Low-temperature corrosion prevention waste heat recovery device of hydrogen production reformer

Abstract

The utility model relates to a hydrogen production reformer low-temperature corrosion prevention waste heat recovery device, which comprises a radiation chamber hearth, a burner, an air preheater, an induced draft fan and an air blower, the burner is arranged at the top of the radiation chamber hearth, the air preheater is arranged on one side of the radiation chamber hearth, flue gas of the radiation chamber hearth is introduced into the air preheater, and the induced draft fan is arranged on the other side of the radiation chamber hearth. An inlet air duct and an outlet flue are arranged on the side, away from a hearth of the radiation chamber, of the air preheater, a canopy is arranged outside the combustor and connected with an air guide duct, a gas collection port is formed in the top of the canopy corresponding to the air guide duct, the top of the air guide duct is communicated with the gas collection port, and the bottom of the air guide duct is communicated with an air suction port of the inlet air duct. By recycling hot air at the furnace top, the temperature of air entering the air preheater can be adjusted, the temperature of the low-temperature heat exchange element can be increased, low-temperature condensate water can be effectively prevented from being separated out, low-temperature dew point corrosion is prevented, long-period operation of equipment is guaranteed, and the overall heat efficiency of the heating furnace is improved.

Description

Technical Field

[0001] This utility model relates to the technical field of converter equipment, specifically to a waste heat recovery device for preventing low-temperature corrosion in hydrogen production converters, which is applied to the waste heat recovery system of hydrogen production converter heating furnaces in the petroleum refining, petrochemical and coal chemical industries. Background Technology

[0002] With the rapid development of hydrogen production converter technology in China, some problems have also emerged. One issue is low-temperature corrosion of the air preheater, especially in northern regions, due to the low operating temperature. This corrosion can damage heat transfer elements, affecting heat exchange efficiency and reducing the overall thermal efficiency of the furnace. Corrosion also exacerbates ash accumulation, which reduces the contact area between flue gas and air, further worsening heat exchange efficiency. Therefore, there is an urgent need to design a waste heat recovery device to prevent low-temperature corrosion in hydrogen production converters. Utility Model Content

[0003] The purpose of this invention is to overcome the above-mentioned shortcomings and provide a waste heat recovery device for preventing low-temperature corrosion in a hydrogen production converter. It utilizes the waste heat of the burner and introduces hot air into the air intake through a guide duct. The guide duct is equipped with a baffle valve, and the opening and closing of the baffle valve controls the inflow of hot air, thereby changing the temperature of the air entering the air preheater and achieving the purpose.

[0004] The purpose of this utility model is achieved as follows:

[0005] A waste heat recovery device for preventing low-temperature corrosion in a hydrogen production converter includes a radiant furnace, a burner, an air preheater, an induced draft fan, and a blower. The burner is located at the top of the radiant furnace, and the air preheater is located on one side of the radiant furnace. The flue gas from the radiant furnace is introduced into the air preheater. The side of the air preheater away from the radiant furnace has an inlet duct and an outlet flue. A canopy is provided outside the burner, and the canopy is connected to a guide duct. The top of the canopy has a gas collection port corresponding to the guide duct. The top of the guide duct is connected to the gas collection port, and the bottom is connected to the air intake of the inlet duct.

[0006] Preferably, the air outlet of the air preheater is connected to an outlet duct, which in turn introduces the preheated air into the burner.

[0007] Preferably, the air preheater includes a heat exchanger shell with a flue gas inlet and a flue gas outlet. The heat exchanger shell is provided with a high-temperature heat exchange tube section and a low-temperature heat exchange tube section. The air inlet is located in the low-temperature heat exchange tube section, and the air outlet is located in the high-temperature heat exchange tube section. The low-temperature heat exchange tube section and the high-temperature heat exchange tube section are connected by an air passage.

[0008] Preferably, the air duct is equipped with a baffle valve.

[0009] Preferably, a temperature sensor is installed inside the low-temperature heat exchange tube section.

[0010] Preferably, the side opening of the air collection port is used to connect to the air guide duct, and the top and side wall of the air collection port are provided with a heat insulation layer.

[0011] Preferably, the side of the gas collecting port is also provided with an inspection door.

[0012] Preferably, the inlet duct introduces outside air into the air preheater via a blower, and the outlet duct draws heat-exchange flue gas from the air preheater to the chimney via an induced draft fan.

[0013] The beneficial effects of this utility model are:

[0014] The heat generated by the combustion of the burner at the top of the furnace is concentrated in the canopy. The hot air in the canopy is then guided to the air inlet of the air preheater through the air duct. This increases the air inlet temperature of the air preheater, reduces the amount of heat exchange components used, and effectively reduces the investment cost of the air preheater.

[0015] Since the hot air at the top of the furnace is kept above 20°C year-round, it is introduced to the air preheater through the air duct, which can effectively increase the temperature of the heat exchange elements. By setting temperature monitoring and adjusting the bypass flue gas temperature, the phenomenon of condensation due to excessively low temperature can be prevented, thus ensuring the long-term safe operation of the equipment. The reuse of hot air at the top of the radiant furnace improves the overall thermal efficiency of the heating furnace, bringing energy-saving economic benefits to the owner. Attached Figure Description

[0016] Figure 1 This is a front view of a waste heat recovery device for preventing low-temperature corrosion in a hydrogen production converter according to this utility model.

[0017] Figure 2 This is a top view of a waste heat recovery device for preventing low-temperature corrosion in a hydrogen production converter according to this utility model.

[0018] Figure 3 This is a left view of a waste heat recovery device for preventing low-temperature corrosion in a hydrogen production converter according to this utility model.

[0019] The components include: 1. Radiant furnace chamber; 2. Burner; 3. Air preheater; 3.1. Heat exchanger shell; 3.2. High-temperature heat exchange tube section; 3.3. Low-temperature heat exchange tube section; 3.4. Air inlet; 3.5. Air duct; 3.6. Exhaust fan; 4. Blower; 5. Inlet air duct; 6. Suction port; 6.1. Outlet flue; 7. Canopy; 8. Air collection port; 9. Air guide duct; 10. Chimney; 11. Outlet air duct; 12. Baffle valve; 13. Inspection door. Detailed Implementation

[0020] See Figure 1-3This utility model relates to a waste heat recovery device for preventing low-temperature corrosion in a hydrogen production converter, comprising a radiant furnace 1, a burner 2, an air preheater 3, an induced draft fan 4, and a blower 5. The burner 2 is located at the top of the radiant furnace 1 and extends into the radiant furnace 1. The air preheater 3 is located on one side of the radiant furnace 1, and the flue gas from the radiant furnace 1 is introduced into the air preheater 3. The side of the air preheater 3 away from the radiant furnace 1 is provided with an inlet air duct 6 and an outlet flue duct 7. The inlet air duct 6 is connected to the blower 5. The machine 5 introduces external air into the air preheater 3. The outlet air duct 8 guides the heat exchange flue gas from the air preheater 3 to the chimney 10 for discharge through the induced draft fan 6. The burner 2 is provided with a canopy 8, which completely encloses the exposed furnace part of the burner 2 to recover the waste heat generated by the combustion of the burner 2. The canopy 8 is connected to the air guide duct 9. The top of the canopy 8 is provided with an air collection port 8.1 corresponding to the air guide duct 9. The top of the air guide duct 9 is connected to the air collection port 8.1, and the bottom is connected to the air intake port 6.1 of the inlet air duct 6.

[0021] The air outlet of the air preheater 3 is connected to the outlet air duct 11, and the outlet air duct 11 introduces the preheated air into the burner 2.

[0022] The air preheater 3 includes a heat exchanger shell 3.1 with a flue gas inlet and a flue gas outlet. The heat exchanger shell 3.1 contains a high-temperature heat exchange tube section 3.2 and a low-temperature heat exchange tube section 3.3. An air inlet 3.4 is located in the low-temperature heat exchange tube section 3.3, and an air outlet 3.5 is located in the high-temperature heat exchange tube section 3.2. The low-temperature heat exchange tube section 3.3 and the high-temperature heat exchange tube section 3.2 are connected by an air passage 3.6. The high-temperature heat exchange tube section 3.2 and the low-temperature heat exchange tube section 3.3 are made of cast iron plate heat exchange elements, which are resistant to low-temperature corrosion.

[0023] A baffle valve 12 is installed on the air duct 9, and a temperature sensor is installed in the low-temperature heat exchange tube section 3.3. Both the baffle valve 12 and the temperature sensor are electrically connected to the controller. The temperature sensor monitors the temperature of the heat exchange elements in the low-temperature heat exchange tube section 3.3. When the ambient temperature is low and the heat exchange elements are too cold and condensation occurs, the temperature sensor feeds back the temperature to the controller. When the ambient temperature is lower than the preset standard value, the controller controls the baffle valve 12 to open, and the blower 5 uses the blower 5 to introduce the hot air generated by the burner in the canopy 8 into the air preheater 3 through the air duct 9, thereby increasing the temperature of the air entering the air preheater 3.

[0024] The side opening of the gas collection port 8.1 is used to connect to the air guide duct. The top and side walls of the gas collection port 8.1 are provided with a heat insulation layer to retain a large amount of residual heat generated near the combustion of the burner 2.

[0025] The side of the gas collection port is also provided with an inspection door 13.

[0026] By recycling the hot air from the furnace top, the temperature of the air entering the air preheater can be adjusted, the temperature of the low-temperature heat exchange elements can be increased, the precipitation of low-temperature condensate can be effectively prevented, low-temperature dew point corrosion can be prevented, the long-term operation of the equipment can be guaranteed, and the overall thermal efficiency of the heating furnace can be improved.

[0027] In addition to the above embodiments, this utility model also includes other implementation methods. All technical solutions formed by equivalent transformation or equivalent substitution should fall within the protection scope of the claims of this utility model.

Claims

1. A waste heat recovery device for preventing low-temperature corrosion in a hydrogen production converter, comprising a radiant furnace, a burner, an air preheater, an induced draft fan, and a blower, wherein the burner is disposed at the top of the radiant furnace, the air preheater is disposed on one side of the radiant furnace, the flue gas from the radiant furnace is introduced into the air preheater, and the air preheater has an inlet duct and an outlet flue on the side away from the radiant furnace, characterized in that: The burner is provided with a canopy, which is connected to an air duct. The top of the canopy is provided with an air collection port corresponding to the air duct. The top of the air duct is connected to the air collection port, and the bottom is connected to the air intake port of the inlet air duct.

2. The waste heat recovery device for preventing low-temperature corrosion in a hydrogen production converter according to claim 1, characterized in that: The air outlet of the air preheater is connected to the outlet duct, which in turn introduces the preheated air into the burner.

3. The waste heat recovery device for preventing low-temperature corrosion of a hydrogen production reformer according to claim 1 or 2, characterized in that: The air preheater includes a heat exchanger shell with a flue gas inlet and a flue gas outlet. The heat exchanger shell is provided with a high-temperature heat exchange tube section and a low-temperature heat exchange tube section. The air inlet is located in the low-temperature heat exchange tube section, and the air outlet is located in the high-temperature heat exchange tube section. The low-temperature heat exchange tube section and the high-temperature heat exchange tube section are connected by an air passage.

4. The waste heat recovery device for preventing low-temperature corrosion of a hydrogen production reformer according to claim 3, characterized by: The air duct is equipped with a baffle valve.

5. The waste heat recovery device for preventing low-temperature corrosion of a hydrogen production reformer according to claim 4, characterized by: Temperature sensors are installed inside the low-temperature heat exchange tube section.

6. The waste heat recovery device for preventing low-temperature corrosion in a hydrogen production converter according to claim 1, characterized in that: The side opening of the air collection port is used to connect to the air guide duct, and the top and side walls of the air collection port are provided with a heat insulation layer.

7. The waste heat recovery device for preventing low-temperature corrosion of a hydrogen production reformer according to claim 1 or 6, characterized in that: The side of the gas collection port is also equipped with an inspection door.

8. The waste heat recovery device for preventing low-temperature corrosion of a hydrogen production reformer according to claim 2, characterized by: The inlet duct introduces outside air into the air preheater via a blower, and the outlet duct draws heat-exchange flue gas from the air preheater to the chimney via an induced draft fan.

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