CN106474879B - Acrylonitrile tail gas centralized discharge system and acrylonitrile tail gas centralized discharge method - Google Patents
Acrylonitrile tail gas centralized discharge system and acrylonitrile tail gas centralized discharge method Download PDFInfo
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- CN106474879B CN106474879B CN201510532304.7A CN201510532304A CN106474879B CN 106474879 B CN106474879 B CN 106474879B CN 201510532304 A CN201510532304 A CN 201510532304A CN 106474879 B CN106474879 B CN 106474879B
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Abstract
The invention relates to an acrylonitrile tail gas centralized discharge system. The concentrated exhaust system of acrylonitrile tail gas includes: the device comprises a tail gas buffer tank, a tail gas exhaust system, a tail gas collecting pipeline and a tail gas discharging pipeline. The tail gas of the acrylonitrile device is intensively conveyed to a tail gas buffer tank by utilizing a tail gas collecting pipeline; and the tail gas in the tail gas buffer tank is conveyed to a subsequent device through a tail gas exhaust pipeline by utilizing a tail gas pumping system.
Description
Technical Field
The invention relates to a system and a method for collecting and intensively discharging tail gas of an acrylonitrile device.
Background
In the process for producing acrylonitrile by catalytic oxidation of propylene, the main Off-Gas is process Off-Gas discharged from the top of the absorber, i.e., absorber Off-Gas (AOG). In the tail gas of the absorption column, besides the main component nitrogen, non-methane hydrocarbons (CH x ) Carbon monoxide, carbon dioxide, nitrogen Oxides (NO) x ) And a small amount of pollutants such as acrylonitrile, which are one of the main pollution generated in the petrochemical industry.
In the aspect of treating tail gas of the absorption tower, the tail gas is directly vented in early stage. Along with the increasingly strict environmental protection requirements in recent years, the tail gas is basically and properly treated, and the treatment method mainly comprises thermal incineration and catalytic incineration.
In addition to the absorber tail gas, the acrylonitrile device contains a large amount of unstructured exhaust gas, mainly including the breathing gas of the storage tank, the exhaust gas of the vacuum pump, and the like (hereinafter referred to as other tail gases). Most of the current treatment methods for these gases are in-situ blowdown after chilled water washing. Although the content of organic matters in other tail gases is reduced to a certain extent after the tail gases are washed, the tail gases treated by the washing method cannot be directly discharged after the tail gases are subjected to the washing method along with the improvement of environmental protection standards; and unstructured in-situ venting is also detrimental to management. On the other hand, if the device for treating other exhaust gas is separately provided, it occupies a certain space in addition to the cost increase.
Therefore, if the tail gas of the absorption tower and other tail gases can be collected, treated and discharged in a concentrated way, the pollution to the environment can be reduced, and the cost can be saved.
Disclosure of Invention
The invention aims to provide a centralized exhaust system and a centralized exhaust method for tail gas of an acrylonitrile device.
An aspect of the present disclosure provides an acrylonitrile tail gas centralized emission system, including: the device comprises a tail gas buffer tank, a tail gas exhaust system, a tail gas collecting pipeline and a tail gas discharging pipeline.
Preferably, the exhaust gas extraction system comprises a vacuum pump.
Preferably, the compression ratio of the vacuum pump is 1.05 to 5.
Preferably, the compression ratio of the vacuum pump is 1.1 to 2.
Preferably, the acrylonitrile tail gas centralized emission system of the present invention further comprises: a low-temperature water adding pipeline for adding low-temperature washing water into the tail gas buffer tank; a low temperature water discharge pipe for discharging low temperature washing water in the tail gas buffer tank; and a tail gas emptying pipeline for emptying the washed tail gas.
Preferably, the acrylonitrile tail gas centralized discharge system of the present invention further comprises a pump-down detection system connected to the tail gas suction system, the low-temperature water addition pipe, the low-temperature water discharge pipe, and the tail gas blow-down pipe, and generating signals to the controllers of the switching valves of the low-temperature water addition pipe, the low-temperature water discharge pipe, and the tail gas blow-down pipe to open or close the switching valves of the low-temperature water addition pipe, the low-temperature water discharge pipe, and the tail gas blow-down pipe.
Preferably, in the acrylonitrile tail gas concentrated emission system of the present invention, the temperature of the low-temperature water added through the low-temperature water adding pipe is 5 to 30 ℃.
Another aspect of the present invention provides a concentrated exhaust method of acrylonitrile tail gas, the method comprising the steps of:
the tail gas of the acrylonitrile device is intensively conveyed to a tail gas buffer tank by utilizing a tail gas collecting pipeline; and
and conveying the tail gas in the tail gas buffer tank to a subsequent device through a tail gas discharge pipeline by utilizing a tail gas pumping system.
Preferably, the exhaust gas extraction system comprises a vacuum pump.
Preferably, the compression ratio of the vacuum pump is 1.05 to 5.
Preferably, the compression ratio of the vacuum pump is 1.1 to 2.
Preferably, the method for intensively discharging the acrylonitrile tail gas further comprises the following steps:
when the tail gas exhaust system fails, opening a tail gas emptying pipeline, a low-temperature water adding pipeline and a low-temperature water discharging pipeline;
adding low-temperature washing water into the tail gas buffer tank from the low-temperature water adding pipeline, and discharging tail gas from the tail gas emptying pipeline; and
and discharging the low-temperature washing water from the low-temperature water discharge pipeline into a downstream sewage discharge pipeline.
Preferably, in the method for concentrated exhaust of acrylonitrile tail gas according to the present invention, the temperature of the low-temperature water added through the low-temperature water adding pipe is 5 to 30 ℃.
According to the tail gas centralized emission system provided by the invention, the technical problems can be solved, namely that the traditional washing method cannot meet the increasingly-improved environmental protection requirement.
Drawings
Fig. 1 is a process flow diagram of a first embodiment of the acrylonitrile unit exhaust gas concentrated emission system of the present invention.
Fig. 2 is a process flow diagram of a second embodiment of the acrylonitrile unit exhaust gas concentrated emission system of the present invention.
Fig. 3 is a process flow diagram of a third embodiment of the acrylonitrile unit exhaust gas concentrated emission system of the present invention.
List of reference numerals
1. Tail gas buffer tank
2. Tail gas exhaust system
3. Tail gas collecting pipeline
4. Exhaust gas discharge pipeline
5. Tail gas emptying pipeline
6. Low-temperature water adding pipeline
7. Low-temperature water discharge pipeline
8. Switching valve for low-temperature water discharge pipeline
9. Pump stopping detection system
10. Tail gas emptying pipeline switching valve
11. Pipeline switching valve is added to low temperature water
Detailed Description
The system for intensively collecting and discharging the tail gas of the acrylonitrile device of the present invention will be described in detail with reference to the accompanying drawings.
[ first embodiment ]
The invention discloses an acrylonitrile device tail gas centralized discharge system I, which comprises a tail gas buffer tank 1, a tail gas pumping system 2, a tail gas collecting pipeline 3 and a tail gas discharging pipeline 4. The tail gas collecting pipe 3 is connected to the tail gas outlets of the devices such as the top of the absorption tower, the storage tank, the vacuum pump and the like via a plurality of pipelines (not shown), so that the tail gas of the acrylonitrile device which is originally discharged in an unstructured manner is intensively fed into the tail gas buffer tank 1. After the exhaust gas is buffered in the exhaust gas buffer tank 1, the buffered exhaust gas in the exhaust gas buffer tank 1 is transported to a subsequent device (not shown) by the exhaust gas extraction system 2 via the exhaust gas discharge pipe 4 and the exhaust gas extraction system 2.
The materials for manufacturing the exhaust buffer tank 1, the exhaust collection pipe 3, and the exhaust discharge pipe 4 are not particularly limited as long as they are materials commonly used in the art. Specific examples of the exhaust gas extraction system 2 include, but are not limited to, vacuum pumps and the like. The compression ratio of the vacuum pump is 1.05 to 5, preferably 1.1 to 2. The subsequent device can be a device for degrading or other treating the acrylonitrile tail gas, such as a thermal incinerator, a catalytic incinerator and the like, or can be a quenching tower, an absorption tower and the like for reabsorbing a small amount of acrylonitrile and other components in the tail gas. In general, the concentrated collected tail gas is preferably sent to an absorber for re-absorption. When certain problems occur, such as the pressure of the absorption tower is too high to convey the tail gas to the absorption tower, the tail gas is conveyed to an incinerator for incineration.
[ second embodiment ]
A second embodiment of the acrylonitrile unit exhaust gas concentrated exhaust system of the present invention will be described below with reference to fig. 2. The same components in the second embodiment as those in the first embodiment are denoted by the same reference numerals as in the first embodiment, and the description thereof is omitted.
As shown in fig. 2, the tail gas centralized discharge system II of the acrylonitrile device comprises a tail gas buffer tank 1, a tail gas exhaust system 2, a tail gas collecting pipeline 3, a tail gas discharge pipeline 4, a tail gas discharge pipeline 5, a low-temperature water adding pipeline 6, a low-temperature water discharge pipeline 7, a tail gas discharge pipeline switching valve 10, a low-temperature water adding pipeline switching valve 11 and a low-temperature water discharge pipeline switching valve 8.
In the case where the exhaust gas concentrated exhaust system is operating normally, the exhaust gas of the acrylonitrile unit is sent to the unit for degradation or treatment as described in the first embodiment. And when the exhaust gas extraction system 2 fails, the exhaust gas exhaust pipe switching valve 10, the low-temperature water addition pipe switching valve 11 and the low-temperature water discharge pipe switching valve 8 are operated to open the exhaust gas exhaust pipe 5, the low-temperature water addition pipe 6 and the low-temperature water discharge pipe 7. Low-temperature washing water is added from a low-temperature water adding pipeline 6 to the tail gas buffer tank 1 to wash the tail gas. And (5) discharging the washed tail gas from the tail gas discharging pipeline 5. Subsequently, the low-temperature washing water is discharged from the low-temperature water discharge pipe 7 into a downstream sewage pipe (not shown).
When the temperature of the low-temperature washing water exceeds 30 c, the absorption rate of organic matters is lowered. And when the temperature is lower than 5 ℃, the pipeline is frozen. Therefore, the temperature of the low-temperature washing water is preferably 5 to 30 ℃.
After the exhaust gas extraction system 2 has failed, the pump stop signal is released. The exhaust gas vent line switching valve 10, the low-temperature water addition line switching valve 11, and the low-temperature water discharge line switching valve 8 are operated to close the exhaust gas vent line 5, the low-temperature water addition line 6, and the low-temperature water discharge line 7. Thereby resuming the exhaust from the exhaust gas discharge conduit to the subsequent device via the exhaust gas extraction system.
[ third embodiment ]
A third embodiment of the acrylonitrile unit exhaust gas concentrated exhaust system of the present invention will be described below with reference to fig. 3. The same components in the third embodiment as those in the first and second embodiments are denoted by the same reference numerals as in the first and second embodiments, and descriptions thereof are omitted.
As shown in fig. 3, the system III for centralized exhaust of acrylonitrile device includes a tail gas buffer tank 1, a tail gas exhaust system 2, a tail gas collecting pipe 3, a tail gas discharging pipe 4, a tail gas discharging pipe 5, a low-temperature water adding pipe 6, a low-temperature water discharging pipe 7, a water storage structure 8, a pump stopping detection system 9, a tail gas discharging pipe switching valve 10, a low-temperature water adding pipe switching valve 11 and a low-temperature water discharging pipe switching valve 8. The pump stop detection system 9 is connected to the air pump of the exhaust gas extraction system 2. In addition, the pump-stop detection system 9 is also connected to the exhaust gas discharge pipe switching valve 10, the low-temperature water addition pipe switching valve 11, and the low-temperature water discharge pipe switching valve 8, and sends control signals to the controllers of the above three valves to open and then close the above valves.
In the case where the exhaust gas concentrated exhaust system is operating normally, the exhaust gas of the acrylonitrile unit is sent to the unit for degradation or treatment as described in the first embodiment. And when the tail gas pumping system 2 fails, the air pump sends a pump stopping signal to the pump stopping detection system 9. After detecting the pump-off signal, the pump-off detection system 9 issues a command to the controllers of the exhaust gas vent pipe switching valve 10, the low-temperature water addition pipe switching valve 11, and the low-temperature water discharge pipe switching valve 8, opening the exhaust gas vent pipe 5, the low-temperature water addition pipe 6, and the low-temperature water discharge pipe 7. Low-temperature washing water is added into the tail gas buffer tank 1 from a low-temperature water adding pipeline 6, and tail gas is discharged from a tail gas discharging pipeline 5. Subsequently, the low-temperature washing water is discharged from the low-temperature water discharge pipe 7 into a downstream sewage pipe (not shown).
After the exhaust gas extraction system 2 has failed, the pump stop signal is released. The pump-stop detection system 9 issues a command to the controllers of the exhaust gas vent line switching valve 10, the low-temperature water addition line switching valve 11, and the low-temperature water discharge line switching valve 8 to close the exhaust gas vent line 5, the low-temperature water addition line 6, and the low-temperature water discharge line 7. Thereby resuming the exhaust from the exhaust gas discharge conduit to the subsequent device via the exhaust gas extraction system.
According to the acrylonitrile tail gas centralized discharge system, the tail gas of the acrylonitrile device can be discharged in a centralized manner, the pollution of the acrylonitrile device to the environment is reduced or even eliminated, and the tail gas treatment cost is reduced.
The acrylonitrile off-gas concentrated discharge device of the present invention has been described in accordance with the specific embodiments, but the present invention is not limited thereto, and the components constituting the acrylonitrile off-gas concentrated discharge device may be modified or improved according to the actual circumstances.
Claims (5)
1. An acrylonitrile off-gas centralized discharge system comprising:
a tail gas buffer tank;
the tail gas collecting pipeline is used for collecting tail gas generated at each position and conveying the tail gas into the tail gas buffer tank;
a tail gas exhaust pipe;
the tail gas extraction system is used for extracting tail gas in the tail gas buffer tank through the tail gas exhaust pipeline so as to convey the tail gas to a subsequent device, wherein the tail gas extraction system comprises a vacuum pump;
a low-temperature water adding pipeline for adding low-temperature washing water into the tail gas buffer tank;
a low temperature water discharge pipe for discharging low temperature washing water in the tail gas buffer tank;
the tail gas emptying pipeline is used for emptying the washed tail gas; and
and the pump stopping detection system is connected to the tail gas air extraction system, the low-temperature water adding pipeline, the low-temperature water discharging pipeline and the tail gas emptying pipeline, and generates signals to the controllers of the switching valves of the low-temperature water adding pipeline, the low-temperature water discharging pipeline and the tail gas emptying pipeline so as to open or close the switching valves of the low-temperature water adding pipeline, the low-temperature water discharging pipeline and the tail gas emptying pipeline.
2. The acrylonitrile tail gas centralized discharge system according to claim 1, wherein the compression ratio of the vacuum pump is 1.05-5.
3. The acrylonitrile tail gas concentrated exhaust system according to claim 2, wherein the compression ratio of the vacuum pump is 1.1-2.
4. The acrylonitrile off-gas concentrated exhaust system according to any one of claims 1 to 3, wherein the temperature of the low-temperature water added through the low-temperature water adding pipe is 5 to 30 ℃.
5. An acrylonitrile off-gas concentrated emission method using the acrylonitrile off-gas concentrated emission system according to any one of claims 1 to 4, comprising the steps of:
the tail gas of the acrylonitrile device is intensively conveyed to a tail gas buffer tank by utilizing a tail gas collecting pipeline; and
the tail gas in the tail gas buffer tank is conveyed to a subsequent device by a tail gas exhaust pipeline through a tail gas exhaust system, wherein,
when the tail gas exhaust system fails, opening a tail gas emptying pipeline, a low-temperature water adding pipeline and a low-temperature water discharging pipeline to add low-temperature washing water from the low-temperature water adding pipeline to the tail gas buffer tank, washing the tail gas, discharging the washed tail gas from the tail gas emptying pipeline, and discharging the low-temperature washing water from the low-temperature water discharging pipeline to a downstream sewage discharging pipeline.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510532304.7A CN106474879B (en) | 2015-08-26 | 2015-08-26 | Acrylonitrile tail gas centralized discharge system and acrylonitrile tail gas centralized discharge method |
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| CN201510532304.7A CN106474879B (en) | 2015-08-26 | 2015-08-26 | Acrylonitrile tail gas centralized discharge system and acrylonitrile tail gas centralized discharge method |
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| CN106474879B true CN106474879B (en) | 2023-09-29 |
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