CN220582488U - Combustion-supporting air preheating system in waste sulfuric acid cracking process - Google Patents
Combustion-supporting air preheating system in waste sulfuric acid cracking process Download PDFInfo
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- CN220582488U CN220582488U CN202322232098.0U CN202322232098U CN220582488U CN 220582488 U CN220582488 U CN 220582488U CN 202322232098 U CN202322232098 U CN 202322232098U CN 220582488 U CN220582488 U CN 220582488U
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Abstract
本实用新型属于化工工艺技术领域，涉及一种废硫酸裂解工艺中助燃空气的预热系统，其特征在于：它包括三级空气预热器，第一级空气预热器和第二级空气预热器为利用裂解后的高温烟气预热助燃空气的空气预热器，第三级空气预热器为利用预热后的高温空气预热助燃空气的空气预热器。本实用新型的特点在于不需要额外的能耗，解决现有废硫酸裂解工艺中空气预热器高温烟气侧因局部温度过低造成的露点腐蚀的问题。
The utility model belongs to the field of chemical process technology and relates to a combustion-supporting air preheating system in a waste sulfuric acid cracking process. It is characterized in that it includes a three-stage air preheater, a first-stage air preheater and a second-stage air preheater. The heater is an air preheater that uses cracked high-temperature flue gas to preheat the combustion air, and the third-stage air preheater is an air preheater that uses the preheated high-temperature air to preheat the combustion air. The utility model is characterized in that it does not require additional energy consumption and solves the problem of dew point corrosion caused by local low temperature on the high-temperature flue gas side of the air preheater in the existing waste sulfuric acid cracking process.
Description
Technical Field
The utility model relates to an improvement of a combustion air preheating mode in a waste sulfuric acid cracking process, and belongs to the technical field of chemical engineering processes.
Background
In the existing waste sulfuric acid cracking process, fuel gas and combustion air are required to be mixed and combusted in an incinerator to generate high temperature, so that the waste sulfuric acid is decomposed at the high temperature. In order to reduce the consumption of fuel gas and to reduce the operating costs, it is necessary to raise the temperature of the combustion air entering the furnace as much as possible. The heat of the high temperature flue gas is currently generally used to heat the combustion air. However, the direct heat exchange between the normal-temperature air and the high-temperature flue gas can cause dew point corrosion due to the excessively low local temperature of the heat exchanger. To avoid this, it is necessary to preheat the air to a certain temperature and then exchange heat with the high temperature flue gas.
The prior air preheating method adopted in the waste acid cracking process comprises two types of steam heating and cold and hot air mixing.
The steam heating method is to preheat air in a steam heater using steam as a heat source. The method needs to additionally increase the consumption of steam and has larger energy consumption.
The cold and hot air mixing method is to add a hot air reflux pipeline on the air pipeline before entering the cracking furnace, and connect with the inlet pipeline of the air blower, utilize the negative pressure of the inlet pipeline of the blower to reflux part of the hot air, the hot air of reflux is mixed with the normal temperature air introduced from the atmosphere and heated, achieve the goal of preheating the air. The method needs to increase the flow of the air blower and directly increases the electricity consumption.
Disclosure of Invention
The utility model aims to provide a preheating system for combustion air in a waste sulfuric acid cracking process, which fully utilizes heat energy in high-temperature flue gas after waste acid cracking and does not need to increase extra energy consumption.
The main technical scheme of the utility model is as follows: the preheating system of combustion air in the waste sulfuric acid cracking process is characterized in that: the device comprises three-stage air preheaters, wherein the first-stage air preheater and the second-stage air preheater are air preheaters for preheating combustion air by using cracked high-temperature flue gas, and the third-stage air preheater is an air preheater for preheating combustion air by using preheated high-temperature air.
Preferably, the three-stage air preheaters all adopt shell-and-tube heat exchangers.
Preferably, the combustion air pipeline is sequentially communicated with the shell side of the third-stage air preheater, the shell side of the second-stage air preheater, the tube side of the third-stage air preheater and the shell side of the first-stage air preheater; the high-temperature flue gas pipeline is sequentially communicated with the tube pass of the first-stage air preheater and the tube pass of the second-stage air preheater.
Preferably, the combustion air line is provided with a booster fan.
Preferably, the shell side of the first stage air preheater is in communication with the incinerator.
Preferably, the tube side of the second-stage air preheater is communicated with the purifying unit.
Preferably, a secondary line regulating valve for regulating the temperature of the flue gas entering the second-stage air preheater is arranged on the high-temperature flue gas pipeline, and the temperature of the air entering the second-stage air preheater is regulated to be not lower than 170 ℃ so as to avoid dew point corrosion.
The utility model adopts three-stage air preheating, the cracked high-temperature flue gas preheats air to a certain temperature in the first and second-stage air preheaters, and the preheated high-temperature air is used for heating normal-temperature air in the third-stage air preheater.
The utility model is characterized in that no extra energy consumption is needed, and the problem of dew point corrosion caused by too low local temperature on the high-temperature flue gas side of the air preheater in the existing waste sulfuric acid pyrolysis process is solved.
Drawings
FIG. 1 is a schematic diagram of the connection of a combustion air preheating system in a spent sulfuric acid cracking process according to an embodiment of the utility model.
In the figure, a 1-first stage air preheater, a 2-second stage air preheater, a 3-third stage air preheater and a 4-booster fan are shown.
Description of the embodiments
The following further illustrates the essence of the present utility model with reference to examples and drawings, which are only for explanation of the present utility model and do not limit the scope of the present utility model.
Examples
The preheating system of the combustion air in the waste sulfuric acid cracking process refers to the attached figure 1, and mainly comprises three stages of air preheaters, wherein the first stage of air preheater (1) and the second stage of air preheater (2) are air preheaters for preheating the combustion air by using cracked high-temperature flue gas, and the third stage of air preheater (3) is an air preheater for preheating the combustion air by using preheated high-temperature air.
In the embodiment, the three-stage air preheaters all adopt shell-and-tube heat exchangers.
In the embodiment, a combustion air pipeline is sequentially communicated with a shell side of the third-stage air preheater (3), a shell side of the second-stage air preheater (2), a tube side of the third-stage air preheater (3) and a shell side of the first-stage air preheater (1), and the shell side of the first-stage air preheater (1) is communicated with the incinerator; the high-temperature flue gas pipeline is sequentially communicated with the tube pass of the first-stage air preheater (1) and the tube pass of the second-stage air preheater (2), and the tube pass of the second-stage air preheater (2) is communicated with the purifying unit.
The embodiments operate as follows: the high-temperature flue gas from the boiler is cooled to about 380 ℃ after passing through the tube pass of the first-stage air preheater (1) and the tube pass of the second-stage air preheater (2) in turn and exchanging heat with air, and then is sent to the purification unit. After being pressurized by an air booster fan (4), normal-temperature air enters a shell side of a third-stage air preheater (3) to exchange heat with hot air, the temperature rises to about 170 ℃, enters a shell side of a second-stage air preheater (2) to exchange heat with high-temperature flue gas, then rises to about 320 ℃, returns to a tube side of the third-stage air preheater (3) to exchange heat with normal-temperature air, finally enters a shell side of a first-stage air preheater (1) to exchange heat with the high-temperature flue gas, and enters an incinerator after rising to about 450 ℃.
In order to ensure that the temperature of air entering the shell side of the second-stage air preheater (2) is not lower than 170 ℃, a secondary line regulating valve is arranged on a high-temperature flue gas pipeline, and the temperature of flue gas entering the second-stage air preheater (2) is regulated to avoid dew point corrosion.
The utility model does not need extra energy consumption, only fully utilizes the heat energy of the high-temperature flue gas, and solves the problem of dew point corrosion on the high-temperature flue gas side of the air preheater caused by too low local temperature in the waste sulfuric acid cracking process.
This embodiment is not described and is well known in the art.
Claims (7)
1. A preheating system of combustion air in a waste sulfuric acid cracking process is characterized in that: the device comprises three-stage air preheaters, wherein the first-stage air preheater and the second-stage air preheater are air preheaters for preheating combustion air by using cracked high-temperature flue gas, and the third-stage air preheater is an air preheater for preheating combustion air by using preheated high-temperature air.
2. The system according to claim 1, wherein: the three-stage air preheaters are all shell-and-tube heat exchangers.
3. The system according to claim 1 or 2, characterized in that: the combustion air pipeline is sequentially communicated with the shell side of the third-stage air preheater, the shell side of the second-stage air preheater, the tube side of the third-stage air preheater and the shell side of the first-stage air preheater; the high-temperature flue gas pipeline is sequentially communicated with the tube pass of the first-stage air preheater and the tube pass of the second-stage air preheater.
4. A system according to claim 3, characterized in that: the combustion air pipeline is provided with a booster fan.
5. A system according to claim 3, characterized in that: the shell side of the first stage air preheater is communicated with the incinerator.
6. A system according to claim 3, characterized in that: and the tube side of the second-stage air preheater is communicated with the purifying unit.
7. A system according to claim 3, characterized in that: and a secondary line regulating valve for regulating the temperature of the flue gas entering the second-stage air preheater is arranged on the high-temperature flue gas pipeline.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322232098.0U CN220582488U (en) | 2023-08-18 | 2023-08-18 | Combustion-supporting air preheating system in waste sulfuric acid cracking process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322232098.0U CN220582488U (en) | 2023-08-18 | 2023-08-18 | Combustion-supporting air preheating system in waste sulfuric acid cracking process |
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| CN220582488U true CN220582488U (en) | 2024-03-12 |
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| CN202322232098.0U Active CN220582488U (en) | 2023-08-18 | 2023-08-18 | Combustion-supporting air preheating system in waste sulfuric acid cracking process |
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2023
- 2023-08-18 CN CN202322232098.0U patent/CN220582488U/en active Active
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