CN102840182B - Thermal power plant's axial-flow blower low-load vibration isolation method and bypass air channel control loop - Google Patents
Thermal power plant's axial-flow blower low-load vibration isolation method and bypass air channel control loop Download PDFInfo
- Publication number
- CN102840182B CN102840182B CN201210333240.4A CN201210333240A CN102840182B CN 102840182 B CN102840182 B CN 102840182B CN 201210333240 A CN201210333240 A CN 201210333240A CN 102840182 B CN102840182 B CN 102840182B
- Authority
- CN
- China
- Prior art keywords
- flow
- axial
- air channel
- bypass air
- blower fan
- 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.)
- Active
Links
Landscapes
- Control Of Positive-Displacement Air Blowers (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The present invention relates to thermal power plant's axial-flow blower low-load vibration isolation method and bypass air channel control loop, the feature of this vibration isolation method is to comprise the steps: 1) bypass air channel control loop is set in thermal power plant's axial-flow blower, for regulating the recirculating mass of blower fan; 2) using the output flow under a certain operating mode of blower fan as primary signal, recirculating mass minimum needed for this operating mode is calculated through function operator, the recirculating mass under this operating mode is controlled, under making blower fan be operated in the boundary conditions of stable operation by bypass air channel control loop; 3) using the output flow under each operating mode as primary signal, recirculating mass minimum needed for each operating mode is calculated through function operator, the recirculating mass under each operating mode is controlled by bypass air channel control loop, under making blower fan be operated in the boundary conditions of stable operation under various operating mode, ensure blower fan not stall with less recirculating mass, and reduce the power consumpiton of recirculation.The present invention has with the not stall of less recirculating mass guarantee blower fan, the beneficial effect obviously reducing the power consumpiton of recirculation.
Description
Technical field
The present invention relates to air channel control loop, especially a kind of thermal power plant axial-flow blower low-load vibration isolation method and bypass air channel control loop.Belong to thermal power plant's control technique field of electric power system.
Background technique
In thermal power plant's power generating equipment, axial-flow blower needs to run at low load, but axial-flow blower easily produces fluctuation of service, easily stall occurs when underrun.In prior art, normally adopt at the scene and increase fan outlet to the bypass air channel of fans entrance, section port air quantity is recycled to fans entrance, thus improves fans entrance air quantity, blower fan can be run under stall line, reach the object of stable operation.
But the way of the air quantity of this raising fans entrance, the consequence caused always has part wind at blower fan Inner eycle, thus reduce fan efficiency.Therefore, if air circulation can not be controlled well, although blower fan can stable operation, fan efficiency decline more, power consumption is larger.
Such as: prior art has people to adopt to arrange a bypass at fan outlet to fans entrance, a shutoff door is installed in described bypass air channel, this judgement door is operated, without regulatory function (see Fig. 4) by switch controlling signal, there is following shortcoming: after (1) measures fan stall, just open the shutoff door on bypass air channel, blower fan there occurs irregular operation, just takes measures, and affects fan life.(2) uncontrollable bypass air quantity.(3) fan operation power consumption is large.
Summary of the invention
An object of the present invention, be in order to overcome existing technology can not controlled circulation air quantity, affect the shortcoming in fan efficiency and life-span, a kind of thermal power plant axial-flow blower low-load vibration isolation method is provided.
Object two of the present invention is the bypass air channel control loops in order to provide the axial-flow blower low-load vibrationproof of a kind of thermal power plant.
An object of the present invention can reach by the following technical programs:
Thermal power plant's axial-flow blower low-load vibration isolation method, is characterized in that comprising the steps:
1) bypass air channel control loop is set in thermal power plant's axial-flow blower, for regulating the recirculating mass of blower fan;
2) using the output flow under a certain operating mode of blower fan as primary signal, recirculating mass minimum needed for this operating mode is calculated through function operator, the recirculating mass under this operating mode is controlled, under making blower fan be operated in the boundary conditions of stable operation by bypass air channel control loop;
3) by that analogy, using the output flow under each operating mode as primary signal, recirculating mass minimum needed for each operating mode is calculated through function operator, the recirculating mass under each operating mode is controlled by bypass air channel control loop, under making blower fan be operated in the boundary conditions of stable operation under various operating mode, ensure blower fan not stall with less recirculating mass, and reduce the power consumpiton of recirculation.
An object of the present invention can also reach by taking following technological scheme:
Further, the defining method of the boundary conditions of described blower fan stable operation is: according to the performance curve of blower fan,
First the stall line of blower fan is found out, then according to representation
in, known allowance k, stall blast pk, stall flow qk, operating pressure p, calculate the minimum safe operating flux of several typical condition, according to the gas density of correspondence, according to the ratio pressure energy calculated and minimum safe operating flux, i.e. stall proof stall minimum discharge, obtain the different minimum stream value run than the fan safe under pressure energy, be then linked to be curve, this curve forms stable operation curve, i.e. the boundary conditions of blower fan stable operation.
Further, stable operation curve is the function curve than pressure energy and stall proof minimum discharge, and the function of this curve represents with representation Y=f (Q),
Wherein, Y-than pressure energy, Nm/kg;
Q-flow, m
3/ s.
Further, utilize the different minimum stream value more corresponding than pressure energy, on method of least squares basis, fit to the analytic expression of above-mentioned function, described function analytic expression is multiple known function, comprises multinomial, hyperbola, exponential function.
Further, aforementioned functions analytic expression is conventional multinomial, i.e. Y=a
0+ a
1q+a
2q
2, wherein, Q is flow, and all the other are constant.
Two of object of the present invention can reach by taking following technological scheme:
The bypass air channel control loop of thermal power plant's axial-flow blower low-load vibrationproof, comprise axial-flow blower and be arranged on the bypass air channel between axial-flow blower exhaust outlet and intake grill, its structural feature is: on bypass air channel, be provided with control loop, described control loop is made up of adjustable valve and controller, adjustable valve is arranged on bypass air channel, the control signal output terminal of the control input end connection control device of adjustable valve, controller carrys out the recirculating mass of Control Shaft flow fan, under making axial-flow blower be operated in the boundary conditions of stable operation by the open degree controlling adjustable valve.
Two of object of the present invention can also reach by taking following technological scheme:
Further, described controller comprises detection unit and process and control unit, the exhaust outlet of the test end coupling shaft flow fan of detection unit, the output terminal connection handling of detection unit and the input end of control unit, the output terminal of process and control unit connects the control input end of adjustable valve; The fitting function of expressing axial-flow blower stable operation curve is built-in with in process and control unit, the air output sent here according to detection unit of process and control unit compares with the minimum recirculating mass (wind flow) calculated needed for axial-flow blower that described fitting function draws, and the open degree of control adjustable valve carrys out the recirculating mass of Control Shaft flow fan.
Further, detection unit is the flowmeter surveying wind, and process and control unit are made up of single board computer or computer for controlling.
Further, bypass air channel is also provided with Shuttoff Valve.
The present invention has following outstanding beneficial effect:
1, the present invention is due to using the output flow under each operating mode as primary signal, recirculating mass minimum needed for each operating mode is calculated through function operator, the recirculating mass under each operating mode is controlled by bypass air channel control loop, under making blower fan be operated in the boundary conditions of stable operation under various operating mode, therefore, have with the not stall of less recirculating mass guarantee blower fan, the beneficial effect obviously reducing the power consumpiton of recirculation.
2, the present invention forms control loop owing to being provided with on the bypass air channel of axial-flow blower by adjustable valve and controller, controller carrys out the recirculating mass of Control Shaft flow fan by the open degree controlling adjustable valve, under making axial-flow blower be operated in the boundary conditions of stable operation, on purpose to regulate on bypass air channel adjustment doors aperture with the stable operation of Control Shaft flow fan under minimum reduced air flow, therefore, have and can make axial-flow blower safe operation, axial flow can be reduced with the beneficial effect of blower fan electric energy loss again.
3, the present invention expresses the fitting function of axial-flow blower stable operation curve owing to being built-in with in the process and control unit of control loop, minimum recirculating mass (wind flow) needed for the axial-flow blower that the air output sent here according to detection unit of process and control unit and the described fitting function of calculating draw compares, the open degree controlling adjustable valve carrys out the recirculating mass of Control Shaft flow fan, therefore, accurately can control the open degree of adjustable valve, the i.e. required minimum recirculating mass (wind flow) of accurate Control Shaft flow fan stable operation, there is the beneficial effect of accurate Control Shaft flow fan energy consumption.
4, the present invention is by establishing an adjustable gate on recirculation conduit, and using blower fan output flow as primary signal, recirculating mass minimum needed for the function operator accurate Calculation, recirculating mass under each operating mode of accurate control, blower fan not stall is ensured with less recirculating mass, and reduce the power consumpiton of recirculation, reach the energy-conservation object improving fan total efficiency.
Accompanying drawing explanation
Fig. 1 is a kind of structural representation that the present invention relates to control loop.
Fig. 2 is a kind of performance chart of Silence Process axial-flow blower.
Fig. 3 is the stable operation plotted curve based on least square fitting.
Fig. 4 is a kind of structural representation of prior art.
Embodiment
Specific embodiment 1:
With reference to Fig. 1, the bypass air channel control loop of thermal power plant's axial-flow blower low-load vibrationproof that the present embodiment relates to, comprise axial-flow blower 1 and be arranged on the bypass air channel 2 between axial-flow blower 1 exhaust outlet and intake grill, bypass air channel 2 is provided with control loop, described control loop is made up of adjustable valve 4 and controller 5, adjustable valve 4 is arranged on bypass air channel 2, the control signal output terminal of the control input end connection control device 5 of adjustable valve 4, controller 5 carrys out the recirculating mass of Control Shaft flow fan by the open degree controlling adjustable valve 4, under making axial-flow blower be operated in the boundary conditions of stable operation.
In the present embodiment:
Described controller 5 comprises detection unit and process and control unit, the exhaust outlet of the test end coupling shaft flow fan of detection unit, the output terminal connection handling of detection unit and the input end of control unit, the output terminal of process and control unit connects the control input end of adjustable valve 4; The fitting function of expressing axial-flow blower stable operation curve is built-in with in process and control unit, the air output sent here according to detection unit of process and control unit compares with the minimum recirculating mass (wind flow) calculated needed for axial-flow blower that described fitting function draws, and the open degree of control adjustable valve 4 carrys out the recirculating mass of Control Shaft flow fan.Detection unit is the flowmeter surveying wind, and process and control unit are made up of single board computer or computer for controlling.Bypass air channel 2 is also provided with Shuttoff Valve 3
Thermal power plant's axial-flow blower low-load vibration isolation method is described in detail below in conjunction with accompanying drawing 1,2:
Thermal power plant of the present invention axial-flow blower low-load vibration isolation method, comprises the steps:
1) bypass air channel control loop is set in thermal power plant's axial-flow blower, for regulating the recirculating mass of blower fan;
2) using the output flow under a certain operating mode of blower fan as primary signal, recirculating mass minimum needed for this operating mode is calculated through function operator, the recirculating mass under this operating mode is controlled, under making blower fan be operated in the boundary conditions of stable operation by bypass air channel control loop;
3) by that analogy, using the output flow under each operating mode as primary signal, recirculating mass minimum needed for each operating mode is calculated through function operator, the recirculating mass under each operating mode is controlled by bypass air channel control loop, under making blower fan be operated in the boundary conditions of stable operation under various operating mode, ensure blower fan not stall with less recirculating mass, and reduce the power consumpiton of recirculation.
1, the boundary conditions about axial-flow blower stable operation is explained
Axial fan is under some delivery pressures given by piping resistance, if air inflow is lower, the angle of attack of blade inlet air-flow and blade becomes greatly, exceedes critical value and produces the phenomenon that air-flow is separated with blade surface later, be called " stall ".The macroscopic appearance of fan stall is that blower fan output pressure head reduces suddenly, and blast big ups and downs, cause strong vibration and huge noise, and long-time running can cause blower fan structure to destroy.In order to ensure fan safe, during normal running, blower fan all should be greater than the operation of stall critical flow.Because there is the stall critical value that corresponding under each setting pressure, these critical values are linked to be curve, this curve is exactly the boundary line of blower fan stable operation.
According to DL/T438-2004 " For Air Fans of Utility Boilers type selecting and use directive/guide ":
Axial fan should have enough stall margins, stall margin can represent with stall safety system k, k is obtained by representation (2) by the air quantity of the stall operating point (or pressure maximum point) of (movable vane is adjusted to movable vane angle, and stator blade is adjusted to and regulates stator angle) under operating point for design and this aperture, blast.When Selection and Design, k > 1.3 should be chosen.Representation is as follows:
In formula:
The blast of p, q---operating point for design and air quantity;
Pk, qk---the blast of stall operating point and air quantity.
Fig. 2 is certain model Silence Process axial-flow blower performance curve, and being drawn by blower fan producer provides.
With reference to Fig. 2, as follows to parameter interpretation on characteristic curve of fan:
Abscissa: the flow representing blower fan, symbol: Q, unit: m3/s
Y coordinate: the ratio pressure energy representing blower fan, the i.e. ratio of pressure head and density: P/ ρ.Symbol: Y, unit: Nm/kg, represents that blower fan is to the acting amount of unit mass air-flow, is equivalent to the static pressure liter that unit mass gas obtains after blower fan.
Resistance curve: " Liu Liang – resistance " function of exterior pipe system, has the piping Resistance Value that corresponding under each given flow.
Theoretical stall line: theoretical stall line is exactly the curve that stall operating mode is formed by connecting.
Pressure when fan operation and flow on the left of theoretical stall line (it is critical that flow is less than stall), will there is stall in blower fan, cannot stable operation, and when fan operation (it is critical that flow is greater than stall) on the right side of theoretical stall line, blower fan can stable operation.
In prior art, general stall proof measure, that recirculation conduit is set in blower fan, make to be greater than output flow by the flow of fan blade, because recirculation conduit does not have regulating power, in order to take into account each operating mode, therefore recirculating mass is larger, consume more power of fan, blower fan overall efficiency declines.
2, about drafting and the representation of stable operation curve
Illustrate:
The defining method of the boundary conditions of described blower fan stable operation is: according to the performance curve of blower fan, first finds out the stall line of blower fan, then according to representation
in, known allowance k, stall blast pk, stall flow qk, operating pressure p, calculate the minimum safe operating flux of several typical condition, according to the gas density of correspondence, according to the ratio pressure energy calculated and minimum safe operating flux, i.e. stall proof minimum discharge, obtain the different minimum stream value run than the fan safe under pressure energy, be then linked to be curve, this curve forms stable operation curve, i.e. the boundary conditions of blower fan stable operation.
Stable operation curve is the function curve than pressure energy and stall proof minimum discharge, and the function of this curve represents with representation Y=f (Q),
Wherein, Y-than pressure energy, Nm/kg;
Q-flow, m
3s.
Utilize the different minimum stream value more corresponding than pressure energy, on method of least squares basis, fit to the analytic expression of above-mentioned function, described function analytic expression is multiple known function, comprises multinomial, hyperbola, exponential function.
Aforementioned functions analytic expression is conventional multinomial, i.e. Y=a
0+ a
1q+a
2q
2, wherein, Q is flow, and all the other are constant.
According to the data of the difference in certain Silence Process axial-flow blower characteristic curve in Fig. 2 than pressure energy and minimum discharge point, as shown in table 1:
Table 1: than pressure energy and the data list of stall proof minimum discharge
On least square basis, matching than the function expression of pressure energy and stall proof minimum discharge,
Y=-532.95-0.48446Q+0.017079Q
2
Be drawn in same coordinate by the stable operation curve of matching and matching data point, in matched curve and table 1, data are coincide very well as shown in Figure 3.
The fitting function representation expressing stable operation curve is loaded in the controller 5 of control loop, for controlling the aperture of adjustable valve 4.
In the present embodiment, system layout function operator, can computing contrast the action parameter of Operational Limits as bypass adjustment doors on single board computer or computer for controlling, the action command send when Operational Limits enters hazardous area and open Shuttoff Valve 3 instruction, opened bypass adjustable valve 4, send by control loop the aperture that instruction control loop adjusts adjustable valve 4 according to after functional operation, fan outlet to the air circulation of import is allowed to be the minimum value of blower fan stable operation, i.e. economic air quantity, make blower fan can stable operation, again can economical operation.
The above; be only the specific embodiment of the best of the present invention; but protection scope of the present invention is not limited thereto; anyly be familiar with those skilled in the art in the scope that the present invention discloses; be equal to according to technological scheme of the present invention and inventive concept thereof and replace or change, all belonged to protection scope of the present invention.
Claims (9)
1. thermal power plant's axial-flow blower low-load vibration isolation method, is characterized in that comprising the steps:
1) bypass air channel control loop is set in thermal power plant's axial-flow blower, for regulating the recirculating mass of blower fan;
2) using the output flow under a certain operating mode of blower fan as primary signal, recirculating mass minimum needed for this operating mode is calculated through function operator, the recirculating mass under this operating mode is controlled, under making blower fan be operated in the boundary conditions of stable operation by bypass air channel control loop;
3) by that analogy, using the output flow under each operating mode as primary signal, recirculating mass minimum needed for each operating mode is calculated through function operator, the recirculating mass under each operating mode is controlled by bypass air channel control loop, under making blower fan be operated in the boundary conditions of stable operation under various operating mode, ensure blower fan not stall with less recirculating mass, and reduce the power consumpiton of recirculation.
2. thermal power plant according to claim 1 axial-flow blower low-load vibration isolation method, is characterized in that: the defining method of the boundary conditions of described blower fan stable operation is: according to the performance curve of blower fan, first finds out the stall line of blower fan, then according to representation
in, known allowance k, stall blast pk, stall flow qk, operating pressure p, calculate the minimum safe operating flux of several typical condition, according to the gas density of correspondence, according to the ratio pressure energy calculated and minimum safe operating flux, i.e. stall proof minimum discharge, obtain the different minimum stream value run than the fan safe under pressure energy, be then linked to be curve, this curve forms stable operation curve, i.e. the boundary conditions of blower fan stable operation.
3. thermal power plant according to claim 2 axial-flow blower low-load vibration isolation method, is characterized in that: stable operation curve is the function curve than pressure energy and stall proof minimum discharge, and the function of this curve represents with representation Y=f (Q),
Wherein, Y-than pressure energy, Nm/kg;
Q-flow, m
3/ s.
4. the thermal power plant's axial-flow blower low-load vibration isolation method according to Claims 2 or 3, it is characterized in that: utilize the different minimum stream value more corresponding than pressure energy, on method of least squares basis, fit to the analytic expression of above-mentioned function, described function analytic expression is multiple known function, comprises multinomial, hyperbola, exponential function.
5. thermal power plant according to claim 4 axial-flow blower low-load vibration isolation method, is characterized in that: aforementioned functions analytic expression is conventional multinomial, i.e. Y=a
0+ a
1q+a
2q
2, wherein, Q is flow, and all the other are constant.
6. the bypass air channel control loop of thermal power plant according to claim 1 axial-flow blower low-load vibration isolation method, comprise axial-flow blower (1) and be arranged on the bypass air channel (2) of axial-flow blower (1) between exhaust outlet and intake grill, it is characterized in that: on bypass air channel (2), be provided with control loop, described control loop is made up of adjustable valve (4) and controller (5), adjustable valve (4) is arranged on bypass air channel (2), the control signal output terminal of control input end connection control device (5) of adjustable valve (4), controller (5) carrys out the recirculating mass of Control Shaft flow fan by the open degree controlling adjustable valve (4), under making axial-flow blower be operated in the boundary conditions of stable operation.
7. bypass air channel according to claim 6 control loop, it is characterized in that: described controller (5) comprises detection unit and process and control unit, the exhaust outlet of the test end coupling shaft flow fan of detection unit, the output terminal connection handling of detection unit and the input end of control unit, the output terminal of process and control unit connects the control input end of adjustable valve (4); The fitting function of expressing axial-flow blower stable operation curve is built-in with in process and control unit, the air output sent here according to detection unit of process and control unit compares with the minimum recirculating mass calculated needed for axial-flow blower that gained fitting function draws, and the open degree of control adjustable valve (4) carrys out the recirculating mass of Control Shaft flow fan.
8. bypass air channel according to claim 7 control loop, is characterized in that: detection unit is the flowmeter surveying wind, and process and control unit are made up of single board computer or computer for controlling.
9. bypass air channel according to claim 6 control loop, is characterized in that: on bypass air channel (2), be also provided with Shuttoff Valve (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210333240.4A CN102840182B (en) | 2012-09-10 | 2012-09-10 | Thermal power plant's axial-flow blower low-load vibration isolation method and bypass air channel control loop |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210333240.4A CN102840182B (en) | 2012-09-10 | 2012-09-10 | Thermal power plant's axial-flow blower low-load vibration isolation method and bypass air channel control loop |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102840182A CN102840182A (en) | 2012-12-26 |
| CN102840182B true CN102840182B (en) | 2016-03-09 |
Family
ID=47367837
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210333240.4A Active CN102840182B (en) | 2012-09-10 | 2012-09-10 | Thermal power plant's axial-flow blower low-load vibration isolation method and bypass air channel control loop |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102840182B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106643919B (en) * | 2016-08-24 | 2020-06-30 | 福建龙净环保股份有限公司 | Flue gas flow measuring method and measuring device |
| JP6964484B2 (en) * | 2017-10-30 | 2021-11-10 | 川崎重工業株式会社 | Engine system |
| CN110186067B (en) * | 2019-05-08 | 2024-06-04 | 国网浙江省电力有限公司电力科学研究院 | Smoke air duct coupling system for preventing fan from stalling |
| CN111946651B (en) * | 2020-08-12 | 2022-04-12 | 中国大唐集团科学技术研究院有限公司华东电力试验研究院 | Fan stall early warning method and system |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102007301A (en) * | 2008-04-14 | 2011-04-06 | 江森自控科技公司 | Control system |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006029200A (en) * | 2004-07-15 | 2006-02-02 | Toshiba Corp | Centrifugal pump and operation method for the same |
| FI125258B (en) * | 2010-07-19 | 2015-08-14 | Runtech Systems Oy | Method of controlling a vacuum centrifugal fan with adjustable rotational speed |
-
2012
- 2012-09-10 CN CN201210333240.4A patent/CN102840182B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102007301A (en) * | 2008-04-14 | 2011-04-06 | 江森自控科技公司 | Control system |
Non-Patent Citations (2)
| Title |
|---|
| 轴流式一次风机失速分析及应对策略;杨守伟等;《河北电力技术》;20120425;第31卷(第2期);第46-48页 * |
| 轴流式引风机失速原因分析及预防措施;张乐军，付永华;《浙江电力》;20091020(第5期);全文 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102840182A (en) | 2012-12-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106050722B (en) | Complete performance surge controlling method and system based on the principle of similitude | |
| CN105370629B (en) | PTA device energy recovery control methods | |
| CN206360877U (en) | A kind of optimal control for energy saving system of variable frequency pump parallel running | |
| CN105543443B (en) | A method of being used for coal gas of converter pressuring machine antisurge control system | |
| CN102840182B (en) | Thermal power plant's axial-flow blower low-load vibration isolation method and bypass air channel control loop | |
| CN102953745B (en) | High-efficiency energy-saving mine multi-stage fan station ventilation monitoring technology system | |
| CN105604973B (en) | A kind of axial flow compressor all fronts anti-surge control method | |
| CN103452824B (en) | Based on the energy saving in fans and pumps system of the minimum power algorithm of flow-power curve | |
| CN100476172C (en) | Compressor control unit and gas turbine power plant including the same | |
| CN101782260A (en) | Optimal control method and device for water system of air conditioning | |
| CN103307668B (en) | New wind box and fresh air introducing apparatus | |
| CN112751061B (en) | Fuel cell air circuit testing system and method | |
| CN106870465A (en) | A kind of compressor, gas turbine and compressor stability-enhancement synergistic method | |
| CN104989661A (en) | Anti-surge energy-saving control device of single-stage high-speed centrifugal air blower | |
| CN103742445A (en) | Nuclear main pump maximum flow hydraulic design method | |
| CN202732432U (en) | Bypass air flue control loop used for preventing vibration of low load of thermal power plant axial flow fan | |
| CN107917094A (en) | A kind of blast furnace blower anti-surge control method | |
| CN103225621A (en) | Method for detecting surge of compressor | |
| CN110500184B (en) | Waste heat utilization system for improving gas turbine combined cycle economy | |
| CN109236693B (en) | Control method of air blast system of front oxygen-enriched blast furnace | |
| Chun et al. | A Study on surge and stall under the interaction of parallel axial flow fan in tunnel | |
| CN202001840U (en) | High-efficiency fluid conveying system | |
| CN112096447B (en) | Coal mine gas extraction system pipeline negative pressure control system and 'prediction + increment PID' negative pressure control method thereof | |
| CN113417741A (en) | Improved gas-steam combined cycle unit and control method thereof | |
| CN106438467A (en) | Centrifugal fan and variable work condition adjustment method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C53 | Correction of patent for invention or patent application | ||
| CB02 | Change of applicant information |
Address after: 510670 Luogang District, Guangdong, Guangzhou Science City Fung Road, No. 1, No. Applicant after: Company limited of China Energy Engineering Group Guangdong Electric Power Design Institute Address before: 510670 Luogang District, Guangdong, Guangzhou Science City Fung Road, No. 1, No. Applicant before: Guangdong Electric Power Design Institute of CEEC |
|
| COR | Change of bibliographic data |
Free format text: CORRECT: APPLICANT; FROM: CHINA ENERGY ENGINEERING GROUP GUANGDONG ELECTRIC POWER DESIGN INSTITUTE TO: CHINA ENERGY ENGINEERING GROUP GUANGDONG ELECTRIC POWER DESIGN INSTITUTE CO., LTD. |
|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |