CN110043467A - Two-stage series connection compressor cycle reflux control system - Google Patents
Two-stage series connection compressor cycle reflux control system Download PDFInfo
- Publication number
- CN110043467A CN110043467A CN201910472241.9A CN201910472241A CN110043467A CN 110043467 A CN110043467 A CN 110043467A CN 201910472241 A CN201910472241 A CN 201910472241A CN 110043467 A CN110043467 A CN 110043467A
- Authority
- CN
- China
- Prior art keywords
- compressor
- stage
- inlet pressure
- regulating valve
- inlet
- 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.)
- Granted
Links
- 238000010992 reflux Methods 0.000 title claims description 4
- 230000001105 regulatory effect Effects 0.000 claims abstract description 53
- 238000000034 method Methods 0.000 claims abstract description 15
- 238000001514 detection method Methods 0.000 claims abstract description 4
- 238000001816 cooling Methods 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000007906 compression Methods 0.000 description 2
- 230000006835 compression Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
Classifications
-
- 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
- F04C23/001—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 of similar working principle
-
- 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
-
- 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
- F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
- F04C29/04—Heating; Cooling; Heat insulation
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Control Of Positive-Displacement Air Blowers (AREA)
- Control Of Positive-Displacement Pumps (AREA)
Abstract
一种两级串联压缩机循环回流控制系统，包括依次串联的两级压缩机、回流管路、两个压力变送器、三通调节阀和控制器，其中：两个压力变送器分别设置于两个压缩机的入口，用以分别检测两个压缩机的入口压力；三通调节阀设置在回流管路上，二级压缩机的出口与三通调节阀的入口连通，三通调节阀的两个出口分别与两个压缩机的入口连通；控制器用于接收三通调节阀反馈的阀门状态信号以及两个压力变送器发送的检测结果，控制三通调节阀的开度，以调节回流到一级压缩机和二级压缩机的工艺气流量，使一级压缩机的入口压力和二级压缩机的入口压力维持稳定。本发明使得压缩机组的运行更加安全可靠。
A two-stage series compressor circulation return control system, comprising two-stage compressors connected in series, a return pipeline, two pressure transmitters, a three-way regulating valve and a controller, wherein: the two pressure transmitters are respectively set At the inlets of the two compressors, it is used to detect the inlet pressures of the two compressors respectively; the three-way regulating valve is arranged on the return line, the outlet of the secondary compressor is connected with the inlet of the three-way regulating valve, and the The two outlets are connected to the inlets of the two compressors respectively; the controller is used to receive the valve status signal fed back by the three-way regulating valve and the detection results sent by the two pressure transmitters, and control the opening of the three-way regulating valve to adjust the return flow The flow of process gas to the primary and secondary compressors maintains a constant inlet pressure to the primary and secondary compressors. The invention makes the operation of the compressor unit safer and more reliable.
Description
技术领域technical field
本发明涉及一种两级串联压缩机的循环回流技术。The invention relates to a circulating return technology of two-stage series-connected compressors.
背景技术Background technique
螺杆压缩机可靠性高、动平衡好、适应性强，如果压缩介质组成和入口状态稳定，基本压缩过程就稳定，工程应用的稳定及长效性就可得以保证。因此，现有的螺杆压缩机都配有循环回流管线，以使压缩机的出口流量部分地回流到入口，从而稳定压缩机的入口压力（即进气压力）。然而，在双级串联的压缩机组中，二级压缩机的入口压力往往被忽视，经常出现压力不稳定甚至过低的情况，从而给生产安全带来隐患。The screw compressor has high reliability, good dynamic balance and strong adaptability. If the composition of the compression medium and the inlet state are stable, the basic compression process is stable, and the stability and long-term effect of engineering applications can be guaranteed. Therefore, the existing screw compressors are all equipped with a circulating return line, so that the outlet flow of the compressor is partially returned to the inlet, thereby stabilizing the inlet pressure (ie intake pressure) of the compressor. However, in a two-stage series compressor unit, the inlet pressure of the two-stage compressor is often ignored, and the pressure is often unstable or even too low, which brings hidden dangers to production safety.
发明内容SUMMARY OF THE INVENTION
本发明所要解决的技术问题在于提供一种能够同时保证一级压缩机和二级压缩机入口压力均稳定的两级串联压缩机循环回流控制系统。The technical problem to be solved by the present invention is to provide a circulating return control system for two-stage series compressors that can simultaneously ensure stable inlet pressures of both the primary compressor and the secondary compressor.
本发明所采取的技术方案是：The technical scheme adopted by the present invention is:
一种两级串联压缩机循环回流控制系统，包括依次串联的两级压缩机以及回流管路，两级串联压缩机循环回流控制系统包括两个压力变送器、三通调节阀和控制器，其中：两个压力变送器分别设置于两个压缩机的入口，用以分别检测两个压缩机的入口压力；三通调节阀设置在回流管路上，二级压缩机的出口与三通调节阀的入口连通，三通调节阀的两个出口分别与两个压缩机的入口连通；控制器用于接收三通调节阀反馈的阀门状态信号以及两个压力变送器发送的检测结果，控制三通调节阀的开度，以调节回流到一级压缩机和二级压缩机的工艺气流量，使一级压缩机的入口压力和二级压缩机的入口压力维持稳定。A two-stage series-connected compressor circulation control system includes two-stage compressors connected in series and a return pipeline. The two-stage series-connected compressor circulation control system includes two pressure transmitters, a three-way regulating valve and a controller. Among them: two pressure transmitters are installed at the inlets of the two compressors to detect the inlet pressures of the two compressors respectively; the three-way regulating valve is installed on the return line, and the outlet of the secondary compressor is adjusted with the three-way The inlet of the valve is connected, and the two outlets of the three-way regulating valve are respectively connected with the inlets of the two compressors; the controller is used to receive the valve status signal fed back by the three-way regulating valve and the detection results sent by the two pressure transmitters, and control the three-way regulating valve. The opening degree of the regulating valve is adjusted to adjust the process gas flow back to the primary compressor and the secondary compressor, so that the inlet pressure of the primary compressor and the inlet pressure of the secondary compressor are kept stable.
可选地，在所述的两级串联压缩机循环回流控制系统中，控制器用于优先根据一级压缩机的入口压力给定值和入口压力测量值对三通调节阀的开度进行控制，以使一级压缩机的入口压力达到一级压缩机的入口压力给定值，只有在一级压缩机的入口压力测量值大于等于预先设定的第一压力阈值且二级压缩机的入口压力测量值低于预先设定的第二压力阈值时，根据二级压缩机的入口压力给定值和入口压力测量值对三通调节阀的开度进行控制，以使二级压缩机的入口压力达到二级压缩机的入口压力给定值。Optionally, in the described two-stage series compressor circulation return control system, the controller is used to preferentially control the opening of the three-way regulating valve according to the given value of the inlet pressure of the first-stage compressor and the measured value of the inlet pressure, In order to make the inlet pressure of the first stage compressor reach the given value of the inlet pressure of the first stage compressor, only when the measured value of the inlet pressure of the first stage compressor is greater than or equal to the preset first pressure threshold and the inlet pressure of the second stage compressor When the measured value is lower than the preset second pressure threshold, the opening degree of the three-way regulating valve is controlled according to the given value of the inlet pressure of the secondary compressor and the measured value of the inlet pressure, so that the inlet pressure of the secondary compressor is controlled. The inlet pressure setpoint for the secondary compressor is reached.
可选地，在所述的两级串联压缩机循环回流控制系统中，控制器用于优先根据一级压缩机的入口压力给定值与入口压力测量值的偏差对三通调节阀的开度进行PID控制，以使一级压缩机的入口压力达到一级压缩机的入口压力给定值，只有在一级压缩机的入口压力测量值大于等于预先设定的第一压力阈值且二级压缩机的入口压力测量值低于预先设定的第二压力阈值时，根据二级压缩机的入口压力给定值与入口压力测量值的偏差对三通调节阀的开度进行PID控制，以使二级压缩机的入口压力达到二级压缩机的入口压力给定值。Optionally, in the described two-stage series compressor circulatory return control system, the controller is used to preferentially adjust the opening of the three-way regulating valve according to the deviation between the given value of the inlet pressure of the first-stage compressor and the measured value of the inlet pressure. PID control, so that the inlet pressure of the first stage compressor reaches the given value of the inlet pressure of the first stage compressor, only when the measured value of the inlet pressure of the first stage compressor is greater than or equal to the preset first pressure threshold and the second stage compressor When the measured value of the inlet pressure is lower than the preset second pressure threshold, PID control is performed on the opening of the three-way regulating valve according to the deviation between the given value of the inlet pressure of the secondary compressor and the measured value of the inlet pressure, so that the two The inlet pressure of the stage compressor reaches the inlet pressure setpoint of the stage compressor.
由于本发明采用了以上的技术方案，其产生的技术效果是明显的：Because the present invention adopts the above technical scheme, the technical effect it produces is obvious:
1、与现有技术相比，本实施例的两级串联压缩机循环回流控制系统用一套三通调节阀将一路回流分成了两路回流，使两路回流量能够得到很好的控制，从而分别平衡了两级压缩机的入口压力，使两级压缩机的入口压力均能保持稳定，不仅使得压缩机组的运行更加安全可靠，降低了压缩机的运行风险，而且简化了结构，降低了制造成本，缩短了制造周期；1. Compared with the prior art, the two-stage series-connected compressor circulating reflux control system of the present embodiment uses a set of three-way regulating valve to divide one backflow into two backflows, so that the two-way backflow can be well controlled, In this way, the inlet pressures of the two-stage compressors are balanced respectively, so that the inlet pressures of the two-stage compressors can be kept stable, which not only makes the operation of the compressor unit safer and more reliable, reduces the operation risk of the compressor, but also simplifies the structure and reduces the Manufacturing costs, shortening the manufacturing cycle;
2、现有技术中将两级串联的压缩机视为整体，而本发明采用了超驰控制，在通常情况下根据一级压缩机的入口压力对三通调节阀的开度进行调节，只有在一级压缩机的入口压力测量值大于等于预先设定的第一压力阈值且二级压缩机的入口压力测量值低于预先设定的第二压力阈值时，才切换到根据二级压缩机的入口压力给定值对三通调节阀的开度进行调节的方式，当二级压缩机的入口压力测量值大于等于预先设定的第二压力阈值时后，则恢复到根据一级压缩机的入口压力对三通调节阀的开度进行调节的方式。2. In the prior art, two-stage series-connected compressors are regarded as a whole, but the present invention adopts an overriding control, and under normal circumstances, the opening of the three-way regulating valve is adjusted according to the inlet pressure of the first-stage compressor, and only When the measured value of the inlet pressure of the first stage compressor is greater than or equal to the preset first pressure threshold value and the measured value of the inlet pressure of the second stage compressor is lower than the preset second pressure threshold value, switch to the second stage compressor according to The method of adjusting the opening of the three-way regulating valve by the given value of the inlet pressure, when the measured value of the inlet pressure of the secondary compressor is greater than or equal to the preset second pressure threshold, it will return to the first-stage compressor. The way in which the inlet pressure of the three-way regulating valve adjusts the opening degree.
附图说明Description of drawings
图1示出了根据本发明一实施例的两级串联压缩机循环回流控制系统的结构示意图。FIG. 1 shows a schematic structural diagram of a circulation return control system for two-stage series compressors according to an embodiment of the present invention.
图2示出了根据本发明两级串联压缩机循环回流控制系统的一实施例的控制器的控制示意图。FIG. 2 shows a schematic control diagram of a controller according to an embodiment of the circulation return control system for two-stage series compressors of the present invention.
图3示出了根据本发明两级串联压缩机循环回流控制系统的一实施例的控制器的逻辑控制框图。FIG. 3 shows a logic control block diagram of the controller according to an embodiment of the two-stage series compressor circulation return control system of the present invention.
具体实施方式Detailed ways
下面结合附图和具体实施例对本发明进行详细说明。The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
请参考图1和图2，根据本发明一实施例的一种两级串联压缩机循环回流控制系统，包括一级压缩机11和二级压缩机12、一级冷却器21和二级冷却器22、回流管路3、第一压力变送器41和第二压力变送器42、三通调节阀5和控制器6。Please refer to FIG. 1 and FIG. 2 , according to an embodiment of the present invention, a two-stage series compressor circulation control system includes a primary compressor 11 and a secondary compressor 12 , a primary cooler 21 and a secondary cooler 22 . The return line 3 , the first pressure transmitter 41 and the second pressure transmitter 42 , the three-way regulating valve 5 and the controller 6 .
在本实施例中，一级压缩机11和二级压缩机12均为螺杆压缩机，在其它的实施例中，一级压缩机11和二级压缩机12也可以是活塞式压缩机等其它类型的压缩机，本发明对此不做限制。In this embodiment, the primary compressor 11 and the secondary compressor 12 are both screw compressors. In other embodiments, the primary compressor 11 and the secondary compressor 12 may also be piston compressors and other other compressors. type of compressor, which is not limited in the present invention.
第一压力变送器41和第二压力变送器42分别设置于一级压缩机11和二级压缩机12的入口，用以分别检测两个压缩机的入口压力。三通调节阀5设置在回流管路3上，二级压缩机12的出口与三通调节阀5的入口连通，三通调节阀5的两个出口分别与两个压缩机的入口连通。The first pressure transmitter 41 and the second pressure transmitter 42 are respectively disposed at the inlets of the primary compressor 11 and the secondary compressor 12 to detect the inlet pressures of the two compressors respectively. The three-way regulating valve 5 is arranged on the return line 3, the outlet of the secondary compressor 12 is communicated with the inlet of the three-way regulating valve 5, and the two outlets of the three-way regulating valve 5 are respectively communicated with the inlets of the two compressors.
在本实施例中，三通调节阀5的常开出口连通于一级压缩机11的入口，三通调节阀5的常闭出口连通于二级压缩机12的入口。通过改变三通调节阀5的阀杆位置，可以调节从三通调节阀5的两个出口所排出的工艺气的分流量。一级冷却器21串联在一级压缩机11的出口与二级压缩机12的入口之间，二级冷却器22串联在二级压缩机21的出口与三通调节阀5的入口之间。一级压缩机11压缩工艺气后，工艺气进入一级冷却器21冷却，工艺气经过一级冷却器21冷却后，进入二级压缩机12，二级压缩机12压缩工艺气后，工艺气进入二级冷却器22冷却。In this embodiment, the normally open outlet of the three-way regulating valve 5 communicates with the inlet of the primary compressor 11 , and the normally closed outlet of the three-way regulating valve 5 communicates with the inlet of the secondary compressor 12 . By changing the position of the valve stem of the three-way regulating valve 5 , the partial flow of the process gas discharged from the two outlets of the three-way regulating valve 5 can be adjusted. The primary cooler 21 is connected in series between the outlet of the primary compressor 11 and the inlet of the secondary compressor 12 , and the secondary cooler 22 is connected in series between the outlet of the secondary compressor 21 and the inlet of the three-way regulating valve 5 . After the primary compressor 11 compresses the process gas, the process gas enters the primary cooler 21 for cooling, the process gas is cooled by the primary cooler 21, and then enters the secondary compressor 12. After the secondary compressor 12 compresses the process gas, the process gas Enter the secondary cooler 22 for cooling.
控制器6用于接收三通调节阀5反馈的阀门状态信号、以及第一压力变送器41和第二压力变送器42发送的检测结果，控制三通调节阀5的开度，以调节从二级压缩机12的出口回流到一级压缩机11和二级压缩机12的工艺气流量，使一级压缩机11的入口压力和二级压缩机12的入口压力维持稳定。The controller 6 is used to receive the valve status signal fed back by the three-way regulating valve 5 and the detection results sent by the first pressure transmitter 41 and the second pressure transmitter 42, and control the opening of the three-way regulating valve 5 to adjust the The flow of process gas returned from the outlet of the secondary compressor 12 to the primary compressor 11 and the secondary compressor 12 keeps the inlet pressure of the primary compressor 11 and the inlet pressure of the secondary compressor 12 stable.
本实施例中，控制器6用于优先根据一级压缩机11的入口压力给定值和入口压力测量值对三通调节阀5的开度进行控制，以使一级压缩机11的入口压力达到一级压缩机11的入口压力给定值，只有在一级压缩机的入口压力测量值大于等于预先设定的第一压力阈值且二级压缩机12的入口压力测量值低于预先设定的第二压力阈值时，根据二级压缩机12的入口压力给定值和入口压力测量值对三通调节阀的开度进行控制，以使二级压缩机12的入口压力达到二级压缩机12的入口压力给定值。第二压力阈值大于第一压力阈值。In this embodiment, the controller 6 is used to preferentially control the opening of the three-way regulating valve 5 according to the given value of the inlet pressure of the primary compressor 11 and the measured value of the inlet pressure, so that the inlet pressure of the primary compressor 11 Reach the given value of the inlet pressure of the first-stage compressor 11, only when the measured value of the inlet pressure of the first-stage compressor is greater than or equal to the preset first pressure threshold and the measured value of the inlet pressure of the second-stage compressor 12 is lower than the preset value When the second pressure threshold value of Inlet pressure setpoint of 12. The second pressure threshold is greater than the first pressure threshold.
进一步地，控制器6用于优先根据一级压缩机11的入口压力给定值与入口压力测量值的偏差对三通调节阀5的开度进行PID控制，以使一级压缩机11的入口压力达到一级压缩机11的入口压力给定值，只有在一级压缩机11的入口压力测量值大于等于预先设定的第一压力阈值且二级压缩机12的入口压力测量值低于预先设定的第二压力阈值时，根据二级压缩机12的入口压力给定值与入口压力测量值的偏差对三通调节阀5的开度进行PID控制，以使二级压缩机12的入口压力达到二级压缩机12的入口压力给定值。Further, the controller 6 is used to preferentially perform PID control on the opening of the three-way regulating valve 5 according to the deviation between the given value of the inlet pressure of the primary compressor 11 and the measured value of the inlet pressure, so that the inlet of the primary compressor 11 can be controlled by PID. The pressure reaches the given value of the inlet pressure of the first-stage compressor 11, only when the measured value of the inlet pressure of the first-stage compressor 11 is greater than or equal to the preset first pressure threshold and the measured value of the inlet pressure of the second-stage compressor 12 is lower than the preset value. When the second pressure threshold is set, PID control is performed on the opening of the three-way regulating valve 5 according to the deviation between the given value of the inlet pressure of the secondary compressor 12 and the measured value of the inlet pressure, so that the inlet of the secondary compressor 12 can be controlled by PID. The pressure reaches the inlet pressure setpoint of the secondary compressor 12 .
本实施例中，控制器6采用了超驰控制的方式。在通常情况下，控制器6根据一级压缩机11的入口压力给定值与入口压力测量值的偏差对三通调节阀5的开度进行PID控制，唯独只有在一级压缩机11的入口压力大于等于预先设定的第一压力阈值且二级压缩机12的入口压力测量值低于预先设定的第二压力阈值时，才切换到根据二级压缩机12的入口压力给定值与入口压力测量值的偏差对三通调节阀5的开度进行PID控制的方式，当二级压缩机12的入口压力测量值恢复到大于等于预先设定的第二压力阈值时后，则控制器6又切换到根据一级压缩机11的入口压力给定值与入口压力测量值的偏差对三通调节阀5的开度进行PID控制的方式。在一级压缩机11的入口压力测量值和二级压缩机12的入口压力测量值均低于各自预先设定的压力阈值时，控制器6也是根据一级压缩机11的入口压力给定值与入口压力测量值的偏差对三通调节阀5的开度进行PID控制，使一级压缩机11的入口压力达到一级压缩机11的入口压力给定值。之后，若二级压缩机12的入口压力仍然低于给定值的话，才对其进行调节。In this embodiment, the controller 6 adopts an overriding control method. Under normal circumstances, the controller 6 performs PID control on the opening of the three-way regulating valve 5 according to the deviation between the set value of the inlet pressure of the first-stage compressor 11 and the measured value of the inlet pressure. When the inlet pressure is greater than or equal to the preset first pressure threshold and the measured value of the inlet pressure of the secondary compressor 12 is lower than the preset second pressure threshold, the switch to the given value according to the inlet pressure of the secondary compressor 12 is performed. The deviation from the measured value of the inlet pressure is used to control the opening of the three-way regulating valve 5 by PID control. When the measured value of the inlet pressure of the secondary compressor 12 recovers to be greater than or equal to the preset second pressure threshold, the control The controller 6 switches to the mode of performing PID control on the opening degree of the three-way regulating valve 5 according to the deviation between the given value of the inlet pressure of the primary compressor 11 and the measured value of the inlet pressure. When the measured value of the inlet pressure of the primary compressor 11 and the measured value of the inlet pressure of the secondary compressor 12 are both lower than the respective preset pressure thresholds, the controller 6 is also based on the given value of the inlet pressure of the primary compressor 11 The deviation from the measured value of the inlet pressure carries out PID control on the opening of the three-way regulating valve 5 , so that the inlet pressure of the primary compressor 11 reaches a given value of the inlet pressure of the primary compressor 11 . Afterwards, it is only adjusted if the inlet pressure of the secondary compressor 12 is still below a given value.
之所以采用这样的控制方式，是因为两级串联的压缩机应视为一个整体，一级压缩机11的入口压力作为整体的入口压力尤为关键，而且当一级压缩机11的入口压力低时，如果回流量增加，其排气压力也会相应增加，所以二级压缩机12的入口压力也会随之增加，不过是有一定延迟罢了。所以才将一级压缩机11的入口压力控制模式设定为常规控制模式，而将二级压缩机12的入口压力控制模式设定为取代控制模式，并在两个压缩机的入口压力测量值均低于各自预先设定的压力阈值时，优先调节一级压缩机的入口压力，只有在一级压缩机入口压力正常且二级压缩机的入口压力低于预先设定的第二压力阈值时，才取代常规的控制模式，以使流入到二级压缩机12入口的回流更多一些，使二级压缩机12的入口压力恢复到大于等于预先设定的第二压力阈值，并且在二级压缩机12的入口压力恢复到大于等于预先设定的第二压力阈值后，依然切换到常规控制模式。在只有一级压缩机11的入口压力小于预先设定的第一压力阈值时，通过控制三通调节阀5，使流入一级压缩机11入口的回流更多一些。The reason why this control method is adopted is because the two-stage compressors in series should be regarded as a whole, and the inlet pressure of the first-stage compressor 11 as a whole is particularly critical, and when the inlet pressure of the first-stage compressor 11 is low, , if the return flow increases, the exhaust pressure will also increase accordingly, so the inlet pressure of the secondary compressor 12 will also increase, but there is a certain delay. Therefore, the inlet pressure control mode of the primary compressor 11 is set to the normal control mode, and the inlet pressure control mode of the secondary compressor 12 is set to the replacement control mode, and the measured values of the inlet pressures of the two compressors are When both are lower than their respective preset pressure thresholds, the inlet pressure of the primary compressor will be adjusted preferentially. Only when the inlet pressure of the primary compressor is normal and the inlet pressure of the secondary compressor is lower than the preset second pressure threshold , to replace the conventional control mode, so that the return flow into the inlet of the secondary compressor 12 is more, so that the inlet pressure of the secondary compressor 12 is restored to be greater than or equal to the preset second pressure threshold, and in the secondary compressor 12 After the inlet pressure of the compressor 12 is restored to be equal to or greater than the preset second pressure threshold, the normal control mode is still switched. When only the inlet pressure of the primary compressor 11 is lower than the preset first pressure threshold, the three-way regulating valve 5 is controlled to make more return flow into the inlet of the primary compressor 11 .
在本实施例中，控制器6为PLC控制器。图3示出了根据本发明两级串联压缩机循环回流控制系统的一实施例的控制器的逻辑控制框图。如图3所示，选择器默认根据一级压缩机11的入口压力给定值与入口压力测量值的偏差对三通调节阀5的开度进行PID控制，当一级压缩机11的入口压力正常且二级压缩机12的入口压力为L（即入口压力测量值低于预先设定的第二压力阈值）时，选择器接收到低电平，从而切换到根据二级压缩机12的入口压力给定值与入口压力测量值的偏差对三通调节阀5的开度进行PID控制的方式。In this embodiment, the controller 6 is a PLC controller. FIG. 3 shows a logic control block diagram of the controller according to an embodiment of the two-stage series compressor circulation return control system of the present invention. As shown in FIG. 3 , the selector performs PID control on the opening of the three-way regulating valve 5 according to the deviation between the given value of the inlet pressure of the first-stage compressor 11 and the measured value of the inlet pressure by default. When the inlet pressure of the first-stage compressor 11 is When normal and the inlet pressure of the secondary compressor 12 is L (ie, the measured value of the inlet pressure is lower than the preset second pressure threshold), the selector receives a low level, thereby switching to the inlet according to the secondary compressor 12 The deviation of the given pressure value and the measured value of the inlet pressure carries out PID control on the opening of the three-way regulating valve 5 .
以上描述是结合具体实施方式和附图对本发明所做的进一步说明。但是，本发明显然能够以多种不同于此描述的其它方法来实施，本领域技术人员可以在不违背本发明内容的情况下根据实际使用情况进行推广、演绎，因此，上述具体实施例的内容不应限制本发明确定的保护范围。The above description is a further description of the present invention in conjunction with the specific embodiments and the accompanying drawings. However, it is obvious that the present invention can be implemented in a variety of other methods different from those described herein, and those skilled in the art can generalize and deduce them according to actual use conditions without departing from the content of the present invention. Therefore, the content of the above-mentioned specific embodiments The scope of protection determined by the present invention should not be limited.
Claims (7)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910472241.9A CN110043467B (en) | 2019-05-31 | 2019-05-31 | Two-stage series compressor circulation and reflux control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910472241.9A CN110043467B (en) | 2019-05-31 | 2019-05-31 | Two-stage series compressor circulation and reflux control system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110043467A true CN110043467A (en) | 2019-07-23 |
| CN110043467B CN110043467B (en) | 2024-11-05 |
Family
ID=67284412
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910472241.9A Active CN110043467B (en) | 2019-05-31 | 2019-05-31 | Two-stage series compressor circulation and reflux control system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110043467B (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110538479A (en) * | 2019-10-12 | 2019-12-06 | 上海齐耀膨胀机有限公司 | Compression type heat pump rectification method for acetic acid concentration and system thereof |
| CN112762004A (en) * | 2021-02-25 | 2021-05-07 | 浙江宸轩透平机制造有限公司 | Anti-surge device of centrifugal compressor |
| CN114001803A (en) * | 2021-09-09 | 2022-02-01 | 浙江浙能天然气运行有限公司 | Bypass type natural gas flow automatic verification control system and control method thereof |
| CN115467830A (en) * | 2022-09-19 | 2022-12-13 | 上海齐耀螺杆机械有限公司 | Gas quantity adjusting device and method for two-stage screw compressor |
| CN115788830A (en) * | 2022-11-28 | 2023-03-14 | 中国船舶集团有限公司第七一一研究所 | Thermodynamic system of BOG compressor |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05170412A (en) * | 1991-12-19 | 1993-07-09 | Nippon Sanso Kk | Helium gas recovery method and device |
| CN103982408A (en) * | 2014-04-09 | 2014-08-13 | 上海好米工业技术有限公司 | Multistage compressor section-by-section pressure control device based on PLC (programmable logic controller) |
| 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 |
| CN210135084U (en) * | 2019-05-31 | 2020-03-10 | 上海齐耀螺杆机械有限公司 | Two-stage series compressor circulation reflux control system |
-
2019
- 2019-05-31 CN CN201910472241.9A patent/CN110043467B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05170412A (en) * | 1991-12-19 | 1993-07-09 | Nippon Sanso Kk | Helium gas recovery method and device |
| CN103982408A (en) * | 2014-04-09 | 2014-08-13 | 上海好米工业技术有限公司 | Multistage compressor section-by-section pressure control device based on PLC (programmable logic controller) |
| 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 |
| CN210135084U (en) * | 2019-05-31 | 2020-03-10 | 上海齐耀螺杆机械有限公司 | Two-stage series compressor circulation reflux control system |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110538479A (en) * | 2019-10-12 | 2019-12-06 | 上海齐耀膨胀机有限公司 | Compression type heat pump rectification method for acetic acid concentration and system thereof |
| CN112762004A (en) * | 2021-02-25 | 2021-05-07 | 浙江宸轩透平机制造有限公司 | Anti-surge device of centrifugal compressor |
| CN114001803A (en) * | 2021-09-09 | 2022-02-01 | 浙江浙能天然气运行有限公司 | Bypass type natural gas flow automatic verification control system and control method thereof |
| CN114001803B (en) * | 2021-09-09 | 2024-02-27 | 国家管网集团浙江省天然气管网有限公司 | Bypass type natural gas flow automatic verification control system and control method thereof |
| CN115467830A (en) * | 2022-09-19 | 2022-12-13 | 上海齐耀螺杆机械有限公司 | Gas quantity adjusting device and method for two-stage screw compressor |
| CN115788830A (en) * | 2022-11-28 | 2023-03-14 | 中国船舶集团有限公司第七一一研究所 | Thermodynamic system of BOG compressor |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110043467B (en) | 2024-11-05 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110043467A (en) | Two-stage series connection compressor cycle reflux control system | |
| CN104534713B (en) | Dual-compressor rapid cooling low temperature refrigeration system and method | |
| CN104501421B (en) | A kind of control method of frequency conversion two-stage compression heat pump water heater | |
| US20100272580A1 (en) | Slide valve with hot gas bypass port | |
| CN210135084U (en) | Two-stage series compressor circulation reflux control system | |
| CN111520875B (en) | A control method and system for one-drag multi-air conditioner | |
| CN111156651B (en) | Gulp valve control method, compressor, air conditioner, memory and controller | |
| CN106403427A (en) | Control method for electronic expansion valve in starting stage of refrigeration system | |
| US10948211B2 (en) | Water circulation system for air conditioning system and control method thereof | |
| CN116792305A (en) | Control system of air compression station | |
| US11906219B2 (en) | Flash tank-based control of refrigerant injection into a compressor | |
| KR20040013442A (en) | Multi-chamber type air conditioner and method for controlling electric expansion valve thereof | |
| CN206488498U (en) | A kind of handpiece Water Chilling Units | |
| CN110822751A (en) | Throttling and hot gas bypass coupled refrigerating capacity adjusting system and control method | |
| CN112196791B (en) | Energy-saving plug valve and screw compressor with energy-saving plug valve | |
| CN115164300A (en) | Method and device for oil return control of air conditioner, air conditioner, storage medium | |
| CN211146947U (en) | Fluid temperature control system based on cascade type closed loop PID adjustment | |
| CN204438583U (en) | A kind of two-shipper fast cooling cryogenic refrigerating system | |
| TWI795679B (en) | Screw compressor and volume adjustment method | |
| CN116447775A (en) | A method for controlling an electronic expansion valve of a low-temperature heat pump system | |
| CN117450623B (en) | Compressor frequency control method and air conditioning unit | |
| JPH0466796A (en) | Control method and device for compression equipment | |
| JPH02115585A (en) | Compressor capacity control device | |
| CN110296554B (en) | Shunting assembly, shunting control method thereof and multi-connected air conditioner | |
| CN214145797U (en) | Energy-conserving air compressor machine that fuel injection quantity intelligent control adjusted |
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 | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |