CN210825425U

CN210825425U - Pressure swing adsorption nitrogen making equipment

Info

Publication number: CN210825425U
Application number: CN201921709939.XU
Authority: CN
Inventors: 程昊
Original assignee: Hangzhou Fuyang Bio Gas Equipment Co ltd
Current assignee: Hangzhou Fuyang Bio Gas Equipment Co ltd
Priority date: 2019-10-14
Filing date: 2019-10-14
Publication date: 2020-06-23
Anticipated expiration: 2029-10-14

Abstract

The utility model relates to a pressure swing adsorption nitrogen making equipment belongs to nitrogen making equipment technical field, including first adsorption tower, second adsorption tower and exhaust silencer, exhaust silencer is continuous with first adsorption tower and second adsorption tower through first pipeline and second pipeline respectively, and first pipeline passes through the third pipeline and links to each other with the second pipeline, installs third pneumatic valve and fourth pneumatic valve on the third pipeline, still installs the fourth pipeline on the third pipeline, and the fourth pipeline passes through the fifth pipeline and the sixth pipeline respectively and links to each other with first adsorption tower and second adsorption tower, installs first check valve on the fifth pipeline, installs the second check valve on the sixth pipeline; the utility model adopts the first one-way valve and the second one-way valve to replace the original pneumatic valve, thereby saving the cost and reducing the equipment failure; the quantity of each path of pressure-equalizing tail gas is reasonably controlled, so that the maximum efficiency is achieved, the equipment with different gas quantities and different purities is flexibly and reliably adjusted, and the yield can be improved by about 10%.

Description

Pressure swing adsorption nitrogen making equipment

Technical Field

The utility model relates to a nitrogen making equipment technical field specifically is a pressure swing adsorption nitrogen making equipment.

Background

Pressure Swing Adsorption (PSA) is a new gas separation technology, which uses air as a raw material and separates nitrogen and oxygen from the air by using the selective Adsorption performance of a high-efficiency and high-selectivity solid adsorbent on the nitrogen and oxygen. The nitrogen adsorption tower alternately enters the adsorption tower A or B at certain pressure and time intervals by opening the pneumatic valve, wherein oxygen molecules with smaller diameters are preferentially adsorbed by the carbon molecular sieve, nitrogen molecules with larger diameters flow out from the upper part of the adsorption tower and enter the nitrogen buffer tank for output through the pipeline pneumatic valve and the throttle valve. When one adsorption tower A or B is in the process of gas inlet adsorption nitrogen generation, the other adsorption tower B or A is in the process of gas exhaust desorption regeneration, and the gas exhaust desorption regeneration is to rapidly discharge the oxygen-enriched gas adsorbed by the carbon molecular sieve into the atmosphere through a silencer by opening a pneumatic valve, so that the carbon molecular sieve is regenerated. Thus, the two adsorption towers output nitrogen in the continuous alternate adsorption and desorption process. A transient pressure equalizing process is arranged between adsorption and regeneration, namely, the pressure of the two adsorption towers is equalized by opening the pneumatic valve, which is called pressure equalizing. The throttle valve is used to control the flow rate of the back nitrogen flushing adsorption tower.

The disadvantages of the nitrogen production equipment adopted in the current market are as follows: the number of valves is too large, the failure rate is high, and the equipment cost is increased; the upper and lower pressure equalizing amount can not be adjusted, the equipment can not be in an optimal working state, and the energy consumption is increased.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a pressure swing adsorption nitrogen making equipment to solve the problem that proposes in the above-mentioned background art.

In order to achieve the above object, the utility model provides a following technical scheme:

a pressure swing adsorption nitrogen making device comprises a first adsorption tower, a second adsorption tower and an exhaust silencer, wherein the exhaust silencer is respectively connected with the first adsorption tower and the second adsorption tower through a first pipeline and a second pipeline, a first pneumatic valve is installed on the first pipeline, a second pneumatic valve is installed on the second pipeline, the first pipeline is connected with the second pipeline through a third pipeline, a third pneumatic valve and a fourth pneumatic valve are installed on the third pipeline, a fourth pipeline is also installed on the third pipeline, the fourth pipeline is respectively connected with the first adsorption tower and the second adsorption tower through a fifth pipeline and a sixth pipeline, a first one-way valve is installed on the fifth pipeline, a second one-way valve is installed on the sixth pipeline, a fifth pneumatic valve and a first stop valve are also installed on the fourth pipeline, a seventh pipeline is installed at one end, far away from the first pipeline, of the first adsorption tower, and a seventh pneumatic valve is installed on the seventh pipeline, an eighth pipeline is installed at one end, far away from the second pipeline, of the second adsorption tower, and an eighth pneumatic valve is installed on the eighth pipeline.

As a further technical solution of the present invention: the seventh pipeline is connected with the eighth pipeline through a ninth pipeline, a second stop valve and a sixth pneumatic valve are installed on the ninth pipeline, and the second stop valve is installed at one end close to the seventh pipeline.

As a further technical solution of the present invention: the fourth line is installed between the third pneumatic valve and the fourth pneumatic valve.

As the utility model discloses a further technical scheme again: the fifth pneumatic valve is mounted near one end of the third pipeline.

As the utility model discloses a further technical scheme again: and a tenth pipeline connected with the ninth pipeline in parallel is further installed on the seventh pipeline, one end of the tenth pipeline is connected with the eighth pipeline, and a third stop valve is installed on the tenth pipeline.

Compared with the prior art, the beneficial effects of the utility model are that: the first check valve and the second check valve are adopted to replace the original pneumatic valve, so that the cost is saved and the equipment failure is reduced; when the purity of the product gas of the equipment is different and the size of the equipment is different, the positions of the tail gas purity with obvious gradient difference are also different, therefore, an adjustable pressure equalizing flow is adopted, namely, an adjusting valve is additionally arranged on a pressure equalizing pipeline; the quantity of each path of pressure-equalizing tail gas is reasonably controlled, so that the maximum efficiency is achieved, the equipment with different gas quantities and different purities is flexibly and reliably adjusted, and the yield can be improved by about 10%.

Drawings

FIG. 1 is a schematic diagram of a pressure swing adsorption nitrogen plant.

In the figure: 1-a first adsorption tower, 2-a second adsorption tower, 3-an exhaust muffler, 4-a first pneumatic valve, 5-a second pneumatic valve, 6-a third pneumatic valve, 7-a fourth pneumatic valve, 8-a fifth pneumatic valve, 9-a first stop valve, 10-a first one-way valve, 11-a second one-way valve, 12-a second stop valve, 13-a sixth pneumatic valve, 14-a third stop valve, 15-a seventh pneumatic valve and 16-an eighth pneumatic valve.

Detailed Description

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

Example 1

The pressure swing adsorption nitrogen making equipment as shown in fig. 1 comprises a first adsorption tower 1, a second adsorption tower 2 and an exhaust silencer 3, wherein the exhaust silencer 3 is respectively connected with the first adsorption tower 1 and the second adsorption tower 2 through a first pipeline and a second pipeline, namely, the first adsorption tower 1 and the second adsorption tower 2 are arranged in parallel, a first pneumatic valve 4 is installed on the first pipeline, a second pneumatic valve 5 is installed on the second pipeline, the first pipeline is connected with the second pipeline through a third pipeline, a third pneumatic valve 6 and a fourth pneumatic valve 7 are installed on the third pipeline, a plurality of pneumatic valves are matched with the exhaust silencer 3 to carry out pressure regulation and noise elimination treatment, a fourth pipeline is also installed on the third pipeline, specifically, the fourth pipeline is installed between the third pneumatic valve 6 and the fourth pneumatic valve 7, and the fourth pipeline is respectively connected with the first adsorption tower 1 and the second adsorption tower 2 through a fifth pipeline and a sixth pipeline, the gas-liquid separation adsorption device is characterized in that a first check valve 10 is installed on the fifth pipeline, a second check valve 11 is installed on the sixth pipeline, an original pneumatic valve control structure is replaced by the two check valves, cost is saved, equipment failure is reduced, a fifth pneumatic valve 8 and a first stop valve 9 are further installed on the fourth pipeline, specifically, the fifth pneumatic valve 8 is installed at one end close to the third pipeline, pressure equalizing quantity is adjusted by the first stop valve 9, a seventh pipeline is installed at one end, far away from the first pipeline, of the first adsorption tower 1, a seventh pneumatic valve 17 is installed on the seventh pipeline, an eighth pipeline is installed at one end, far away from the second pipeline, of the second adsorption tower 2, an eighth pneumatic valve 16 is installed on the eighth pipeline, and gas outlet adjustment is achieved through the two pneumatic valves.

Furthermore, the seventh pipeline is connected with the eighth pipeline through a ninth pipeline, the ninth pipeline is provided with a second stop valve 12 and a sixth pneumatic valve 13, the second stop valve 12 is arranged at one end close to the seventh pipeline, and the second stop valve 12 is matched with the first stop valve 9 to adjust the upper and lower pressure equalizing amount, so that the upper and lower pressure equalizing is realized.

Example 2

This embodiment is further optimized on the basis of embodiment 1, still install the tenth pipeline that sets up with the ninth pipeline on the seventh pipeline in parallel, tenth pipeline one end links to each other with the eighth pipeline, install third stop valve 14 on the tenth pipeline, further improved the pressure-equalizing effect through third stop valve 14 to reach the utilization of maximum efficiency, realize nimble reliable adjusting the equipment of different tolerance, different purity, make output can improve about 10%.

The specific working process of the embodiment is as follows:

the method comprises the following steps: pressure equalization of the second adsorption tower 2 and the first adsorption tower 1: pressure equalizing in an upper process: the sixth pneumatic valve 13 is open; pressure equalizing from top to bottom: the third pneumatic valve 6 is opened and the other valves are closed. The second adsorption tower 2 and the first adsorption tower 1 are pressure-balanced to reduce pressure loss, and the upper and lower pressure equalizing amount can be adjusted by a first stop valve 9 and a second stop valve 12.

Step two: the first adsorption tower 1 adsorbs: the second, third, fifth, and seventh air-operated

valves

5, 6, 8, and 15 are opened, and the other valves are closed. Clean compressed air is opened through fifth pneumatic valve 8 and third pneumatic valve 6 and gets into first adsorption tower 1, and wherein the less oxygen molecule of diameter is preferentially adsorbed by carbon molecular sieve, and the great nitrogen molecule of diameter then flows out through the upper portion of adsorption tower, gets into the nitrogen gas storage tank after seventh pneumatic valve 15 opens. The nitrogen produced in the first adsorption tower 1 flows through the adsorber through a third stop valve 14, and the water, oxygen, carbon dioxide and hydrocarbon adsorbed on the molecular sieve are carried away by the nitrogen produced in the low pressure.

Step three: the second adsorption column 2 is closed in advance: the third pneumatic valve 6, the fifth pneumatic valve 8 and the seventh pneumatic valve 15 are opened, other valves are closed, and the second pneumatic valve 5 is closed after the first adsorption tower 1 is saturated in adsorption, so that gas evacuation caused by valve action delay is prevented.

Step four: equalizing the pressure of the first adsorption tower 1 to the pressure of the second adsorption tower 2: pressure equalizing in an upper process: the sixth pneumatic valve 13 is open; pressure equalizing from top to bottom: the fourth pneumatic valve is open and the other valves are closed. The second adsorption column 2 and the first adsorption column 1 are pressure-equalized to reduce pressure loss. The upper and lower pressure equalizing amount can be adjusted by the first and

second cutoff valves

9 and 12.

Step five: the second adsorption tower 2 adsorbs: the first, fourth, fifth, and eighth air-operated

valves

8, 16 are opened, and the other valves are closed. Clean compressed air is opened through fifth pneumatic valve 8 and fourth pneumatic valve and is got into second adsorption tower 2, and wherein the less oxygen molecule of diameter is preferentially adsorbed by carbon molecular sieve, and the great nitrogen molecule of diameter then flows through the upper portion of adsorption tower, gets into the nitrogen gas storage tank after eighth pneumatic valve 16 opens. The nitrogen produced in the first adsorption tower 1 flows through the adsorber through a third stop valve 14, and the water, oxygen, carbon dioxide and hydrocarbon adsorbed on the molecular sieve are carried away by the nitrogen produced in the low pressure.

Step six: the first adsorption column 1 is closed in advance: the fourth pneumatic valve, the fifth pneumatic valve 8 and the eighth pneumatic valve 16 are opened, the other valves are closed, and when the second adsorption tower 2 is saturated in adsorption, the first pneumatic valve is closed to prevent the evacuation of gas caused by the delay of valve operation.

The adjustable pressure equalizing amount of the first step and the fourth step has the advantages that:

when the purity of the product gas of the equipment is different and the size of the equipment is different, the position of the tail gas purity with obvious gradient difference is also different, therefore, the pressure equalizing flow is adopted, namely, the pressure equalizing pipeline is additionally provided with the regulating valve. The amount of each path of pressure-equalizing tail gas is reasonably controlled, so that the maximum efficiency utilization is achieved. Flexibly and reliably adjust the equipment with different gas volumes and different purities.

It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. The utility model provides a pressure swing adsorption nitrogen plant, includes first adsorption tower (1), second adsorption tower (2) and exhaust muffler (3), its characterized in that: the exhaust silencer (3) is connected with a first adsorption tower (1) and a second adsorption tower (2) through a first pipeline and a second pipeline respectively, a first pneumatic valve (4) is installed on the first pipeline, a second pneumatic valve (5) is installed on the second pipeline, the first pipeline is connected with the second pipeline through a third pipeline, a third pneumatic valve (6) and a fourth pneumatic valve (7) are installed on the third pipeline, a fourth pipeline is further installed on the third pipeline, the fourth pipeline is connected with the first adsorption tower (1) and the second adsorption tower (2) through a fifth pipeline and a sixth pipeline respectively, a first one-way valve (10) is installed on the fifth pipeline, a second one-way valve (11) is installed on the sixth pipeline, a fifth pneumatic valve (8) and a first stop valve (9) are further installed on the fourth pipeline, a seventh pipeline is installed at one end, far away from the first pipeline, of the first adsorption tower (1), and a seventh pneumatic valve (17) is installed on the seventh pipeline, an eighth pipeline is installed at one end, far away from the second pipeline, of the second adsorption tower (2), and an eighth pneumatic valve (16) is installed on the eighth pipeline.

2. The pressure swing adsorption nitrogen plant of claim 1, characterized in that: the seventh pipeline is connected with the eighth pipeline through a ninth pipeline, a second stop valve (12) and a sixth pneumatic valve (13) are installed on the ninth pipeline, and the second stop valve (12) is installed at one end close to the seventh pipeline.

3. The pressure swing adsorption nitrogen plant of claim 1 or 2, characterized in that: the fourth line is installed between the third pneumatic valve (6) and the fourth pneumatic valve (7).

4. The pressure swing adsorption nitrogen plant of claim 3, characterized in that: and the fifth pneumatic valve (8) is arranged at one end close to the third pipeline.

5. The pressure swing adsorption nitrogen plant of claim 3, characterized in that: and a tenth pipeline connected with the ninth pipeline in parallel is further installed on the seventh pipeline, one end of the tenth pipeline is connected with the eighth pipeline, and a third stop valve (14) is installed on the tenth pipeline.