A flue gas waste heat recovery energy-saving device

Abstract

The utility model relates to the technical field of flue gas waste heat recovery, disclose a kind of flue gas waste heat recovery energy-saving device, including heating system and circulation system, the heating system includes ramming coke oven, tubular heat exchanger, hot oil tank and reboiler, and the ramming coke oven is connected with tubular heat exchanger by waste heat gas collector intercommunication, and the hot oil tank is communicated with tubular heat exchanger bottom, and the tubular heat exchanger top is communicated with reboiler side;The circulation system includes the cooling equipment, cooling medium pump, cooling medium storage tank of circulation intercommunication, and the cooling equipment side is communicated with reboiler, with the effect that the heat energy in the high-temperature flue gas generated in coke oven production process is effectively recycled.

Description

Technical Field

[0001] This utility model relates to the field of flue gas waste heat recovery technology, and in particular to an energy-saving device for flue gas waste heat recovery. Background Technology

[0002] High-temperature flue gas is a common byproduct in industrial production, mainly originating from combustion processes or chemical reactions, including but not limited to boiler combustion, metallurgical smelting, and chemical reactions. The temperature range of high-temperature flue gas is wide, depending on the specific industrial process and operating conditions. Generally, the temperature of high-temperature flue gas can rise from 200 degrees Celsius to 1500 degrees Celsius or even higher. This waste heat gas is large in volume and has a low calorific value; its direct emission results in a waste of thermal energy. Utility Model Content

[0003] The purpose of this invention is to provide a waste heat recovery and energy-saving device for flue gas, which effectively recovers the heat energy from the high-temperature flue gas generated during the coke oven production process.

[0004] The above-mentioned technical objective of this utility model is achieved through the following technical solution: including a heating system and a circulation system.

[0005] The heating system includes a stamped coking oven, a tubular heat exchanger, a hot oil tank, and a reboiler. The stamped coking oven and the tubular heat exchanger are connected by a waste heat collection pipe. The hot oil tank is connected to the bottom of the tubular heat exchanger, and the top of the tubular heat exchanger is connected to one side of the reboiler.

[0006] The circulation system includes a circulating cooling device, a cooling medium pump, and a cooling medium storage tank, with one side of the cooling device connected to a reboiler.

[0007] A further feature of this invention is that the cooling device is connected to the filter, and the filter is connected to the hot oil tank.

[0008] A further feature of this invention is that several air inlets at the bottom of the tamping coking furnace are connected to negative pressure exhaust pipes, the other end of which is connected to a waste heat collection pipe, and the waste heat collection pipe is connected to the tubular heat exchanger via a high-temperature fan.

[0009] A further feature of this invention is that a hot oil pump is connected between the tubular heat exchanger and the hot oil tank.

[0010] A further feature of this invention is that the cooling medium in the cooling medium storage tank is air or cold water.

[0011] A further feature of this invention is that the cooling device is preferably a plate cooler.

[0012] A further feature of this invention is that the filter is preferably a magnetic basket filter.

[0013] A further feature of this invention is that a hot oil circulation pump is connected between the tubular heat exchanger and the reboiler.

[0014] The beneficial effects of this utility model are:

[0015] 1. In the heating system, each air inlet at the bottom of the stamped coking oven is equipped with a negative pressure exhaust pipe. Waste heat from the stamped coking oven is collected and transported to a waste heat collection pipe, then transported to a tubular heat exchanger by a high-temperature fan. The heat transfer oil is stored in an underground hot oil tank. A hot oil pump pumps the 120°C heat transfer oil from the tank to the tubular heat exchanger, where waste heat is used to initially heat the oil, raising its temperature to 180°C. Subsequently, the heated oil is pumped to a reboiler via a hot oil circulation pump, transferring heat to the material to be heated—the lean ion liquid—introduced into the reboiler. The material then reacts with the heat transfer oil. The heating process involves heat exchange to heat the material. The heated lean ionic liquid rises from 85°C to 105°C upon entering the reboiler. The heat transfer oil exiting the reboiler passes through the cooling system, transferring heat to the cooling medium. Finally, it is recirculated back into the heating system by the hot oil pump to continue heating the material, achieving continuous operation. The heating of the lean ionic liquid is achieved through the combination of heat transfer oil and waste heat from flue gas. The entire heating system can quickly and accurately heat the material, ultimately recovering and utilizing the waste heat from the coking oven. This reduces the consumption of live steam in the desulfurization system used for external heating of the lean ionic liquid, significantly saving operating costs and resulting in substantial economic and environmental benefits.

[0016] 2. In the cooling system, the cooling medium is usually air or cold water, stored in a cooling medium storage tank. The cooling medium is pumped into the cooling equipment by a cooling medium pump, transferring heat to the heat transfer oil. The heat transfer oil exchanges heat with the cooling medium through the cooling interface, dissipating heat and lowering the temperature. Subsequently, the cooled heat transfer oil passes through a filtration device to remove impurities and contaminants, ensuring the quality of the heat transfer oil. Finally, the cooled heat transfer oil is recirculated into the heating system by a hot oil pump to continue heating the materials.

[0017] 3. The use of heat transfer oil technology to recover waste heat from high-temperature flue gas is an innovative energy-saving solution. It cleverly utilizes the excellent thermal conductivity of heat transfer oil to effectively recover the heat energy from the high-temperature flue gas generated during the coke oven production process.

[0018] 4. The negative pressure exhaust pipe can prevent exhaust gas leakage, and protect the environment while efficiently collecting heat.

[0019] 5. The use of a magnetic basket filter can remove impurities, protect pumps and valves, extend the service life of the entire equipment, and also extend the service life of the heat transfer oil. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the structure of this utility model.

[0022] In the diagram, 1. tamping coke oven; 2. tubular heat exchanger; 3. hot oil tank; 4. reboiler; 5. waste heat collection pipe; 6. high-temperature fan; 7. cooling equipment; 8. cooling medium pump; 9. cooling medium storage tank; 10. filter; 11. hot oil pump; 12. hot oil circulation pump. Detailed Implementation

[0023] The technical solution of this utility model will now be clearly and completely described with reference to specific embodiments. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0024] Example: An energy-saving device for flue gas waste heat recovery, such as... Figure 1As shown, the system includes a heating system and a circulation system. The heating system includes a stamping coke oven 1, a tubular heat exchanger 2, a hot oil tank 3, and a reboiler 4. The stamping coke oven and the tubular heat exchanger 2 are connected via a waste heat collection pipe 5. The hot oil tank 3 is connected to the bottom of the tubular heat exchanger 2. A hot oil pump 11 connects the tubular heat exchanger 2 and the hot oil tank 3. The top of the tubular heat exchanger 2 is connected to one side of the reboiler 4. The circulation system includes a circulating cooling device 7, a cooling medium pump 8, and a cooling medium storage tank 9. One side of the cooling device 7... The reboiler 4 is connected to the cooling device 7, which is connected to the filter 10. The filter 10 is connected to the hot oil tank 3. In the heating system, each air inlet at the bottom of the tamping coke oven 1 is equipped with a negative pressure exhaust pipe. After collecting the waste heat in the tamping coke oven 1, the waste heat is transported to the waste heat collection pipe 5, and then transported to the tubular heat exchanger 2 by the high-temperature fan 6. The heat transfer oil is stored in the underground hot oil tank 3, and the 120°C heat transfer oil in the hot oil tank 3 is transported to the tubular heat exchanger 2 by the hot oil pump 11. In this process, waste heat is used to initially heat the heat transfer oil, raising its temperature from the tubular heat exchanger 2 to 180°C. Subsequently, the heated heat transfer oil is pumped to the reboiler 4 via the hot oil circulation pump 12, transferring heat to the material to be heated—the lean ionic liquid—into the reboiler 4. The material to be heated exchanges heat with the heat transfer oil, achieving heating. The heated lean ionic liquid rises from 85°C upon entering the reboiler 4 to 105°C. The heat transfer oil exiting the reboiler 4 passes through the cooling device 7 in the cooling system, transferring heat to the cooling medium. Finally, it is recirculated back into the heating system by the hot oil pump 11 to continue heating the material, forming continuous operation. The heating of the lean ionic liquid is achieved through the combination of heat transfer oil and waste heat from flue gas. The entire heating system can quickly and accurately heat the material, ultimately recovering and utilizing the waste heat from the coking oven 1. This reduces the consumption of live steam in the desulfurization system used for external heating of the lean ionic liquid, greatly saving operating costs and demonstrating significant economic and environmental benefits.

[0025] In the cooling system, the cooling medium is usually air or cold water, which is stored in the cooling medium storage tank 9. The cooling medium is pumped to the cooling equipment 7 by the cooling medium pump 8, which transfers heat to the heat transfer oil. The heat transfer oil exchanges heat with the cooling medium through the cooling interface, dissipates heat, and lowers the temperature. The cooled heat transfer oil then passes through a filtration device to remove impurities and contaminants, ensuring the quality of the heat transfer oil. Finally, the cooled heat transfer oil is recirculated into the heating system by the hot oil pump 11 to continue heating the materials.

[0026] Furthermore, several air inlets at the bottom of the tamping coking furnace are connected to negative pressure exhaust pipes. The other end of the negative pressure exhaust pipe is connected to the waste heat collection pipe 5. The waste heat collection pipe 5 is connected to the tubular heat exchanger 2 through a high-temperature fan 6. The negative pressure exhaust pipe can prevent waste gas leakage and protect the environment while efficiently collecting heat.

[0027] Furthermore, the cooling medium in the cooling medium storage tank 9 is air or cold water, and the cooling device 7 is a plate cooler for rapid cooling and improved cooling efficiency.

[0028] Furthermore, the filter 10 is a magnetic basket filter 10, which can remove impurities, protect pump valves, improve the service life of the entire equipment, and also extend the service life of the heat transfer oil.

[0029] Working principle of a flue gas waste heat recovery energy-saving device:

[0030] In the heating system, each air inlet at the bottom of the stamped coking oven 1 is equipped with a negative pressure exhaust pipe. Waste heat from the stamped coking oven 1 is collected and transported to the waste heat collection pipe 5, and then transported to the tubular heat exchanger 2 by a high-temperature fan 6. The heat transfer oil is stored in an underground hot oil tank 3. A hot oil pump 11 pumps the 120°C heat transfer oil from the hot oil tank 3 to the tubular heat exchanger 2, where waste heat is used to initially heat the oil, raising its temperature to 180°C. Subsequently, the heated heat transfer oil is pumped to the reboiler 4 by a hot oil circulation pump 12, transferring heat to the material to be heated—the lean ion liquid—introduced into the reboiler 4. The material to be heated interacts with the heat transfer oil... The oil undergoes heat exchange to heat the material. The heated lean ionic liquid rises from 85°C to 105°C upon entering the reboiler 4. The heat transfer oil exiting the reboiler 4 passes through the cooling device 7 in the cooling system, transferring heat to the cooling medium. Finally, it is recirculated back into the heating system by the hot oil pump 11 to continue heating the material, forming continuous operation. The heating of the lean ionic liquid is achieved through the combination of heat transfer oil and waste heat from flue gas. The entire heating system can quickly and accurately heat the material, ultimately recovering and utilizing the waste heat from the tamping coke oven 1. This reduces the consumption of live steam in the desulfurization system used for external heating of the lean ionic liquid, greatly saving operating costs and resulting in significant economic and environmental benefits.

[0031] In the cooling system, the cooling medium is usually air or cold water, which is stored in the cooling medium storage tank 9. The cooling medium is pumped to the cooling equipment 7 by the cooling medium pump 8, which transfers heat to the heat transfer oil. The heat transfer oil exchanges heat with the cooling medium through the cooling interface, dissipates heat, and lowers the temperature. The cooled heat transfer oil then passes through a filtration device to remove impurities and contaminants, ensuring the quality of the heat transfer oil. Finally, the cooled heat transfer oil is recirculated into the heating system by the hot oil pump 11 to continue heating the materials.

Claims

1. A flue gas waste heat recovery energy-saving device, characterized in that: Including heating systems and circulation systems, The heating system includes a stamped coking oven (1), a tubular heat exchanger (2), a hot oil tank (3), and a reboiler (4). The stamped coking oven and the tubular heat exchanger (2) are connected by a waste heat collection pipe (5). The hot oil tank (3) is connected to the bottom of the tubular heat exchanger (2). The top of the tubular heat exchanger (2) is connected to one side of the reboiler (4). The circulation system includes a circulating cooling device (7), a cooling medium pump (8), and a cooling medium storage tank (9), with one side of the cooling device (7) connected to the reboiler (4).

2. The waste heat recovery and energy-saving device for flue gas according to claim 1, characterized in that: The cooling device (7) is connected to the filter (10), and the filter (10) is connected to the hot oil tank (3).

3. The waste heat recovery and energy-saving device for flue gas according to claim 1, characterized in that: Several air inlets at the bottom of the tamping coking oven are connected to negative pressure exhaust pipes. The other end of the negative pressure exhaust pipe is connected to the waste heat collection pipe (5). The waste heat collection pipe (5) is connected to the tubular heat exchanger (2) through a high-temperature fan (6).

4. The waste heat recovery and energy-saving device for flue gas according to claim 1, characterized in that: A hot oil pump (11) is connected between the tubular heat exchanger (2) and the hot oil tank (3).

5. The waste heat recovery and energy-saving device for flue gas according to claim 1, characterized in that: The cooling medium in the cooling medium storage tank (9) is air or cold water.

6. The waste heat recovery and energy-saving device for flue gas according to claim 2, characterized in that: The cooling device (7) is preferably a plate cooler.

7. The waste heat recovery and energy-saving device for flue gas according to claim 6, characterized in that: The filter (10) is preferably a magnetic basket filter (10).

8. The waste heat recovery and energy-saving device for flue gas according to claim 7, characterized in that: A hot oil circulation pump (12) is connected between the tubular heat exchanger (2) and the reboiler (4).

Images