CN112007471A - Method and system for clean treatment and recycling of alkali liquor oxidation regeneration tail gas - Google Patents
Method and system for clean treatment and recycling of alkali liquor oxidation regeneration tail gas Download PDFInfo
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- CN112007471A CN112007471A CN201910461374.6A CN201910461374A CN112007471A CN 112007471 A CN112007471 A CN 112007471A CN 201910461374 A CN201910461374 A CN 201910461374A CN 112007471 A CN112007471 A CN 112007471A
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
- B01D53/04—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography with stationary adsorbents
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/10—Single element gases other than halogens
- B01D2257/102—Nitrogen
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/70—Organic compounds not provided for in groups B01D2257/00 - B01D2257/602
- B01D2257/702—Hydrocarbons
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/80—Water
Abstract
The invention relates to the field of petrochemical gas treatment, and discloses a method and a system for clean treatment and recycling of alkali liquor oxidation regeneration tail gas, wherein the method comprises the following steps: a. the tail gas of the alkali liquor oxidation regeneration tower passes through an adsorption tank filled with an adsorbent from bottom to top to remove N in the tail gas2、H2O and hydrocarbon to obtain oxygen enriched gas; b. after the oxygen concentrated gas is settled and separated from liquid by the oxygen concentrated gas liquid separating tank, the oxygen concentrated gas is boosted by a booster and sent to a gas cooler for cooling; c. mixing the cooled oxygen concentrated gas with external factory air in a mixer to obtain mixed gas; d. returning the mixed gas to an air inlet at the lower part of the alkali liquor oxidation regeneration tower through an online analyzer; e. when the adsorption of the adsorbent in the adsorption tank reaches saturation, the adsorption tank carries out desorption, and the desorbed gas is sent to the gas collecting main pipe of the gas holder. The method and the system can change the condition that the treatment of the alkali liquor oxidation regeneration tail gas is seriously dependent on the combustion treatment of the incinerator or the heating furnace, and realize clean production and flexible arrangement.
Description
Technical Field
The invention relates to the field of petrochemical gas treatment, in particular to a method for cleaning and recycling alkali liquor oxidized and regenerated tail gas and a system for cleaning and recycling alkali liquor oxidized and regenerated tail gas.
Background
In the technological process of liquefied gas sweetening alcohol and gasoline sweetening, alkali liquor is used as an extracting agent, mercaptan in liquefied gas or gasoline is extracted into the alkali liquor, then the alkali liquor is sent to an alkali liquor oxidation regeneration tower for oxidation regeneration, and the regenerated alkali liquor can be recycled, so that the discharge amount of waste alkali is greatly reduced. The oxidation regeneration of alkali liquor needs to consume O2And catalyst, introducing excessive factory air into the alkali liquor oxidation regeneration tower, and under the action of the catalyst, adding sodium mercaptide in the alkali liquor and O in the factory air2Reaction occurs, so that the alkali liquor is regenerated. The residual gas of the reaction comes out from the top of the alkali liquor oxidation regeneration tower and is called tail gas. The pressure of the tail gas is not high, and the tail gas is generally conveyed by using a pipeline made of stainless steel. N is contained in the regenerated tail gas due to the oxidation of alkali liquor2、O2Hydrocarbons and small amounts of water and sulfides, etc., cannot be discharged directly into the atmosphere, nor into the gasholder gas collection system.
At present, in the prior art, a large amount of fuel gas is generally injected into the top of an alkali liquor oxidation regeneration tower or a tail gas pipeline so as to ensure the safety of the tail gas when excessive wind is injected into a factory, and meanwhile, the tail gas is treated by adopting a combustion method. For reasons of economy, land occupation, arrangement and the like, the refinery does not separately configure an incinerator for treating the tail gas at present, and the tail gas is sent to the existing incinerator or heating furnace of the refinery to be burnt. When the distance between the tail gas and the heating furnace is close, the refinery can burn the tail gas and the fuel gas together by using the heating furnace; when the tail gas is close to the incinerator, the refinery can send the tail gas to the incinerator for burning, and at the moment, fuel gas also needs to be supplemented, so that the waste of the fuel gas is caused; when the pressure of tail gas is not enough to be sent to surrounding incinerator or heating furnace, the processing of this tail gas is absorbed in the predicament, and in addition, the pipeline of carrying tail gas is stainless steel, and long distance transport can cause the pipeline expense to increase.
Patent document CN101940872B discloses a method for desulfurizing tail gas by alkali liquor oxidation regeneration of microbubble water washing, microporous membrane separation and sulfide oxidation. Patent document CN104624019B discloses a method for treating tail gas generated by oxidizing and regenerating alkali liquor containing mercaptides, which comprises the following steps: the tail gas containing thiolate alkali liquor to be treated is oxidized and regenerated from the bottom of the water washing tank through a gas distribution plate, enters the water washing tank after being washed with water, is discharged from the top of the water washing tank after being washed with water, enters the dehydration tank from the bottom, is dried and dehydrated through a drying agent, enters the supergravity separator, fully contacts with absorbent diesel, enters the tail gas and diesel separation and recovery tank after being absorbed, and is purified and discharged after oil-gas separation. Patent document CN104789262A provides an energy-conserving emission reduction type desulfurization of oil refinery and three wastes processing integrated equipment and method, wherein tail gas processing apparatus includes tail gas compressor, tail gas cryrogenic unit, tail gas washing tank, tail gas drying cylinder, alkali lye oxidation separating column alkali lye gas stripping tower reaches the top entry of alkali slag oxidation tower all with tail gas compressor side entry is linked together, tail gas compressor side export with tail gas cryrogenic unit side entry is linked together, tail gas cryrogenic unit side export with tail gas washing tank side entry is linked together, tail gas washing tank top export with tail gas drying cylinder side entry is linked together. The methods in the above patent documents are only to desulfurize the exhaust gas, and none of the methods recovers and utilizes the treated exhaust gas.
Disclosure of Invention
In view of the above situation, the present invention provides a method and a system for clean treatment and recycling of alkali lye oxidation regeneration tail gas, which can change the situation that the current alkali lye oxidation regeneration tail gas treatment depends heavily on the combustion treatment of an incinerator or a heating furnace, change the situation that the tail gas treatment consumes fuel gas, avoid the discharge problem caused by the combustion of the tail gas, and simultaneously reduce the length and the amount of stainless steel pipelines for conveying the tail gas, thereby realizing clean production and flexible arrangement.
The first aspect of the invention provides a method for cleaning and recycling alkali liquor oxidation regeneration tail gas, which comprises the following steps:
a. the tail gas of the alkali liquor oxidation regeneration tower passes through an adsorption tank filled with an adsorbent from bottom to top to remove N in the tail gas2、H2O and hydrocarbon to obtain oxygen enriched gas;
b. after the oxygen concentrated gas is settled and separated from liquid through the oxygen concentrated gas liquid separation tank, the oxygen concentrated gas is boosted by a booster and sent to a gas cooler for cooling;
c. mixing the cooled oxygen concentrated gas with external factory air in a mixer to obtain mixed gas;
d. the mixed gas returns to an air inlet at the lower part of the alkali liquor oxidation regeneration tower through an online analyzer;
e. when the adsorption of the adsorbent in the adsorption tank reaches saturation, the adsorption tank carries out desorption, and the desorbed gas is sent to the gas collecting main pipe of the gas holder.
The invention provides a clean treatment and recycling system for tail gas generated by oxidation and regeneration of alkali liquor, which comprises an alkali liquor oxidation regeneration tower, an adsorption tank, an oxygen concentration gas-liquid separation tank, a supercharger, a gas cooler, a mixer and an online analyzer;
the gas outlet of the alkali liquor oxidation regeneration tower is communicated with the gas inlet of the adsorption tank, and a first switch valve is arranged on a connecting pipeline of the alkali liquor oxidation regeneration tower; the gas outlet of the adsorption tank is communicated with the gas inlet of the oxygen concentrated gas liquid separation tank, and a second switch valve is arranged on a connecting pipeline of the adsorption tank; the gas outlet of the adsorption tank is communicated with the gas collecting main pipe of the gas holder, and a third switch valve is arranged on a connecting pipeline of the adsorption tank;
the gas outlet of the oxygen-enriched gas separation tank is communicated with the gas inlet of the supercharger, the gas outlet of the supercharger is communicated with the gas inlet of the gas cooler, and the gas outlet of the gas cooler is communicated with the oxygen-enriched gas inlet of the mixer;
a make-up air inlet of the mixer is communicated with a plant air inlet pipeline;
the outlet of the mixer is communicated with the inlet of the online analyzer, and the outlet of the online analyzer is communicated with the air inlet of the alkali liquor oxidation regeneration tower.
The method and the system for cleanly treating and recycling the alkali liquor oxidation regeneration tail gas have the following beneficial effects:
the alkali liquor oxidation regeneration tail gas enters an adsorption tank, and the adsorption effect of the adsorption bed layer is utilized to obtain O-enriched gas on the top of the adsorption tank2The oxygen concentrated gas is subjected to liquid separation, compression and pressure increaseThe cooling process is sent back to the alkali liquor oxidation regeneration tower to be recycled, so that the air quantity of a supplemented factory can be greatly reduced; desorbing the adsorption tank to obtain N2、H2O, the desorption gas of hydrocarbon, the desorption gas can be directly discharged into a gas collecting main pipe of a gas holder by pipeline or vacuum pump airtight conveying, the device internal treatment of alkali liquor oxidation regeneration tail gas is realized, clean production without external discharge in the environment-friendly treatment process is realized, meanwhile, an incinerator is not required to be configured, the tail gas is not required to be sent to other incinerators or heating furnaces of a refinery for combustion treatment, fuel gas is not consumed, stainless steel pipelines for conveying the tail gas are saved, the problem of furnace smoke emission caused by tail gas combustion is avoided, the current situation that the tail gas treatment is seriously dependent on the incinerator or the heating furnace is changed, and the arrangement is more flexible.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without limiting the invention.
FIG. 1 is a schematic view of a system for cleaning, treating and recycling tail gas generated by oxidation of alkali liquor according to an embodiment of the present invention.
FIG. 2 is a schematic view of a tail gas treatment system for lye oxidation regeneration in the prior art.
Description of the reference numerals
1, oxidizing and regenerating a tower by alkali liquor; 2, an adsorption tank A; 3 oxygen concentration gas liquid separation tank; 4, a supercharger; 5, a gas cooler; 6, a mixer; 7, an online analyzer; 8, an adsorption tank B; 9A first on-off valve α; 9B a second on-off valve α; 9C a third on/off valve α; 10A first on-off valve β; 10B a second on-off valve β; a 10C third switching valve β; 11 a flame arrestor; 12 an incinerator or furnace; 13 gas collecting main pipe of gas holder;
a tail gas; d, factory wind; f fuel gas.
Detailed Description
In order that the present invention may be more readily understood, the following detailed description of the invention is given with reference to the accompanying drawings and embodiments, which are given by way of illustration only and are not intended to limit the invention.
According to a first aspect of the present invention, the present invention provides a method for cleaning and recycling alkali liquor oxidation regeneration tail gas, comprising the following steps:
a. the tail gas of the alkali liquor oxidation regeneration tower passes through an adsorption tank filled with an adsorbent from bottom to top to remove N in the tail gas2、H2O and hydrocarbon to obtain oxygen enriched gas;
b. after the oxygen concentrated gas is settled and separated from liquid through the oxygen concentrated gas liquid separation tank, the oxygen concentrated gas is boosted by a booster and sent to a gas cooler for cooling;
c. mixing the cooled oxygen concentrated gas with external factory air in a mixer to obtain mixed gas;
d. the mixed gas returns to an air inlet at the lower part of the alkali liquor oxidation regeneration tower through an online analyzer;
e. when the adsorption of the adsorbent in the adsorption tank reaches saturation, the adsorption tank carries out desorption, and the desorbed gas is sent to the gas collecting main pipe of the gas holder.
In the invention, the alkali liquor oxidation regeneration tail gas is discharged from the alkali liquor oxidation regeneration tower and sent into an adsorption tank, an adsorbent is filled in the adsorption tank, the tail gas passes through an adsorbent bed layer from bottom to top, and N in the tail gas2、H2O, hydrocarbon, etc. are adsorbed by the adsorbent, and O in the exhaust gas2The tail gas leaves the adsorption tank after passing through the adsorbent bed layer without being adsorbed by the adsorbent, and the obtained gas is oxygen concentrated gas; after the oxygen concentrated gas is settled and separated from liquid by the oxygen concentrated gas liquid separating tank, the oxygen concentrated gas is boosted by a booster and sent to a gas cooler for cooling, the cooled oxygen concentrated gas is mixed with external factory air in a mixer to obtain mixed gas, and the mixed gas returns to an air inlet at the lower part of an alkali liquor oxidation regeneration tower through an online analyzer, so that the oxygen concentration and the reutilization of alkali liquor oxidation regeneration tail gas are realized.
When the adsorbent in the canister reaches saturation, i.e. when N2、H2When the adsorption front of O, hydrocarbon and the like reaches the top of the adsorbent bed of the adsorption tank, the adsorption is stopped, the adsorption tank enters a desorption state, and the adsorbed N is2、H2O, hydrocarbon and the like are discharged into a gas collecting main pipe of the gas holder in a sealed way through a pipeline after decompression and desorption, and the hydrocarbon can be recycled.
In order to improve the treatment and recycling efficiency of the tail gas of the alkali liquor oxidation regeneration tower, the method is suitable for production requirements. Preferably, the adsorption tanks comprise at least two, and at least two adsorption tanks are switched to perform adsorption and desorption alternately.
Further preferably, the adsorption tanks include two adsorption tanks, namely an adsorption tank A and an adsorption tank B, and the method comprises the following steps:
1) introducing tail gas of the alkali liquor oxidation regeneration tower into an adsorption tank A, and treating according to the steps a to d;
2) when the adsorption of the adsorbent in the adsorption tank A reaches saturation, switching the tail gas of the alkali liquor oxidation regeneration tower to an adsorption tank B, desorbing the adsorption tank A, and sending the desorbed gas to a gas cabinet gas collection main pipe;
3) b, switching the tail gas of the alkali liquor oxidation regeneration tower to an adsorption tank B, and then treating according to the steps a to d;
4) when the adsorption of the adsorbent in the adsorption tank B reaches saturation, switching the tail gas of the alkali liquor oxidation regeneration tower to the adsorption tank A, desorbing the adsorption tank B, and sending the desorbed gas to a gas cabinet gas collection main pipe;
5) and (5) circulating the steps 1) to 4) until the alkali liquor oxidation regeneration tail gas is treated.
Preferably, the operating pressure of the canister in the adsorption state is 0.2-0.6 MpaG.
Preferably, the operating pressure of the canister in the desorption state is 0-0.1 MpaG. The desorption pressure of the adsorption tank can be realized by any conventionally used method, for example, the desorption pressure can be realized by sending the desorption gas to the gas holder gas collecting main pipe through a pipeline only, the depressurization desorption of the adsorption tank can be realized, or a vacuum pump can be arranged on a connecting pipeline of the adsorption tank and the gas holder gas collecting main pipe, the desorption gas is pumped out by the vacuum pump and sent to the gas holder gas collecting main pipe, and the depressurization desorption of the adsorption tank can be realized.
Preferably, the pressure difference between the gas inlet and the gas outlet of the supercharger is 0.1-0.5 MPa.
Preferably, the gas outlet temperature of the gas cooler is 40-50 ℃.
According to a preferred embodiment of the present invention, a method for cleaning and recycling tail gas generated by oxidation and regeneration of alkali liquor comprises the following steps:
tail gas of alkali liquor oxidation regeneration tower passes through adsorption tank A filled with adsorbent from bottom to top to remove N in the tail gas2、H2O and hydrocarbon to obtain oxygen enriched gas;
secondly, after the oxygen concentrated gas is settled and separated from liquid through an oxygen concentrated gas liquid separating tank, the oxygen concentrated gas is boosted by a booster and sent to a gas cooler for cooling;
mixing the cooled oxygen concentrated gas with external factory air in a mixer to obtain mixed gas;
returning the mixed gas to an air inlet at the lower part of the alkali liquor oxidation regeneration tower through an online analyzer;
when the adsorption of the adsorbent in the adsorption tank A reaches saturation, switching the tail gas of the alkali liquor oxidation regeneration tower to an adsorption tank B, desorbing the tail gas in the adsorption tank A, and sending the desorbed gas to a gas cabinet gas collection header pipe;
sixthly, after the tail gas of the alkali liquor oxidation regeneration tower is switched to an adsorption tank B, treating according to the steps from the first step to the fourth step;
seventhly, when the adsorption of the adsorbent in the adsorption tank B reaches saturation, the tail gas of the alkali liquor oxidation regeneration tower is switched to the adsorption tank A, the adsorption tank B carries out desorption, and the desorption gas is sent to a gas cabinet gas collection main pipe;
eighthly, the steps from the first step to the seventh step are circulated until the alkali liquor oxidation regeneration tail gas is treated.
According to a second aspect of the invention, the invention provides a clean treatment and recycling system for tail gas generated by oxidation and regeneration of alkali liquor, which comprises an alkali liquor oxidation regeneration tower, an adsorption tank, an oxygen concentration gas liquid separation tank, a supercharger, a gas cooler, a mixer and an online analyzer;
the gas outlet of the alkali liquor oxidation regeneration tower is communicated with the gas inlet of the adsorption tank, and a first switch valve is arranged on a connecting pipeline of the alkali liquor oxidation regeneration tower; the gas outlet of the adsorption tank is communicated with the gas inlet of the oxygen concentrated gas liquid separation tank, and a second switch valve is arranged on a connecting pipeline of the adsorption tank; the gas outlet of the adsorption tank is communicated with the gas collecting main pipe of the gas holder, and a third switch valve is arranged on a connecting pipeline of the adsorption tank;
the gas outlet of the oxygen-enriched gas separation tank is communicated with the gas inlet of the supercharger, the gas outlet of the supercharger is communicated with the gas inlet of the gas cooler, and the gas outlet of the gas cooler is communicated with the oxygen-enriched gas inlet of the mixer;
a make-up air inlet of the mixer is communicated with a plant air inlet pipeline;
the outlet of the mixer is communicated with the inlet of the online analyzer, and the outlet of the online analyzer is communicated with the air inlet of the alkali liquor oxidation regeneration tower.
In order to improve the treatment and recycling efficiency of the tail gas of the alkali liquor oxidation regeneration tower, the method is suitable for production requirements. Preferably, the adsorption tanks comprise an adsorption tank A and an adsorption tank B;
a first switch valve alpha is arranged on a connecting pipeline between a gas outlet of the alkali liquor oxidation regeneration tower and a gas inlet of an adsorption tank A, a second switch valve alpha is arranged on a connecting pipeline between a gas outlet of the adsorption tank A and a gas inlet of the oxygen concentrated gas liquid separation tank, and a third switch valve alpha is arranged on a connecting pipeline between a gas outlet of the adsorption tank A and the gas collecting main pipe of the gas holder;
a first switch valve beta is arranged on a connecting pipeline between a gas outlet of the alkali liquor oxidation regeneration tower and a gas inlet of an adsorption tank B, a second switch valve beta is arranged on a connecting pipeline between a gas outlet of the adsorption tank B and a gas inlet of the oxygen concentrated gas liquid separation tank, and a third switch valve beta is arranged on a connecting pipeline between a gas outlet of the adsorption tank B and the gas collecting main pipe of the gas holder.
In order to improve the desorption efficiency, a vacuum pump is preferably arranged on a connecting pipeline between the third switch valve and the gas holder gas collecting main pipe.
According to a preferred embodiment of the invention, the system for cleaning, treating and recycling the tail gas generated by oxidation and regeneration of the alkali liquor comprises an alkali liquor oxidation regeneration tower, an adsorption tank A, an adsorption tank B, an oxygen concentration gas-liquid separation tank, a supercharger, a gas cooler, a mixer and an online analyzer;
a gas outlet of the alkali liquor oxidation regeneration tower is respectively communicated with a gas inlet of the adsorption tank A and a gas inlet of the adsorption tank B, a first switch valve alpha is arranged on a connecting pipeline between the gas outlet of the alkali liquor oxidation regeneration tower and the gas inlet of the adsorption tank A, and a first switch valve beta is arranged on a connecting pipeline between the gas outlet of the alkali liquor oxidation regeneration tower and the gas inlet of the adsorption tank B; the gas outlets of the adsorption tank A and the adsorption tank B are respectively communicated with the gas inlet of the oxygen concentrated gas liquid separating tank, a second switch valve alpha is arranged on a connecting pipeline of the gas outlet of the adsorption tank A and the gas inlet of the oxygen concentrated gas liquid separating tank, and a second switch valve beta is arranged on a connecting pipeline of the gas outlet of the adsorption tank B and the gas inlet of the oxygen concentrated gas liquid separating tank; the gas outlets of the adsorption tank A and the adsorption tank B are respectively communicated with the gas cabinet gas collecting main pipe, and a third switch valve alpha is arranged on a connecting pipeline of the gas outlet of the adsorption tank A and the gas cabinet gas collecting main pipe; a third switch valve beta is arranged on a connecting pipeline between the gas outlet of the adsorption tank B and the gas collecting main pipe of the gas holder;
the gas outlet of the oxygen-enriched gas separation tank is communicated with the gas inlet of the supercharger, the gas outlet of the supercharger is communicated with the gas inlet of the gas cooler, and the gas outlet of the gas cooler is communicated with the oxygen-enriched gas inlet of the mixer;
a make-up air inlet of the mixer is communicated with a plant air inlet pipeline;
the outlet of the mixer is communicated with the inlet of the online analyzer, and the outlet of the online analyzer is communicated with the air inlet of the alkali liquor oxidation regeneration tower.
According to the invention, the method for cleaning, treating and recycling the alkali liquor oxidation regeneration tail gas can be realized by the system.
The present invention will be described in detail by way of examples.
Examples
This example is provided to illustrate the method and system for clean treatment and recycling of tail gas from lye oxidation regeneration of the present invention.
As shown in figure 1, the invention provides a clean treatment and recycling system for tail gas generated by oxidation and regeneration of alkali liquor, which comprises an alkali liquor oxidation regeneration tower 1, an adsorption tank A2, an adsorption tank B8, an oxygen concentration gas-liquid separation tank 3, a supercharger 4, a gas cooler 5, a mixer 6 and an online analyzer 7;
the gas outlet of the alkali liquor oxidation regeneration tower 1 is respectively communicated with the gas inlets of an adsorption tank A2 and an adsorption tank B8, a first switch valve alpha 9A is arranged on a connecting pipeline between the gas outlet of the alkali liquor oxidation regeneration tower 1 and the gas inlet of an adsorption tank A2, and a first switch valve beta 10A is arranged on a connecting pipeline between the gas outlet of the alkali liquor oxidation regeneration tower 1 and the gas inlet of an adsorption tank B8; the gas outlets of the adsorption tank A2 and the adsorption tank B8 are respectively communicated with the gas inlet of the oxygen concentrated gas liquid separation tank 3, a second switch valve alpha 9B is arranged on a connecting pipeline of the gas outlet of the adsorption tank A2 and the gas inlet of the oxygen concentrated gas liquid separation tank 3, and a second switch valve beta 10B is arranged on a connecting pipeline of the gas outlet of the adsorption tank B8 and the gas inlet of the oxygen concentrated gas liquid separation tank 3; the gas outlets of the adsorption tank A2 and the adsorption tank B8 are respectively communicated with the gas cabinet gas collecting main pipe 13, and a third switch valve alpha 9C is arranged on a connecting pipeline between the gas outlet of the adsorption tank A2 and the gas cabinet gas collecting main pipe 13; a third switch valve beta 10C is arranged on a connecting pipeline between the gas outlet of the adsorption tank B8 and the gas collecting main pipe 13 of the gas holder;
a gas outlet of the oxygen-enriched gas-liquid separation tank 3 is communicated with a gas inlet of the supercharger 4, a gas outlet of the supercharger 4 is communicated with a gas inlet of the gas cooler 5, and a gas outlet of the gas cooler 5 is communicated with an oxygen-enriched gas inlet of the mixer 6;
the make-up air inlet of the mixer 6 communicates with the plant air inlet line;
the outlet of the mixer 6 is communicated with the inlet of the on-line analyzer 7, and the outlet of the on-line analyzer 7 is communicated with the air inlet of the alkali liquor oxidation regeneration tower 1.
A method for clean treatment and recycling of alkali liquor oxidation regeneration tail gas is realized by adopting the system, and specifically comprises the following steps:
firstly, the tail gas a generated in the oxidation and regeneration of the alkali liquor is discharged from an alkali liquor oxidation and regeneration tower 1 and is sent into an adsorption tank A2 through a first switch valve alpha 9A, and at the moment, a first switch valve beta 10A is in a closed state; the adsorbent is filled in an adsorption tank A2, the tail gas passes through the adsorbent bed layer from bottom to top, and N in the tail gas2、H2O, hydrocarbon, etc. are adsorbed by the adsorbent, and O in the exhaust gas2Is not adsorbed by the adsorbent, passes through the adsorbent bed layer and then leaves the adsorption tank A2, and the gas is oxygen enriched gas;
secondly, oxygen concentrated gas from the adsorption tank A2 enters the oxygen concentrated gas liquid separation tank 3 through a second switch valve alpha 9B, at the moment, a third switch valve alpha 9C is in a closed state, and the oxygen concentrated gas is sent to the supercharger 4 after liquid is settled and separated in the oxygen concentrated gas liquid separation tank 3; after the oxygen concentrated gas is boosted by a booster 4, the oxygen concentrated gas enters a gas cooler 5 for cooling;
the cooled oxygen enriched gas enters a mixer 6, and the oxygen enriched gas is mixed with external factory air d in the mixer 6;
the mixed gas at the outlet of the mixer 6 enters an online analyzer 7, and the gas at the outlet of the online analyzer 7 returns to the air inlet at the lower part of the alkali liquor oxidation regeneration tower 1, so that the oxygen concentration and reutilization of the alkali liquor oxidation regeneration tail gas are realized;
when N is present2、H2When the adsorption front of O, hydrocarbon and the like reaches the top end of the adsorbent bed of the adsorption tank A2 (when the adsorption tank A2 is saturated), the adsorption is stopped, the first switch valve alpha 9A, the second switch valve alpha 9B and the third switch valve beta 10C are closed, the third switch valve alpha 9C, the first switch valve beta 10A and the second switch valve beta 10B are opened, the tail gas a is switched to the adsorption tank B8, the adsorption tank A2 enters the desorption operation process, and the adsorbed N is adsorbed2、H2O, hydrocarbon and the like are discharged into a gas collecting main pipe 13 of the gas holder in a closed manner through a pipeline through a third on-off valve alpha 9C by depressurization and desorption;
after the tail gas is switched to the adsorption tank B8, repeating the processes from the first step to the fourth step;
is when N is2、H2When the adsorption front of O, hydrocarbon, etc. reaches the top of the adsorbent bed in the adsorption tank B8 (when the adsorption tank B8 is saturated), adsorption is stopped, and the third switching valve α 9C, the first switching valve β 10A and the second switching valve β 10B are closedWhen the first switch valve alpha 9A, the second switch valve alpha 9B and the third switch valve beta 10C are opened, the tail gas is switched to the adsorption tank A2, and N adsorbed by the adsorption tank B82、H2O, hydrocarbon and the like are hermetically discharged into a gas collecting main pipe 13 of the gas holder through a third switching valve beta 10C through a pipeline;
and eighthly, circulating the steps from the first step to the seventh step until the alkali liquor oxidation regeneration tail gas a is treated.
The adsorption tank A2 is in the adsorption operation process, the adsorption tank B8 is in the desorption operation process, the first switching valve α 9A, the second switching valve α 9B, and the third switching valve β 10C are opened, and the third switching valve α 9C, the first switching valve β 10A, and the second switching valve β 10B are closed.
The tail gas a at the top of the alkali liquor oxidation regeneration tower enters an adsorption tank A2 in the adsorption operation process through a first switch valve alpha 9A to obtain oxygen concentrated gas, the oxygen concentrated gas is subjected to pressure boosting of 0.3MPa through an oxygen concentrated gas liquid separation tank 3 and a supercharger 4 in sequence and then enters a gas cooler 5, and the oxygen concentrated gas enters a mixer 6 after being cooled to 40 ℃; in the mixer, external factory air is supplemented, the factory air and the oxygen concentrated gas are mixed and then enter the online analyzer 7, the gas at the outlet of the online analyzer 7 returns to the air inlet at the lower part of the alkali liquor oxidation regeneration tower 1, the oxygen concentration and the reutilization of the alkali liquor oxidation regeneration tail gas are realized, the oxygen concentrated gas returns to the alkali liquor oxidation regeneration tower 1 for reutilization, and the air volume of the supplemented factory can be reduced by 70%.
The desorbed gas at the top of the adsorption tank B8 in the desorption operation process is hermetically discharged into a gas cabinet gas collecting main pipe 13 through a third switching valve beta 10C through a pipeline, and the desorbed gas is discharged into the gas cabinet gas collecting main pipe for hydrocarbon recycling.
The method of the embodiment does not need to supplement fuel gas, does not consume fuel gas, realizes the internal treatment of the device for regenerating tail gas by oxidizing alkali liquor, has no external discharge in the treatment process, realizes clean production and realizes flexible and safe arrangement.
The system of this embodiment is an independent airtight system, need not rely on burning furnace or heating furnace around, has changed this tail gas treatment and has relied on burning furnace or heating furnace's current situation seriously, has solved the emission problem that the tail gas burning produced, has saved the stainless steel pipeline of carrying this tail gas.
Comparative example 1
This comparative example is illustrative of a prior art caustic oxidation regeneration tail gas treatment process and system that is different from the present invention.
As shown in fig. 2, the system for treating tail gas generated by oxidation and regeneration of alkali lye in the prior art comprises an alkali lye oxidation regeneration tower 1, a flame arrester 11 and an incinerator or heating furnace 12, wherein a gas outlet of the alkali lye oxidation regeneration tower 1 is communicated with a gas inlet of the flame arrester 11, a gas outlet of the flame arrester 11 is connected with a gas inlet of the incinerator or heating furnace 12, a first fuel gas inlet is arranged on a connecting pipeline, a second fuel gas inlet is arranged at the upper part of the alkali lye oxidation regeneration tower 1, and a factory air inlet is arranged at the lower part of the alkali lye oxidation regeneration tower 1.
Factory air d enters the alkali liquor oxidation regeneration tower 1 from a factory air inlet at the lower part of the alkali liquor oxidation regeneration tower 1, fuel gas f enters a second fuel gas inlet at the upper part of the alkali liquor oxidation regeneration tower 1, the fuel gas f and excess air (tail gas a) are mixed and then come out from the top of the tower, and the mixture passes through a flame arrester 11 and then is self-pressed by a pipeline to a nearby incinerator or heating furnace 12 for combustion treatment.
The pipeline for conveying the gas is made of stainless steel and must be accompanied by heat, and the burner for burning the gas is a separately arranged burner. The alkali liquor oxidation regeneration tail gas a is subjected to high-temperature combustion decomposition, and carbon dioxide, water, a small amount of sulfur oxides and the like generated in the combustion process need to be discharged within the range meeting the discharge standard.
Having described embodiments of the present invention, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the illustrated embodiments.
Claims (10)
1. A method for clean treatment and reuse of alkali liquor oxidation regeneration tail gas is characterized by comprising the following steps:
a. the tail gas of the alkali liquor oxidation regeneration tower passes through an adsorption tank filled with an adsorbent from bottom to top to remove N in the tail gas2、H2O and hydrocarbonsTo obtain oxygen concentrated gas;
b. after the oxygen concentrated gas is settled and separated from liquid through the oxygen concentrated gas liquid separation tank, the oxygen concentrated gas is boosted by a booster and sent to a gas cooler for cooling;
c. mixing the cooled oxygen concentrated gas with external factory air in a mixer to obtain mixed gas;
d. the mixed gas returns to an air inlet at the lower part of the alkali liquor oxidation regeneration tower through an online analyzer;
e. when the adsorption of the adsorbent in the adsorption tank reaches saturation, the adsorption tank carries out desorption, and the desorbed gas is sent to the gas collecting main pipe of the gas holder.
2. The method for cleaning and recycling tail gas generated in the oxidation regeneration of alkali liquor according to claim 1, wherein the adsorption tanks comprise at least two adsorption tanks, and at least two adsorption tanks are switched to perform adsorption and desorption alternately.
3. The method for cleaning, treating and recycling tail gas generated by oxidation and regeneration of alkali liquor according to claim 2, wherein the adsorption tanks comprise two adsorption tanks, namely an adsorption tank A and an adsorption tank B, and the method comprises the following steps:
1) introducing tail gas of the alkali liquor oxidation regeneration tower into an adsorption tank A, and treating according to the steps a to d;
2) when the adsorption of the adsorbent in the adsorption tank A reaches saturation, switching the tail gas of the alkali liquor oxidation regeneration tower to an adsorption tank B, desorbing the adsorption tank A, and sending the desorbed gas to a gas cabinet gas collection main pipe;
3) b, switching the tail gas of the alkali liquor oxidation regeneration tower to an adsorption tank B, and then treating according to the steps a to d;
4) when the adsorption of the adsorbent in the adsorption tank B reaches saturation, switching the tail gas of the alkali liquor oxidation regeneration tower to the adsorption tank A, desorbing the adsorption tank B, and sending the desorbed gas to a gas cabinet gas collection main pipe;
5) and (5) circulating the steps 1) to 4) until the alkali liquor oxidation regeneration tail gas is treated.
4. The method for cleaning and recycling alkali lye regeneration tail gas according to claim 1 or 3 wherein the operating pressure of the adsorption tank in the adsorption state is 0.2-0.6 MpaG.
5. The method for cleaning and recycling alkali liquor oxidation regeneration tail gas according to claim 1 or 3, wherein the operating pressure of the adsorption tank in the desorption state is 0-0.1 MpaG.
6. The method for cleaning, treating and recycling alkali liquor oxidation regeneration tail gas according to claim 1, wherein the pressure difference between the gas inlet and the gas outlet of the supercharger is 0.1-0.5 MPa.
7. The method for cleaning, treating and recycling alkali liquor oxidation regeneration tail gas according to claim 1, wherein the gas outlet temperature of the gas cooler is 40-50 ℃.
8. A clean treatment and recycling system for tail gas generated by oxidation and regeneration of alkali liquor is characterized by comprising an alkali liquor oxidation regeneration tower, an adsorption tank, an oxygen concentration gas liquid separation tank, a supercharger, a gas cooler, a mixer and an online analyzer;
the gas outlet of the alkali liquor oxidation regeneration tower is communicated with the gas inlet of the adsorption tank, and a first switch valve is arranged on a connecting pipeline of the alkali liquor oxidation regeneration tower; the gas outlet of the adsorption tank is communicated with the gas inlet of the oxygen concentrated gas liquid separation tank, and a second switch valve is arranged on a connecting pipeline of the adsorption tank; the gas outlet of the adsorption tank is communicated with the gas collecting main pipe of the gas holder, and a third switch valve is arranged on a connecting pipeline of the adsorption tank;
the gas outlet of the oxygen-enriched gas separation tank is communicated with the gas inlet of the supercharger, the gas outlet of the supercharger is communicated with the gas inlet of the gas cooler, and the gas outlet of the gas cooler is communicated with the oxygen-enriched gas inlet of the mixer;
a make-up air inlet of the mixer is communicated with a plant air inlet pipeline;
the outlet of the mixer is communicated with the inlet of the online analyzer, and the outlet of the online analyzer is communicated with the air inlet of the alkali liquor oxidation regeneration tower.
9. The lye oxidation regeneration tail gas clean treatment and reuse system according to claim 8 wherein said adsorption tanks comprise adsorption tank a and adsorption tank B;
a first switch valve alpha is arranged on a connecting pipeline between a gas outlet of the alkali liquor oxidation regeneration tower and a gas inlet of an adsorption tank A, a second switch valve alpha is arranged on a connecting pipeline between a gas outlet of the adsorption tank A and a gas inlet of the oxygen concentrated gas liquid separation tank, and a third switch valve alpha is arranged on a connecting pipeline between a gas outlet of the adsorption tank A and the gas collecting main pipe of the gas holder;
a first switch valve beta is arranged on a connecting pipeline between a gas outlet of the alkali liquor oxidation regeneration tower and a gas inlet of an adsorption tank B, a second switch valve beta is arranged on a connecting pipeline between a gas outlet of the adsorption tank B and a gas inlet of the oxygen concentrated gas liquid separation tank, and a third switch valve beta is arranged on a connecting pipeline between a gas outlet of the adsorption tank B and the gas collecting main pipe of the gas holder.
10. The system for the clean treatment and the recycling of the alkali liquor oxidation regeneration tail gas according to claim 8, wherein a vacuum pump is arranged on a connecting pipeline between the third switch valve and the gas tank gas collecting main pipe.
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