CN214715458U - Shallow cold combination formula VOCs gas recovery unit of high pressure - Google Patents

Abstract

The utility model provides a shallow cold combination formula VOCs gas recovery unit of high pressure, which comprises a buffer tank, compressor unit and 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 heat exchanger, the hot-fluid exit end intercommunication at the heat exchanger has the coalescence filter that is used for not condensing high-pressure gas to handle and the knockout drum that is used for saving the liquefied gas condensate, coalescence filter's exit end intercommunication has membrane separation unit, membrane separation unit's inlet end intercommunication has adsorption element, exit end intercommunication at adsorption element has the aiutage, membrane separation unit's infiltration end passes through the entrance point intercommunication of backflow pipeline with compressor unit. The device has improved efficiency through the mode that increases the gaseous partial pressure of VOCs, has realized the purpose of shallow cold low temperature technology high efficiency recovery VOCs gaseous component.

Description

Shallow cold combination formula VOCs gas recovery unit of high pressure

Technical Field

The utility model relates to a gaseous recovery technical field of VOCs, especially a shallow cold combination formula VOCs gas recovery device of high pressure.

Background

At present, a condensation process, an adsorption process, an absorption process and the like are widely applied to the VOCs gas treatment industry, a combined treatment process is often adopted for partial VOCs gas to meet the mobile unloading function, management is inconvenient, and due to the large demand of the LNG industry, an LNG storage and transportation station cannot meet loading of a large number of LNG tank cars, and the LNG storage and transportation station needs allocation among areas, so that reasonable utilization of resources among the areas is realized.

Secondly, the VOCs gas recovery technology is mostly treated under the normal pressure working condition, and for VOCs gas with certain concentration, condensation or adsorption process flows are mostly adopted, if the requirement on tail gas emission is high, destruction technologies such as catalytic oxidation, heat storage oxidation and the like are needed; for most VOC volatile components, a condensation process is adopted, so that the effect is better, the removal efficiency is better when the temperature is reduced to about-75 ℃ under normal pressure, but the existing low-temperature condensation unit has the problems of poor operation stability, insufficient condensation temperature, defrosting and defrosting, refrigerant leakage and the like.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that to prior art not enough, provide a compact structure, efficiency is higher, the operation is more stable technology combination VOCs gas recovery unit's gaseous recovery unit of shallow cold combination formula VOCs of high pressure.

The technical problem to be solved by the utility model is realized through the following technical scheme. The utility model relates to a shallow cold combination formula VOCs gaseous recovery unit of high pressure, the device includes the buffer tank that is used for splendid attire VOCs gas, a compressor unit that is used for stepping up VOCs gas and the heat exchanger that is used for cooling 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, the liquid phase exit end intercommunication of vapour and liquid separator has the storage tank, the vapour phase exit end of vapour and liquid separator communicates with the hot-fluid inlet end of heat exchanger, it has the coalescence filter that is used for the processing of noncondensable high-pressure gas and the knockout drum that is used for storing the liquefied condensate to communicate at the hot-fluid exit end of heat exchanger, the exit end intercommunication of coalescence filter has membrane separation unit, the inlet end intercommunication of membrane separation unit has the adsorption unit, there is the aiutage in the exit end intercommunication of adsorption unit, the permeation end of the membrane separation unit is communicated with the inlet end of the compressor unit through a return pipeline.

The utility model discloses the technical problem that will solve can also further realize through following technical scheme, to above the gaseous recovery unit of high pressure shallow cold combination formula VOCs, still communicate the by pass line that has the compressor unit of avoiding 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 will solve can also further realize through following technical scheme, to above the gaseous recovery unit of shallow cold combination formula VOCs of high pressure, 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 high pressure shallow cold combination formula VOCs gas recovery unit, the cold entrance point and the cold exit end of 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 recovery unit of shallow cold combination formula VOCs of high pressure, it is provided with 2 to adsorb the unit, and 2 adsorb the parallelly connected setting of unit.

The utility model discloses the technical problem that will solve can also further realize through following technical scheme, to above the gaseous recovery unit of shallow cold combination formula VOCs of high pressure still sets up the pressure reduction stabilizer valve at the exit end of absorption unit.

The utility model discloses the technical problem that will solve can also further realize through following technical scheme, to above the gaseous recovery unit of shallow cold combination formula VOCs of high pressure, there is urgent unloading branch road at the exit end intercommunication of buffer tank.

The utility model discloses the technical problem that will solve can also further realize through following technical scheme, to above the gaseous recovery unit of shallow cold combination formula VOCs of high pressure, the coalescence filter passes through the hot-fluid outlet end intercommunication of heated tube and heat exchanger, and the winding has the electric tracing area on heated tube.

Compared with the prior art, the utility model discloses a set up of compressor unit, heat exchanger, membrane separation unit and adsorption unit, with the organic combination of high-pressure technology, shallow cold technology, membrane separation technology and adsorption process can carry out high-efficient recovery with the VOCs gaseous component in the VOCs mixed gas who collects, realize the purpose that the tail gas discharge to reach standard, have 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 has combined multiple process flow, through utilizing the mode that increases the gaseous partial pressure of VOCs, has effectually increased the efficiency of conventional technology means, has realized shallow cold low temperature technology and has retrieved VOCs gaseous component with high efficiency, improves adsorption efficiency to realize the purpose that tail gas discharge to reach standard, have good social.

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, the high-pressure shallow-cooling combined type VOCs gas recovery device comprises a buffer tank 1 for containing VOCs gas, a compressor unit 3 for boosting the VOCs gas and a 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 and is used for storing and buffering the collected VOCs gas, and the VOCs gas stays for enough time before being output so as to be convenient for the VOCs gas in the buffer tank 1 to be 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 heat exchanger 5 for sending the non-condensable gas into the heat exchanger 5 for cooling treatment;

a coalescence filter for treating the uncondensed high-pressure gas and a liquid separation tank 8 for storing liquefied condensate are communicated with the hot fluid outlet end of the 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 exhaust funnel, and the permeation end of the membrane separation unit 6 is communicated with the inlet end of the 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 heat exchanger 5 adopts a shell-and-tube heat exchanger 5 in the prior art; the device adopts overall structure, and removable assembly is convenient for fixedly place the scene as required.

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 membrane separation unit 6 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 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 heat exchanger 5 and the external water chilling unit, and therefore heat exchange and cooling treatment can be performed on the boosted mixed gas entering the heat exchanger 5.

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.

A pressure reduction stabilizing valve is also arranged at the outlet end of the adsorption unit 9 and used for maintaining the interior of the system in a high-pressure operation state.

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 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 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 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 heat exchanger 5 for cooling, the condensed liquid generated by liquefaction enters a liquid separation tank 8 for storage, the uncondensed high-pressure gas enters a coalescing filter, a small amount of oil mist droplets are removed by the coalescing filter, and the oil mist droplets enter a membrane separation unit 6;

(4) after being treated by the membrane separation unit 6, VOCs molecules migrating at low speed pass through a backflow pipeline 10 to the compressor unit 3, and low-concentration VOCs mixed gas migrating at high speed enters an adsorption unit 9, is subjected to deep adsorption, and is discharged by an exhaust funnel after being decompressed.

Claims (8)

1. The utility model provides a gaseous recovery unit of shallow cold combination formula VOCs of high pressure which characterized in that: the device comprises a buffer tank for containing VOCs gas, a compressor set for boosting the VOCs gas and a 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 heat exchanger, a coalescence filter for processing the uncondensed high-pressure gas and a liquid separating tank for storing the liquefied condensate are communicated with the outlet end of the hot fluid of the heat exchanger, a membrane separation unit is communicated with the outlet end of the coalescence filter, an adsorption unit is communicated with the air inlet end of the membrane separation unit, the outlet end of the adsorption 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 return pipeline.

2. The high pressure shallow cooling combined VOCs gas recovery device of claim 1, wherein: 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 high pressure shallow cooling combined VOCs gas recovery device of claim 1, wherein: the return pipelines are communicated with vacuum pumps.

4. The high pressure shallow cooling combined VOCs gas recovery device of claim 1, wherein: and the cold inlet end and the cold outlet end of the heat exchanger are respectively communicated with an external water chilling unit.

5. The high pressure shallow cooling combined VOCs gas recovery device of claim 1, wherein: the adsorption unit is provided with 2, and 2 adsorption units are arranged in parallel.

6. The high pressure shallow cooling combined VOCs gas recovery device of claim 1, wherein: and a pressure reduction stabilizing valve is also arranged at the outlet end of the adsorption unit.

7. The high pressure shallow cooling combined VOCs gas recovery device of claim 1, wherein: the outlet end of the buffer tank is communicated with an emergency emptying branch.

8. The high pressure shallow cooling combined VOCs gas recovery device of claim 1, wherein: the coalescence filter is communicated with a hot fluid outlet end of the heat exchanger through a heating pipeline, and an electric tracing band is wound on the heating pipeline.

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