CN214715457U - Sequencing batch type VOCs gas deep treatment device - Google Patents
Sequencing batch type VOCs gas deep treatment device Download PDFInfo
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- CN214715457U CN214715457U CN202120521645.5U CN202120521645U CN214715457U CN 214715457 U CN214715457 U CN 214715457U CN 202120521645 U CN202120521645 U CN 202120521645U CN 214715457 U CN214715457 U CN 214715457U
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Abstract
The utility model provides a gaseous advanced treatment unit of formula VOCs of preface batch, including the buffer tank, compressor unit and first heat exchanger, the exit end intercommunication of gas filter and buffer tank is passed through to compressor unit's entrance point, compressor unit's exit end intercommunication has vapour and liquid separator, vapour and liquid separator's liquid phase exit end intercommunication has the storage tank, vapour and liquid separator's gaseous phase exit end and the hot-fluid entrance point intercommunication of first heat exchanger, the hot-fluid exit end intercommunication at first heat exchanger has coalescence filter and the knockout drum that is used for saving the liquefied condensate, coalescence filter's exit end intercommunication has membrane separation unit, membrane separation unit's inlet end intercommunication has the adsorption unit, exit end intercommunication at the adsorption unit has the oxidation unit, the exit end intercommunication of oxidation unit has the aiutage. The device utilizes conventional oil gas recovery technology under high pressure state, reaches after setting pressure, and the wholesale discharges to terminal oxidation technology section, carries out discharge to reach standard after the oxidation treatment, has reached milligram level and has discharged the index.
Description
Technical Field
The utility model relates to a gaseous recovery technical field of VOCs, especially a gaseous advanced treatment unit of sequencing batch formula VOCs.
Background
At present, aiming at the condition that the exhaust emission index reaches the milligram level standard requirement, a condensation process, an adsorption process, an absorption process, an oxidation process (catalytic oxidation/thermal storage catalytic oxidation) and the like are widely applied in the VOCs gas treatment industry, and a combined treatment process is often adopted for the VOCs gas with higher concentration.
The conventional combined process adopts low-pressure condensation or condensation plus adsorption process as pretreatment, the terminal adopts oxidation process, and the process after treatment reaches the latest milligram level emission index at present, but the process has the problems that the condensation temperature is lower, the temperature is low to about-75 ℃ at normal pressure, and a condensing unit has poor operation stability, insufficient condensation temperature, defrosting and defrosting, refrigerant leakage and the like; the fluctuation of the inlet air concentration brings the safety problem of the subsequent oxidation process, the VOCs concentration control of the inlet air is stabilized in the required range for the process flow of the terminal oxidation treatment, and the method is very important.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that to prior art not enough, provide a reasonable in design, safe and reliable, be convenient for tail gas discharge to reach standard's sequencing batch formula VOCs gaseous advanced treatment unit.
The technical problem to be solved by the utility model is realized through the following technical scheme. The utility model relates to a gaseous advanced treatment unit of sequencing batch formula VOCs, the device includes the buffer tank that is used for splendid attire VOCs gas, be used for carrying out the compressor unit that steps up to VOCs gas and be used for carrying out the first heat exchanger that cools down to VOCs gas, the entrance point and the gaseous collection pipeline of outside VOCs of buffer tank communicate, the entrance point of compressor unit passes through gas filter and communicates with the exit end of buffer tank, the exit end intercommunication of compressor unit has vapour and liquid separator, vapour and liquid phase exit end intercommunication of vapour and liquid separator has the storage tank, vapour and liquid outlet end and the hot-fluid entrance point of first heat exchanger of vapour and liquid separator communicate and have the coalescence filter that is used for not condensing high-pressure gas to handle and the knockout drum that is used for storing the liquefied condensate, the exit end intercommunication of coalescence filter has membrane separation unit, membrane separation unit's inlet end intercommunication has the absorption unit, the outlet end of the adsorption unit is communicated with an oxidation unit, the outlet end of the oxidation unit is communicated with an exhaust funnel, and the permeation end of the membrane separation unit is communicated with the inlet end of the compressor unit through a backflow pipeline.
The utility model discloses the technical problem that will solve can also further realize through following technical scheme, to above the gaseous advanced treatment unit of sequencing batch formula VOCs, still communicate the by pass line of avoiding compressor unit empty taking out at the exit end of compressor unit and the entrance point of compressor unit.
The utility model discloses the technical problem that solve can also further realize through following technical scheme, to above the gaseous advanced treatment unit of sequencing batch formula VOCs, all communicate on the backflow pipeline and have the vacuum pump.
The utility model discloses the technical problem that will solve can also further realize through following technical scheme, to above the gaseous advanced treatment unit of sequencing batch formula VOCs, the cold entrance point and the cold exit end of first heat exchanger communicate with outside cooling water set respectively.
The utility model discloses the technical problem that will solve can also further realize through following technical scheme, to above the gaseous advanced treatment unit of sequencing batch formula VOCs, the adsorption unit is provided with 2, 2 parallelly connected settings of adsorption unit.
The utility model discloses the technical problem that will solve can also further realize through following technical scheme, to above the gaseous advanced treatment unit of sequencing batch formula VOCs, there is urgent unloading branch road at the exit end intercommunication of buffer tank.
The utility model discloses the technical problem that solve can also further realize through following technical scheme, to above the gaseous advanced treatment unit of sequencing batch formula VOCs, the coalescence filter passes through the hot-fluid outlet end intercommunication of heated tube and first heat exchanger, and the winding has the electric tracing area on heated tube.
The utility model discloses the technical problem that solve can also further realize through following technical scheme, to above the gaseous advanced treatment unit of sequencing batch formula VOCs still install the relief stabilizer valve on the pipeline of the exit end of absorption unit and the intercommunication between the oxidation unit.
The utility model discloses the technical problem that will solve can also further realize through following technical scheme, to above the gaseous advanced treatment unit of sequencing batch formula VOCs, still be provided with the second heat exchanger between oxidation unit and adsorption unit, the exit end of adsorption unit and the cold entrance point intercommunication of second heat exchanger, the cold exit end of second heat exchanger and the entrance point intercommunication of oxidation unit, the exit end of oxidation unit and the hot entrance point intercommunication of second heat exchanger, the hot exit end and the aiutage intercommunication of second heat exchanger.
Compared with the prior art, the utility model discloses a setting through compressor unit, first heat exchanger, membrane separation unit, adsorption unit and oxidation unit carries out high-pressure technology, shallow cold technology, membrane separation technology, adsorption technology and oxidation technology and combines organically, can carry out high-efficient processing with the VOCs gaseous component in the VOCs mist of collecting, realizes the purpose that the tail gas discharge to reach standard, has good social; moreover, the device can realize integrated skid-mounted layout structurally, realizes four-phase efficient collocation technically, integrates multiple advantages of high efficiency, stability and compact structure, and accords with the trend of future VOCs gas treatment. The device combines multiple process flows, utilizes the conventional oil gas recovery process under the high-pressure state, VOCs gas continuously enters the processing unit, and after reaching the set pressure, the VOCs gas is discharged to the terminal oxidation process section in batches, and the process of standard discharge after oxidation treatment comprehensively considers multiple effects of economic benefit of material recovery, environmental protection benefit of standard discharge and safety benefit of the tail end oxidation treatment process.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the drawings of the present invention are combined to clearly and completely describe the technical solutions in the embodiments of the present invention, and obviously, the described embodiments are some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Referring to fig. 1, a sequencing batch type advanced treatment device for VOCs gas comprises a buffer tank 1 for containing VOCs gas, a compressor set 3 for boosting the VOCs gas and a first heat exchanger 5 for cooling the VOCs gas, wherein an inlet end of the buffer tank 1 is communicated with an external VOCs gas collecting pipeline 2 for storing and buffering the collected VOCs gas, and the VOCs gas stays for a sufficient time before being output, so that the VOCs gas in the buffer tank 1 is stable;
the inlet end of the compressor unit 3 is communicated with the outlet end of the buffer tank 1 through a gas filter, and the gas filter is used for removing micro particle impurities in the gas; the outlet end of the compressor unit 3 is communicated with a gas-liquid separator 4 for carrying out gas-liquid separation on gas, the liquid phase outlet end of the gas-liquid separator 4 is communicated with a storage tank 7 for storing liquefied liquid of the easily condensable component, and the gas phase outlet end of the gas-liquid separator 4 is communicated with the hot fluid inlet end of the first heat exchanger 5 for sending the non-condensable gas into the first heat exchanger 5 for cooling treatment;
a coalescence filter for processing noncondensable high-pressure gas and a liquid separation tank 8 for storing liquefied condensate are communicated with the hot fluid outlet end of the first heat exchanger 5, the high-pressure mixed gas is very easy to liquefy after the temperature is reduced, and the condensate enters the liquid separation tank 8 for storage; the outlet end of the coalescence filter is communicated with a membrane separation unit 6, the air inlet end of the membrane separation unit 6 is communicated with an adsorption unit 9, the outlet end of the adsorption unit 9 is communicated with an oxidation unit 12, the outlet end of the oxidation unit 12 is communicated with an exhaust funnel 13, and the permeation end of the membrane separation unit 6 is communicated with the inlet end of a compressor unit 3 through a return pipeline 10. The membrane separation unit 6 adopts a gas separation membrane, and the gas separation membrane and the adsorption unit 9 are both matched with a vacuum pump 11; the first heat exchanger 5 adopts a tube-shell type first heat exchanger 5 in the prior art; the device adopts an integral structure, can be assembled detachably and is convenient for being fixedly placed on site as required;
the oxidation unit 12 adopts an oxidation reactor in the prior art and is used for oxidizing and decomposing organic molecules which are not treated in the previous process into carbon dioxide and water, and the carbon dioxide and the water are discharged after reaching standards; in the oxidation unit 12, the tail gas is completely pyrolyzed under the action of a catalyst or high temperature to produce harmless gas CO2+H2And O, releasing reaction heat, and discharging the purified gas after reaction to the atmosphere after heat exchange and temperature reduction by the second heat exchanger 14 through the exhaust funnel 13.
In order to avoid the air pumping of the compressor unit 3, a bypass pipeline is arranged at the outlet end of the compressor unit 3 and communicated with the inlet end of the compressor unit 3, so that the safety is guaranteed.
The return pipeline 10 is communicated with a vacuum pump 11, which is convenient for further improving power and efficiency of the gas separation membrane and the adsorption unit 9 and is also convenient for improving the return speed of the liquid in the return pipeline 10.
The cold inlet end and the cold outlet end of the first heat exchanger 5 are respectively communicated with an external water chilling unit, and the cold source adopts low-temperature circulating cryogen, so that circulation is facilitated between the cold chamber of the first heat exchanger 5 and the external water chilling unit, and therefore the boosted mixed gas entering the first heat exchanger 5 can be subjected to heat exchange and cooling treatment.
The number of the adsorption units 9 is 2, and the 2 adsorption units 9 are arranged in parallel and matched with each other, so that the pressure of each adsorption unit 9 for independent adsorption is reduced, and the adsorption efficiency is improved; the adsorption unit 9 adopts an adsorber in the prior art, the adsorber is equipment filled with an adsorbent to realize gas-solid adsorption and desorption, and the adsorbent adopts activated carbon.
An outlet end of the buffer tank 1 is communicated with an emergency emptying branch for use in emergency, so that safety is guaranteed.
The coalescence filter is communicated with a hot fluid outlet end of the first heat exchanger 5 through a heating pipeline, and an electric tracing band is wound on the heating pipeline. The electric tracing band is used for heating and warming noncondensable high-pressure gas input to the coalescing filter through the first heat exchanger 5, so that the moving speed of the gas is improved, the filtering of the coalescing filter is facilitated, the subsequent adsorption unit 9 is facilitated to carry out adsorption treatment, and the efficiency is improved.
A second heat exchanger 14 is further arranged between the oxidation unit 12 and the adsorption unit 9, the outlet end of the adsorption unit 9 is communicated with the cold inlet end of the second heat exchanger 14, the cold outlet end of the second heat exchanger 14 is communicated with the inlet end of the oxidation unit 12, the outlet end of the oxidation unit 12 is communicated with the hot inlet end of the second heat exchanger 14, and the hot outlet end of the second heat exchanger 14 is communicated with the exhaust funnel 13. A fan 15 is also communicated between the outlet end of the adsorption unit 9 and the cold inlet end of the second heat exchanger 14, and is used for further improving the flowing speed of the gas and improving the efficiency.
A decompression stabilizing valve is further mounted on a pipeline communicated between the outlet end of the adsorption unit 9 and the oxidation unit 12, the inlet air of the oxidation unit 12 comes from a discharge pipeline of the adsorption unit 9, the inlet air is controlled by the decompression stabilizing valve, and the oxidation unit can be opened after reaching a set pressure, so that sequencing batch processing is realized.
A high-pressure shallow-cooling combined VOCs gas recovery method comprises the following steps:
(1) the VOCs mixed gas enters a buffer tank 1 for temporary storage after being collected by a pipeline;
(2) the buffer tank 1 inputs the mixed gas into a gas filter, the gas filter filters out tiny particle impurities and then sends the gas to a compressor set 3 for boosting, the boosted mixed gas enters a gas-liquid separator 4, and the easily condensed components are liquefied and then temporarily stored in a storage tank 7;
(3) after removing condensed water from the mixed gas by a gas-liquid separator 4, the mixed gas enters a first heat exchanger 5 for cooling, condensed liquid generated by liquefaction enters a liquid separation tank 8 for storage, uncondensed high-pressure gas enters a coalescing filter, a small amount of oil mist droplets are removed by the coalescing filter, and the gas enters a membrane separation unit 6;
(4) after being treated by the membrane separation unit 6, VOCs molecules migrating at a low speed pass through a backflow pipeline 10 to the compressor unit 3, and mixed gas of VOCs migrating at a high speed and with low concentration enters an adsorption unit 9, and is sent to an oxidation unit 12 after being deeply adsorbed;
(5) the mixed gas after oxidative decomposition is sent to an exhaust funnel 13 for standard emission.
Claims (9)
1. The utility model provides a gaseous advanced treatment unit of sequencing batch formula VOCs which characterized in that: the device comprises a buffer tank for containing VOCs gas, a compressor set for boosting the VOCs gas and a first heat exchanger for cooling the VOCs gas, wherein the inlet end of the buffer tank is communicated with an external VOCs gas collecting pipeline, the inlet end of the compressor set is communicated with the outlet end of the buffer tank through a gas filter, the outlet end of the compressor set is communicated with a gas-liquid separator, the liquid phase outlet end of the gas-liquid separator is communicated with a storage tank, the gas phase outlet end of the gas-liquid separator is communicated with the hot fluid inlet end of the first heat exchanger, a coalescing filter for treating non-condensable high-pressure gas and a liquid separating tank for storing liquefied condensate are communicated with the hot fluid outlet end of the first heat exchanger, the outlet end of the coalescing filter is communicated with a membrane separation unit, the gas inlet end of the membrane separation unit is communicated with an adsorption unit, the outlet end of the adsorption unit is communicated with an oxidation unit, and the outlet end of the oxidation unit is communicated with an exhaust funnel, the permeation end of the membrane separation unit is communicated with the inlet end of the compressor unit through a return pipeline.
2. The apparatus of claim 1 further comprising: and a bypass pipeline for avoiding the compressor unit from being pumped out is communicated with the outlet end of the compressor unit and the inlet end of the compressor unit.
3. The apparatus of claim 1 further comprising: the return pipelines are communicated with vacuum pumps.
4. The apparatus of claim 1 further comprising: and the cold inlet end and the cold outlet end of the first heat exchanger are respectively communicated with an external water chilling unit.
5. The apparatus of claim 1 further comprising: the adsorption unit is provided with 2, and 2 adsorption units are arranged in parallel.
6. The apparatus of claim 1 further comprising: the outlet end of the buffer tank is communicated with an emergency emptying branch.
7. The apparatus of claim 1 further comprising: the coalescence filter is communicated with a hot fluid outlet end of the first heat exchanger through a heating pipeline, and an electric tracing band is wound on the heating pipeline.
8. The apparatus of claim 1 further comprising: and a pressure reduction stabilizing valve is also arranged on a pipeline communicated between the outlet end of the adsorption unit and the oxidation unit.
9. The apparatus of claim 1 further comprising: and a second heat exchanger is also arranged between the oxidation unit and the adsorption unit, the outlet end of the adsorption unit is communicated with the cold inlet end of the second heat exchanger, the cold outlet end of the second heat exchanger is communicated with the inlet end of the oxidation unit, the outlet end of the oxidation unit is communicated with the hot inlet end of the second heat exchanger, and the hot outlet end of the second heat exchanger is communicated with the exhaust funnel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120521645.5U CN214715457U (en) | 2021-03-12 | 2021-03-12 | Sequencing batch type VOCs gas deep treatment device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120521645.5U CN214715457U (en) | 2021-03-12 | 2021-03-12 | Sequencing batch type VOCs gas deep treatment device |
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| Publication Number | Publication Date |
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| CN214715457U true CN214715457U (en) | 2021-11-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202120521645.5U Active CN214715457U (en) | 2021-03-12 | 2021-03-12 | Sequencing batch type VOCs gas deep treatment device |
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- 2021-03-12 CN CN202120521645.5U patent/CN214715457U/en active Active
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