Semi-coke furnace tail gas waste heat utilization device

Abstract

The utility model discloses a semi-coke furnace tail gas waste heat utilization device which comprises a semi-coke furnace, a tubular heat exchanger, a high-temperature fan, an air fan, a coal gas fan, a pusher, a discharging machine and an air and coal gas mixer. The tubular heat exchanger is provided with a tube pass medium inlet, a shell pass medium inlet, a shell pass medium outlet and a tube pass medium outlet, the semi-coke furnace cooling section is communicated with the tube pass medium inlet through a high-temperature gas pipeline, the shell pass medium inlet is connected with a normal-temperature air pipeline, and the tube pass medium outlet is connected with a cooling gas pipeline. The other end of the cooling gas pipeline extends to the position of a discharging machine, the shell pass medium outlet is communicated with an air-gas mixer through a dehydration air pipeline, and the air-gas mixer is connected with a gas pipeline and located in a hearth of the semi-coke furnace. According to the utility model, redundant heat in the production process of the semi-coke furnace is recycled through the tubular heat exchanger, so that energy conservation, consumption reduction, stable production and environmental protection are realized.

Description

Technical Field

[0001] The utility model relates to the field of reasonable development and utilization of kiln waste heat, and in particular to a device for utilizing waste heat from tail gas of a semi-coke furnace. Background Art

[0002] As a new type of carbon material, semi-coke is mostly used in metallurgical industries such as blast furnace ironmaking and casting. Its quality is better than many national standards for special coke. Therefore, semi-coke has higher application value in improving the quality of downstream products, saving energy, reducing production costs, and increasing output. At present, semi-coke production is mainly based on low-temperature distillation, and the distillation temperature is generally around 600℃. At present, the process of producing semi-coke is not yet mature, and there are still many problems as follows.

[0003] During the production process of the semi-coke furnace, a lot of 200-300℃ exhaust gas will be generated. These exhaust gases are discharged into the air through the exhaust pipe of the semi-coke furnace, which will waste a lot of heat. At the same time, these greenhouse gases will aggravate the trend of global warming. This kind of climate warming will cause the temperature to rise, affecting the living conditions of humans and ecosystems, and is not in line with the concept of energy conservation and consumption reduction, green and sustainable development.

[0004] The temperature inside the semi-coke furnace during production directly affects the quality of the semi-coke. At present, due to the different temperatures and humidity in the four seasons, the moisture content in the air is different. This normal temperature air with different moisture content directly enters the furnace, causing the semi-coke furnace to have large temperature fluctuations, difficult operation and control, much material waste, and poor product quality. During the semi-coke production process, the temperature of the discharge material is too high, which can easily burn the conveying equipment, resulting in more maintenance time, low output, high expenses, and high costs. Summary of the invention

[0005] In order to solve the above technical problems, the utility model provides a device for utilizing waste heat of tail gas from a blue charcoal furnace, which comprises: a blue charcoal furnace, a tubular heat exchanger, a high-temperature fan, an air fan, a gas fan, a pusher, a discharging machine and an air-gas mixer;

[0006] The blue charcoal furnace comprises a furnace and a blue charcoal furnace cooling section, and the tubular heat exchanger has a tube-side medium inlet, a shell-side medium inlet, a shell-side medium outlet and a tube-side medium outlet;

[0007] The cooling section of the semi-coke furnace is connected to the tube-side medium inlet through a high-temperature gas pipeline, the high-temperature fan is arranged on the high-temperature gas pipeline, the shell-side medium inlet is connected to a normal-temperature air pipeline, the air fan is arranged on the normal-temperature air pipeline, the tube-side medium outlet is connected to the cooling gas pipeline, the other end of the cooling gas pipeline extends to the discharge machine position, the shell-side medium outlet is connected to the air-gas mixer through a dehydration air pipeline, the air-gas mixer is connected to the gas pipeline, the gas fan is arranged on the gas pipeline, and the air-gas mixer is located in the furnace of the semi-coke furnace.

[0008] As a further description of the utility model, a plurality of air-gas mixers are arranged side by side at the bottom of the furnace of the blue charcoal furnace.

[0009] As a further description of the utility model, the cooling section of the blue charcoal furnace is arranged at the bottom of the blue charcoal furnace, the discharge machine is arranged at the bottom of the cooling section of the blue charcoal furnace, and a pusher is provided on one side of the cooling section of the blue charcoal furnace.

[0010] As a further description of the utility model, the tubular heat exchanger also includes a water collecting tank and a slag cleaning port.

[0011] As a further description of the utility model, the discharging machine also includes a discharger.

[0012] Compared with the prior art, the beneficial effects of the utility model are:

[0013] 1. The utility model utilizes the excess heat in the production process of the blue charcoal furnace through a tubular heat exchanger for recycling, thereby achieving energy saving and consumption reduction, stable production, and green environmental protection.

[0014] 2. The waste heat gas from the semi-coke furnace of the utility model heats the air through a tubular heat exchanger and dehydrates it, thus solving the problem of the moisture content of the air entering the semi-coke furnace during rain, snow and different seasons.

[0015] 3. The utility model uses the cooled gas (less than 80°C) to cool the blue charcoal at the bottom of the blue charcoal furnace, solving the problem that the blue charcoal outlet temperature at the bottom of the blue charcoal furnace is high and the equipment for conveying blue charcoal is easily damaged. Thus, the blue charcoal furnace can be produced and operated stably for a long time, and the design is reasonable, the structure is simple, and the utilization rate is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a process flow chart of the utility model;

[0017] Figure 2 It is a structural schematic diagram of the utility model.

[0018] In the figure: 1. Semi-coke furnace; 101. Furnace; 102. Semi-coke furnace cooling section; 2. Tubular heat exchanger; 201. Tube-side medium inlet; 202. Shell-side medium inlet; 203. Shell-side medium outlet; 204. Tube-side medium outlet; 205. Sump; 206. Slag removal port; 3. High-temperature fan; 4. Air fan; 5. Gas fan; 6. Pusher; 7. Discharger; 701. Unloader; 8. Air-gas mixer; 9. Dehydration air duct; 10. Gas duct; 11. High-temperature gas duct; 12. Cooling gas duct; 13. Normal-temperature air duct. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solutions and advantages of the utility model clearer, the utility model will be further described in detail below with reference to the accompanying drawings.

[0020] See also Figure 1-2 As shown in the figure, in the embodiment of the present invention, a blue charcoal furnace 1, a tubular heat exchanger 2, a high temperature fan 3, an air fan 4, a gas fan 5, a pusher 6, a discharging machine 7 and an air-gas mixer 8 are included. The blue charcoal furnace 1 includes a furnace 101 and a blue charcoal furnace cooling section 102. The tubular heat exchanger 2 has a tube-side medium inlet 201, a shell-side medium inlet 202, a shell-side medium outlet 203 and a tube-side medium outlet 204.

[0021] The cooling section 102 of the semi-coke furnace is connected to the tube-side medium inlet 201 through a high-temperature gas pipeline 11, the high-temperature fan 3 is arranged on the high-temperature gas pipeline 11, the shell-side medium inlet 202 is connected to a normal temperature air pipeline 13, the air fan 4 is arranged on the normal temperature air pipeline 13, the tube-side medium outlet 204 is connected to the cooling gas pipeline 12, and the other end of the cooling gas pipeline 12 extends to the position of the discharger 7, the shell-side medium outlet 203 is connected to the air-gas mixer 8 through a dehydration air pipeline 9, the air-gas mixer 8 is connected to the gas pipeline 10, the gas fan 5 is arranged on the gas pipeline 10, and the air-gas mixer 8 is located in the furnace 101 of the semi-coke furnace 1.

[0022] The tail gas at the bottom of the semi-coal furnace 1 is generated with a temperature of 200-300℃. The waste heat is pressurized by the high-temperature fan 3 and enters the tubes of the tubular heat exchanger 2. The normal temperature air is pressurized by the air fan and enters the outside of the tubes of the tubular heat exchanger 2. The normal temperature air is dehydrated after the tube heat exchange in the heat exchanger. The dehydrated air enters the air-gas mixer and mixes with the purified gas. After the two gases are well proportioned, they enter the semi-coal furnace 1 to adjust the furnace temperature and ensure the safe and stable production of the semi-coal furnace 1. At the same time, the cooled gas is sent from the outlet of the tubes of the tubular heat exchanger 2 to the position of the discharge machine 7 at the bottom of the semi-coal furnace 1 to cool the semi-coal and ensure the long-term stable operation of the semi-coal transportation equipment.

[0023] Preferably, a plurality of air-gas mixers 8 are arranged side by side at the bottom of the furnace 101 of the blue charcoal furnace 1 .

[0024] The utility model adopts a plurality of air-gas mixers 8, each of which is connected to a dehydration air pipeline 9 and a gas pipeline 10. Each air-gas mixer 8 works independently to evenly adjust the temperature of the semi-coke furnace 1, thereby ensuring the stable quality of the semi-coke produced.

[0025] Preferably, the blue charcoal furnace cooling section 102 is arranged at the bottom of the blue charcoal furnace 1, and a pusher 6 is provided on one side of the blue charcoal furnace cooling section 102, and a discharger 7 is provided on the other side.

[0026] The outlet of the semi-coke produced by the semi-coke furnace 1 of the utility model is located at the bottom of the semi-coke furnace 1, and the pusher 6 pushes the semi-coke at the bottom of the semi-coke furnace 1 into the discharger 7 at the bottom of the semi-coke furnace 1, and the discharger 7 transports the semi-coke from the bottom of the semi-coke furnace 1 to the conveying equipment outside the semi-coke furnace 1.

[0027] Preferably, the tubular heat exchanger 2 further includes a water collecting tank 205 and a slag cleaning port 206 .

[0028] The moisture in the high-temperature gas generates condensed water after heat exchange, and the condensed water enters the water collecting tank 205 for unified treatment. The solid in the high-temperature gas enters the bottom of the tubular heat exchanger 2 after cooling, and is regularly cleaned from the slag cleaning port 206.

[0029] Preferably, the discharging machine 7 also includes a discharger 701.

[0030] The discharger 701 of the utility model loads the semi-coke on the discharging machine 7 onto the transport equipment, so that the whole production process is fully automated and manpower is reduced.

[0031] The working principle of the utility model is that during the production of blue charcoal by the blue charcoal furnace 1, the bottom of the blue charcoal furnace 1 generates waste heat of 200-300℃ of tail gas. These high-temperature gases are pressurized by the high-temperature fan 3 and enter the tubes of the tube heat exchanger 2 from the tube-side medium inlet 201 of the tube heat exchanger 2 through the high-temperature gas pipeline 11. At the same time, the air fan 4 is used to apply pressure to the normal-temperature air outside the furnace. The normal-temperature air enters the outside of the tube heat exchanger 2 through the normal-temperature air pipeline 13 from the shell-side medium inlet 202 of the tube heat exchanger 2. The tube heat exchanger 2 exchanges heat with the high-temperature gas and the normal-temperature air. At this time, the normal-temperature air is dehydrated and the high-temperature gas is cooled. The dehydrated normal-temperature air enters the air-gas mixer 8 through the dehydration air pipeline 9 to mix with the coal gas. The cooled gas passes through the cooling gas pipeline 12 to cool the produced blue charcoal.

[0032] The utility model heats the air and dehydrates it through the tubular heat exchanger 2, thus solving the problem of the high and low moisture content of the air entering the blue charcoal furnace during rain, snow and different seasons. At the same time, the blue charcoal at the bottom of the blue charcoal furnace is cooled by the gas after cooling (less than 80°C), thus solving the problem of high blue charcoal outlet temperature at the bottom of the blue charcoal furnace, which is easy to damage the equipment for transporting blue charcoal. Thus, the blue charcoal furnace can be produced and operated stably for a long time, and its design is reasonable, the structure is simple and the utilization rate is high. The excess heat in the production process of the blue charcoal furnace is recycled to achieve energy saving and consumption reduction, stable production and green environmental protection.

[0033] The directions and positions mentioned in the present invention, such as "upper", "lower", "front", "back", "left", "right", "inside", "outside", "top", "bottom", "side", etc., are only for reference to the directions or positions of the drawings. Therefore, the directions and positions used are used to explain and understand the present invention, but not to limit the scope of protection of the present invention.

[0034] What is described above is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent substitutions or changes within the technical scope disclosed by the present invention according to the technical solution and inventive concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A device for utilizing waste heat from tail gas of a blue charcoal furnace, characterized in that: Including blue charcoal furnace, tubular heat exchanger, high temperature fan, air fan, gas fan, pusher, discharging machine and air-gas mixer; The blue charcoal furnace comprises a furnace and a blue charcoal furnace cooling section, and the tubular heat exchanger has a tube-side medium inlet, a tube-side medium outlet, a shell-side medium inlet and a shell-side medium outlet; The cooling section of the semi-coke furnace is connected to the tube-side medium inlet through a high-temperature gas pipeline, the high-temperature fan is arranged on the high-temperature gas pipeline, the shell-side medium inlet is connected to a normal-temperature air pipeline, the air fan is arranged on the normal-temperature air pipeline, the tube-side medium outlet is connected to the cooling gas pipeline, the other end of the cooling gas pipeline extends to the discharge machine position, the shell-side medium outlet is connected to the air-gas mixer through a dehydration air pipeline, the air-gas mixer is connected to the gas pipeline, the gas fan is arranged on the gas pipeline, and the air-gas mixer is located in the furnace of the semi-coke furnace.

2. The device for utilizing waste heat from tail gas of a blue charcoal furnace according to claim 1, characterized in that: A plurality of air-gas mixers are arranged side by side at the bottom of the furnace of the blue charcoal furnace.

3. The device for utilizing waste heat from tail gas of a blue charcoal furnace according to claim 1, characterized in that: The cooling section of the blue charcoal furnace is arranged at the bottom of the blue charcoal furnace, the discharging machine is arranged at the bottom of the cooling section of the blue charcoal furnace, and a pusher is arranged at one side of the cooling section of the blue charcoal furnace.

4. The device for utilizing waste heat from tail gas of a blue charcoal furnace according to claim 1, characterized in that: The tubular heat exchanger also includes a water collecting tank and a slag cleaning port.

5. The device for utilizing waste heat from tail gas of a blue charcoal furnace according to claim 1, characterized in that: The discharging machine also includes a discharger.

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