An energy-saving and emission-reducing coking system

Abstract

This utility model belongs to the technical field of coking systems, specifically relating to an energy-saving and emission-reducing coking system, including a coke oven, a coke quenching tower, a coke storage unit, a bridge pipe, and a gas purification workshop. A riser heat exchanger is installed between the gas phase output end of the coke oven and the bridge pipe. The high-temperature side input end of the riser heat exchanger is connected to the gas phase output end of the coke oven, the high-temperature side output end of the riser heat exchanger is connected to the bridge pipe, the low-temperature side input end of the riser heat exchanger is connected to the output end of the heat exchange medium, and the low-temperature side output end of the riser heat exchanger is connected to a heat recovery unit. This utility model recovers the waste heat carried in the raw coal gas by adding a riser heat exchanger, realizing the recovery and utilization of waste heat from the raw coal gas, greatly improving energy utilization efficiency, and achieving energy saving and emission reduction effects.

Description

Technical Field

[0001] This utility model belongs to the technical field of coking systems, and specifically relates to an energy-saving and emission-reducing coking system. Background Technology

[0002] A coking system is an industrial device that converts coal into coke through high-temperature dry distillation and simultaneously recovers byproducts such as coal gas and coal tar.

[0003] A coking system generally includes a coke oven, a quenching tower, a coke storage unit, a bridge pipe, and a gas purification workshop. When the coking system is working, the blended coal sent from the coal preparation unit is heated to 950-1050℃ in the coke oven. Then, through coking processes such as pyrolysis, melting, solidification, and shrinkage, coke and coke oven gas are produced. After quenching, the coke is sent to the coke storage unit. The raw gas is cooled by circulating ammonia water spraying in the bridge pipe and then sent to the gas purification workshop for purification and recovery.

[0004] However, traditional coking systems suffer from serious energy waste. The raw coal gas contains a large amount of waste heat, which is discharged with the exhaust gas and is not effectively utilized. In addition, the coke oven generates a large amount of dust during the coal charging and discharging process, causing environmental pollution. Utility Model Content

[0005] To address the problems existing in the prior art, this utility model provides an energy-saving and emission-reducing coking system. By adding a riser heat exchanger to recover the waste heat carried in the raw coal gas, the system achieves the recovery and utilization of the waste heat of the raw coal gas, greatly improving energy utilization efficiency and achieving the effect of energy saving and emission reduction.

[0006] The specific technical solution adopted in this utility model is as follows:

[0007] An energy-saving and emission-reducing coking system includes a coke oven, a quenching tower, a coke storage unit, a bridge pipe, and a gas purification workshop. The raw material input end of the coke oven is connected to the output end of the coal preparation unit, the fuel input end of the coke oven is connected to the output end of the heating gas pipeline, the solid phase output end of the coke oven is connected to the input end of the quenching tower, the output end of the quenching tower is connected to the coke storage unit, and the gas phase output end of the coke oven is connected to the gas purification workshop via the bridge pipe. A riser heat exchanger is also installed between the gas phase output end of the coke oven and the bridge pipe. The high-temperature side input end of the riser heat exchanger is connected to the gas phase output end of the coke oven, the high-temperature side output end of the riser heat exchanger is connected to the bridge pipe, the low-temperature side input end of the riser heat exchanger is connected to the output end of the heat exchange medium, and the low-temperature side output end of the riser heat exchanger is connected to the heat recovery unit.

[0008] A gas preheater is also installed between the heating gas pipeline and the coke oven, and the low-temperature output end of the riser heat exchanger is also connected to the fuel input end of the gas preheater.

[0009] The raw material input end and solid phase output end of the coke oven are respectively connected to the dust collection ground station via dust collection fans.

[0010] The riser heat exchanger includes an outer shell, a jacket, and an inner cylinder. The outer shell is fitted onto the outside of the jacket, and the jacket is fitted onto the outside of the inner cylinder. A low-temperature heat exchange channel is formed between the jacket and the inner cylinder, and the cavity of the inner cylinder forms a high-temperature heat exchange channel. The riser heat exchanger is also provided with an inlet and an outlet. Both the inlet and the outlet pass through the outer shell and the jacket and are connected to the low-temperature heat exchange channel. The inlet forms the low-temperature input end of the riser heat exchanger, and the outlet forms the low-temperature output end of the riser heat exchanger. The input end of the high-temperature heat exchange channel forms the high-temperature input end of the riser heat exchanger, and the output end of the high-temperature heat exchange channel forms the high-temperature output end of the riser heat exchanger.

[0011] The pipe at the gas phase output end of the coke oven is inclinedly connected to the inner cylinder of the riser heat exchanger, and the raw coal gas output from the coke oven is introduced into the high-temperature heat exchange channel in an inclined upward direction.

[0012] The inner wall of the inner cylinder is provided with spiral corrugated guide grooves, and the raw coal gas rises in a spiral shape in the high-temperature heat exchange channel with the help of the guide grooves.

[0013] The beneficial effects of this utility model are:

[0014] 1. This utility model includes an ascender heat exchanger for recovering the waste heat carried in the raw coal gas. As the raw coal gas flows from the coke oven gas phase output end to the bridge tube, a large amount of heat carried by it is absorbed by the ascender heat exchanger and transferred to the heat exchange medium on the low temperature side. The heat exchange medium then transports the heat to the heat recovery unit, realizing the recovery and utilization of the waste heat of the raw coal gas, greatly improving energy utilization efficiency and reducing energy waste.

[0015] 2. This utility model is equipped with a dust collection fan and a dust removal ground station. The flue gas generated during the coal charging and coking process is drawn to the dust removal ground station for purification through a large dust collection hood and fan, thereby reducing the degree of environmental pollution. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the process of this system;

[0017] Figure 2 This is a schematic diagram of a riser heat exchanger.

[0018] In the attached diagram, 1 is the coke oven, 2 is the outer shell, 3 is the jacket, 4 is the inner cylinder, 5 is the low-temperature heat exchange channel, 6 is the high-temperature heat exchange channel, 7 is the water inlet, 8 is the water outlet, and 9 is the guide channel. Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0020] Specific embodiments, such as Figure 1 As shown, this utility model provides an energy-saving and emission-reducing coking system, including a coke oven 1, a quenching tower, a coke storage unit, a bridge pipe, and a gas purification workshop. The raw material input end of the coke oven 1 is connected to the output end of the coal preparation unit, the fuel input end of the coke oven 1 is connected to the output end of the heating gas pipeline, the solid phase output end of the coke oven 1 is connected to the input end of the quenching tower, the output end of the quenching tower is connected to the coke storage unit, and the gas phase output end of the coke oven 1 is connected to the gas purification workshop via the bridge pipe. A riser heat exchanger is also provided between the gas phase output end of the coke oven 1 and the bridge pipe. The high-temperature side input end of the riser heat exchanger is connected to the gas phase output end of the coke oven 1, the high-temperature side output end of the riser heat exchanger is connected to the bridge pipe, the low-temperature side input end of the riser heat exchanger is connected to the output end of the heat exchange medium, and the low-temperature side output end of the riser heat exchanger is connected to the heat recovery unit.

[0021] Traditional coking systems suffer from severe energy waste. The raw coal gas contains a large amount of waste heat, which is discharged with the exhaust gas and is not effectively utilized. In addition, coke oven 1 generates a large amount of dust during the coal charging and discharging process, causing environmental pollution.

[0022] Therefore, this utility model includes an ascender heat exchanger to recover the waste heat carried in the raw coal gas. During the process of the raw coal gas flowing from the gas phase output end of coke oven 1 to the bridge tube, a large amount of heat carried by it is absorbed by the ascender heat exchanger and transferred to the heat exchange medium on the low temperature side. The heat exchange medium then transports the heat to the heat recovery unit, realizing the recovery and utilization of the waste heat of the raw coal gas, greatly improving energy utilization efficiency and reducing energy waste.

[0023] A gas preheater is also installed between the heating gas pipeline and coke oven 1, and the low-temperature output end of the riser heat exchanger is connected to the fuel input end of the gas preheater. The gas preheater can ensure the stability of the gas temperature entering the furnace, and by utilizing the waste heat carried by the raw gas to preheat the gas in the gas preheater, energy consumption can be reduced.

[0024] The raw material input end and solid phase output end of the coke oven 1 are respectively connected to the dust removal ground station via dust collection fans. The coke oven 1 is also equipped with a large dust collection hood. The flue gas generated during the coal charging and coke discharging process is drawn to the dust removal ground station for purification through the large dust collection hood and the fan, thereby reducing the degree of environmental pollution.

[0025] like Figure 2As shown, the riser heat exchanger includes an outer shell 2, a jacket 3, and an inner cylinder 4. The outer shell 2 is fitted onto the outside of the jacket 3, and the jacket 3 is fitted onto the outside of the inner cylinder 4. A low-temperature heat exchange channel 5 is formed between the jacket 3 and the inner cylinder 4, and the cavity of the inner cylinder 4 forms a high-temperature heat exchange channel 6. The riser heat exchanger is also provided with an inlet 7 and an outlet 8. Both the inlet 7 and the outlet 8 pass through the outer shell 2 and the jacket 3 and are connected to the low-temperature heat exchange channel 5. The inlet 7 forms the low-temperature side input end of the riser heat exchanger, and the outlet 8 forms the low-temperature side output end of the riser heat exchanger. The input end of the high-temperature heat exchange channel 6 forms the high-temperature side input end of the riser heat exchanger, and the output end of the high-temperature heat exchange channel 6 forms the high-temperature side output end of the riser heat exchanger. The inner cylinder 4 serves as a high-temperature heat exchange channel 6 for the flow of high-temperature raw coal gas, while the low-temperature heat exchange channel 5 between the jacket 3 and the inner cylinder 4 is used for the flow of the heat exchange medium. The outer shell 2 provides protection and insulation. This layered structure enables the heat of the raw coal gas to be efficiently transferred to the heat exchange medium, improving the waste heat recovery efficiency.

[0026] The pipe at the gas phase output end of the coke oven 1 is inclinedly connected to the inner cylinder 4 of the riser heat exchanger. The raw coal gas output from the coke oven 1 is introduced into the high-temperature heat exchange channel 6 in an upward inclined direction. This upward inclined introduction method can, on the one hand, slow down the flow rate of the raw coal gas, allowing it to stay in the high-temperature heat exchange channel 6 for a longer time, thus having more time to exchange heat with the inner cylinder 4 wall and improving the heat exchange effect; on the other hand, this inclined method helps impurity particles in the raw coal gas to settle naturally under the action of gravity, reducing the blockage of the heat exchanger by impurities and extending the service life of the heat exchanger.

[0027] The inner wall of the inner cylinder 4 is provided with spiral corrugated guide grooves 9, which allow the raw coal gas to rise spirally within the high-temperature heat exchange channel 6. This spiral flow pattern significantly increases the contact area and contact time between the raw coal gas and the inner cylinder 4 wall, further improving heat exchange efficiency. Simultaneously, the spiral flow also provides a certain degree of stirring, making the heat distribution in the raw coal gas more uniform and facilitating more thorough heat transfer to the heat exchange medium.

Claims

1. An energy-saving and emission-reducing coking system, comprising a coke oven (1), a quenching tower, a coke storage unit, a bridge pipe, and a gas purification workshop, wherein the raw material input end of the coke oven (1) is connected to the output end of the coal preparation unit, the fuel input end of the coke oven (1) is connected to the output end of the heating gas pipeline, the solid phase output end of the coke oven (1) is connected to the input end of the quenching tower, the output end of the quenching tower is connected to the coke storage unit, and the gas phase output end of the coke oven (1) is connected to the gas purification workshop via a bridge pipe, characterized in that, A riser heat exchanger is also provided between the gas phase output end of the coke oven (1) and the bridge tube. The high temperature side input end of the riser heat exchanger is connected to the gas phase output end of the coke oven (1), the high temperature side output end of the riser heat exchanger is connected to the bridge tube, the low temperature side input end of the riser heat exchanger is connected to the output end of the heat exchange medium, and the low temperature side output end of the riser heat exchanger is connected to the heat recovery unit.

2. The energy-saving and emission-reducing coking system according to claim 1, characterized in that, A gas preheater is also provided between the heating gas pipeline and the coke oven (1), and the low-temperature output end of the riser heat exchanger is also connected to the fuel input end of the gas preheater.

3. The energy-saving and emission-reducing coking system according to claim 1, characterized in that, The raw material input end and solid phase output end of the coke oven (1) are respectively connected to the dust removal ground station via a dust collection fan.

4. The energy-saving and emission-reducing coking system according to claim 1, characterized in that, The riser heat exchanger includes an outer shell (2), a jacket (3), and an inner cylinder (4). The outer shell (2) is fitted onto the outside of the jacket (3), and the jacket (3) is fitted onto the outside of the inner cylinder (4). A low-temperature heat exchange channel (5) is formed between the jacket (3) and the inner cylinder (4). The cavity of the inner cylinder (4) forms a high-temperature heat exchange channel (6). The riser heat exchanger is also provided with an inlet (7) and an outlet (8). The inlet (7) and the outlet (8) both pass through the outer shell (2) and the jacket (3) and are connected to the low-temperature heat exchange channel (5). The inlet (7) forms the low-temperature side input end of the riser heat exchanger, and the outlet (8) forms the low-temperature side output end of the riser heat exchanger. The input end of the high-temperature heat exchange channel (6) forms the high-temperature side input end of the riser heat exchanger, and the output end of the high-temperature heat exchange channel (6) forms the high-temperature side output end of the riser heat exchanger.

5. The energy-saving and emission-reducing coking system according to claim 4, characterized in that, The gas phase output pipe of the coke oven (1) is inclinedly connected to the inner cylinder (4) of the riser heat exchanger, and the raw coal gas output from the coke oven (1) is introduced into the high temperature heat exchange channel (6) in an inclined upward direction.

6. The energy-saving and emission-reducing coking system according to claim 5, characterized in that, The inner wall of the inner cylinder (4) is provided with a spiral corrugated guide groove (9), and the raw coal gas rises in a spiral shape in the high temperature heat exchange channel (6) with the help of the guide groove (9).

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