Flue gas waste heat recovery system for heating furnace of continuous reforming device
By utilizing high-temperature flue gas to preheat air and remove fuel gas impurities in the waste heat recovery system of the heating furnace, the problems of heat loss and salt blockage caused by direct emission of flue gas are solved, and heat recovery and stable operation of the device are achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-04
- Publication Date
- 2026-03-10
AI Technical Summary
The direct emission of flue gas from the heating furnace of the continuous reforming unit leads to heat loss and contains impurities that cause salt precipitation and blockage, posing safety risks and environmental pollution.
Design a flue gas waste heat recovery system that uses the high-temperature flue gas discharged from the heating furnace to preheat the air, controls the flow of flue gas through a sealed baffle, uses the heat in the flue gas to preheat the combustion air, and installs a dechlorinator in the fuel gas pipeline to remove impurities and prevent salt precipitation.
It enables the recovery and utilization of flue gas heat, improves combustion efficiency, reduces energy consumption, ensures normal operation of the equipment, and reduces safety risks and environmental pollution.
Smart Images
Figure CN223985590U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a flue gas waste heat recovery technology field, specifically is a continuous reforming device heating furnace flue gas waste heat recovery system. BACKGROUND
[0002] The burner of continuous reforming device heating furnace is usually forced ventilation burner, and the design exhaust gas temperature is about 180 DEG C, and the excess air coefficient is about 20%, and the flue gas contains higher heat, and the heat loss is caused by direct emission after purification, therefore, there is space for reducing exhaust gas temperature and improving flue gas thermal efficiency.The fuel gas of burner comes from part of tower top gas from the debutanizer, and the tower top gas contains H2S, NH3 and HCl and other impurities, and the impurities react to generate ammonium chloride and ammonium sulfide, and the salt is precipitated and blocked in the heating furnace system pilot lamp, flame arrester and burner metal hose and preheater, flue low-temperature section or dead angle.Impact device stable operation, increase workload, and in flammable and explosive gas environment, disassembly and cleaning operation exist safety risk, also easy to cause environmental pollution. CONTENT OF UTILITY MODEL
[0003] The utility model discloses a continuous reforming device heating furnace flue gas waste heat recovery system that recycles heat in flue gas to solve the problem of heat loss caused by direct emission of continuous reforming device heating furnace flue gas.
[0004] To solve the above technical problems, the utility model discloses a heating furnace, at least one burner is equipped with in the heating furnace, the heating furnace is connected with also the chimney, the burner is connected with air delivery pipe, fuel gas pipeline, and its structural characteristics are: the sealing baffle that can open or close for controlling the flow of flue gas in the chimney is equipped in the chimney, the chimney section of the front end of sealing baffle is connected with one end of flue gas extraction pipe, the other end of flue gas extraction pipe is connected with the chimney section of the rear end of sealing baffle, air preheater and draft fan are sequentially arranged on flue gas extraction pipe along the direction of flue gas flow, and the air inlet and outlet of air preheater are connected with air delivery pipe.
[0005] After the high-temperature flue gas discharged by the heating furnace enters the chimney, the heat in the flue gas is used to preheat air, the sealing baffle is closed, the flue gas cannot flow through the sealing baffle and directly flows into the chimney at the rear end of the sealing baffle, under the suction of the induced draft fan, the flue gas in the chimney at the front end of the sealing baffle flows into the flue gas leading pipe, the flue gas in the flue gas leading pipe flows into the air preheater, the air in the air conveying pipe also flows into the air preheater, the air absorbs the heat in the flue gas and is heated in the air preheater, the temperature of the flue gas is lowered after the flue gas heats the air, the waste heat in the flue gas is recycled, the flue gas after being cooled is sent into the chimney section at the rear end of the sealing baffle by the induced draft fan and is discharged, the preheated air is sent into the burner of the heating furnace by the air conveying pipe and is combusted, which is beneficial to improving the combustion effect and the furnace temperature.
[0006] The air conveying pipe section connected with the air preheater inlet is provided with a blower.
[0007] The fuel gas pipeline comprises a chlorine-containing fuel gas pipe connected with the inlet of a fuel gas dechlorination device for removing chlorine impurities in the fuel gas, an outlet of the fuel gas dechlorination device is connected with a dechlorinated fuel gas conveying pipe, the dechlorinated fuel gas conveying pipe is provided with a fuel gas branch pipe connected with the burner.
[0008] The dechlorinated fuel gas conveying pipe is provided with a fuel gas distribution tank and a fuel gas heat exchanger arranged in sequence along the fuel gas flow direction, and the fuel gas distribution tank and the fuel gas heat exchanger are arranged on the dechlorinated fuel gas conveying pipe section between the fuel gas dechlorination device and the fuel gas branch pipe.
[0009] The dechlorinated fuel gas conveying pipe is further connected with a supplementary fuel gas pipe connected with the dechlorinated fuel gas conveying pipe section between the fuel gas dechlorination device and the fuel gas distribution tank.
[0010] The continuous reforming device heating furnace flue gas waste heat recovery system of the utility model heats air by using the heat in the high-temperature flue gas discharged by the heating furnace, the heated air enters the burner of the combustion furnace for combustion support, the waste heat in the flue gas is recycled, and energy consumption is saved; chlorine impurities are removed after the chlorine-containing fuel gas is treated by the fuel gas dechlorination device, salt precipitation caused by the chlorine-containing fuel gas in the heating furnace and the flue is avoided, normal operation of the device is ensured, and safety risks and environmental pollution are reduced. BRIEF DESCRIPTION OF DRAWINGS
[0011] Figure 1 It is a structural schematic view of the utility model;
[0012] Figure: 1, chlorine-containing fuel gas inlet pipe; 101, fuel gas bypass pipe; 2, fuel gas dechlorination device; 3, dechlorinated fuel gas delivery pipe; 31, supplementary fuel gas inlet pipe; 32, fuel gas branch pipe; 4, fuel gas distribution tank; 5, fuel gas heat exchanger; 6, heating furnace; 61, burner; 7, chimney; 71, sealing baffle; 8, flue gas outlet pipe; 9, air preheater; 10, induced draft fan; 11, air delivery pipe; 111, air bypass pipe; 12, air suction port; 13, air blower. DETAILED DESCRIPTION
[0013] Reference Figure 1 A continuous reforming device heating furnace flue gas waste heat recovery system, comprising a heating furnace 6 and air pipe and fuel gas pipe connected with the heating furnace 6. The heating furnace 6 of the continuous reforming device can adopt a four-in-one furnace, the heating furnace 6 is provided with at least one burner 61, the heating furnace 6 is connected with a chimney 7, and the burner 61 is connected with the air pipe and the fuel gas pipe. The chimney 7 is provided with a sealing baffle 71 for controlling the flow of flue gas in the chimney 7, and the sealing baffle 71 can be opened or closed to control whether the flue gas can pass through the sealing baffle 71. The sealing baffle 71 can adopt the form of a valve plate. When the sealing baffle 71 is closed, the flue gas cannot pass through the sealing baffle 71. Rotating the sealing baffle 71 to open the sealing baffle 71, the flue gas can pass through the sealing baffle 71. The chimney section 7 at the front end of the sealing baffle 71 is connected with one end of a flue gas outlet pipe 8, and the other end of the flue gas outlet pipe 8 is connected with the chimney 7 section at the rear end of the sealing baffle 71. The flue gas outlet pipe 8 is equivalent to a bypass of the sealing baffle 71. In the utility model, the flow direction of the flue gas in the chimney 7 and the pipe and the flow direction of the air and the fuel gas in the pipe are all from front to back. The front end and the rear end of the sealing baffle 71 are based on the flow direction of the flue gas. The air preheater 9 and the induced draft fan 10 are arranged in sequence on the flue gas outlet pipe 8 along the flow direction of the flue gas. The air preheater 9 is used for preheating the air entering the burner 61. The air pipe comprises an air delivery pipe 11 connected to the burner 61 of the heating furnace 6 to provide combustion air for the burner 61. The air delivery pipe 11 is connected with the air inlet and outlet of the air preheater 9, and the flue gas is connected with the flue gas inlet and outlet of the air preheater 9. The principle of the air preheater 9 is a heat exchanger. The air and the flue gas exchange heat in the air preheater 9. The air absorbs the heat in the flue gas and is heated, and the heat of the flue gas is absorbed and cooled. The induced draft fan 10 is arranged at the rear end of the air preheater 9. The cooled flue gas enters the induced draft fan 10 to protect the induced draft fan 10 to a certain extent. The air suction port 12 is arranged at the air inlet end of the air delivery pipe 11. The air blower 13 is arranged on the air delivery pipe 11 between the air suction port 12 and the air preheater 9. The air blower 13 is arranged at the front end of the air preheater 9. The normal temperature air enters the air blower 13 to protect the air blower 13. For example, Figure 1As shown, the air supply pipe 11 is provided with an air bypass pipe 111 connected in parallel with the air preheater 9, so that air can enter the burner 61 directly without passing through the air preheater 9.
[0014] Reference Figure 1 The fuel gas for the heating furnace 6 includes overhead gas from the butane removal tower, which contains impurities such as H2S, NH3, and HCl. The fuel gas pipeline includes a chlorinated fuel gas inlet pipe 1 that transports chlorinated fuel gas from the butane removal tower. The chlorinated fuel gas inlet pipe 1 is connected to the inlet of a fuel gas dechlorinator 2 for dechlorination. The outlet of the fuel gas dechlorinator 2 is connected to a dechlorinated fuel gas delivery pipe 3. The fuel gas dechlorinator 2 is filled with packing material capable of adsorbing and removing chlorine-containing impurities, such as activated alumina packing. The dechlorinated fuel gas delivery pipe 3 is equipped with a supplementary fuel gas inlet pipe 31 and a fuel gas separator 4 arranged sequentially along the fuel gas flow direction. Fuel gas heat exchanger 5, fuel gas branch pipe 32, and supplementary fuel gas supply pipe 31 are used to introduce high-pressure gas to supplement fuel for heating furnace 6. The pressure of the high-pressure gas is higher than the pressure of the fuel gas discharged from fuel gas dechlorinator 2. Fuel gas separator 4 removes liquid droplets from the fuel gas. Fuel gas heat exchanger 5 is used to heat the fuel gas, increasing the temperature of the fuel gas entering burner 61, thereby improving combustion efficiency and furnace temperature. The heating medium of fuel gas heat exchanger 5 can be steam or waste heat from the device. Part of the heated fuel gas enters burner 61 through fuel gas branch pipe 32, and the remaining fuel gas is used as fuel for other furnaces; such as Figure 1 As shown, a fuel gas bypass pipe 101 is provided on the chlorinated fuel gas inlet pipe 1 and is connected in parallel with the fuel gas dechlorinator 2. One end of the fuel gas bypass pipe 101 is connected to the chlorinated fuel gas inlet pipe 1 and the other end is connected to the dechlorinated fuel gas delivery pipe 3. The fuel gas in the chlorinated fuel gas inlet pipe 1 can directly enter the dechlorinated fuel gas delivery pipe 3 without passing through the fuel gas dechlorinator 2.
[0015] It should be noted that the actual furnace body is also equipped with accessories such as thermometers and inspection ports, and the tank body is also equipped with accessories such as instruments, valves, and inspection ports. The pipeline is also equipped with valves such as control valves, regulating valves, and check valves, as well as other accessories such as detection instruments. This is a standard feature in this field and is not shown in the accompanying drawings or text.
[0016] Working Principle: During the ignition stage, the overhead gas from the butane removal tower of the continuous reforming unit enters the chlorinated fuel gas inlet pipe 1. The overhead gas contains impurities such as H2S, NH3, and HCl. The chlorinated fuel gas enters the fuel gas dechlorinator 2 to remove impurities such as HCl. The dechlorinated fuel gas then enters the dechlorinated fuel gas delivery pipe 3. A portion of the fuel gas also enters the dechlorinated fuel gas delivery pipe 3 via the supplementary fuel gas inlet pipe 31. The fuel gas then passes sequentially through the fuel gas separator 4 and the fuel gas heat exchanger 5. The fuel gas separator 4 removes liquid droplets from the fuel gas, and the fuel gas heat exchanger 5 heats the fuel gas to approximately 150°C. A portion of the fuel gas enters the burner 61 of the heater 6 via the fuel gas branch pipe 32. The dechlorination treatment of the chlorinated fuel gas prevents salt precipitation in the heater 6 and flue gas. To reduce the frequency of shutdowns and maintenance and ensure the normal operation of the equipment, blower 13 is turned on to send combustion air into burner 61 through air delivery pipe 11. The furnace temperature of furnace 6 and the temperature of exhaust gas gradually increase. The sealing baffle 71 is closed and induced draft fan 10 is turned on to extract the flue gas from chimney 7 through flue gas outlet pipe 8. The flue gas is heated by air preheater 9. After the flue gas releases heat, its temperature decreases. The temperature of the air after heat exchange in air preheater 9 rises to about 130°C before entering burner 61. This helps to improve combustion efficiency and furnace temperature and save energy. The temperature of the flue gas after cooling by air preheater 9 drops to about 80°C and is then sent to the chimney 7 section behind sealing baffle 71 through flue gas outlet pipe 8 for discharge. The waste heat in the flue gas is recovered and utilized.
[0017] The waste heat recovery system of the continuous reforming furnace of this utility model utilizes the waste heat in the high-temperature flue gas discharged from the furnace to preheat the combustion air, realizing the recovery and utilization of heat in the flue gas. The preheated air enters the burner for combustion, which can improve the combustion effect and save energy. The chlorine-containing fuel gas is treated by the fuel gas dechlorinator before entering the burner for combustion, which can avoid salt precipitation in the furnace and flue and blockage caused by salt precipitation, so as to ensure the stable operation of the furnace and reduce safety risks and environmental pollution.
Claims
1. A continuous reforming device heating furnace flue gas waste heat recovery system, comprising a heating furnace (6) provided with at least one burner (61), the heating furnace (6) is further connected with a chimney (7), the burner (61) is connected with an air delivery pipe (11), a fuel gas pipe, characterized in that: The chimney (7) is provided with a sealing baffle (71) capable of being opened or closed for controlling the flow of flue gas in the chimney (7), the chimney (7) section at the front end of the sealing baffle (71) is connected with one end of the flue gas leading pipe (8), the other end of the flue gas leading pipe (8) is connected with the chimney (7) section at the rear end of the sealing baffle (71), the flue gas leading pipe (8) is provided with an air preheater (9) and an induced draft fan (10) arranged in sequence along the flue gas flow direction, the air inlet and outlet of the air preheater (9) are connected with the air conveying pipe (11). 2. The continuous reformer furnace flue gas waste heat recovery system according to claim 1, characterized by: The air conveying pipe (11) section connected with the air preheater (9) inlet is provided with a blower (13).
3. The continuous reformer furnace flue gas waste heat recovery system according to claim 1, characterized in that: The fuel gas pipeline comprises a chlorine-containing fuel gas inlet pipe (1) for conveying chlorine-containing fuel gas, the chlorine-containing fuel gas inlet pipe (1) is connected with the inlet of a fuel gas dechlorination device (2) for removing chlorine impurities in the fuel gas, the outlet of the fuel gas dechlorination device (2) is connected with a dechlorinated fuel gas conveying pipe (3), the dechlorinated fuel gas conveying pipe (3) is provided with a fuel gas branch pipe (32), and the fuel gas branch pipe (32) is connected with a burner (61).
4. The continuous reformer furnace flue gas waste heat recovery system according to claim 3, characterized by: The dechlorinated fuel gas conveying pipe (3) is provided with a fuel gas distribution tank (4) and a fuel gas heat exchanger (5) arranged in sequence along the fuel gas flow direction, and the fuel gas distribution tank (4) and the fuel gas heat exchanger (5) are arranged on the dechlorinated fuel gas conveying pipe (3) section between the fuel gas dechlorination device (2) and the fuel gas branch pipe (32).
5. The continuous reformer furnace flue gas waste heat recovery system of claim 4, wherein: The dechlorinated fuel gas conveying pipe (3) is also connected with a supplementary fuel gas inlet pipe (31), and the supplementary fuel gas inlet pipe (31) is connected with the dechlorinated fuel gas conveying pipe (3) section between the fuel gas dechlorination device (2) and the fuel gas distribution tank (4).