CN112762004A - Anti-surge device of centrifugal compressor - Google Patents
Anti-surge device of centrifugal compressor Download PDFInfo
- Publication number
- CN112762004A CN112762004A CN202110213598.2A CN202110213598A CN112762004A CN 112762004 A CN112762004 A CN 112762004A CN 202110213598 A CN202110213598 A CN 202110213598A CN 112762004 A CN112762004 A CN 112762004A
- Authority
- CN
- China
- Prior art keywords
- compressor
- stage
- air inlet
- final
- cooler
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/02—Surge control
- F04D27/0276—Surge control by influencing fluid temperature
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/58—Cooling; Heating; Diminishing heat transfer
- F04D29/582—Cooling; Heating; Diminishing heat transfer specially adapted for elastic fluid pumps
- F04D29/5826—Cooling at least part of the working fluid in a heat exchanger
- F04D29/5833—Cooling at least part of the working fluid in a heat exchanger flow schemes and regulation thereto
Abstract
The invention relates to an anti-surge device of a centrifugal compressor. The invention comprises a first-stage air inlet pressure gauge, a first-stage pressure remote transmitter, an automatic regulating valve, a unit return pipeline, a last-stage exhaust pressure gauge and a last-stage pressure remote transmitter. The device is connected with a compressor unit to realize surge prevention of the centrifugal compressor. The invention automatically controls the backflow of the centrifugal compressor by utilizing the compression ratio of the inlet and the outlet of the compressor so as to prevent the surge of the compressor. The influence of the air inlet condition and the air outlet condition is comprehensively considered, so that the condition that the assumed condition for controlling the backflow of the compressor cannot exist stably due to the fact that the air inlet state of the compressor deviates from the designed value is avoided, and the situation that equipment already surges when the equipment does not reach the expected backflow condition is very likely to occur. Compared with other centrifugal compressor backflow anti-surge methods, the method has the advantages that a plurality of field and remote pressure data can be compared, and the method is more effective, practical and reliable.
Description
Technical Field
The invention belongs to the technical field of centrifugal compressors, and relates to an anti-surge device of a centrifugal compressor.
Background
The basic working principle of the centrifugal compressor is that the impeller rotating at high speed applies work to gas, so that the pressure of the gas is increased and the speed is increased by mechanical energy. After leaving the impeller, the gas flows through the diffuser for speed reduction and pressure expansion, so that the kinetic energy of the gas is converted into pressure energy, and the compression process is completed.
When the flow rate of the centrifugal compressor is excessively reduced, a stall phenomenon occurs in the gas with respect to the impeller flow passage, and the gas flow rate and the discharge pressure of the compressor periodically fluctuate at a low frequency and a large amplitude, thereby causing strong vibration of the machine, which is called surging of the compressor. Surge is an inherent characteristic of centrifugal compressors and occurs when the flow rate is small to a certain limit for any one centrifugal compressor. When the compressor surges, each running part of the compressor can generate serious vibration, friction and impact, so that serious damage such as abrasion, ablation, breakage and the like can be generated, and the situation that each link of design, manufacture, operation and the like of the centrifugal compressor needs to be strictly prevented.
At present, centrifugal compressors are all provided with unit backflow (commonly called small backflow) so as to facilitate parallel off-line operation during start and stop, adjust unit output flow and prevent compressor surging. The existing unit backflow operation modes comprise manual operation and automatic operation, wherein the manual operation is mainly used for large-flow circulation before grid connection and after grid disconnection of the unit, the automatic operation is a normal control mode during daily operation of a compressor, and the main function is to ensure necessary flow under the daily operation state of the unit so as to prevent surging of a main machine when the flow is too low.
The existing centrifugal compressor set reflux self-control mode mainly includes flow control and exhaust pressure control. However, they have the following disadvantages:
1. the intake air (pressure, temperature, etc.) state is assumed to be the design value, but in actual operation, in order to adjust the output flow of the compressor, save energy and meet the system safety requirement, the intake valve needs to be adjusted frequently, the intake state of the compressor often deviates from the design value, so that the assumed condition for controlling the backflow of the compressor cannot exist stably, and the surge is likely to occur before the equipment does not reach the expected backflow condition.
2. The flow meter matched with the compressor is not accurate, and if the flow measured by the flow meter is lower than an actual value, the automatic reflux valve of the compressor is opened when the automatic reflux valve of the compressor is not opened, so that the conveying capacity of the compressor is reduced, and the reflux of the compressor is difficult to control.
3. The flow meter is expensive and basically has no redundant design, so that the reliability of controlling the backflow of the compressor by the flow is not high.
4. In case of emergency, when the source of the inlet medium is interrupted and the system backflow (commonly called large backflow) is not in a self-control state, the inlet pressure of the compressor is rapidly reduced, and the compressor still surges even if the exhaust pressure is not high.
Aiming at the defects of the existing anti-surge method, the invention comprehensively considers the influence of the air inlet density of the centrifugal compressor on the performance (pressure and flow) of the compressor, namely the design compression ratio of the centrifugal compressor can be basically kept unchanged under the condition that the air inlet component is unchanged. The invention provides an anti-surge method for controlling the backflow of a unit by using a compression ratio (which is the ratio of the absolute pressure of the last-stage exhaust gas and the first-stage intake gas of a compressor), thereby solving the problems of the existing anti-surge automatic control mode.
Disclosure of Invention
The invention aims to provide an anti-surge device of a centrifugal compressor.
The invention comprises a first-stage air inlet pressure gauge, a first-stage pressure remote transmitter, an automatic regulating valve, a unit return pipeline, a last-stage exhaust pressure gauge and a last-stage pressure remote transmitter. The device is connected with a compressor unit to realize surge prevention of the centrifugal compressor. The compressor unit comprises a compressor, an interstage cooler and a final stage cooler;
the primary air inlet pressure gauge and the primary pressure remote transmitter are arranged on a primary air inlet pipeline of the compressor; the air inlet of the inter-stage cooler is connected with the first-stage exhaust port of the compressor, and the air outlet of the inter-stage cooler is connected with the last-stage air inlet of the compressor; the air inlet of the final cooler is connected with the final exhaust port of the compressor, and the air outlet of the final cooler is connected with the medium distribution table; a final-stage exhaust pressure gauge and a final-stage pressure remote transmitter are arranged at an air outlet of the final-stage cooler, and the air outlet of the final-stage cooler is connected with a first-stage air inlet of the compressor through a unit return pipeline to form internal circulation; the machine set reflux pipe is provided with an automatic regulating valve and a manual bypass valve, and the automatic regulating valve and the manual bypass valve are installed in parallel.
The compressor last-stage air inlet, the compressor last-stage air outlet, the compressor first-stage air outlet and the compressor first-stage air inlet are connected with a pipeline through flanges.
The air inlet of the interstage cooler, the air outlet of the interstage cooler, the air inlet of the final stage cooler and the air outlet of the final stage cooler are connected with pipelines through flanges.
The self-regulating valve is opened when the compression ratio reaches 95% of the compression ratio and closed when the compression ratio reaches 105%, and the self-regulating valve is linearly regulated.
The invention automatically controls the backflow of the centrifugal compressor by utilizing the compression ratio of the inlet and the outlet of the compressor so as to prevent the surge of the compressor. The influence of the air inlet condition and the air outlet condition is comprehensively considered, so that the condition that the assumed condition for controlling the backflow of the compressor cannot exist stably due to the fact that the air inlet state of the compressor deviates from the designed value is avoided, and the situation that equipment already surges when the equipment does not reach the expected backflow condition is very likely to occur. Because the unit generally has a plurality of on-site and remote pressure data which can be compared, the method is more effective, practical and reliable than other centrifugal compressor backflow anti-surge methods. The reflux can be controlled only by increasing the compression ratio of the unit, and the investment is hardly increased.
Drawings
FIG. 1 is a schematic diagram of the primary medium flow control of the present invention.
Detailed Description
The present invention will be further described with reference to the accompanying drawings.
As shown in figure 1, the surge-proof device of the centrifugal compressor comprises a primary air inlet pressure gauge 1, a primary pressure remote transmission transmitter 2, an automatic regulating valve 3, a unit return pipeline 4, a final exhaust pressure gauge 7 and a final pressure remote transmission transmitter 8. The device is connected with a compressor unit to realize surge prevention of the centrifugal compressor. The compressor unit comprises a compressor, an interstage cooler 5, a final stage cooler 6 and an upper computer.
The primary air inlet pressure gauge 1 and the primary pressure remote transmitter 2 are arranged on a connecting pipe of a primary air inlet 12 of the compressor, and the primary air inlet 12 of the compressor is connected with the connecting pipe through a flange; a first-stage exhaust port 11 of the compressor is connected with an air inlet of the interstage cooler 5 through a pipeline and a flange, an air outlet of the interstage cooler 5 is connected with a last-stage air inlet 9 of the compressor through a pipeline and a flange, and a last-stage exhaust port 10 of the compressor is connected with an air inlet of the last-stage cooler 6 through a pipeline and a flange; the air outlet of the final cooler 6 is connected to the medium distribution station through a pipeline and a flange, a final exhaust pressure gauge 7 and a final pressure remote transmission transmitter 8 are arranged on the connecting pipeline of the air outlet of the final cooler 6, and the air outlet is also connected with a first-stage air inlet 12 of the compressor through a set return pipeline 4 to form an internal circulation, an automatic regulating valve 3 and a manual bypass valve 13 are arranged on the set return pipeline 4, and the automatic regulating valve 3 and the manual bypass valve 13 are installed in parallel.
The device is based on the following anti-surge control method of the centrifugal compressor, and the method comprises the following specific steps:
according to design parameters, the compressor surge point compression ratio is calculated and set (can also be obtained through actual measurement of the actual operation condition on site), if the surge point compression ratio is 3.5, an alarm signal is sent out when the operation compression ratio is 3.3, when the operation compression ratio is 3.4, the automatic regulating valve is started, the flow of the compressor is increased, the operation compression ratio is reduced, the condition that the compressor enters a surge area to operate when the operation compression ratio is more than or equal to 3.5 is avoided, and when the operation compression ratio is more than or equal to 3.5, compressor unit equipment is interlocked and stopped. All the data required by the anti-surge control method are different according to different working conditions and equipment, and the set compression ratio is input into an upper computer according to the corresponding working conditions and the equipment before the equipment leaves a factory.
The use of centrifugal compressors is generally defined and unique, so that the medium composition is fixed, and on the premise that changes in the inlet pressure and temperature result in changes in the nominal flow rate and pressure raising capability of the compressor. But the compression ratio achievable by the centrifugal compressor is constant. When the impeller is designed, according to the outlet absolute pressure (namely, the outlet pressure of the compressor: 0.35MPa (A)) corresponding to the design parameter provided by a user at the rated flow, the outlet absolute pressure is divided by the given inlet absolute pressure (namely, the inlet pressure of the compressor: 0.09MPa (A)) to calculate the rated compression ratio (the obtained compression ratio is 0.35/0.09 is 3.89).
In the conventional compressor, if surge occurs or the compressor enters an unstable operation state due to a rise in the discharge pressure, the surge compression ratio is calculated from the discharge pressure at that time, and the product of the calculated surge compression ratio and the discharge pressure is multiplied by 0.9 to obtain the rated compression ratio.
At the time of setting the parameters of the automatic regulating valve, the automatic regulating valve is started to be opened when the compression ratio reaches 95% of the rated compression ratio and is closed when the compression ratio reaches 105% of the rated compression ratio, and linear regulation is carried out between the starting and the closing. The invention has the advantages of easy signal acquisition, higher data reliability, timely and reliable compressor surge prevention, and almost negligible investment increase due to improvement on the basis of normal configuration.
Claims (4)
1. An anti-surge device of a centrifugal compressor, characterized in that: the system comprises a primary air inlet pressure gauge (1), a primary pressure remote transmission transmitter (2), an automatic regulating valve (3), a unit return pipeline (4), a final-stage exhaust pressure gauge (7) and a final-stage pressure remote transmission transmitter (8); the device is connected with a compressor unit to realize surge prevention of the centrifugal compressor; the compressor unit comprises a compressor, an interstage cooler (5) and a final stage cooler (6);
the primary air inlet pressure gauge (1) and the primary pressure remote transmitter (2) are arranged on a pipeline of a primary air inlet (12) of the compressor; the air inlet of the inter-stage cooler (5) is connected with a first-stage exhaust port (11) of the compressor, and the air outlet of the inter-stage cooler (5) is connected with a last-stage air inlet (9) of the compressor; the air inlet of the final cooler (6) is connected with the final exhaust port (10) of the compressor, and the air outlet of the final cooler (6) is connected with the medium distribution table; a final-stage exhaust pressure gauge (7) and a final-stage pressure remote transmitter (8) are arranged at an air outlet of the final-stage cooler (6), and the air outlet of the final-stage cooler (6) is connected with a first-stage air inlet (12) of the compressor through a unit return pipeline (4) to form internal circulation; an automatic regulating valve (3) and a manual bypass valve (13) are arranged on the set return pipe (4), and the automatic regulating valve (3) and the manual bypass valve (13) are arranged in parallel.
2. The centrifugal compressor anti-surge apparatus of claim 1, wherein: the compressor last-stage air inlet (9), the compressor last-stage exhaust outlet (10), the compressor first-stage exhaust outlet (11) and the compressor first-stage air inlet (12) are connected with a pipeline through flanges.
3. The centrifugal compressor anti-surge apparatus of claim 1, wherein: the air inlet of the interstage cooler (5), the air outlet of the interstage cooler (5), the air inlet of the final cooler (6) and the air outlet of the final cooler (6) are connected with pipelines through flanges.
4. The centrifugal compressor anti-surge apparatus of claim 1, wherein: the self-regulating valve (3) is opened when the compression ratio reaches 95% of the compression ratio and closed when the compression ratio reaches 105%, and the self-regulating valve is linearly regulated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110213598.2A CN112762004A (en) | 2021-02-25 | 2021-02-25 | Anti-surge device of centrifugal compressor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110213598.2A CN112762004A (en) | 2021-02-25 | 2021-02-25 | Anti-surge device of centrifugal compressor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112762004A true CN112762004A (en) | 2021-05-07 |
Family
ID=75704202
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110213598.2A Pending CN112762004A (en) | 2021-02-25 | 2021-02-25 | Anti-surge device of centrifugal compressor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112762004A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113404707A (en) * | 2021-06-01 | 2021-09-17 | 开封迪尔空分实业有限公司 | A pressure boost tower for empty |
| CN114857073A (en) * | 2022-05-24 | 2022-08-05 | 浙江浙能技术研究院有限公司 | Anti-surge method for centrifugal air compressor driven by microminiature steam residual pressure |
| CN116104793A (en) * | 2023-04-14 | 2023-05-12 | 鸿陆智能科技(山东)有限公司 | MVR centrifugal vapor compressor intake anti-surge pipe |
-
2021
- 2021-02-25 CN CN202110213598.2A patent/CN112762004A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113404707A (en) * | 2021-06-01 | 2021-09-17 | 开封迪尔空分实业有限公司 | A pressure boost tower for empty |
| CN113404707B (en) * | 2021-06-01 | 2023-11-03 | 中冶南方(黄石)气体有限公司 | A booster tower for space division |
| CN114857073A (en) * | 2022-05-24 | 2022-08-05 | 浙江浙能技术研究院有限公司 | Anti-surge method for centrifugal air compressor driven by microminiature steam residual pressure |
| CN114857073B (en) * | 2022-05-24 | 2023-09-05 | 浙江浙能技术研究院有限公司 | Anti-surge method of centrifugal air compressor driven by microminiature steam residual pressure |
| CN116104793A (en) * | 2023-04-14 | 2023-05-12 | 鸿陆智能科技(山东)有限公司 | MVR centrifugal vapor compressor intake anti-surge pipe |
| CN116104793B (en) * | 2023-04-14 | 2023-08-04 | 鸿陆智能科技(山东)有限公司 | MVR centrifugal vapor compressor intake anti-surge pipe |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112762004A (en) | Anti-surge device of centrifugal compressor | |
| AU2007347705B2 (en) | Anti-bogdown control system for turbine/compressor systems | |
| CN101581252A (en) | Method for controlling set point for extracting air from compressor to provide turbine cooling air in gas turbine | |
| CN114962317B (en) | Anti-surge control method for tooth type single-stage or multi-stage centrifugal compressor | |
| WO2009058975A1 (en) | Control system | |
| CN107237770B (en) | Energy-saving and efficiency-increasing control system of blower unit and working method thereof | |
| CN105370629A (en) | Energy recycling control method for PTA device | |
| CN112254237B (en) | Air conditioner circulating water system pressure difference control system | |
| Kriel et al. | Modernising underground compressed air DSM projects to reduce operating costs | |
| CN110107525B (en) | Control method for system pressure of centrifugal air compression station | |
| EP3904690A1 (en) | Multistage centrifugal compressor with an anti-surge system and control method therefor | |
| CN101443558A (en) | Multi-stage compressor, air-separating apparatus comprising such a compressor, and installation | |
| JP5320366B2 (en) | Compression device | |
| CN202869095U (en) | Energy-adjusting cooling device | |
| CN214465055U (en) | Surge-proof device for centrifugal compressor | |
| CN108592518B (en) | Cryogenic liquefied air energy storage power generation system and start-stop control method thereof | |
| CN102840136B (en) | Steam drive type compression device | |
| CN115492787A (en) | Anti-surge control method of series centrifugal compressor unit and air conditioning equipment | |
| CN216617967U (en) | Centrifugal compressor air intake system | |
| CN112902023A (en) | Steam pipeline pressurization system and full-automatic control method thereof | |
| CN111023608A (en) | Refrigerating unit with low energy consumption, high efficiency and stability and capable of preventing surge | |
| RU206992U1 (en) | CRANE LINING OF RECIRCULATION LINE OF COMPRESSOR STATION | |
| CN116733769A (en) | Load distribution control method for series compressor unit | |
| Bryant | Complex compressor station modeling | |
| CN114857073B (en) | Anti-surge method of centrifugal air compressor driven by microminiature steam residual pressure |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |