CN214470297U - Phthalic anhydride reaction gas heat recovery system - Google Patents
Phthalic anhydride reaction gas heat recovery system Download PDFInfo
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- CN214470297U CN214470297U CN202023095732.3U CN202023095732U CN214470297U CN 214470297 U CN214470297 U CN 214470297U CN 202023095732 U CN202023095732 U CN 202023095732U CN 214470297 U CN214470297 U CN 214470297U
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- exchange tube
- heat exchange
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Abstract
The utility model discloses a phthalic anhydride reaction gas heat recovery system, which comprises a phthalic anhydride reactor, a cooler and an air preheater, wherein the reaction gas outlet of the phthalic anhydride reactor is connected with the inlet of the cooler through a pipeline; the cooler is a two-section type gas cooler, an independent front section heat exchange tube bundle and a back section heat exchange tube bundle are arranged inside the cooler, an inlet of the front section heat exchange tube bundle is connected with a water inlet pipeline and an outlet of the front section heat exchange tube bundle is connected with a steam pipeline, an inlet of the back section heat exchange tube bundle is connected with an outlet of an air preheater through a pipeline, an outlet of the back section heat exchange tube bundle is connected with an air inlet of a phthalic anhydride reactor through a pipeline, and an inlet of the air preheater is connected with an air inlet pipeline. The utility model discloses can realize the heat recovery of phthalic anhydride reaction gas and utilize the heat of reaction gas to become vapor with the water heating for subsequent use, further heat the air and heat up and directly get into phthalic anhydride reactor and participate in ortho-xylene oxidation reaction.
Description
Technical Field
The utility model relates to a phthalic anhydride production technical field, concretely relates to phthalic anhydride reaction gas heat recovery system.
Background
The prior production process of phthalic anhydride comprises the following steps: gasifying the air preheated by 2.0MPa steam and o-xylene in a gasifier, introducing the air and o-xylene into a reactor, oxidizing the o-xylene on the surface of a V-Ti catalyst by air to generate phthalic anhydride (the main reaction generates phthalic anhydride, the side reaction generates byproducts such as maleic anhydride, benzoic acid, citric acid and the like, and partial oxidation generates CO2CO), which is a strongly exothermic reaction in the explosive range, the heat of reaction is removed by the circulating molten salt and high-pressure steam is generated in the molten salt cooler. The reaction gas is discharged from the bottom of the reactor, passes through a gas cooler and then enters the condensation and recovery process of phthalic anhydride. The temperature of the reaction gas discharged from the reactor was about 350 ℃, and the reaction gas was cooled to 170 ℃ by a cooler. Therefore, if a large amount of waste heat in the reaction gas is not utilized, not only the environment is thermally polluted, but also the resource cost is caused.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the shortcomings of the prior art and provide a heat recovery system for phthalic anhydride reaction gas.
In order to realize the purpose, the technical scheme of the utility model is that: the utility model provides a phthalic anhydride reaction gas heat recovery system, includes phthalic anhydride reactor, cooler, its characterized in that: the reaction gas outlet of the phthalic anhydride reactor is connected with the inlet of the cooler through a pipeline; the cooler is a two-section type gas cooler, an independent front section heat exchange tube bundle and a back section heat exchange tube bundle are arranged inside the cooler, an inlet of the front section heat exchange tube bundle is connected with a water inlet pipeline and an outlet of the front section heat exchange tube bundle is connected with a steam pipeline, an inlet of the back section heat exchange tube bundle is connected with an outlet of an air preheater through a pipeline, an outlet of the back section heat exchange tube bundle is connected with an air inlet of a phthalic anhydride reactor through a pipeline, and an inlet of the air preheater is connected with an air inlet pipeline.
Further, the method comprises the following steps of; the air preheater is characterized in that a finned heat exchange tube bundle is arranged in the air preheater, an inlet of the finned heat exchange tube bundle is connected with a steam pipeline, an outlet of the finned heat exchange tube bundle is connected with a liquid drainage pipeline, a steam control valve is arranged on the steam pipeline at the inlet of the finned heat exchange tube bundle, an air temperature measuring instrument is arranged on the outlet pipeline of the air preheater, and the air temperature measuring instrument is electrically connected with the steam control valve.
Further, the method comprises the following steps of; and a drain valve is arranged on the liquid discharge pipeline.
The utility model has the advantages that: the utility model discloses a heat recovery system can realize the heat recycle of phthalic anhydride reaction gas, and the heat that utilizes the reaction gas heats the vapor with water for spare, further heats the air and heaies up and directly gets into phthalic anhydride reactor and participate in o-xylene oxidation reaction.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
In the figure: 1. a phthalic anhydride reactor; 2. a cooler; 3. an air preheater; 4. a front section heat exchange tube bundle; 5. a rear section heat exchange tube bundle; 6. a finned heat exchange tube bundle; 7. a steam control valve; 8. an air temperature measuring instrument; 9. a trap.
Detailed Description
Example (b):
as shown in figure 1, a heat recovery system for phthalic anhydride reaction gas comprises a phthalic anhydride reactor 1 and a cooler 2, and is characterized in that: the device also comprises an air preheater 3, and the reaction gas outlet of the phthalic anhydride reactor 1 is connected with the inlet of the cooler 2 through a pipeline.
The cooler 2 is a two-section gas cooler, the cooler 2 is internally provided with an independent front section heat exchange tube bundle 4 and a back section heat exchange tube bundle 5, an inlet of the front section heat exchange tube bundle 4 is connected with a water inlet pipeline and an outlet of the front section heat exchange tube bundle is connected with a steam pipeline, an inlet of the back section heat exchange tube bundle 5 is connected with an outlet of the air preheater 3 through a pipeline, an outlet of the back section heat exchange tube bundle 5 is connected with an air inlet of the phthalic anhydride reactor 1 through a pipeline, an inlet of the air preheater 3 is connected with an air inlet pipeline, and air enters the back section heat exchange tube bundle 5 after entering the air preheater 3 through the air inlet pipeline for preheating.
The steam preheating device is characterized in that a finned heat exchange tube bundle 6 is arranged inside the air preheater 3, an inlet of the finned heat exchange tube bundle 6 is connected with a steam pipeline and an outlet of the finned heat exchange tube bundle is connected with a liquid drainage pipeline, a steam control valve 7 is arranged on the steam pipeline at the inlet of the finned heat exchange tube bundle 6, an air temperature measuring instrument 8 is arranged on the outlet pipeline of the air preheater 3, the air temperature measuring instrument 8 is electrically connected with the steam control valve 7, and the air temperature measuring instrument 8 controls the steam control valve 7 according to the measured air temperature so as to control the amount of steam entering the finned heat exchange tube bundle 6. A drain valve 9 is arranged on the drain pipeline.
The heat recovery principle is as follows: the phthalic anhydride reaction gas discharged from the bottom of the phthalic anhydride reactor 1 enters a cooler 2, is cooled by a front section heat exchange tube bundle 4 and then by a rear section heat exchange tube bundle 5, and is discharged from an outlet of the cooler 2 to enter a phthalic anhydride condensation recovery system. Boiler water enters the front section heat exchange tube bundle 4 to absorb heat of the reaction gas and then is heated into steam, and the steam enters the steam pipeline for standby; the air enters the rear section heat exchange tube bundle 5 after being preheated by the air preheater 3 to further absorb the heat of the reaction gas, and then the air is heated and enters the phthalic anhydride reactor 1 to directly oxidize the o-xylene, so that the heat of the reaction gas is recycled.
The above-described embodiments are merely preferred and are not intended to limit the present invention in any way, and other variations and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
In the description of the present invention, it is to be understood that the terms indicating orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of description, and do not indicate or imply that the equipment or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
Claims (3)
1. The utility model provides a phthalic anhydride reaction gas heat recovery system, includes phthalic anhydride reactor, cooler, its characterized in that: the reaction gas outlet of the phthalic anhydride reactor is connected with the inlet of the cooler through a pipeline; the cooler is a two-section type gas cooler, an independent front section heat exchange tube bundle and a back section heat exchange tube bundle are arranged inside the cooler, an inlet of the front section heat exchange tube bundle is connected with a water inlet pipeline and an outlet of the front section heat exchange tube bundle is connected with a steam pipeline, an inlet of the back section heat exchange tube bundle is connected with an outlet of an air preheater through a pipeline, an outlet of the back section heat exchange tube bundle is connected with an air inlet of a phthalic anhydride reactor through a pipeline, and an inlet of the air preheater is connected with an air inlet pipeline.
2. The phthalic anhydride reaction gas heat recovery system of claim 1, wherein: the air preheater is characterized in that a finned heat exchange tube bundle is arranged in the air preheater, an inlet of the finned heat exchange tube bundle is connected with a steam pipeline, an outlet of the finned heat exchange tube bundle is connected with a liquid drainage pipeline, a steam control valve is arranged on the steam pipeline at the inlet of the finned heat exchange tube bundle, an air temperature measuring instrument is arranged on the outlet pipeline of the air preheater, and the air temperature measuring instrument is electrically connected with the steam control valve.
3. The phthalic anhydride reaction gas heat recovery system of claim 2, wherein: and a drain valve is arranged on the liquid discharge pipeline.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023095732.3U CN214470297U (en) | 2020-12-21 | 2020-12-21 | Phthalic anhydride reaction gas heat recovery system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023095732.3U CN214470297U (en) | 2020-12-21 | 2020-12-21 | Phthalic anhydride reaction gas heat recovery system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214470297U true CN214470297U (en) | 2021-10-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202023095732.3U Active CN214470297U (en) | 2020-12-21 | 2020-12-21 | Phthalic anhydride reaction gas heat recovery system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214470297U (en) |
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2020
- 2020-12-21 CN CN202023095732.3U patent/CN214470297U/en active Active
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| EE01 | Entry into force of recordation of patent licensing contract | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Lihua Yilijin Clean Energy Co.,Ltd. Assignor: LIHUA YILIJIN REFINERY Co.,Ltd. Contract record no.: X2023980031898 Denomination of utility model: A heat recovery system for phthalic anhydride reaction gas Granted publication date: 20211022 License type: Common License Record date: 20230207 |