Gas condensate recovery device and method

Abstract

The present invention discloses a gas condensate recovery device, including a pump housing, a drainage system, a rotating shaft and propeller blades. The pump housing is provided with a chamber, an air inlet and an air outlet. The drainage system is mounted on the pump housing, and the rotating shaft is rotatably arranged in the chamber for connecting with a rotating power source. The propeller blades are arranged on the rotating shaft, and the propeller blades include a boosting blade and a decompression blade arranged in sequence along the gas flow direction. The boosting blade cooperates with the inner wall of the chamber to form a boosting chamber to pressurize the gas, and the decompression blade cooperates with the inner wall of the chamber to form a decompression chamber to decompress the gas. The present invention also discloses a gas condensate recovery method. In the above-mentioned gas condensate recovery device and method, the state of the gas entering and leaving the chamber resonates between high pressure and low pressure, and the work required to be input from the outside is very small. At the same time, the gas can drive the propeller blades to rotate, thereby reducing the energy consumption of recovered water and improving economic benefits.

Description

Technical Field

[0001] The present invention relates to the technical field of waste gas treatment, and in particular to a gas condensate recovery device and method. Background Art

[0002] As we all know, the waste gas of sewage treatment plants comes from various sewage treatment tanks, and the water in them is saturated steam in most cases. In addition, the products of hydrocarbon combustion such as coal-fired, gas-fired, and oil-fired boilers contain a large amount of water and carbon dioxide. After the heat is recovered by the economizer, the water in the flue gas will also be saturated. Therefore, recovering water from moist saturated gas can not only expand the source of water, but also reduce the emission of harmful pollutants in the above-mentioned gas, making it easier to control pollutants in the gas.

[0003] At present, the main method for recovering moisture from humid gas is condensation. The condensation method uses a compressor to refrigerate, and through the heat exchange between the refrigerant and the humid gas, the moisture in the humid gas is supersaturated and condensed into liquid water to recover the moisture in the humid gas. However, this method requires high energy consumption and the humid gas needs to be cooled. The heat generated by the compressor is low-grade heat and difficult to reuse. Therefore, the input-output economic benefits of the condensation method for recovering moisture from humid gas are not obvious. Summary of the invention

[0004] Based on this, it is necessary to provide a gas condensate recovery device and method to address the problems of high energy consumption and unclear economic benefits of the existing condensation method for recovering moisture from humid gas.

[0005] A gas condensate recovery device, comprising:

[0006] A pump housing, wherein the pump housing is provided with a chamber, and the pump housing is also provided with an air inlet and an air outlet communicated with the chamber;

[0007] A drainage system, installed on the pump housing, the drainage system is used to discharge condensed water in the chamber;

[0008] A rotating shaft is rotatably arranged in the chamber, and the rotating shaft extends out of the pump housing to be connected to a rotating power source; and

[0009] The propeller blades are arranged on the rotating shaft, and the propeller blades include a boosting blade and a decompression blade which are arranged in sequence along the gas flow direction. The boosting blade cooperates with the inner wall of the chamber to form a boosting chamber to pressurize the gas, and the decompression blade cooperates with the inner wall of the chamber to form a decompression chamber to decompress the gas.

[0010] In one of the embodiments, the radius of the impeller of the booster blade gradually increases along the gas flow direction, and the area of ​​the flow channel between the impeller and the inner wall of the chamber remains unchanged.

[0011] In one of the embodiments, the radius of the impeller of the pressure reducing blade gradually decreases along the gas flow direction, and the area of ​​the flow channel between the impeller and the inner wall of the chamber remains unchanged.

[0012] In one of the embodiments, the shape of the pump casing matches the profile change of the impeller, and the drainage system is arranged in the middle of the pump casing.

[0013] In one of the embodiments, the pitch of the impeller of the booster blade gradually decreases along the gas flow direction, and the area of ​​the flow channel between the impeller and the inner wall of the chamber gradually decreases along the gas flow direction.

[0014] In one of the embodiments, the pitch of the impeller of the pressure reducing blade gradually increases along the gas flow direction, and the area of ​​the flow channel between the impeller and the inner wall of the chamber gradually increases along the gas flow direction.

[0015] In one of the embodiments, the diameter of the pump casing remains unchanged, and the pump casing is arranged at an incline, and the drainage system is arranged at a relatively lower end of the pump casing.

[0016] In one of the embodiments, the pressurization paddles and the decompression paddles are symmetrically arranged about a dividing line between the pressurization chamber and the decompression chamber.

[0017] In one of the embodiments, a heat balance system is further included, wherein the fluid medium of the heat balance system takes away the heat during the compression process of the gas and provides the gas with heat for expansion and absorption.

[0018] A method for recovering gas condensate, using any one of the gas condensate recovery devices described above, comprising the following steps:

[0019] The rotating shaft drives the propeller blade to rotate;

[0020] The gas enters the pressurized chamber through the air inlet, the gas is pressurized and compressed in the pressurized chamber, and the gas condenses to separate water;

[0021] The gas enters the decompression chamber, the compressed gas is decompressed and released in the decompression chamber, driving the impeller to rotate, and finally the gas is discharged through the gas outlet;

[0022] The condensed water is collected on the inner wall of the chamber under the action of centrifugal force, and then discharged through the drainage system.

[0023] The gas condensate recovery device and method have at least the following advantages:

[0024] Whether the water in the gas condenses or not is not only related to the temperature of the gas, but also to the pressure of the gas. When the pressure decreases, the water in the gas will evaporate. Conversely, when the pressure increases, the water vapor will condense into water after reaching saturation. In the present application, the gas is pressurized in the booster chamber, and the gas condenses to separate out water. The condensed water is collected on the inner wall of the chamber under the action of centrifugal force, and then discharged through the drainage system. In the above-mentioned gas condensate water recovery device and method, the state of the gas entering and leaving the chamber resonates between high pressure and low pressure, and very little work is required to be input from the outside. At the same time, the gas can drive the propeller blades to rotate, thereby reducing the energy consumption of recovered water and improving economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the specific implementation of the present invention, the following will briefly introduce the drawings required for use in the specific implementation. In all the drawings, each element or part is not necessarily drawn according to the actual scale.

[0026] Figure 1 This is a schematic structural diagram of a gas condensate recovery device in one embodiment;

[0027] Figure 2 It is a schematic structural diagram of a gas condensate recovery device in another embodiment;

[0028] Figure 3 It is a schematic diagram of the air inlet being tangent to the chamber;

[0029] Figure 4 is a schematic diagram showing that the gas outlet is tangent to the chamber;

[0030] Figure 5 The present invention is a flow chart of a method for recovering gas condensate in one embodiment.

[0031] Reference numerals:

[0032] 10-pump housing, 11-chamber, 12-air inlet, 13-air outlet, 20-drainage system, 22-capillary drainage pipe, 24-drainage main pipe, 30-rotating shaft, 40-propeller blade, 42-boosting blade, 44-decompression blade, 50-rotating power source, 62-boosting chamber, 64-decompression chamber, 72-liquid inlet, 74-liquid outlet. DETAILED DESCRIPTION

[0033] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the invention is not limited by the specific implementation disclosed below.

[0034] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0036] See also Figure 1 and Figure 2 The gas condensate recovery device in one embodiment is mainly used to recover moisture in humid gas. Specifically, the gas condensate recovery device includes a pump housing 10, a drainage system 20, a rotating shaft 30 and a propeller blade 40.

[0037] The pump housing 10 is provided with a chamber 11, and an air inlet 12 and an air outlet 13 are provided on the pump housing 10, and both the air inlet 12 and the air outlet 13 are connected to the chamber 11. The external gas can enter the chamber 11 through the air inlet 12, and the gas entering the chamber 11 can be discharged from the air outlet 13. Specifically, the air inlet 12 and the air outlet 13 are respectively located at two ends of the pump housing 10.

[0038] See also Figure 3 and Figure 4 In one embodiment, the chamber 11 is cylindrical, and the air inlet 12 and the air outlet 13 are tangent to the inner wall of the chamber 11, so that the gas enters and exits along the tangent of the chamber 11, which can maximize the use of the kinetic energy of the gas, drive the propeller blades 40 to rotate, and reduce the device's energy consumption requirements for the outside world.

[0039] Please refer again Figure 1 and Figure 2 The drainage system 20 is installed on the pump housing 10, and the drainage system 20 is used to discharge the condensed water in the chamber 11. In one embodiment, the drainage system 20 includes a capillary drainage pipe 22 and a drainage main pipe 24. The capillary drainage pipe 22 is installed on the pump housing 10, and one end of the capillary drainage pipe 22 extends into the chamber 11, so that the capillary drainage pipe 22 is connected to the chamber 11 to discharge the condensed water in the chamber 11. There are multiple groups of capillary drainage pipes 22, and the multiple groups of capillary drainage pipes 22 are arranged at intervals on the pump housing 10. The other ends of the multiple groups of capillary drainage pipes 22 are connected to the drainage main pipe 24, and the drainage main pipe 24 can achieve the confluence of condensed water.

[0040] The rotating shaft 30 is rotatably arranged in the chamber 11, and the rotating shaft 30 extends out of the pump housing 10 for connection with the rotating power source 50. In one embodiment, the rotating shaft 30 extends along the length direction of the pump housing 10, and the axis of the rotating shaft 30 is coaxial with the axis of the chamber 11. The rotating power source 50 can be a direct power source or an indirect power source. The direct power source can be a motor, and the indirect power source can be a transmission structure. The external motor drives the rotating shaft 30 to rotate through the transmission structure. For example, the indirect power source can be a turntable.

[0041] The propeller blade 40 is disposed on the rotating shaft 30 and rotates under the drive of the rotating shaft 30. After the external gas enters the chamber 11, it spirally flows toward one side of the gas outlet 13 under the push of the propeller blade 40, and finally is discharged from the gas outlet 13.

[0042] The propeller blades 40 include a boost blade 42 and a decompression blade 44 arranged in sequence along the gas flow direction. That is, the boost blade 42 is close to the air inlet 12, and the decompression blade 44 is close to the air outlet 13, and the gas flows through the boost blade 42 first, and then flows through the decompression blade 44.

[0043] The boosting blade 42 cooperates with the inner wall of the chamber 11 to form a boosting chamber 62. The gas is pressurized and compressed in the boosting chamber 62, the compression energy of the gas is increased, and the water in the gas condenses out. The decompression blade 44 cooperates with the inner wall of the chamber 11 to form a decompression chamber 64. The gas expands and decompresses gradually in the decompression chamber 64, driving the impeller of the propeller blade 40 to rotate, and the gas returns to normal pressure. The condensed water is gathered on the inner wall of the chamber 11 under the action of centrifugal force, and then flows to the bottom of the chamber 11 under the action of gravity and is discharged by the drainage system 20.

[0044] In one embodiment, the impeller of the boost blade 42 gradually increases in radius along the gas flow direction, and the area of ​​the flow passage between the impeller and the inner wall of the chamber 11 remains unchanged. When the area of ​​the flow passage remains unchanged, the larger the impeller radius, the higher the pressure, and as the gas flows toward the gas outlet 13, the gas is gradually pressurized.

[0045] In one embodiment, the impeller of the pressure reducing blade 44 gradually decreases in radius along the gas flow direction, and the area of ​​the flow passage between the impeller and the inner wall of the chamber 11 remains unchanged. When the area of ​​the flow passage remains unchanged, the smaller the impeller radius, the lower the pressure. As the gas flows toward the gas outlet 13, the gas gradually expands and releases the pressure to return to normal.

[0046] On the basis of the above embodiments, further, the shape of the pump casing 10 matches the shape change of the impeller, that is, the pump casing 10 is thick in the middle and thin at both ends. At this time, condensate water gathers at the middle bottom of the pump casing 10, and the drainage system 20 is arranged in the middle of the pump casing 10, which can facilitate the discharge of condensate water through the drainage system 20.

[0047] In another embodiment, the pitch of the booster blade 42 gradually decreases along the gas flow direction, and the area of ​​the flow passage between the impeller and the inner wall of the chamber 11 gradually decreases along the gas flow direction. The area of ​​the flow passage gradually decreases along the gas flow direction. At this time, the smaller the impeller pitch, the higher the pressure. As the gas flows toward the gas outlet 13, the gas is gradually pressurized.

[0048] In another embodiment, the impeller pitch of the pressure reducing blade 44 gradually increases along the gas flow direction, and the flow passage area between the impeller and the inner wall of the chamber 11 gradually increases along the gas flow direction. Among them, the flow passage area gradually increases along the gas flow direction. At this time, the greater the impeller pitch, the lower the pressure. As the gas flows toward the gas outlet 13, the gas gradually expands and releases the pressure to return to normal.

[0049] On the basis of the above embodiment, further, the diameter of the pump housing 10 of this embodiment remains unchanged, and the pump housing 10 is tilted, and the condensed water is collected at the relatively low end of the pump housing 10. The drainage system 20 is arranged at the relatively low end of the pump housing 10, which can facilitate the discharge of condensed water.

[0050] Therefore, it can be seen from the above embodiments that the pressure can be changed by changing the radius of the impeller or by changing the area of ​​the flow passage, or by combining the two. Among them, changing the pressure by changing the radius of the impeller is suitable for dehydration occasions with relatively small pressure changes. Changing the pressure by changing the pitch of the impeller, thereby changing the area of ​​the flow passage, is suitable for dehydration occasions with relatively large pressure changes.

[0051] In one embodiment, the structures of the boost paddle 42 and the decompression paddle 44 may be the same, and the boost paddle 42 and the decompression paddle 44 are symmetrically arranged, that is, the boost paddle 42 and the decompression paddle 44 are symmetrically arranged about the dividing line between the boost chamber 62 and the decompression chamber 64 .

[0052] It should be understood that in another embodiment, the pressure change can be achieved by combining the method of changing the impeller radius and the method of changing the impeller pitch. That is, the boosting blade 42 increases the impeller radius and reduces the pitch to achieve boosting, while the decompression blade 44 reduces the impeller radius and increases the pitch to achieve decompression, which can improve the boosting and decompression effects.

[0053] In one embodiment, the gas condensate recovery device further includes a heat balance system, wherein the fluid medium of the heat balance system takes away the heat in the gas compression process and provides heat for the gas expansion. The condensation and discharge of water in the gas will release some heat, and the gas will also release some heat when it is compressed. After the heat meets the gas expansion heat absorption condition, the excess heat is discharged from the system.

[0054] On the basis of the above embodiment, further, a fluid channel (not shown) is provided in the pump housing 10, and the pump housing 10 is also provided with a liquid inlet 72 and a liquid outlet 74, and the fluid medium enters the fluid channel through the liquid inlet 72 and then is discharged from the liquid outlet 74. Among them, the liquid inlet 72 corresponds to the position of the decompression chamber 64, the liquid outlet 74 corresponds to the position of the pressurization chamber 62, and the fluid channel is arranged outside the chamber 11.

[0055] In one embodiment, the fluid medium may be water. The fluid medium entering the liquid inlet 72 absorbs heat on the side of the decompression chamber 64 to satisfy the heat absorption of gas expansion, and then the fluid medium absorbs part of the heat released by condensation of water in the gas in the pressurization chamber 62, and then is discharged from the liquid outlet 74, and then passed into the liquid inlet 72 through the pipeline to realize the circulation of the fluid medium.

[0056] See also Figure 5 The present invention also provides a method for recovering gas condensate. To implement the method, the above-mentioned gas condensate recovery device is used. Specifically, the method comprises the following steps:

[0057] Step S110: the rotating shaft 30 drives the propeller blade 40 to rotate.

[0058] Specifically, the device can be equipped with a motor, or after the device is placed in place, the motor is connected to the rotating shaft 30. Then the motor is started, the motor drives the rotating shaft 30 to rotate, and the rotation of the rotating shaft 30 drives the propeller blade 40 to rotate.

[0059] Step S120: The gas enters the boost chamber 62 through the gas inlet 12, the gas is pressurized and compressed in the boost chamber 62, and the gas condenses to separate water.

[0060] Specifically, the gas enters the chamber 11 through the air inlet 12, and the gas spirally flows toward one side of the air outlet 13 under the propulsion of the propeller blade 40. During the flow of the gas in the boost chamber 62, the gas is gradually pressurized and compressed in the boost chamber 62, the compression energy of the gas is increased, and the water in the gas is condensed and precipitated.

[0061] Step S130 : the gas enters the decompression chamber 64 , the compressed gas is decompressed and released in the decompression chamber 64 , driving the impeller to rotate, and finally the gas is discharged through the gas outlet 13 .

[0062] Specifically, after the gas enters the decompression chamber 64 , the compression energy of the gas is gradually released, the gas drives the impeller to rotate, and finally the gas is discharged through the gas outlet 13 .

[0063] Step S140 : The condensed water is collected on the inner wall of the chamber 11 under the action of centrifugal force, and then discharged through the drainage system 20 .

[0064] Specifically, the condensed water is collected on the inner side of the pump housing 10 under the action of centrifugal force, and then flows to the capillary drain pipe 22 under the action of gravity. A plurality of capillary drain pipes 22 converge into the drain main pipe 24 for centralized discharge.

[0065] In the above-mentioned gas condensate water recovery device and method, the state of the gas entering and exiting the pump housing 10 resonates between high pressure and low pressure, and very little work is required from the outside to input, thereby reducing the energy consumption of water recovery. Among them, resonance is also called simple harmonic oscillation. An absolutely ideal resonant state does not exist. Physical processes close to the resonant state are widely used. For example, a pendulum continuously converts kinetic energy and potential energy during its swing, but the energy requirements from the outside are very low, and ordinary wall clock batteries can be used for several months. LC oscillations in electronic circuits also belong to resonant systems, which can provide stable radio wave signals. Since the gas is compressible, similar to a spring system, the energy state of the gas can also be freely switched between pressure energy and kinetic energy instantly.

[0066] At the same time, the gas itself can also drive the propeller blades 40 to rotate, further reducing the energy consumption of water recovery and improving economic benefits. The condensation and discharge of water in the gas will release some heat, and the gas will also release some heat when it is compressed. After the heat meets the gas expansion heat absorption condition, the excess heat is discharged from the system to achieve system thermal balance.

[0067] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention.

Claims

1. A gas condensate recovery device, characterized in that: include: A pump housing, wherein the pump housing is provided with a chamber, and the pump housing is also provided with an air inlet and an air outlet communicated with the chamber; A drainage system, installed on the pump housing, the drainage system is used to discharge condensed water in the chamber; A rotating shaft is rotatably arranged in the chamber, and the rotating shaft extends out of the pump housing to be connected to a rotating power source; and Propeller blades are arranged on the rotating shaft, and the propeller blades include a pressurizing blade and a decompression blade arranged in sequence along the gas flow direction, the pressurizing blade cooperates with the inner wall of the chamber to form a pressurizing chamber to pressurize the gas to condense water, and the decompression blade cooperates with the inner wall of the chamber to form a decompression chamber to decompress the gas, so that the gas state resonates between high pressure and low pressure; It also includes a heat balance system, in which the fluid medium of the heat balance system takes away the heat during the compression of the gas and provides the gas with heat for expansion and absorption.

2. The gas condensate recovery device according to claim 1, characterized in that: The radius of the impeller of the booster blade gradually increases along the gas flow direction, and the area of ​​the flow channel between the impeller and the inner wall of the chamber remains unchanged.

3. The gas condensate recovery device according to claim 1, characterized in that: The radius of the impeller of the pressure reducing blade gradually decreases along the gas flow direction, and the area of ​​the flow passage between the impeller and the inner wall of the chamber remains unchanged.

4. The gas condensate recovery device according to claim 2 or 3, characterized in that: The shape of the pump casing matches the profile change of the impeller, and the drainage system is arranged in the middle of the pump casing.

5. The gas condensate recovery device according to claim 1, characterized in that: The pitch of the impeller of the booster blade gradually decreases along the gas flow direction, and the area of ​​the flow channel between the impeller and the inner wall of the chamber gradually decreases along the gas flow direction.

6. The gas condensate recovery device according to claim 5, characterized in that: The pitch of the impeller of the pressure reducing blade gradually increases along the gas flow direction, and the area of ​​the flow passage between the impeller and the inner wall of the chamber gradually increases along the gas flow direction.

7. The gas condensate recovery device according to claim 5 or 6, characterized in that: The diameter of the pump casing remains unchanged, and the pump casing is arranged obliquely, and the drainage system is arranged at a relatively lower end of the pump casing.

8. The gas condensate recovery device according to claim 1, characterized in that: The pressurizing paddles and the decompression paddles are symmetrically arranged about a dividing line between the pressurizing chamber and the decompression chamber.

9. A method for recovering gas condensate, using the gas condensate recovery device according to any one of claims 1 to 8, characterized in that: The following steps are involved: The rotating shaft drives the propeller blade to rotate; The gas enters the pressurized chamber through the air inlet, the gas is pressurized and compressed in the pressurized chamber, and the gas condenses to separate water; The gas enters the decompression chamber, the compressed gas is decompressed and released in the decompression chamber, driving the impeller to rotate, and finally the gas is discharged through the gas outlet; The condensed water is collected on the inner wall of the chamber under the action of centrifugal force, and then discharged through the drainage system.

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