CN110005610B - Interstage bleed air compressor - Google Patents
Interstage bleed air compressor Download PDFInfo
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- CN110005610B CN110005610B CN201810007818.4A CN201810007818A CN110005610B CN 110005610 B CN110005610 B CN 110005610B CN 201810007818 A CN201810007818 A CN 201810007818A CN 110005610 B CN110005610 B CN 110005610B
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- Prior art keywords
- compressor
- stage compressor
- air
- bleed
- compressed air
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C23/00—Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids
- F04C23/008—Hermetic pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C28/00—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids
- F04C28/02—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids specially adapted for several pumps connected in series or in parallel
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C28/00—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids
- F04C28/24—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids characterised by using valves controlling pressure or flow rate, e.g. discharge valves or unloading valves
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Applications Or Details Of Rotary Compressors (AREA)
- Control Of Positive-Displacement Pumps (AREA)
- Control Of Positive-Displacement Air Blowers (AREA)
Abstract
An interstage bleed-off air compressor comprises a first-stage compressor body, a second-stage compressor body connected in series with the first-stage compressor body and an interstage bleed-off device. One end of the interstage bleed device is connected to a first stage compressor air inlet of the first stage compressor body, and the other end of the interstage bleed device is connected to an interstage bleed device interface between the first stage compressor body and the second stage compressor body, so that the flow of compressed air flowing back to the first stage compressor air inlet is adjusted according to the outlet pressure of the interstage bleed air compressor, and the efficiency of the interstage bleed air compressor is further improved.
Description
Technical Field
The invention relates to an air compressor. And more particularly to an interstage bleed air compressor.
Background
Air compressors are widely used in factories to provide compressed air required in the manufacturing process of factories. A screw air compressor has two rotors mounted in a compression chamber. Each rotor has helical blades and grooves to engage with each other to form a desired compression space. In these compression spaces, the gas is gradually compressed and discharged from the inlet to the outlet of the screw air compressor.
During the suction phase, the compression space is connected to the inlet of the screw air compressor, while during the compression phase the volume of the gas contained in the compression space will gradually decrease, and during the discharge phase the compression space is connected to the outlet of the screw air compressor. Screw air compressors are also often provided with control valves to effectively regulate the built-in volume ratio of the compressor.
The air compressor may provide high pressure gas required by heavy equipment in a plant. Moreover, the efficiency of the air compressor is also one of the important indicators of energy consumption in the whole plant. Therefore, there is a need to provide a more efficient air compressor to effectively reduce the amount of energy consumption required in a plant.
Disclosure of Invention
In view of this, the present invention discloses an interstage bleed-off type air compressor having an interstage bleed-off device, so as to effectively increase the energy saving effect of the interstage bleed-off type air compressor.
The interstage bleed air compressor comprises a first stage compressor body, a second stage compressor body connected in series with the first stage compressor body and an interstage bleed device. One end of the interstage bleed device is connected to a first-stage compressor air inlet of the first-stage compressor body, and the other end of the interstage bleed device is connected to an interstage bleed device interface between the first-stage compressor body and the second-stage compressor body.
The interstage bleed device comprises a bleed line connected between the first stage compressor inlet and the interstage bleed device interface, and a proportional flow control valve disposed in the bleed line.
In addition, the interstage bleed device also comprises a control device for controlling the opening degree of the proportional flow control valve.
In one embodiment, the interstage bleed air compressor further comprises an oil and gas tank connected to the second stage compressor body for storing a compressed air, and a pressure maintaining valve connected to a compressed air outlet of the oil and gas tank.
In one embodiment, the control device adjusts the opening of the proportional flow control valve according to a pressure value of the compressed air outlet.
In one embodiment, the interstage bleed air compressor further comprises a compressor inlet valve disposed at the first stage compressor inlet.
In one embodiment, when the opening of the proportional flow control valve is adjusted to the maximum and the pressure value of the compressed air outlet is still continuously increased, the control device adjusts the opening of the compressor air inlet valve to reduce the compressor air intake amount.
In one embodiment, when the pressure value of the compressed air outlet is greater than a first predetermined pressure value, the control device further adjusts the opening of the compressor intake valve to reduce the compressor intake air amount.
In one embodiment, the control device closes the proportional flow control valve when the pressure value of the compressed air outlet is less than a second predetermined pressure value.
Therefore, the interstage bleed air compressor can adjust the air inflow required by the second-stage compressor according to the pressure at the outlet of the compressor, and the compressed air of the first-stage compressor flows back to the air inlet of the first-stage compressor, so that the efficiency of the air compressor is improved, and when the flow of the required compressed air is further reduced, the air inlet valve of the first-stage compressor can be further adjusted, so that the integral air inflow is reduced. Further, as the flow of compressed gas required increases, the interstage bleed may be shut off to avoid reducing the outlet pressure of the compressor.
Drawings
The foregoing and other objects, features, advantages and embodiments of the disclosure will be apparent from the following more particular description of the embodiments, as illustrated in the accompanying drawings in which:
fig. 1 is a schematic diagram of an interstage bleed air compressor according to an embodiment of the invention.
Detailed Description
The following detailed description of the embodiments with reference to the accompanying drawings is provided for purposes of illustration only and is not intended to limit the scope of the present disclosure, which is to be construed as a limitation on the scope of the disclosure, and any structures described as a combination of elements in any claim that results in a device having equivalent functionality will be included in the present disclosure. In addition, the drawings are for illustrative purposes only and are not drawn to scale. For ease of understanding, the same or similar elements will be designated by the same reference numerals in the following description.
Furthermore, the terms (terms) used throughout the specification and claims have the ordinary meaning as is accorded to each term commonly employed in the art, in the context of this disclosure and in the context of particular applications, unless otherwise indicated. Certain terms used to describe the present disclosure will be discussed below or elsewhere in this specification to provide additional guidance to those skilled in the art in describing the present disclosure.
In the description and claims, the terms "a" and "an" can be used broadly to refer to a single or to a plurality of elements, unless the context specifically states the article. The numbers used in the steps are only used for indicating the steps for convenience of description, and are not used for limiting the sequence and the implementation manner.
Furthermore, as used herein, the terms "comprising," "including," "having," "containing," and the like are open-ended terms that mean including, but not limited to.
Referring to fig. 1, a schematic diagram of an interstage bleed air compressor according to an embodiment of the invention is shown. As shown, the interstage bleed air compressor 100 includes a first stage compressor body 120, a second stage compressor body 140, and an interstage bleed apparatus 200.
The first stage compressor body 120 is serially connected to the second stage compressor body 140, and one end of the interstage bleed device 200 is connected to a first stage compressor inlet 110 of the first stage compressor body 120, and the other end is connected to an interstage bleed device interface 130 between the first stage compressor body 120 and the second stage compressor body 140. In other words, the other end of the interstage bleed device 200 is disposed intermediate the compressed gas outlet of the first stage compressor body 120 and the gas inlet of the second stage compressor body 140.
Interstage bleed apparatus 200 includes a bleed line 190 and a proportional flow control valve 150. Bleed line 190 is connected between first stage compressor inlet 110 and interstage bleed device interface 130. The proportional flow control valve 150 is disposed in the drain line 190.
Thus, when the amount of discharge air required by interstage bleed air compressor 100 is below a nominal discharge air amount such that the pressure at compressed air outlet 220 increases, the excess discharge air amount may be advanced by interstage bleed 200 to end the compression stroke and returned to first stage compressor inlet 110 to conserve power from subsequent pressure increases. Therefore, the effect of saving energy consumption is more remarkable as the rated discharge pressure of the second stage compressor body 140 is higher.
The energy saving effect of interstage bleed air compressor 100 will be practically described in one embodiment as follows:
P A ＝Q A P B
wherein, P A : saved power, Q A : saved displacement, P B The unit power saved by ending compression in advance.
Taking an air compressor as an example, the full load displacement is 42.69m 3 Min, power measurement 232.3 KW. When interstage bleed device 200 is installed, the displacement of the air compressor is 38.99m 3 At/min, the power consumption was measured to be 223.1 KW. The adiabatic power of the air compressor with two-stage compression is 4.02 KW/(m) at 0.7MPa 3 Min); the adiabatic power at 0.2MPa is 2.128 KW/(m) 3 /min), assuming an adiabatic efficiency of 76%, a reduction of 3.7m calculated according to the following formula 3 The energy consumption of 9.2KW (8.6% of full load power) can be saved by/min (8.6% of full load exhaust), which is similar to the data measured actually.
P A ＝Q A P B ＝(Q N -Q S )*((P N -P J )/η ad )
＝(42.69-38.99)*((4.02-2.128)/0.76)
≒232.3-223.1＝9.2KW
Q A ＝Q N -Q S
Wherein Q is N To full load displacement, Q S Actual displacement.
P B ＝(P N -P J )/η ad
Wherein, P N : adiabatic power at rated pressure, P J Adiabatic power of inter-stage discharge port pressure, eta ad : adiabatic efficiency of the compressor.
Thus, the percentage energy savings calculation is about: (42.69-38.99)/42.69 ═ 8.6%; (232.3-223.1)/232.3 ═ 3.96%.
Compared with the conventional air compressor, the interstage bleed air compressor 100 disclosed by the invention can effectively save two times of energy consumption under the condition of reducing the same air displacement, namely, reducing the full load air displacement by 8.6%, thereby having obvious energy saving advantage.
In one embodiment, interstage bleed apparatus 200 further comprises a control apparatus 160 via line 196 to control the opening of proportional flow regulator valve 150.
In one embodiment, the interstage bleed air compressor 100 further comprises an oil and gas tank 170 connected to the second stage compressor body 140 via a gas line 194 for storing a compressed air.
In one embodiment, the interstage bleed air compressor 100 further comprises a pressure maintenance valve 180 connected to a compressed air outlet 220 of the oil and gas barrel 170.
In one embodiment, the control device 160 adjusts the opening of the proportional flow control valve 150 according to a pressure value of the compressed air outlet 220, for example, when the pressure value increases, the opening of the proportional flow control valve 150 is increased to increase the backflow amount, and when the pressure value decreases, the opening of the proportional flow control valve 150 is decreased to decrease the backflow amount.
In one embodiment, the interstage bleed air compressor 100 further comprises a compressor inlet valve 102 disposed at the first stage compressor inlet 110.
Therefore, when the opening degree of the proportional flow rate adjusting valve 150 is adjusted to the maximum while the pressure value of the compressed air outlet 220 is continuously increased, the opening degree of the compressor intake valve 102 is further adjusted to reduce the intake air amount of the compressor.
In one embodiment, when the pressure at the compressed air outlet 220 increases due to a decrease in the output flow, the control device 160 will increase the opening of the proportional flow control valve 150. When the pressure of the compressed air outlet 220 is still continuously increased to a first predetermined pressure value, for example, a two-stage compressor with a rated outlet pressure of 0.7MPa, when the outlet pressure is greater than 0.8MPa, the control device 160 further reduces the opening degree of the compressor air intake valve 102 through the line 198 to reduce the amount of air sucked by the compressor from the air inlet 210, so as to further adjust and reduce the pressure of the compressed air outlet 220.
In one embodiment, when the pressure value of the compressed air outlet 220 is smaller than a second predetermined pressure value, for example, a two-stage compressor with a rated outlet pressure of 0.7MPa, when the outlet pressure is smaller than 0.6MPa, the control device 160 will close the proportional flow control valve 150 to avoid further reducing the pressure of the compressed air outlet 220.
In one embodiment, when the pressure at the compressed air outlet 220 is greater than the nominal pressure plus 15% of the nominal pressure, the control device 160 further decreases the opening of the compressor inlet valve 102 via line 198 to decrease the amount of air drawn by the compressor through the gas inlet 210. When the pressure value of the compressed air outlet 220 is less than the nominal pressure minus 15%, the control device 160 closes the proportional flow control valve 150 to avoid further lowering of the pressure of the compressed air outlet 220.
To sum up, the interstage bleed-off air compressor can adjust the air inflow required by the second stage compressor according to the pressure at the outlet of the compressor, and the compressed air of the first stage compressor flows back to the air inlet of the first stage compressor, so that the efficiency of the air compressor is improved, and when the flow of the required compressed air is further reduced, the air inlet valve of the first stage compressor can be further adjusted, so that the overall air inflow is reduced. Further, as the flow of compressed gas required increases, the interstage bleed may be shut off to avoid reducing the outlet pressure of the compressor.
Although the present disclosure has been described with reference to particular embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present disclosure, and therefore the scope of the present disclosure should be determined only by the appended claims.
Claims (3)
1. An interstage bleed air compressor, comprising:
a first stage compressor body;
the second-stage compressor body is connected in series with the first-stage compressor body;
bleed device between one-level, one end is connected in a first stage compressor air inlet of this first stage compressor body, and the other end is connected in bleed device interface between one-level between this first stage compressor body and this second stage compressor body, and wherein this inter-stage bleed device contains:
a bleed line connected between the first stage compressor inlet and the interstage bleed apparatus interface;
a proportional flow control valve, which is arranged in the discharge pipeline; and
a control device;
an oil gas barrel is connected with the second-stage compressor body to store compressed air;
a pressure maintaining valve is connected with a compressed air outlet of the oil gas barrel, wherein the control device adjusts the opening degree of the proportional flow regulating valve according to a pressure value of the compressed air outlet of the oil gas barrel; and
and the control device adjusts the opening degree of the compressor air inlet valve to reduce the air inflow of the compressor when the opening degree of the proportional flow control valve is adjusted to be maximum and the pressure value of the compressed air outlet is still continuously increased.
2. The interstage bleed air compressor of claim 1, wherein the control device further adjusts an opening of the compressor inlet valve to reduce the compressor inlet air flow when the pressure value of the compressed air outlet is greater than a first predetermined pressure value.
3. The interstage bleed air compressor of claim 2, wherein the control device closes the proportional flow regulator valve when the pressure value of the compressed air outlet is less than a second predetermined pressure value.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810007818.4A CN110005610B (en) | 2018-01-04 | 2018-01-04 | Interstage bleed air compressor |
| TW107101584A TWI663334B (en) | 2018-01-04 | 2018-01-16 | Inter-stage discharge air compressor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810007818.4A CN110005610B (en) | 2018-01-04 | 2018-01-04 | Interstage bleed air compressor |
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| Publication Number | Publication Date |
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| CN110005610A CN110005610A (en) | 2019-07-12 |
| CN110005610B true CN110005610B (en) | 2022-07-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810007818.4A Active CN110005610B (en) | 2018-01-04 | 2018-01-04 | Interstage bleed air compressor |
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| CN (1) | CN110005610B (en) |
| TW (1) | TWI663334B (en) |
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| CN106438364A (en) * | 2016-12-13 | 2017-02-22 | 萨震压缩机（上海）有限公司 | Compression ratio adjustable two-stage energy-saving air compressor |
| CN107035671A (en) * | 2017-06-23 | 2017-08-11 | 山河智能装备股份有限公司 | A kind of air compressor air intake control system and its control method |
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| JPS62688A (en) * | 1985-06-26 | 1987-01-06 | Kobe Steel Ltd | Capacity adjusting method for double-stage screw compressor |
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| CN102650277B (en) * | 2011-02-28 | 2016-11-16 | 浙江三花制冷集团有限公司 | Compound compressor and relief valve |
| US9797299B2 (en) * | 2015-11-02 | 2017-10-24 | Hansen Engine Corporation | Supercharged internal combustion engine |
| JP6670645B2 (en) * | 2016-03-16 | 2020-03-25 | 株式会社日立産機システム | Multi-stage compressor |
| CN107044437A (en) * | 2017-05-22 | 2017-08-15 | 无锡商业职业技术学院 | The regulation and control system of compound compressor |
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2018
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- 2018-01-16 TW TW107101584A patent/TWI663334B/en active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03185293A (en) * | 1989-12-15 | 1991-08-13 | Hitachi Ltd | Displacement compressor rotating screw |
| CN1463331A (en) * | 2001-06-22 | 2003-12-24 | Ghh-兰德旋转式压缩机有限责任公司 | Two-stage helical screw compressor |
| CN201176916Y (en) * | 2007-09-19 | 2009-01-07 | 复盛股份有限公司 | Compressor outlet valve assembly |
| CN201786608U (en) * | 2010-08-24 | 2011-04-06 | 李军 | Energy-saving air compressor |
| CN104747453A (en) * | 2015-02-07 | 2015-07-01 | 宁波鲍斯能源装备股份有限公司 | Two-stage screw compressor discharge pressure stabilizing device and two-stage screw compressor discharge pressure stabilizing method |
| CN106438364A (en) * | 2016-12-13 | 2017-02-22 | 萨震压缩机（上海）有限公司 | Compression ratio adjustable two-stage energy-saving air compressor |
| CN107035671A (en) * | 2017-06-23 | 2017-08-11 | 山河智能装备股份有限公司 | A kind of air compressor air intake control system and its control method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110005610A (en) | 2019-07-12 |
| TW201930727A (en) | 2019-08-01 |
| TWI663334B (en) | 2019-06-21 |
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