Solid-state treatment system for reducing gas consumption of pellet reduction furnace

Abstract

The utility model relates to the technical field of energy conservation and emission reduction in metallurgy, in particular to a solid-state treatment system for reducing gas consumption of a pellet reduction furnace. A gas inlet is formed in the bottom of the reduction heating electric furnace, and a CO inlet and an N2 inlet are formed in a gas inlet pipeline of the reduction heating electric furnace; a backflow gas inlet is formed in a gas inlet of the reduction heating electric furnace; the heat exchange type water cooling device is connected with a gas outlet of the reduction heating electric furnace; the hot air pump is connected with an air outlet of the heat exchange type water cooling device; the solid amine storage tank is connected with an air outlet of the hot air pump; a branch is arranged on a pipeline between the reduction heating electric furnace and the heat exchange type water cooling device; an exhaust valve, a CO detection sensor, an electronic ignition device and a safety valve are arranged on the branch; and a gas outlet of the solid amine storage tank is connected with the backflow gas inlet. Experiments show that the solid-state treatment system provided by the utility model is extremely low in gas consumption.

Description

Technical Field

[0001] The utility model relates to the technical field of metallurgical energy conservation and emission reduction, in particular to a solid-state processing system for reducing the gas consumption of a pellet reduction furnace. Background Art

[0002] Currently, the method for reducing metallized pellets in the laboratory is mostly to dry, roast, and cool the pellets externally before placing them in a reduction furnace for reduction to produce reduced metallized pellets. CO and N2 are introduced into the reduction furnace. The N2 removes air from the reactor and protects the stainless steel furnace walls. The CO reduces the iron oxides in the pellets to form metallic iron. During the reaction, the main reactant gas generated is CO2, and the waste gas is directly discharged into the air after combustion. The main reaction equation in the reduction furnace is as follows:

[0003] FeO+CO→Fe+CO2.

[0004] The exhaust gas from the reduction furnace contains a large amount of unreacted CO and N₂, resulting in a low gas utilization rate of less than 10%. Gas consumption is high for each experiment. CO and N₂ are shipped in cylinders. When the amount of pelletizing raw material increases significantly, gas consumption increases, requiring the transport of numerous cylinders. When the cylinders are low on gas, they must be switched. This places a high workload on the experimenters. Utility Model Content

[0005] In view of this, the technical problem to be solved by the present invention is to provide a solid-state treatment system for reducing the gas consumption of a pellet reduction furnace, with extremely low gas consumption.

[0006] The present application provides a solid-state treatment system for reducing gas consumption in a pellet reduction furnace, comprising:

[0007] A reduction heating furnace; an air inlet is provided at the bottom of the reduction heating furnace, and a CO inlet and a N2 inlet are provided on the air inlet pipe of the reduction heating furnace; a reflux gas inlet is provided at the air inlet of the reduction heating furnace;

[0008] a heat exchange water cooling device connected to the air outlet of the reduction heating electric furnace;

[0009] a hot air pump connected to the air outlet of the heat exchange water cooling device;

[0010] a solid amine storage tank connected to the air outlet of the hot air pump;

[0011] A branch line is provided on the pipeline between the reduction heating electric furnace and the heat exchange water cooling device; an exhaust valve, a CO detection sensor, an electronic ignition device and a safety valve are provided on the branch line;

[0012] The gas outlet of the solid amine storage tank is connected to the reflux gas inlet.

[0013] Preferably, the structure of the heat exchange water cooling device includes:

[0014] A screw-type water cooling device; the screw-type water cooling device is provided with an air inlet, an air outlet, a cold water inlet and a hot water outlet;

[0015] a screw-type water chiller connected to the hot water outlet of the screw-type water cooling device;

[0016] a water tank connected to the water outlet of the screw chiller;

[0017] A circulating water pump is connected to the water outlet of the water tank; the water outlet of the circulating water pump is connected to the cold water inlet of the screw-type water cooling device.

[0018] Preferably, a temperature detection sensor is provided on the pipeline between the hot air pump and the solid amine storage tank.

[0019] Preferably, a CO2 detection sensor is provided at the gas outlet of the solid amine storage tank.

[0020] Preferably, a second CO detection sensor is further provided at the gas outlet of the solid amine storage tank.

[0021] Preferably, the CO inlet on the air intake pipe is connected to a CO gas cylinder; the N2 inlet on the air intake pipe is connected to an N2 gas cylinder.

[0022] Preferably, a first one-way valve is provided on the air intake pipe after the CO inlet and the N2 inlet.

[0023] Preferably, the gas outlet of the solid amine storage tank is connected to the reflux gas inlet between the first one-way valve and the reduction heating furnace.

[0024] The present application provides a solid-state treatment system for reducing the gas consumption of a pelletizing reduction furnace, comprising: a reduction heating furnace; an air inlet provided at the bottom of the reduction heating furnace, a CO inlet and an N2 inlet provided on the air inlet pipe of the reduction heating furnace; a reflux gas inlet provided at the air inlet of the reduction heating furnace; a heat exchange water cooling device connected to the air outlet of the reduction heating furnace; a hot air pump connected to the air outlet of the heat exchange water cooling device; a solid amine storage tank connected to the air outlet of the hot air pump; a branch provided on the pipeline between the reduction heating furnace and the heat exchange water cooling device; an exhaust valve, a CO detection sensor, an electronic ignition device, and a safety valve provided on the branch; and the air outlet of the solid amine storage tank connected to the reflux gas inlet. The solid-state treatment system for reducing the gas consumption of a pelletizing reduction furnace provided by the present application is used in a laboratory. The entire pipeline operates in a closed loop and does not generate new impurities. It has ultra-low exhaust emissions during operation, meeting environmental protection requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A diagram of a solid-state processing system for reducing gas consumption in a pellet reduction furnace, provided in accordance with one embodiment of the present application. DETAILED DESCRIPTION

[0026] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0027] The present application provides a solid-state treatment system for reducing gas consumption in a pellet reduction furnace, comprising:

[0028] A reduction heating furnace; an air inlet is provided at the bottom of the reduction heating furnace, and a CO inlet and a N2 inlet are provided on the air inlet pipe of the reduction heating furnace; a reflux gas inlet is provided at the air inlet of the reduction heating furnace;

[0029] a heat exchange water cooling device connected to the air outlet of the reduction heating electric furnace;

[0030] a hot air pump connected to the air outlet of the heat exchange water cooling device;

[0031] a solid amine storage tank connected to the air outlet of the hot air pump;

[0032] A branch line is provided on the pipeline between the reduction heating electric furnace and the heat exchange water cooling device; an exhaust valve, a CO detection sensor, an electronic ignition device and a safety valve are provided on the branch line;

[0033] The gas outlet of the solid amine storage tank is connected to the reflux gas inlet.

[0034] Figure 1 A diagram of a solid-state treatment system for reducing gas consumption in a pellet reduction furnace, provided in accordance with one embodiment of the present application. Figures 1 represent a CO gas cylinder, 2 represent an N2 gas cylinder, 3 represent a first one-way valve, 4 represent a second one-way valve, 5 represent a reduction heating furnace, 6 represent pellets, 7 represent an exhaust valve, 8 represent a first CO detection sensor, 9 represent an electronic ignition device, 10 represent a safety valve, 11 represent a heat exchange water cooling device, 11-1 represent a screw water cooling device, 11-2 represent a screw chiller, 11-3 represent a water tank, 11-4 represent a circulating water pump, 12 represent a hot air pump, 13 represent a temperature detection sensor, 14 represent a solid amine storage tank, 15 represent a CO2 detection sensor, and 16 represent a second CO detection sensor.

[0035] An air inlet is provided at the bottom of the reduction heating furnace 5. A CO inlet and an N2 inlet are provided on the air inlet pipe of the reduction heating furnace 5. The CO inlet on the air inlet pipe is connected to a CO gas cylinder 1. The N2 inlet on the air inlet pipe is connected to an N2 gas cylinder 2.

[0036] A first one-way valve 3 is provided on the air intake pipe after the CO inlet and the N2 inlet. Specifically, the first one-way valve 3 is provided on the air intake pipe after the CO and N2 are mixed. The first one-way valve 3 can be a common one-way valve available on the market.

[0037] The reduction heating furnace 5 is filled with pelletized ore raw materials, the main component of which is FeO. The mass content of FeO in the pelletized ore raw materials is 30% to 50%. The reduction heating furnace 5 can be a common commercially available reduction heating furnace.

[0038] The reduction heating furnace 5 is used to heat the pellets to 850-950°C, for example, 900°C. During operation, CO and N2 are introduced into the reduction heating furnace 5 to perform a reduction reaction. N2 is used to remove air from the reduction heating furnace 5 and protect the stainless steel furnace wall. CO reduces the iron oxides in the pellets to form metallic iron. The main reaction formula is shown in formula (1):

[0039] FeO+CO→Fe+CO2 formula (1).

[0040] During the reduction reaction, the product gas generated is mainly CO2.

[0041] The exhaust gas generated by the reduction heating electric furnace 5 contains a large amount of unreacted CO and N2, with a volume content of ≤10%.

[0042] A reflux gas inlet is provided at the air inlet of the reduction heating furnace 5. Specifically, a reflux gas inlet is provided on the pipeline between the first one-way valve 3 and the reduction heating furnace 5.

[0043] A branch line is provided on the pipeline between the reduction heating furnace 5 and the heat exchange water cooling device 11; the branch line is provided with an exhaust valve 7, a first CO detection sensor 8, an electronic ignition device 9, and a safety valve 10. The present application does not impose any particular restrictions on the location of the exhaust valve 7, the first CO detection sensor 8, the electronic ignition device 9, and the safety valve 10.

[0044] The exhaust valve 7 is a common commercial exhaust valve. The first CO detection sensor 8 is a common commercial CO detection sensor. The electronic ignition device is a natural gas water heater electronic ignition device or a coal gas water heater electronic ignition device. The safety valve 10 is a common commercial safety valve.

[0045] The structure of the heat exchange water cooling device 11 is as follows Figure 1 Shown, including:

[0046] Screw-type water cooling device 11-1; the screw-type water cooling device is provided with an air inlet, an air outlet, a cold water inlet and a hot water outlet;

[0047] A screw chiller 11-2 connected to the hot water outlet of the screw water cooling device 11-1;

[0048] A water tank 11-3 connected to the water outlet of the screw chiller 11-2;

[0049] A circulating water pump 11 - 4 is connected to the water outlet of the water tank 11 - 3 ; the water outlet of the circulating water pump 11 - 4 is connected to the cold water inlet of the screw-type water cooling device 11 - 1 .

[0050] The screw water cooling device 11-1 is a water-cooled screw double-head chiller (brand: Shenzhen Chuangyi). The screw chiller 11-2 is a commonly available screw chiller. The water tank 11-3 and the circulating water pump 11-4 are commonly available.

[0051] The air inlet of the hot air pump 12 is connected to the air outlet of the heat exchange water cooling device. The hot air pump 12 is a vortex fan or a blower (brand: Quanfeng Environmental Protection Technology Co., Ltd.).

[0052] The air inlet of the solid amine storage tank 14 is connected to the air outlet of the hot air pump 12 .

[0053] A temperature detection sensor 13 is provided on the pipeline between the hot air pump 12 and the solid amine storage tank 14 .

[0054] The solid amine storage tank 14 is filled with solid amine for absorbing CO2.

[0055] The working principle of solid amine adsorbents mainly relies on the chemical reaction between the amino groups on their surface and carbon dioxide to form compounds such as carbamates, thereby achieving carbon dioxide capture. The reaction formula can be simplified as shown in formula (2):

[0056] R-NH2+CO2→R-NH-COOH.

[0057] A CO 2 detection sensor 15 and a second CO detection sensor 16 are provided at the gas outlet of the solid amine storage tank 14 .

[0058] The gas outlet of the solid amine storage tank 14 is connected to the pipeline at the gas inlet of the reduction heating furnace 5. Specifically, the gas outlet of the solid amine storage tank 14 is connected to the reflux gas inlet between the first one-way valve 3 and the reduction heating furnace 5.

[0059] The present application has no particular limitation on the structure and type of the solid amine storage tank 14 , as long as it can be used to store solid amine.

[0060] This application also provides a Figure 1 The operating steps of the solid state processing system shown include:

[0061] 1) Pelletized ore raw materials are added to the reduction heating electric furnace 5; the mass content of FeO in the pelletized ore raw materials is 30% to 50%; and the weight of the pelletized ore raw materials is 15 kg.

[0062] 2) Open N2 storage cylinder 2 to introduce N2, run hot air pump 12 to circulate the gas in the system, and then open exhaust valve 7 to exhaust the air in the system. After 5 minutes of ventilation, when the system equipment and pipelines are filled with N2, stop introducing N2 and close exhaust valve 7.

[0063] 3) Turn on the reduction heating furnace 5 and operate the water cooling system of the heat exchange water cooling device 11; heat the temperature inside the reduction heating furnace 5 to 900°C.

[0064] 4) Open the CO gas cylinder 1 and introduce the reducing agent CO. When the concentration indicated by the second CO detection sensor 16 at the outlet of the solid amine storage tank 14 exceeds the limit, stop replenishing the reducing agent CO. During the experimental operation, if the concentration falls below the lower limit, the reducing agent CO is automatically replenished during the reaction.

[0065] 5) The exhaust gas discharged from the reduction heating furnace 5 enters the heat exchange water cooling device 11, and the temperature is controlled at 10-50°C, which is conducive to the subsequent absorption of CO2 in the exhaust gas by solid amine.

[0066] 6) The second CO detection sensor 16 automatically detects the absorption effect. When the upper limit is exceeded, an automatic alarm is given and the CO supply is stopped.

[0067] 7) The hot air pump 12 is frequency-controlled. When the temperature detection sensor 13 detects that the exhaust gas temperature is too high, the circulation speed of the gas in the pipeline can be reduced.

[0068] 8) One charge of solid amine can meet the needs of three experiments. The absorption of CO2 by solid amine is a reversible reaction. The replaced solid amine can release the absorbed CO2 by heating and can be reused.

[0069] 9) The reduction reaction lasts for 3 hours. Turn off the reduction heating furnace 5 and open the exhaust valve 7. When the first CO detection sensor 8 detects CO emission, it automatically activates the electronic ignition device 9, burning the CO and venting it. After 25 minutes of nitrogen flow, the CO in the system is exhausted. Close all valves and equipment in sequence.

[0070] 10) After cooling, the prepared metal pellets are taken out from the reduction heating furnace 5 .

[0071] 11) The experiment is completed.

[0072] It has been tested that, compared with the technical solution of directly discharging the generated waste gas into the air after combustion, the solid-state treatment system for reducing the gas consumption of the pellet reduction furnace provided by the present application can achieve a gas-saving efficiency of more than 90%.

[0073] The solid-state treatment system for reducing the gas consumption of a pellet reduction furnace provided in the present application is applied in a laboratory, and the entire pipeline operates in a closed loop without generating new impurities.

[0074] Ultra-low exhaust emissions during operation meet environmental protection requirements.

[0075] A CO detection sensor is installed in the pipeline. When the CO level is lower than the lower limit, the reducing agent CO is automatically added during the reaction process.

[0076] A solid amine storage tank is used to circulate the carbon dioxide in the absorption system to maintain the forward progress of the reduction reaction.

[0077] The temperature of the waste gas after the reaction is relatively high. In order to improve the absorption effect, the waste gas is controlled within a certain temperature range by water cooling and heat exchange.

[0078] A CO2 detection sensor is set to automatically detect the absorption effect, and an automatic alarm will be given if the upper limit is exceeded.

[0079] Beneficial effects:

[0080] Due to the recycling method, CO reducing agent and N2 gas can be greatly saved, thus saving experimental costs;

[0081] Since gas consumption is greatly reduced, the labor intensity of carrying, replacing and caring for gas cylinders is reduced;

[0082] The system emits virtually no waste gas during operation. The absorption of CO2 by solid amine is a reversible reaction. Solid amine is reusable and meets environmental emission requirements.

[0083] The above description of the disclosed embodiments will enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A solid-state treatment system for reducing gas consumption in a pellet reduction furnace, characterized in that: include: A reduction heating furnace; an air inlet is provided at the bottom of the reduction heating furnace, and a CO inlet and a N2 inlet are provided on the air inlet pipe of the reduction heating furnace; a reflux gas inlet is provided at the air inlet of the reduction heating furnace; a heat exchange water cooling device connected to the air outlet of the reduction heating electric furnace; a hot air pump connected to the air outlet of the heat exchange water cooling device; a solid amine storage tank connected to the air outlet of the hot air pump; A branch line is provided on the pipeline between the reduction heating electric furnace and the heat exchange water cooling device; an exhaust valve, a CO detection sensor, an electronic ignition device and a safety valve are provided on the branch line; The gas outlet of the solid amine storage tank is connected to the reflux gas inlet.

2. The solid state processing system according to claim 1, wherein: The structure of the heat exchange water cooling device includes: A screw-type water cooling device; the screw-type water cooling device is provided with an air inlet, an air outlet, a cold water inlet and a hot water outlet; a screw-type water chiller connected to the hot water outlet of the screw-type water cooling device; a water tank connected to the water outlet of the screw chiller; A circulating water pump is connected to the water outlet of the water tank; the water outlet of the circulating water pump is connected to the cold water inlet of the screw-type water cooling device.

3. The solid state processing system according to claim 1, wherein: A temperature detection sensor is provided on the pipeline between the hot air pump and the solid amine storage tank.

4. The solid state processing system according to claim 1, wherein: A CO2 detection sensor is provided at the gas outlet of the solid amine storage tank.

5. The solid state processing system according to claim 1, wherein: A second CO detection sensor is also provided at the gas outlet of the solid amine storage tank.

6. The solid state processing system according to claim 1, wherein: The CO inlet on the air intake pipe is connected to the CO gas cylinder; the N2 inlet on the air intake pipe is connected to the N2 gas cylinder.

7. The solid state processing system according to claim 6, wherein: A first one-way valve is provided on the air intake pipe after the CO inlet and the N2 inlet.

8. The solid state processing system according to claim 7, wherein: The gas outlet of the solid amine storage tank is connected to the reflux gas inlet between the first one-way valve and the reduction heating electric furnace.

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