Novel process device of dry quenching system

Abstract

The invention relates to a novel process device of a dry quenching system, which comprises a red coke transporting and loading system, a heat exchange system, a discharging system, a circulating system and a circulating gas desulfurization and decarburization system, and is characterized in that the red coke transporting and loading system comprises a red coke transporting and loading device and a dry quenching furnace (3); the red coke conveying device is driven by an electric locomotive (20) through a rail to drag a first coke tank car (21) and a second coke tank car (22) to a red coke lifting position, the circulating gas desulfurization and decarburization system comprises a waste heat boiler (11) and a powder storage bin (6), and a dry desulfurization storage agent bin (13) is inserted and connected into a communicating pipeline of the waste heat boiler (11) and a pre-deduster (14) so as to add a dry desulfurization storage agent. The novel process device of the dry quenching system has the advantages of reducing the carbon solution loss of coke, improving the heat exchange efficiency of inert gas and greatly reducing the pollution of dust-containing and sulfur-containing gas to the environment.

Description

Technical Field

[0001] The present invention relates to a coke dry quenching system, and more particularly to a new process device for a coke dry quenching system. Background Art

[0002] In coke dry quenching, an inert circulating gas is used as a heat carrier. Under the action of a circulating fan, it flows countercurrently with red coke in a coke dry quenching furnace. The inert circulating gas is fed into the cooling chamber of the coke dry quenching furnace from the bottom gas supply device, undergoes countercurrent heat exchange with the red-hot coke, and then flows out through the inclined channels and the annular air duct. The high-temperature inert circulating gas is preliminarily dust-removed by a primary dust collector, the waste heat is recovered by a waste heat boiler, and further dust-removed by a secondary dust collector. Then, it is sucked by the circulating fan, preheats the demineralized water through a heat pipe heat exchanger, and is sent back to the bottom of the coke dry quenching furnace, completing one heat exchange cycle of the inert gas.

[0003] After circulation, the coke dry quenching system contains a large amount of sulfur-based compounds and CO 2 , and generally, the components of the designed circulating gas for coke dry quenching are: CO 2 content 10% - 20%, CO < 8%, H 2 < 3%, O 2 < 0.1%, and the rest is N 2 .

[0004] In the circulating system in the coke dry quenching furnace, CO 2 reacts with red coke to form combustible gas CO in the high-temperature zone, causing coke loss, directly increasing the coke powder rate, indirectly affecting the color and quality of coke, and affecting indicators such as the energy consumption standard and low-carbon production in the coking process. The reaction principle is C + CO 2 = 2CO. CO in the circulating gas 2 causes a large amount of coke burning loss in the high-temperature zone. To ensure the safe, normal, and efficient operation of the coke dry quenching circulation cooling process, N 2 is continuously supplemented in the high-temperature circulating gas during production operation, and air is introduced for combustion to reduce the concentrations of H 2 and CO and some remaining CH 4 . To maintain the balance state of the circulating system, 10% - 20% of the circulating gas is discharged through the fan outlet. The discharge of the circulating gas directly causes an increase in the power consumption of the circulating fan, heat loss, emissions of pollutants such as SO 2 and CO 2 , and emissions of combustible gases such as CO and H 2 and CH 4 , and an increase in the supplement amount of inert N 2 . Repeating this cycle causes energy waste and environmental pollution, violating the principle of promoting green and low-carbon enterprise development in China.

[0005] Removal of CO from the coke dry quenching circulating gas 2After the gas, the carbon solution loss of the coke will be greatly reduced; while the content of the inert gas N used for dry coke quenching does not decrease, so the power consumption of the circulation fan can be greatly reduced; the amount of supplementary air is very small, reducing the gas emission amount, and greatly reducing the pollution of the dust-containing and sulfur-containing gases to the environment; reducing the scale of the environmental dust removal ground, the construction costs of pipelines, equipment, etc., and the energy consumption of the dust removal fan. The collected CO 2 has a very wide range of resource utilization in the raw material gas market. 2 The high-sulfur flue gas generated by the coke discharging device needs to enter the high-sulfur dust removal system for treatment, which is not only far in transportation but also has a large load.

[0006] Therefore, the known dry coke quenching system process device has the above-mentioned various inconveniences and problems.

[0007] Summary of the Invention The purpose of the present invention is to provide a new process device for a safe and reliable dry coke quenching system.

[0008] To achieve the above purpose, the technical solution of the present invention is:

[0009] A new process device for a dry coke quenching system, including red coke transportation, charging system, heat exchange system, discharging system, circulation system, circulating gas desulfurization and decarbonization system, characterized in that: The red coke transportation and charging system includes red coke transportation, charging device, and dry coke quenching furnace. The red coke transportation device is driven by a motor vehicle (20) through a track to tow the first coke pot car and the second coke pot car to the red coke lifting position. A coke guide machine cooperating with the motor vehicle is provided at the red coke lifting position, and a hoist is provided above the red coke lifting position. The hoist can run up and down to convey the red coke into the charging device; the dry coke quenching furnace is arranged beside the hoist, and the upper opening of the dry coke quenching furnace is matched with the lower opening of the charging device to receive the red coke for charging. A supplementary air inlet and a circulating gas outlet are provided at the upper part of the dry coke quenching furnace to connect with the circulating gas primary dust collector. A coke discharging port is provided at the bottom of the dry coke quenching furnace, and the coke discharging port is matched with the lower coke discharging system, and the coke discharging system is connected with the coke storage system. A circulating gas inlet is provided above the coke discharging port, and the circulating gas is provided by a circulating fan arranged outside the dry coke quenching furnace; the charging device is communicated with the environmental ground dust removal station arranged beside it, and the environmental ground dust removal station is provided with a qualified gas discharge port; The circulating gas desulfurization and decarbonization system includes a waste heat boiler and a powder storage bin. The circulating gas extracted from the primary dust collector is communicated with the waste heat boiler. A steam pipeline is provided at the top of the waste heat boiler to communicate with the steam turbine house for power generation; the bottom of the waste heat boiler is communicated with a pre-dust collector, and the lower part of the pre-dust collector is communicated with a secondary dust collector. The secondary dust collector is sequentially communicated with a heat pipe heat exchanger, a multi-stage heat exchanger, a decarbonization absorption tower and a circulating fan through pipelines; Among them: A dry desulfurization agent storage bin is inserted and connected in the pipeline connecting the waste heat boiler and the pre-dust collector so as to add dry desulfurization agent.

[0010] The new process device of the coke dry quenching system of the present invention can also be further realized by adopting the following technical measures.

[0011] For the aforementioned new process device of the coke dry quenching system, a demineralized water inlet pipe and a deaerator are provided in the heat pipe heat exchanger, and steam is introduced into the deaerator.

[0012] For the aforementioned new process device of the coke dry quenching system, a cooling water inlet and an outlet for the water after heat exchange are provided in the multi-stage heat exchanger.

[0013] For the aforementioned new process device of the coke dry quenching system, the decarbonization absorption tower removes carbon dioxide from the circulating gas that enters the stripping and regeneration tower through the heat pipe heat exchanger by a chemical absorption method for decarbonization system, for removing CO 2 , removing CO 2 The circulating gas is re-introduced into the coke dry quenching furnace through the circulating fan.

[0014] After adopting the above technical solutions, the new process device of the coke dry quenching system of the present invention has the following advantages: 1. Reduce the loss of carbon solution of coke; 2. Improve the heat exchange efficiency of the inert gas; 3. Greatly reduce the pollution of the dust-containing and sulfur-containing gas to the environment. Description of the Drawings

[0015] Figure 1 It is a schematic configuration diagram of the new process device of the coke dry quenching system according to the embodiment of the present invention.

[0016] In the figure: 1 hoist, 2 charging device, 3 coke dry quenching furnace, 4 environmental ground dust removal station, 5 primary dust collector, 6 powder storage bin, 7 circulating fan, 8 decarbonization absorption tower, 9 multi-stage heat exchanger, 10 heat pipe heat exchanger, 11 waste heat boiler, 12 steam turbine house, 13 dry desulfurization agent storage bin, 14 pre-dust collector, 15 secondary dust collector, 16 deaerator, 17 stripping and regeneration tower, 18 coke storage system, 19 coke discharging system, 20 locomotive, 21 coke pot car, 22 coke pot car, 23 coke guide machine. Detailed Embodiments

[0017] The present invention will be further described in detail below in conjunction with the embodiments and their accompanying drawings.

[0018] Embodiment 1 The new process device of the coke dry quenching system of the present invention includes red coke transportation, charging system, circulating gas desulfurization and decarbonization system.

[0019] Now please refer to Figure 1 ,Figure 1 This is a schematic configuration diagram of a new process device for a coke dry quenching system according to an embodiment of the present invention. As shown in the figure, the red coke transportation and charging system includes a red coke transportation and charging device and a coke dry quenching furnace 3. The red coke transportation device is driven by a motor vehicle 20 through a track to tow a first coke pot car 21 and a second coke pot car 22 to the red coke lifting position. A coke guide machine 23 cooperating with the motor vehicle is provided at the red coke lifting position. A hoist 1 is provided above the red coke lifting position. The hoist can move up and down to convey the red coke into the charging device 2. The coke dry quenching furnace 3 is arranged beside the hoist. The upper opening of the coke dry quenching furnace is matched with the lower opening of the charging device to receive the charging of red coke. A supplementary air inlet and a circulating gas outlet are provided at the upper part of the coke dry quenching furnace, leading to a primary dust collector 5 for the circulating gas. A coke discharging port is provided at the bottom of the coke dry quenching furnace. The coke discharging port is matched with the lower coke discharging system 19 below, and the coke discharging system is connected to a coke storage system 18. A circulating gas inlet is provided above the coke discharging port. The circulating gas is provided by a circulating fan 7 arranged outside the coke dry quenching furnace. The charging device 2 is communicated with an environmental ground dust removal station 4 arranged beside. The environmental ground dust removal station is provided with a qualified gas discharge port.

[0020] The circulating gas desulfurization and decarbonization system includes a waste heat boiler 11 and a powder storage bin 6. The circulating gas extracted from the primary dust collector 5 is communicated with the waste heat boiler 11. A steam pipeline is provided at the top of the waste heat boiler to be communicated with a turbine house 12 for power generation. The bottom of the waste heat boiler is communicated with a pre-dust collector 14. The pre-dust collector 14 is communicated with a secondary dust collector 15 below. The secondary dust collector is sequentially communicated with a heat pipe heat exchanger 10, a multi-stage heat exchanger 9, a decarbonization absorption tower 8 and a circulating fan 7 through pipelines. Among them: A dry desulfurization agent storage bin 13 is inserted and connected in the pipeline connecting the waste heat boiler 11 and the pre-dust collector 14 to facilitate the addition of dry desulfurization agent. The heat pipe heat exchanger 10 is provided with a demineralized water inlet pipe and a deaerator 16, and steam is introduced into the deaerator. The multi-stage heat exchanger 9 is provided with a cooling water inlet and a heat exchange water discharge outlet. The decarbonization absorption tower 8 removes carbon dioxide from the circulating gas entering the regeneration tower 17 through a chemical absorption method for decarbonization system, for removing CO 2 in the circulating gas. 2 The circulating gas after removing CO is introduced into the coke dry quenching furnace again through the circulating fan.

[0021] Embodiment 2 The usage method of the new process device of the coke dry quenching system of the present invention: The red coke charged into the coke dry quenching furnace through the red coke transportation system, lifting system and charging device exchanges heat with the inert gas blown in by the circulation fan in the coke dry quenching furnace and then enters the primary dust collector. After passing through the primary dust collector, the circulating gas exchanges heat with the coke dry quenching waste heat boiler, and the generated steam is sent to the steam turbine for power generation or externally supplied. The cooled circulating gas is mixed with the high-sulfur flue gas generated by the coke discharging device, and reacts with the Ca-based powder sprayed into the pipeline between the boiler and the pre-dust collector and the secondary dust collector by the Ca-based dry desulfurization device for desulfurization reaction. The reacted circulating gas passes through the pre-dust collector to remove the large coke powder brought by the flue gas at the coke discharging device and then passes through the secondary dust collector for dust removal again. The dusted powder is discharged into the powder storage bin for external transportation. The desulfurized gas preheats the deaerator feed water through the heat pipe heat exchanger, and then exchanges heat through the multi-stage combined heat exchanger to cool down to the temperature required for decarbonization. The circulating gas that meets the requirements enters the decarbonization absorption tower and undergoes a chemical absorption reaction with the absorbent flowing from top to bottom to remove carbon, and then passes through the regeneration tower for CO 2 After post-treatment by analysis, the decarbonized circulating gas enters the circulation fan, and the circulation fan sends the circulating gas into the coke dry quenching furnace again. This process mainly sends the high-sulfur gas generated by the coke discharging device into the coke dry quenching circulating gas pipeline for desulfurization, and removes the sulfur-based substances and CO in the circulating gas through the dry desulfurization system and the chemical absorption decarbonization system 2 .

[0022] The present invention has substantial features and remarkable technical progress. The new process device of the coke dry quenching system of the present invention is an improvement on the traditional coke dry quenching system process device, which adds a circulating gas desulfurization and decarbonization system. The red coke charged into the coke dry quenching furnace through the red coke transportation system, lifting system and charging device exchanges heat with the inert gas blown in by the circulation fan in the coke dry quenching furnace and then enters the primary dust collector. After passing through the primary dust collector, the circulating gas exchanges heat with the coke dry quenching waste heat boiler, and the generated steam is sent to the steam turbine for power generation or externally supplied. The cooled circulating gas is mixed with the high-sulfur flue gas generated by the coke discharging device, and reacts with the Ca-based powder sprayed into the pipeline between the boiler and the pre-dust collector and the secondary dust collector by the Ca-based dry desulfurization device for desulfurization reaction. The reacted circulating gas passes through the pre-dust collector to remove the large coke powder brought by the flue gas at the coke discharging device and then passes through the secondary dust collector for dust removal again. The dusted powder is discharged into the powder storage bin for external transportation. The desulfurized gas preheats the deaerator feed water through the heat pipe heat exchanger, and then exchanges heat through the multi-stage combined heat exchanger to cool down to the temperature required for decarbonization. The circulating gas that meets the requirements enters the decarbonization absorption tower and undergoes a chemical absorption reaction with the absorbent flowing from top to bottom to remove carbon, and then passes through the regeneration tower for CO 2After analytical post-treatment, the decarbonized circulating gas enters the circulating fan, and the circulating fan sends the circulating gas back into the coke dry quenching furnace. This process mainly sends the high-sulfur gas generated by the coke discharging device into the coke dry quenching circulating gas pipeline for desulfurization, and removes the sulfur-based substances and CO in the circulating gas through the dry desulfurization system and the chemical absorption decarbonization system. 2， The high-sulfur gas transported back to the coke dry quenching circulating system does not need to be discharged externally after its own desulfurization, which also reduces gas waste. It also solves the problem of desulfurizing the high-sulfur flue gas generated by the coke discharging device and the high-sulfur flue gas discharged after the fan in the high-sulfur dust removal system, and solves the problems of desulfurization and decarbonization in the circulating gas. This reduces the carbon dissolution loss of coke, reduces the supplementary amount of inert gas and improves the heat exchange efficiency of inert gas, cancels the conventional discharge amount of circulating gas, and the discharge pipeline after the fan in the invention is only reserved for discharging in case of accidents, greatly reducing the pollution of dust-containing and sulfur-containing gases to the environment. The power consumption of the circulating fan can also be greatly reduced, and the scale of equipment such as environmental dust removal on the ground can be reduced. The new process device of the coke dry quenching system of the present invention solves the problem of desulfurizing the high-sulfur flue gas generated by the coke discharging device and the high-sulfur flue gas discharged after the fan in the high-sulfur dust removal system, and solves the problems of desulfurization and decarbonization in the circulating gas. This reduces the carbon dissolution loss of coke, reduces the supplementary amount of inert gas and improves the heat exchange efficiency of inert gas, cancels the conventional discharge amount of circulating gas, and the discharge pipeline after the fan in the invention is only reserved for discharging in case of accidents, greatly reducing the pollution of dust-containing and sulfur-containing gases to the environment. The power consumption of the circulating fan can also be greatly reduced, and the scale of equipment such as environmental dust removal on the ground can be reduced. At the same time, it implements the technological innovation of the "Implementation Plan for Carbon Dioxide Peaking in the Industrial Sector" in China, promotes an effective way for industrial enterprises to implement systematic clean production such as energy conservation, desulfurization, and carbon reduction, and is also an important guarantee for technical cooperation in the recycling of carbon dioxide and other technologies.

[0023] The above embodiments are only for illustrating the present invention, rather than limiting the present invention. Those skilled in the relevant technical fields can make various transformations or changes without departing from the spirit and scope of the present invention. Therefore, all equivalent technical solutions should also fall within the scope of the present invention and should be defined by each claim.

Claims

1. A new process device for a coke dry quenching system, comprising a red coke transportation and loading system, a heat exchange system, a discharge system, a circulation system, and a circulating gas desulfurization and decarbonization system, characterized in that: The red coke transport and loading system comprises a red coke transport and loading device and a dry quenching furnace (3). The red coke transport device is driven by an electric locomotive (20) via a track to pull a first coke tank car (21) and a second coke tank car (22) to a red coke lifting position. The red coke lifting position is provided with a coke intercepting machine (23) cooperating with the electric locomotive. An elevator (1) is provided above the red coke lifting position. The elevator can move up and down so as to transport the red coke into the loading device (2). The dry quenching furnace (3) is arranged beside the elevator. The upper opening of the dry quenching furnace cooperates with the lower opening of the loading device. , to receive the red coke, the upper part of the dry quenching furnace is provided with a supplementary air inlet and a circulating gas outlet, so that the circulating gas is a primary dust collector (5), the bottom of the dry quenching furnace is provided with a coke discharge port, the coke discharge port cooperates with the coke discharge system (19) below, and the coke discharge system is connected to the coke storage system (18), the coke discharge port is provided with a circulating gas inlet above the coke discharge port, and the circulating gas is provided by a circulating fan (7) arranged outside the dry quenching furnace; the loading device (2) is connected to the environmental ground dust removal station (4) arranged on the side, and the environmental ground dust removal station is provided with a qualified gas external discharge port; The circulating gas desulfurization and decarbonization system comprises a waste heat boiler (11) and a powder storage bin (6); the circulating gas extracted from the primary dust collector (5) is connected to the waste heat boiler (11); a steam pipeline is provided on the top of the waste heat boiler to connect to a steam turbine room (12) for power generation; the bottom of the waste heat boiler is connected to a pre-dust collector (14); the bottom of the pre-dust collector (14) is connected to a secondary dust collector (15); the secondary dust collector is connected to a heat pipe heat exchanger (10), a multi-stage heat exchanger (9), a decarbonization absorption tower (8) and a circulating fan (7) in sequence through pipelines; Wherein: a dry desulfurization agent storage bin (13) is inserted into the connecting pipeline between the waste heat boiler (11) and the pre-dust collector (14) to allow for the addition of dry desulfurization agent.

2. The novel process device for the dry quenching system according to claim 1, characterized in that: The heat pipe heat exchanger (10) is provided with a deionized water inlet pipe and a deaerator (16), and steam is introduced into the deaerator.

3. The novel process device for the dry quenching system according to claim 1, characterized in that: The multi-stage heat exchanger (9) is provided with a cooling water inlet and a heat exchanged water outlet.

4. The novel process device for dry coke quenching system according to claim 1, characterized in that: The decarbonization absorption tower (8) decarbonizes the circulating gas that passes through the heat pipe heat exchanger and enters the analytical regeneration tower (17) through a chemical absorption decarbonization system, so as to remove CO2 from the circulating gas. The circulating gas from which CO2 has been removed is introduced into the dry quenching furnace again through a circulating fan.

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