CN104950933B - Stabilizer for system steam pressure - Google Patents
Stabilizer for system steam pressure Download PDFInfo
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- CN104950933B CN104950933B CN201510285447.2A CN201510285447A CN104950933B CN 104950933 B CN104950933 B CN 104950933B CN 201510285447 A CN201510285447 A CN 201510285447A CN 104950933 B CN104950933 B CN 104950933B
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Abstract
The invention relates to a stabilizing device of system steam pressure, which comprises a compressor and a P L C controller and is characterized in that a first pressure sensor is arranged at the joint of an inlet of the compressor and a steam supply end of a steam pipeline, a second pressure sensor is arranged at the joint of an outlet of the compressor and a steam consumption end of the steam pipeline, the compressor is connected with an output end of a frequency converter for controlling the rotating speed of the compressor, a signal input end of the frequency converter is connected with an output end of the P L C controller, and a signal input end and an output end of the P L C controller are respectively connected with the first pressure sensor and the second pressure sensor.
Description
Technical Field
The invention belongs to the technical field of pressure control equipment, and particularly relates to a stabilizing device for system steam pressure.
Background
At present, for many small and medium-sized chemical enterprises, steam is often insufficient in steam supply along with the improvement of productivity, and the steam pressure fluctuation is large so as to influence the normal operation of production. Especially for chemical enterprises with both intermittent production and continuous production, the continuous production section needs stable steam pressure, and once the intermittent production section is started, the steam pressure of the system can be immediately reduced greatly, and once the intermittent production section is stopped, the steam pressure of the system is suddenly increased, thus being very unfavorable for the continuous production section. This does not lead to the continuous production section often needing to be adjusted and sudden steam pressure surges present safety hazards.
For the fluctuation of the steam pressure, at present, a boiler is mainly added to increase the steam supply amount, and then the steam pressure is stabilized by adjusting the opening degree of a valve. The increase of the boiler brings investment cost and operation cost, and the benefit of the boiler is reduced, but the effect of the boiler cannot be fully exerted; moreover, too small opening of the valve can cause overlarge steam pressure in the boiler, thereby reducing the heat transfer effect and bringing about potential safety hazard.
Disclosure of Invention
The invention provides a stabilizing device for system steam pressure, which is used for solving the technical problems of unstable steam pressure, intermittent steam supply and the like.
In order to solve the problems, the technical scheme is that the system steam pressure stabilizing device comprises a compressor and a P L C controller and is characterized in that a first pressure sensor is arranged at the joint of an inlet of the compressor and a steam supply end of a steam pipeline, a second pressure sensor is arranged at the joint of an outlet of the compressor and a steam consumption end of the steam pipeline, the compressor is connected with an output end of a frequency converter for controlling the rotating speed of the compressor, a signal input end of the frequency converter is connected with an output end of the P L C controller, and a signal input end of the P L C controller is respectively connected with the first pressure sensor and the second pressure sensor.
Preferably, the compressor is a high-speed centrifugal compressor, and the inlet and the outlet of the compressor are both provided with one-way valves.
The invention has the advantages of safe and reasonable structure, stable steam pressure and improved working efficiency. Compared with the prior art, the invention realizes the stability of the steam pressure of the system, avoids the negative influence on the production caused by the fluctuation of the steam pressure, stabilizes the steam pressure by using a pressurization method, and converts the work done by a compressor on the steam into the internal energy of the steam to be recycled; the low pressure at the inlet of the compressor is more beneficial to conveying steam from the boiler, simultaneously can reduce the steam pressure in the boiler and is more beneficial to vaporizing water in the boiler so as to generate more steam and finally play a role in improving the efficiency of the boiler.
Drawings
FIG. 1 is a schematic view of the apparatus of the present invention.
Detailed Description
The technical solution of the present invention is further described in detail with reference to the accompanying drawings and the detailed description.
As shown in the figure 1, the system steam pressure stabilizing device comprises a compressor 1, a frequency converter 4, a P L C controller 5, a first pressure sensor 2 and a second pressure sensor 3, wherein the first pressure sensor 2 is arranged at the joint of the inlet of the compressor 1 and a steam supply end 60 of a steam pipeline, the second pressure sensor 3 is arranged at the joint of the outlet of the compressor 1 and a steam consumption end 61 of the steam pipeline, the compressor 1 is connected with the output end of the frequency converter 4 for controlling the rotating speed of the compressor, the signal input end of the frequency converter 4 is connected with the output end of the P L C controller 5, the inlet and the outlet of the compressor 1 are both provided with a one-way valve 8 for preventing steam flow from flowing backwards, and the steam pipeline is set according to the following steps:
step one, installing a system steam pressure stabilizing device on a steam pipeline, and detecting the steam pressure in the steam pipeline by a first pressure sensor 2 and a second pressure sensor 3, and simultaneously ensuring the continuous supply of the steam;
step two, determining the steam pressure required by normal production, wherein the required steam pressure is the minimum steam pressure required by the normal operation of each steam consuming device;
step three, the outlet pressure of the compressor 1 is used as a controlled variable, the inlet pressure of the compressor 1 is used as a feedforward variable, the rotating speed of the compressor 1 is used as an operating variable, the outlet pressure value of the compressor 1 is set to be 0-0.02 Mpa higher than the required steam pressure value, the highest value of the rotating speed operating range of the compressor 1 is the highest rotating speed of compressor equipment, the signal input end of a P L C controller 5 is respectively connected with a first pressure sensor 2 and a second pressure sensor 3, the first pressure sensor 2 and the second pressure sensor 3 transmit the detected steam pressure to the P L C controller 5, and the P L C controller 5 can increase or decrease the frequency of a frequency converter 4 to adjust the compression capacity of the compressor 1 when the outlet pressure of the compressor 1 is lower than or higher than the required pressure;
and step four, setting a rotating speed operation range of the compressor 1, wherein the rotating speed operation range of the compressor 1 is set to be 100-40000 r/min, and the compressor 1 is a high-speed centrifugal compressor, so that the steam pressure is increased by 0-0.3 Mpa.
In the whole process, the steam pressure of the system fluctuates within 0.05Mpa, the pressure only needs to take 2-12 minutes from reduction to recovery, and the influence on the continuous working section is small.
When the steam pressure meets the requirement of production work, the compressor stops working, the steam flow does not need to be limited or pressurized, and the steam flow directly passes through the compressor.
Finally, it should be noted that the above embodiments are only representative examples of the present invention. It will be clear that the invention is not limited to the specific embodiments described above, but that many variations are possible. Any simple modification, equivalent change and modification made to the above embodiments in accordance with the technical spirit of the present invention should be considered to be within the scope of the present invention.
Claims (2)
1. A stabilizer for system steam pressure comprises a compressor and a P L C controller, and is characterized in that a first pressure sensor is arranged at the joint of an inlet of the compressor and a steam supply end of a steam pipeline, a second pressure sensor is arranged at the joint of an outlet of the compressor and a steam consumption end of the steam pipeline, the compressor is connected with an output end of a frequency converter for controlling the rotating speed of the compressor, a signal input end of the frequency converter is connected with an output end of the P L C controller, and a signal input end of the P L C controller is respectively connected with the first pressure sensor and the second pressure sensor, and the steam pipeline is set in the following steps:
step one, installing a system steam pressure stabilizing device on a steam pipeline, and detecting the steam pressure in the steam pipeline by a first pressure sensor and a second pressure sensor, and simultaneously ensuring the continuous supply of the steam;
step two, determining the steam pressure required by normal production, wherein the required steam pressure is the minimum steam pressure required by the normal operation of each steam consuming device;
step three, taking the outlet pressure of the compressor as a controlled variable, taking the inlet pressure of the compressor as a feedforward variable, taking the rotating speed of the compressor as an operating variable, setting the outlet pressure value of the compressor to be 0-0.02 Mpa higher than the required steam pressure value, setting the highest value of the rotating speed operating range of the compressor to be the highest rotating speed of compressor equipment, connecting the signal input ends of a P L C controller with a first pressure sensor and a second pressure sensor respectively, transmitting the detected steam pressure to a P L C controller by the first pressure sensor and the second pressure sensor, and increasing or reducing the frequency of a frequency converter to adjust the compression capacity of the compressor when the outlet pressure of the compressor is lower than or higher than the required pressure by the P L C controller;
and step four, setting the rotating speed operation range of the compressor, wherein the rotating speed operation range of the compressor is set to be 100-40000 r/min, the compressor is a high-speed centrifugal compressor, and the steam pressure is increased by 0-0.3 Mpa.
2. The system steam pressure stabilizer according to claim 1, wherein the compressor is a high speed centrifugal compressor, and the inlet and outlet of the compressor are provided with one-way valves.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510285447.2A CN104950933B (en) | 2015-05-29 | 2015-05-29 | Stabilizer for system steam pressure |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510285447.2A CN104950933B (en) | 2015-05-29 | 2015-05-29 | Stabilizer for system steam pressure |
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| CN104950933A CN104950933A (en) | 2015-09-30 |
| CN104950933B true CN104950933B (en) | 2020-07-14 |
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| CN105305929A (en) * | 2015-11-18 | 2016-02-03 | 苏州信利昌电子材料有限公司 | Variable-frequency speed regulation device |
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| JPH0565808A (en) * | 1991-09-04 | 1993-03-19 | Fuji Electric Co Ltd | Steam turbine plant supplying heat |
| US7201008B2 (en) * | 2003-05-05 | 2007-04-10 | Carrier Corporation | Vapor compression system performance enhancement and discharge temperature reduction in the unloaded mode of operation |
| US7127905B2 (en) * | 2003-12-19 | 2006-10-31 | Carrier Corporation | Vapor compression system startup method |
| SE526379C2 (en) * | 2004-01-22 | 2005-09-06 | Cargine Engineering Ab | Method and system for controlling a device for compression |
| JP4787199B2 (en) * | 2007-04-05 | 2011-10-05 | 株式会社神戸製鋼所 | Steam recovery equipment |
| WO2009029685A1 (en) * | 2007-08-27 | 2009-03-05 | H2Oil, Inc. | System and method for providing aqueous stream purification services |
| US9044693B2 (en) * | 2011-02-15 | 2015-06-02 | Purestream Services, Llc | Controlled-gradient, accelerated-vapor-recompression apparatus and method |
| SE534558C2 (en) * | 2010-02-12 | 2011-10-04 | Nordic Water Prod Ab | Methods and systems for supplying compressed air for operation of filters with variable bed |
| US20120073316A1 (en) * | 2010-09-23 | 2012-03-29 | Thermo King Corporation | Control of a transcritical vapor compression system |
| GB201021023D0 (en) * | 2010-12-10 | 2011-01-26 | Doosan Power Systems Ltd | Control system and method for oxyfuel boiler plant |
| JP5568517B2 (en) * | 2011-06-22 | 2014-08-06 | 株式会社神戸製鋼所 | Steam-driven compressor |
| CN202274285U (en) * | 2011-07-06 | 2012-06-13 | 中国寰球工程公司 | Pressure control system of liquefied natural gas storage tank |
| CN202199130U (en) * | 2011-08-12 | 2012-04-25 | 启东神农机械有限公司 | Mechanical recompression evaporator |
| CN202822807U (en) * | 2012-07-31 | 2013-03-27 | 广东正力精密机械有限公司 | Mechanical steam re-compressing system |
| CN203585805U (en) * | 2013-08-22 | 2014-05-07 | 天津华迈燃气装备股份有限公司 | Natural gas flashing vapour recovery device of liquefied natural gas (LNG) liquid adding station |
| CN203861927U (en) * | 2014-02-13 | 2014-10-08 | 滨州市力之源生物科技有限公司 | Mechanical recompression evaporator |
| CN203835683U (en) * | 2014-03-25 | 2014-09-17 | 重庆耐德能源装备集成有限公司 | Flash steam variable frequency compressor system and natural gas liquefaction system applied same |
| CN204731600U (en) * | 2015-05-29 | 2015-10-28 | 湖北绿色家园精细化工股份有限公司 | A kind of stabilising arrangement of System steam pressure |
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Address after: 60 No. 433000 Hubei province Xiantao Xiantao office Sha Tsui Road Applicant after: Hubei green home materials technology Limited by Share Ltd Address before: 60 No. 433000 Hubei province Xiantao Xiantao office Sha Tsui Road Applicant before: HUBEI GREENHOME FINE CHEMICAL CO., LTD. |
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