CN209908792U

CN209908792U - Turbine-driven centrifugal blower applied to PSA air separation system

Info

Publication number: CN209908792U
Application number: CN201821482633.0U
Authority: CN
Inventors: 李伟华; 李传旭
Original assignee: Chongqing Punching Power Machinery Co Ltd
Current assignee: Chongqing Punching Power Machinery Co Ltd
Priority date: 2018-09-11
Filing date: 2018-09-11
Publication date: 2020-01-07
Anticipated expiration: 2028-09-11

Abstract

The utility model discloses an use turbine drive centrifugal blower in PSA air separation system belongs to the industrial power equipment field. The centrifugal fan comprises a common rotor positioned in a machine base, wherein the common rotor comprises a centrifugal fan impeller and a turbine impeller, and the centrifugal fan impeller is connected with the turbine impeller through a main shaft. The technical scheme adopts a turbine driving mode, so that the centrifugal blower can be applied to a PSA \ VPSA system, the energy consumption of the PSA \ VPSA system is reduced, the noise level of the system is greatly reduced, and the application range of the system is expanded.

Description

Turbine-driven centrifugal blower applied to PSA air separation system

Technical Field

The utility model belongs to industry power equipment field particularly, is a turbine drive centrifugal blower who uses in PSA air separation system.

Background

PSA and VPSA systems are gas separation devices, particularly for separating oxygen from air, and are widely used in industrial applications. The figure is a flow diagram of a PSA/VPSA system, the system protects two adsorption towers, a certain amount of molecular sieve is filled in the adsorption towers, the air blower alternately blows and boosts the pressure of the two towers through the control of a valve, fresh air is blown into the adsorption towers, the molecular sieve adsorbs nitrogen, and oxygen which is not adsorbed is output into a buffer tank.

The actual operation of the blower at the PSA/VPSA is thus: during a working period, the pressure ratio of the blower is gradually increased from 1 to the highest pressure, after the period is finished, the system is rapidly switched to another tower through a valve, the outlet pressure of the blower is rapidly recovered to 1, and then the pressure is gradually increased.

In conventional PSA/VPSA systems, Roots blowers are typically used for blowers because they have positive correlation properties with the system, i.e., when the blower pressure is low, the power consumed by the blower is also low. However, the roots blower still has the problems of low efficiency, high noise, low single-stage flow and the like.

A problem also exists with the direct application of the conventional electrically driven centrifugal blower, and figure three depicts the characteristic curves of a typical centrifugal blower, which operates at design point a with high efficiency and power maintained at a lower level, but at low pressure and high flow operating point B with low efficiency and no drop in power. The actual power consumption is instead higher than that of the roots blower.

SUMMERY OF THE UTILITY MODEL

The object of the present invention is to provide a turbine driven centrifugal blower for use in a PSA air separation system that solves the above mentioned technical problems.

In order to realize the technical purpose, the utility model discloses a technical scheme as follows:

a turbine driven centrifugal blower for use in a PSA air separation system includes a common rotor located within a housing, the common rotor including a centrifugal blower wheel, a turbine wheel, the centrifugal blower wheel and the turbine wheel being connected by a main shaft.

Further limit, the turbine wheel is provided with a turbine nozzle corresponding to the turbine, and the passage area of the turbine nozzle is an adjustable structure.

Further defined, the common rotor is supported on the housing by a left bearing and a right bearing.

Further defined, the left bearing and the right bearing are one of a sliding bearing, a rolling bearing, an air bearing or a magnetic suspension bearing.

Further defined, the turbine wheel corresponds to the turbine and is one of a centripetal turbine or an axial turbine.

Further defined, the turbine and the blower are designed to be sealed separately.

Further, the corresponding casing of the centrifugal blower and the corresponding turbine nozzle turbine casing of the turbine are both mounted on the base through flanges.

Compared with the prior art, the utility model, adopt turbine driven mode for centrifugal blower can use in PSA VPSA system, has not only reduced the energy consumption of PSA VPSA system, and the noise level of the also greatly reduced system has expanded the range of application of system simultaneously.

Drawings

The present invention can be further illustrated by the non-limiting examples given in the accompanying drawings;

FIG. 1 is a schematic diagram of a turbine driven centrifugal blower for use in a PSA air separation system in accordance with the present invention;

FIG. 2 is a schematic flow diagram of a PSA/VPSA system;

FIG. 3 is a graphical representation of the change in blower outlet pressure over time in a PSA \ VPSA system;

FIG. 4 is a schematic representation of a typical centrifugal blower characteristic curve;

FIG. 5 is a schematic diagram of flow-pressure/power characteristics at different rotational speeds of a blower;

FIG. 6 is a schematic representation of power-pressure characteristics at different rotational speeds of the turbine;

FIG. 7 is a schematic diagram of the high efficiency operating curve of a centrifugal blower;

the main element symbols are as follows:

the centrifugal blower comprises a centrifugal blower impeller 1, a casing 2, a seal 3, a machine base 4, a left bearing 5, a main shaft 6, a right bearing 7, a turbine impeller 9 and a turbine nozzle 10.

Detailed Description

In order to make the present invention better understood by those skilled in the art, the technical solutions of the present invention are further described below with reference to the accompanying drawings and examples.

As shown in fig. 1, 2, 3, 4, 5, 6, 7, a turbine-driven centrifugal blower for use in a PSA air separation system includes a common rotor within a housing, the common rotor including a centrifugal blower wheel, a turbine wheel, the centrifugal blower wheel and the turbine wheel being connected by a main shaft.

In the embodiment, the centrifugal blower impeller (1) is connected with the turbine impeller (9) through the main shaft (6) to form a common rotor structure, namely, the complete rotation speed synchronization and the torque synchronization of the centrifugal blower impeller (6) and the turbine impeller (9) are realized, the complete power synchronization of the centrifugal blower impeller and the turbine impeller (9) is also realized (except for the consumption of bearings), the common rotor is supported on the base (4) through the left bearing (5) and the right bearing (7), and the left bearing (5) and the right bearing (7) can be sliding bearings, rolling bearings, air-floating bearings or magnetic-floating bearings. The corresponding shell (2) of the centrifugal blower and the turbine shell (11) of the turbine nozzle (10) are both arranged on the base (4) through flanges. The turbine may be a centripetal turbine or an axial turbine. The turbine and the blower are respectively designed with a seal (3) and a seal (8).

The centrifugal blower has the advantages of high efficiency, high flow, low noise and the like, but has the defect of low efficiency at a non-design point (particularly a high-flow operating point), when the power consumption of the centrifugal blower is increased, namely in the fourth figure, when the operating point of the blower is moved from A to B, the power of the turbine is only kept unchanged and cannot be increased under the condition that the condition of a driving air source is unchanged, so that the power provided by the turbine to the blower sharing a rotor is limited, the blower cannot realize the transfer from the A point to the B point and only can reduce the rotating speed under the working conditions of outlet pressure reduction, flow increase and power increase, then the power balance at the low rotating speed is realized, namely the blower operates from the high rotating speed N1 to the N2, and the final operating point is the E point under the N2 rotating speed through constant power comparison. In general, the output power will be reduced by a small amount after the turbine speed is reduced, so the actual operating point of the blower will be the lower power F point.

Under such conditions, the output power of the blower is limited to a maximum by the turbine. But at the F point, although the power of the blower is lower, the efficiency is still lower, and the excavated space is available, in order to further reduce the system energy consumption, the turbine nozzle (10) can be designed to be adjustable, the passage area of the turbine nozzle (10) is adjusted in real time according to the pressure requirement of the system on the blower, so that the full-flow high-efficiency operation of the centrifugal blower is realized, and the system energy consumption of PSA/VPSA is greatly reduced.

The turbine driven centrifugal blower used in the PSA air separation system according to the present invention has been described in detail above. The description of the specific embodiments is only intended to facilitate an understanding of the method of the invention and its core ideas. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, the present invention can be further modified and modified, and such modifications and modifications also fall within the protection scope of the appended claims.

Claims

1. A turbine driven centrifugal blower for use in a PSA air separation system, comprising a common rotor located in a housing, characterized in that: the common rotor comprises a centrifugal blower impeller and a turbine impeller, the centrifugal blower impeller is connected with the turbine impeller through a main shaft, the turbine impeller is provided with a turbine nozzle corresponding to the turbine, and the passage area of the turbine nozzle is of an adjustable structure.

2. A turbine driven centrifugal blower for use in a PSA air separation system according to claim 1, wherein: the common rotor is supported on the housing by a left bearing and a right bearing.

3. A turbine driven centrifugal blower for use in a PSA air separation system according to claim 2, wherein: the left bearing and the right bearing are one of a sliding bearing, a rolling bearing, an air bearing or a magnetic suspension bearing.

4. A turbine driven centrifugal blower for use in a PSA air separation system according to claim 1, wherein: the turbine wheel corresponds to the turbine and is one of a centripetal turbine or an axial flow turbine.

5. A turbine driven centrifugal blower for use in a PSA air separation system according to claim 1, wherein: the turbine and the blower are respectively designed with a seal.

6. A turbine driven centrifugal blower for use in a PSA air separation system according to claim 5, wherein: and the corresponding shell of the centrifugal blower and the turbine nozzle turbine shell of the turbine are both arranged on the base through flanges.