduction zone 6 is too low, the flow rate of the flow regulating valve 21 is increased to increase the reaction intensity in the oxygen-deficient combustion zone 5 and raise the temperature of each reaction zone.

[0028] The above are only the preferred specific embodiments of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model, according to the technical solution and its concept of the present utility model, making equivalent substitutions or changes, shall be covered by the protection scope of the present utility model.

Claims

1. A coking unit for oxygen-deficient combustion and by-production of hydrogen-rich products, comprising a coking system and a waste heat recovery and purification system, characterized in that, The described coking system includes an oxygen preheater, a pipeline mixer, an oxygen nozzle, a carbonization chamber, an oxygen-deficient combustion zone, a reduction zone, and a secondary reduction zone. The oxygen-deficient combustion zone is arranged on both sides of the coking chamber of the coke oven. The oxygen-deficient combustion zone and the carbonization chamber are arranged alternately longitudinally in the coke oven. The outermost sides at both ends of the coke oven are arranged with oxygen-deficient combustion zones. A number of air ducts are arranged at the top of each oxygen-deficient combustion zone. One oxygen nozzle is arranged in each air duct. A number of oxygen nozzles in each oxygen-deficient combustion zone are connected in parallel to a flow regulating valve. The flow regulating valve is connected to the pipeline mixer and the oxygen preheater in sequence. An independent reduction zone is arranged at the bottom of each oxygen-deficient combustion zone. The bottoms of all reduction zones converge and are connected to a long secondary reduction zone. The outlet of the secondary reduction zone is connected to a waste heat recovery and purification system through a high-temperature pipeline.

2. The coking unit for oxygen-deficient combustion and by-product of hydrogen-rich products according to claim 1, characterized in that, The described waste heat recovery and purification system includes a waste heat boiler, water washing for temperature reduction, and desulfurization and decarbonization. The waste heat boiler is connected to water washing for temperature reduction at the back, and water washing for temperature reduction is connected to desulfurization and decarbonization.

3. The coking unit for oxygen-deficient combustion and by-product of hydrogen-rich products according to claim 2, characterized in that, The described waste heat boiler includes a slag screen tube, a superheater, a saturator, and a gas economizer arranged in sequence inside, a steam drum configured at the top, and an ash hopper and an ash bin arranged at the bottom.

4. A coking device for oxygen-deficient combustion and by-product of hydrogen-rich products according to claim 1, characterized in that, A pressure reducing valve is arranged between the oxygen preheater and the pipeline mixer.

5. The coking unit for oxygen-deficient combustion and by-product of hydrogen-rich products according to claim 1, characterized in that, The oxygen nozzle is provided with a water jacket.

6. The coking device for oxygen-depleted combustion and by-product of hydrogen-rich products according to claim 1, characterized in that, The jet orifice of the oxygen nozzle is arranged vertically downward at the top of the oxygen-deficient combustion zone.

7. An oxygen-deficient combustion coking unit with by-product hydrogen-rich products according to claim 1, characterized in that, A high-temperature expansion joint is arranged on the high-temperature pipeline.

8. The coking unit for oxygen-deficient combustion and by-product of hydrogen-rich products according to claim 1, characterized in that A temperature detector is arranged inside the reduction zone.

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