Multi-stage gas purification system

Abstract

The utility model discloses a gas multi-stage purification system which comprises a front filtering assembly connected with an adsorption assembly, and the front filtering assembly is composed of a plurality of filters used for intercepting granular and liquid drop-shaped impurities. In the first aspect, the gas purity is improved by applying the adsorption assembly and the filtering assembly in a combined mode, the gas enters the adsorption assembly to be further purified after macromolecular impurities are removed through a front-arranged multi-stage filtering structure, in addition, a back pressure valve for improving the working pressure of the system is arranged, the service life of the system is prolonged, and the cost is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of compressed gas filter, especially a gas multistage purification system. BACKGROUND

[0002] The temperature of helium gas is increased after high pressure compression by the compressor, and oil gas generated during the operation of the compressor can be brought out. For some customers with high requirements on the purity of compressed gas, the oil gas separation mechanism of the compressor cannot meet the requirements of the customers on the compressed gas. CONTENT OF THE UTILITY MODEL

[0003] In order to overcome the above-mentioned defects of the prior art, the utility model aims at providing a gas multistage purification system to improve the purity of gas.

[0004] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme:

[0005] A gas multistage purification system comprises a pre-filter assembly connected with an adsorption assembly, the pre-filter assembly is composed of a plurality of filters for intercepting particulate and droplet impurities, the number of the filters is at least one, the filters are connected with each other in series, and the pre-filter assembly has a three-stage filtering structure.

[0006] Further, the dust removal filtering performance of the filter is any one of 2 μm / 1 μm / 0.1 μm / 0.01 μm.

[0007] Further, the oil removal performance of the filter is any one of 2 ppm / 1 ppm / 0.1 ppm / 0.01 ppm.

[0008] Further, the adsorption assembly comprises at least one adsorber, and the adsorber is provided with activated carbon and / or molecular sieve for purifying harmful gas and moisture.

[0009] Further, the adsorber has an input end arranged at the bottom and an output end arranged at the top, and the input end and the output end are of a split structure.

[0010] Further, a dust removal filter is arranged at the rear end of the adsorber, and the dust removal filter and the plurality of filters are connected through a blowdown pipe at the bottom to discharge blowdown.

[0011] Further, the compressed helium gas flows out through an exhaust valve after being input into the system through an air inlet valve.

[0012] Further, the utility model further comprises a back pressure valve connected with the adsorption assembly or the filter assembly and used for improving the pressure of the purification system.

[0013] The utility model has the advantages of:

[0014] The utility model provides a kind of gas multistage purification system, first aspect is through combined use adsorption component and filter component to improve gas purity, the multistage filter structure of preposition makes gas after removing macromolecular impurities further purifies into adsorption component again, in addition, back pressure valve is arranged to improve system life to reduce cost to improve system working pressure. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or the prior art description.

[0016] Figure 1 It is the overall schematic view of the utility model.

[0017] Figure 2 It is the partial sectional view of prefilter assembly.

[0018] Figure 3 It is Figure 1 rear side view of DETAILED DESCRIPTION

[0019] In the description of the utility model, it needs to be explained that the orientation or position relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer" and the like is based on the orientation or position relationship shown in the drawings, and the above description is simplified for the convenience of describing the utility model, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, so it cannot be understood as a limitation on the utility model.

[0020] The singular forms "a", "said" and "the" used in the specification are included unless clearly indicated, and the plural forms. The terms "include", "contain" and "have" used in the specification indicate the existence of the claimed features, but do not exclude the existence of one or more other features. The term "and / or" used in the specification includes any and all combinations of one or more of the related listed items.

[0021] In the specification, when one element is located on another element, "fixed" to another element, "connected" to another element, "joined" to another element, etc., the element can be directly located on another element, fixed to another element, connected to another element, joined to another element or in contact with another element, or there can be an intermediate element.

[0022] It can be understood that although the terms "first", "second" and the like can be used herein to illustrate different elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. Therefore, the first element can be referred to as the second element without departing from the teachings of the present application concept.

[0023] The exemplary embodiments of the present application will be described below with reference to the accompanying drawings. It is to be understood, however, that the present application can be presented in various different ways and is not limited to the embodiments described below. It is also to be understood that the embodiments disclosed herein can be combined in various ways to provide more additional embodiments. In all the drawings, the same reference numerals denote the same or functionally equivalent elements.

[0024] Figure 1 The overall gas multi-stage purification system shows that the system is divided into an adsorption assembly and a filter, and the filter is arranged in front. After the gas enters the system, it first passes through the filter to filter the particulate and droplet impurities in the compressed gas, and then enters the adsorption assembly to remove harmful gases and moisture, and finally is output after dust removal.

[0025] In combination with reference Figure 2 The pre-filter assembly is composed of a first filter 110, a second filter 120 and a third filter 130 in series with each other, and the compressed gas enters the adsorption process after passing through the three-stage pre-filter structure composed of the first filter 110, the second filter 120 and the third filter 130 in turn. Each independent first filter 110, second filter 120 and third filter 130 has the same structure, and a pre-filter core 112 is arranged in the shell 116. The gas flows into the shell 116 from the upper inlet 113, moves inward from the outside of the pre-filter core 112, and then enters the next filter through the top outlet 114. A pre-filter blowdown port 115 is also arranged at the bottom of the shell 116, and the particulate and droplet impurities removed after passing through the pre-filter core 112 are discharged from the bottom through the pre-filter blowdown port 115. Preferably, the first filter 110, the second filter 120 and the third filter 130 are dust and / or oil removal filters, and the dust removal filtration performance is 2 μm / 1 μm / 0.1 μm / 0.01 μm; the oil removal performance is any one combination of 2 ppm / 1 ppm / 0.1 ppm / 0.01 ppm.

[0026] The adsorption assembly includes a first adsorber 210 and a second adsorption filter 220, and the first adsorber 210 and the second adsorber 220 are filled with molecular sieve and / or activated carbon. Considering that carbon monoxide, carbon dioxide, nitrogen oxides and other toxic and harmful gases generated by lubricating oil at high temperature during the compression process of the compressor are mixed into the compressed helium gas with the operation of the compressor, the activated carbon is used to adsorb the harmful gases such as lubricating oil vapor in the gas in the adsorption process, and the molecular sieve is used to adsorb the moisture in the compressed helium gas.

[0027] The high pressure gas passing through the filter enters the first and second adsorbers 210 and 220 from the bottom to complete the filtration. The first and second adsorbers 210 and 220 are connected to the pipeline by a detachable structure, which is beneficial to directly remove the adsorber tank for maintenance of the filter material inside. Further, a filter screen is provided at the connection to prevent the internal filler from being washed out. The tail end of the adsorption assembly is provided with a dust removal filter 300 for removing the precipitates of each component in the filtration system. The compressed gas passes through the final dust removal and is output from the system through the exhaust valve 3. Preferably, the exhaust valve 3 is a back pressure valve to increase the working pressure of the entire system. Since the service life of each filter core in the system is calculated according to the volume flow rate, increasing the pressure can reduce the relative volume and prolong the service life of the filter core.

[0028] With reference to Figure 3 The purifier discharges through the first filter blowdown pipe 111, the second filter blowdown pipe 121 and the third filter blowdown pipe 131 connected to the first filter 110, the second filter 120 and the third filter 130 respectively. The dust removal filter 300 also has a dust removal filter blowdown pipe 301. The first filter blowdown pipe 111, the second filter blowdown pipe 121, the third filter blowdown pipe 131 and the dust removal filter blowdown pipe 301 are collected and then discharge the dirt from the bottom blowdown outlet 4. In order to prevent the system from being overloaded at high pressure, a safety valve 2 is provided between the inlet valve 1 and the filter.

[0029] In another preferred embodiment, the inlet valve 1 and the exhaust valve 3 are ball valves that can control the inlet and outlet passages. They are used to cut off the passage when the system is detected and maintained, or when the system is transported, nitrogen is filled into the system, and the gas is maintained in the system through the inlet and exhaust valves 1 and 3 to prevent the activated carbon and / or molecular sieve in the adsorption assembly from being invaded by impurities and being wetted and failed.

Claims

1. A multi-stage gas purification system, characterized in that, include: A pre-filter assembly connected to the adsorption assembly, the pre-filter assembly being composed of several filters for intercepting particulate and droplet impurities, the number of filters being at least one, the filters being connected in series with each other, the pre-filter assembly being a three-stage filtration structure.

2. The gas multi-stage purification system as described in claim 1, characterized in that, The dust removal filtration performance of the filter is any one of 2μm / 1μm / 0.1μm / 0.01μm.

3. The gas multi-stage purification system as described in claim 1, characterized in that, The oil removal performance of the filter is any one of 2ppm / 1ppm / 0.1ppm / 0.01ppm.

4. A multi-stage gas purification system as described in any one of claims 1 to 3, characterized in that, The adsorption assembly includes at least one adsorber, which is provided with activated carbon and / or molecular sieves for purifying harmful gases and moisture.

5. A multi-stage gas purification system as described in claim 4, characterized in that, The adsorber has an input end located at the bottom and an output end located at the top, and the input end and the output end are separate structures.

6. The gas multi-stage purification system as described in claim 4, characterized in that, A dust filter is also provided at the rear end of the adsorber, and the dust filter and the plurality of filters are all discharged through the drain pipe at the bottom.

7. A multi-stage gas purification system as described in claim 4, characterized in that, Compressed helium gas is introduced into the system through the inlet valve and then flows out through the exhaust valve.

8. A multi-stage gas purification system as described in claim 4, characterized in that, It also includes a back pressure valve connected to the adsorption component or the filtration component for increasing the pressure of the purification system.

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