CN-224229963-U - Phthalic anhydride tail gas waste heat recovery utilizes system

CN224229963UCN 224229963 UCN224229963 UCN 224229963UCN-224229963-U

Abstract

The application provides a phthalic anhydride tail gas waste heat recycling system which comprises a catalytic oxidation tail gas emission system, a steam generation system, an adjustment switching system and a high Wen Ningshui collection system, wherein the catalytic oxidation tail gas emission system comprises a plurality of tail gas outlet pipelines which are respectively connected with different tail gas outlets of the catalytic oxidation system, the steam generation system is connected with the plurality of tail gas outlet pipelines and is used for evaporating desalted water to form steam by using waste heat of tail gas discharged by the plurality of tail gas outlet pipelines as a heat source, the adjustment switching system is arranged on the plurality of tail gas outlet pipelines and is used for enabling the tail gas to selectively enter the different tail gas outlet pipelines and selectively and directly discharge or enter the steam generation system, and the high Wen Ningshui collection system is connected with the steam generation system and is used for collecting and reutilizing high Wen Ningshui generated by the steam generation system. According to the application, the exhaust path of the tail gas can be flexibly switched according to the changes of the production load and the operation condition, the waste heat in the tail gas can be effectively recovered, and the maximum utilization of the tail gas can be realized.

Inventors

WANG CHUNXIAO
GAO YINGJIE
ZHAO XIANPENG
Yang xinpo
GAO YIBIN
WAN YAKUN
CAO JIANWEI
WANG LE
FAN LEI

Assignees

唐山旭阳化工有限公司

Dates

Publication Date: 20260512
Application Date: 20250506

Claims (10)

1. The phthalic anhydride tail gas waste heat recovery and utilization system is characterized by comprising: The catalytic oxidation exhaust emission system comprises a plurality of exhaust outlet pipelines which are respectively connected with different exhaust outlets of the catalytic oxidation system; the steam generation system is connected with the tail gas outlet pipelines and is used for evaporating desalted water to form steam by using the waste heat of the tail gas discharged by the tail gas outlet pipelines as a heat source; The adjusting and switching system is arranged on the plurality of tail gas outlet pipelines and is used for respectively switching the exhaust paths of the tail gas in the plurality of tail gas outlet pipelines so that the tail gas selectively enters different tail gas outlet pipelines and is selectively and directly discharged or enters the steam generation system; and the high-temperature condensate collection system is connected with the steam generation system and is used for collecting and reutilizing the high Wen Ningshui generated by the steam generation system.
2. The phthalic anhydride tail gas waste heat recovery and utilization system according to claim 1, wherein the catalytic oxidation system comprises a first tail gas outlet and a second tail gas outlet, the catalytic oxidation tail gas emission system comprises a first tail gas outlet pipeline and a second tail gas outlet pipeline, one end of the first tail gas outlet pipeline is connected with the first tail gas outlet, one end of the first tail gas outlet pipeline is connected with the steam generation system, one end of the second tail gas outlet pipeline is connected with the second tail gas outlet, and one end of the second tail gas outlet pipeline is connected with the steam generation system.
3. The phthalic anhydride tail gas waste heat recovery and utilization system according to claim 2, wherein a first exhaust chimney line for connecting with a chimney is connected to the first tail gas outlet line, and a second exhaust chimney line for connecting with a chimney is connected to the second tail gas outlet line.
4. The phthalic anhydride tail gas waste heat recovery and utilization system according to claim 3, wherein the adjustment and switching system comprises a first switching valve, a second switching valve, a third switching valve and a fourth switching valve, the first switching valve is disposed on the first tail gas outlet line, the second switching valve is disposed on the second tail gas outlet line, the third switching valve is disposed on the first exhaust stack line, and the fourth switching valve is disposed on the second exhaust stack line.
5. The phthalic anhydride tail gas waste heat recovery and utilization system according to claim 4, wherein a temperature control point is arranged on the catalytic oxidation system; The third switching valve is an electric control valve; The regulating and switching system further comprises a controller and a detection component for detecting the temperature at the temperature control point, wherein the controller is respectively and electrically connected with the detection component and the third switching valve, and receives the temperature signal of the temperature control point detected by the detection component and controls the opening degree of the third switching valve.
6. The phthalic anhydride tail gas waste heat recovery and utilization system according to claim 3, wherein the steam generation system comprises a steam generator and a desalted water delivery pump, the steam generator comprises a heat exchanger and a steam drum which is arranged at the upper part of the heat exchanger and is connected with the cold fluid side of the heat exchanger, an outlet of the desalted water delivery pump is connected with the steam drum and is used for feeding desalted water into the steam drum, a steam pipeline is connected with the top of the steam drum and is used for feeding steam generated in the steam drum into a steam pipe network, a hot fluid side inlet of the heat exchanger is respectively connected with one end of the first tail gas outlet pipeline and one end of the second tail gas outlet pipeline, and a hot fluid side outlet of the heat exchanger is connected with atmosphere.
7. The phthalic anhydride tail gas waste heat recovery and utilization system according to claim 6, wherein the steam pipeline is provided with a first automatic regulating valve for automatically regulating the opening degree according to the steam pressure of the downstream pipeline, and/or And a second automatic regulating valve is arranged on the desalted water conveying pump.
8. The phthalic anhydride tail gas waste heat recovery and utilization system according to claim 6, wherein the high temperature condensate collection system comprises a high temperature condensate tank, a condensate delivery pump and a desalted water tank, an inlet of the Gao Wenning water tank is connected with a cold fluid side outlet of the heat exchanger, an outlet of the Gao Wenning water tank is connected with an inlet of the condensate delivery pump, an outlet of the condensate delivery pump is connected with an inlet of the desalted water tank, and a raw water pipeline for feeding raw water into the desalted water tank and a water inlet pipeline for feeding water obtained by mixing high temperature condensate and raw water in the desalted water tank into a desalted water treatment system are further connected to the desalted water tank.
9. The phthalic anhydride tail gas waste heat recovery and utilization system according to claim 6, wherein the hot fluid side outlet of the heat exchanger is connected to the first exhaust stack line and the second exhaust stack line, respectively, so that the tail gas after heat exchange by the heat exchanger is exhausted to the atmosphere from the stack.
10. The phthalic anhydride tail gas waste heat recovery and utilization system according to claim 8, wherein the Gao Wenning water tank and the desalted water tank are respectively provided with a liquid level meter for detecting the height of the internal liquid level, and/or The steam generator, the steam pipeline and the high-temperature condensate tank are respectively provided with a measuring element for detecting the internal temperature and the internal pressure.

Description

Phthalic anhydride tail gas waste heat recovery utilizes system Technical Field The application belongs to the technical field of phthalic anhydride production by a naphthalene method, and particularly relates to a phthalic anhydride tail gas waste heat recycling system. Background At present, in the traditional production process of industrial naphthalene phthalic anhydride, phthalic anhydride (phthalic anhydride for short) tail gas separated from a hot melting tank enters a tail gas treatment device for further treatment. In the phthalic anhydride tail gas catalytic oxidation treatment process, organic matters contained in phthalic anhydride tail gas are fully reacted under the action of a catalyst and are converted into substances such as CO 2, H 2 O and the like, the reacted gas is up to about 420 ℃, the high-temperature gas exchanges heat with the preheated tail gas through a heat exchanger, and the temperature is reduced to 220 ℃ and then enters a chimney through a four-way valve to be discharged, so that the problem of heat loss and waste exists. Disclosure of utility model Aiming at the technical problems in the prior art, the embodiment of the application provides a phthalic anhydride tail gas waste heat recycling system, which effectively recovers waste heat in tail gas and realizes the maximum utilization of energy. The technical scheme adopted by the embodiment of the application is that the phthalic anhydride tail gas waste heat recycling system comprises: The catalytic oxidation exhaust emission system comprises a plurality of exhaust outlet pipelines which are respectively connected with different exhaust outlets of the catalytic oxidation system; the steam generation system is connected with the tail gas outlet pipelines and is used for evaporating desalted water to form steam by using the waste heat of the tail gas discharged by the tail gas outlet pipelines as a heat source; The adjusting and switching system is arranged on the plurality of tail gas outlet pipelines and is used for respectively switching the exhaust paths of the tail gas in the plurality of tail gas outlet pipelines so that the tail gas selectively enters different tail gas outlet pipelines and is selectively and directly discharged or enters the steam generation system; and the high-temperature condensate collection system is connected with the steam generation system and is used for collecting and reutilizing the high Wen Ningshui generated by the steam generation system. In an alternative embodiment, the catalytic oxidation system comprises a first tail gas outlet and a second tail gas outlet, the catalytic oxidation tail gas emission system comprises a first tail gas outlet pipeline and a second tail gas outlet pipeline, one end of the first tail gas outlet pipeline is connected with the first tail gas outlet, one end of the first tail gas outlet pipeline is connected with the steam generation system, one end of the second tail gas outlet pipeline is connected with the second tail gas outlet, and one end of the second tail gas outlet pipeline is connected with the steam generation system. In an alternative embodiment, the first exhaust outlet pipeline is connected with a first exhaust chimney pipeline used for being connected with a chimney, and the second exhaust outlet pipeline is connected with a second exhaust chimney pipeline used for being connected with the chimney. In an alternative embodiment, the adjusting and switching system includes a first switching valve, a second switching valve, a third switching valve and a fourth switching valve, where the first switching valve is disposed on the first exhaust outlet pipeline, the second switching valve is disposed on the second exhaust outlet pipeline, the third switching valve is disposed on the first exhaust stack pipeline, and the fourth switching valve is disposed on the second exhaust stack pipeline. In an alternative embodiment, a temperature control point is arranged on the catalytic oxidation system; The third switching valve is an electric control valve; The phthalic anhydride tail gas waste heat recycling system further comprises a controller and a detection component for detecting the temperature at the temperature control point, wherein the controller is respectively and electrically connected with the detection component and the third switching valve, and the controller receives the temperature signal of the temperature control point detected by the detection component and controls the opening degree of the third switching valve. In an alternative embodiment, the steam generation system comprises a steam generator and a desalted water delivery pump, the steam generator comprises a heat exchanger and a steam drum which is arranged on the upper portion of the heat exchanger and connected with the cold fluid side of the heat exchanger, an outlet of the desalted water delivery pump is connected with the steam drum and used for delivering desalted water into