CN202732432U - Bypass air flue control loop used for preventing vibration of low load of thermal power plant axial flow fan - Google Patents
Bypass air flue control loop used for preventing vibration of low load of thermal power plant axial flow fan Download PDFInfo
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- CN202732432U CN202732432U CN 201220459596 CN201220459596U CN202732432U CN 202732432 U CN202732432 U CN 202732432U CN 201220459596 CN201220459596 CN 201220459596 CN 201220459596 U CN201220459596 U CN 201220459596U CN 202732432 U CN202732432 U CN 202732432U
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Abstract
The utility model relates to a bypass air flue control loop used for preventing vibration of low load of a thermal power plant axial flow fan. The thermal power plant axial flow fan comprises an axial flow fan (1) and a bypass air flue (2) arranged between the air outlet and air inlet of the axial flow fan (1), and is characterized in that the bypass air flue (2) is provided with a control loop, and the control loop is composed of an adjustable valve (4) and a controller (5); the adjustable valve (4) is arranged on the bypass air flue (2), and the control input end of the adjustable valve (4) is connected with the control signal output end of the controller (5); and the controller (5) controls the recirculating flow of the axial flow fan through controlling the opening degree of the adjustable valve (4), and the axial flow fan can operate the boundary condition of the stable operation. According to the utility model, the bypass air flue of the axial flow fan is provided with a control loop composed of the adjustable valve and the controller, and the control loop purposively adjusts the opening degree of an adjustable door on the bypass air flue so as to control the axial flow fan to stably operate under the minimal recirculation air flow; and therefore, the axial flow fan has the beneficial effects of carrying out safe operation, and reducing the electric energy loss of the axial flow fan.
Description
Technical field
The utility model relates to the air channel control loop, especially a kind of bypass air channel control loop for thermal power plant's axial-flow blower low-load vibrationproof.The thermal power plant control technique field that belongs to electric power system.
Background technique
In thermal power plant's power generating equipment, axial-flow blower need to move under low-load, but axial-flow blower easily produces fluctuation of service, easily surge occurs when underrun.In the prior art, normally adopting at the scene increases fan outlet to the bypass air channel of fans entrance, the section port air quantity is recycled to fans entrance, thereby improves the fans entrance air quantity, and blower fan can be moved under surge line, reaches the purpose of stable operation.
But the way of the air quantity of this raising fans entrance, the consequence that causes are always to have part wind to circulate in blower fan, thereby reduce fan efficiency.Therefore, if can not control air circulation well, although blower fan can stable operation, that fan efficiency descends is more, power consumption is larger.
For example: prior art has the people to adopt at fan outlet to fans entrance one bypass is set, a shutoff door is installed in described bypass air channel, by switch controlling signal operate this decision gate, without regulatory function (referring to Fig. 4), there is following shortcoming: after (1) measures fan stall, just open the shutoff door on the bypass air channel, irregular operation has occured in blower fan, just takes measures, and affects fan life.(2) uncontrollable bypass air quantity.(3) the fan operation power consumption is large.
The model utility content
The purpose of this utility model, being can not the controlled circulation air quantity in order to overcome existing technology, affect the shortcoming in fan efficiency and life-span, and a kind of bypass air channel control loop for thermal power plant's axial-flow blower low-load vibrationproof is provided.
The purpose of this utility model can reach by taking following technological scheme:
The bypass air channel control loop that is used for thermal power plant's axial-flow blower low-load vibrationproof, comprise axial-flow blower and be arranged on bypass air channel between axial-flow blower exhaust outlet and the intake grill, its structural feature is: be provided with control loop in the bypass air channel, described control loop is made of adjustable valve and controller, adjustable valve is arranged on the bypass air channel, the control input end of adjustable valve connects the control signal output terminal of controller, controller comes the recirculating mass of Control Shaft flow fan by the open degree of control control adjustable valve, axial-flow blower is operated under the boundary conditions of stable operation.
The purpose of this utility model can also reach by taking following technological scheme:
Further, described controller comprises detection unit and processing and control unit, the exhaust outlet of the test end coupling shaft flow fan of detection unit, the output terminal of detection unit connects the input end of processing and control unit, and the output terminal of processing and control unit connects the control input end of adjustable valve; In processing and control unit, be built-in with the fitting function of expressing axial-flow blower stable operation curve, process and minimum recirculating mass (wind flow) that air output that control unit is sent here according to detection unit is required with calculating axial-flow blower that described fitting function draws relatively, the open degree of control adjustable valve is come the recirculating mass of Control Shaft flow fan.
Further, detection unit is for surveying the flowmeter of wind, and processing and control unit are made of single board computer or control computer.
Further, on the bypass air channel, also be provided with Shuttoff Valve.
The utlity model has following outstanding beneficial effect:
1, the utility model consists of control loop owing to being provided with by adjustable valve and controller in the bypass air channel of axial-flow blower, controller comes the recirculating mass of Control Shaft flow fan by the open degree of control control adjustable valve, axial-flow blower is operated under the boundary conditions of stable operation, on purpose regulate the bypass air channel raise the section door aperture with the stable operation of Control Shaft flow fan under minimum reduced air flow, therefore, have and to make the axial-flow blower safe operation, can reduce axial flow with the beneficial effect of blower fan electric energy loss again.
2, the utility model is owing to being built-in with the fitting function of expressing axial-flow blower stable operation curve in the processing of control loop and control unit, process and minimum recirculating mass (wind flow) that air output that control unit is sent here according to detection unit is required with calculating axial-flow blower that described fitting function draws relatively, the open degree of control adjustable valve is come the recirculating mass of Control Shaft flow fan, therefore, can accurately control the open degree of adjustable valve, be the required minimum recirculating mass (wind flow) of accurate Control Shaft flow fan stable operation, the beneficial effect with accurate Control Shaft flow fan energy consumption.
3, the utility model is by establishing an adjustable gate on recirculation conduit, and with the blower fan output flow as primary signal, recirculating mass through the required minimum of functional operation device accurate Calculation, accurately control the recirculating mass under each operating mode, guarantee not stall of blower fan with less recirculating mass, and reduce the power consumpiton of recirculation, reach the energy-conservation purpose that improves fan total efficiency.
Description of drawings
Fig. 1 is a kind of structural representation that the utility model relates to control loop.
Fig. 2 is a kind of performance chart of stator blade adjustable shaft flow fan.
Fig. 3 is based on the stable operation plotted curve of least square fitting.
Fig. 4 is a kind of structural representation of prior art.
Embodiment
Specific embodiment 1:
With reference to Fig. 1, the present embodiment comprises axial-flow blower 1 and is arranged on bypass air channel 2 between axial-flow blower 1 exhaust outlet and the intake grill, be provided with control loop in bypass air channel 2, described control loop is made of adjustable valve 4 and controller 5, adjustable valve 4 is arranged on the bypass air channel 2, the control input end of adjustable valve 4 connects the control signal output terminal of controller 5, controller 5 comes the recirculating mass of Control Shaft flow fan by the open degree of control control adjustable valve 4, axial-flow blower is operated under the boundary conditions of stable operation.
In the present embodiment:
Described controller 5 comprises detection unit and processing and control unit, the exhaust outlet of the test end coupling shaft flow fan of detection unit, the output terminal of detection unit connects the input end of processing and control unit, and the output terminal of processing and control unit connects the control input end of adjustable valve 4; In processing and control unit, be built-in with the fitting function of expressing axial-flow blower stable operation curve, process and minimum recirculating mass (wind flow) that air output that control unit is sent here according to detection unit is required with calculating axial-flow blower that described fitting function draws relatively, the open degree of control adjustable valve 4 is come the recirculating mass of Control Shaft flow fan.Detection unit is for surveying the flowmeter of wind, and processing and control unit are made of single board computer or control computer.On bypass air channel 2, also be provided with Shuttoff Valve 3
Describe thermal power plant's axial-flow blower low-load vibration isolation method in detail below in conjunction with accompanying drawing 1,2,3:
1, explains about the boundary conditions of axial-flow blower stable operation
Axial fan is under some delivery pressures given by the piping resistance, if air inflow is lower, it is large that the angle of attack of blade inlet air-flow and blade becomes, and surpasses critical value and produce later on the phenomenon that air-flow separates with blade surface, is called " stall ".The macroscopic appearance of fan stall is that blower fan output pressure head reduces suddenly, and the blast big ups and downs cause strong vibration and huge noise, and the long-time running meeting causes blower fan structure to destroy.In order to guarantee blower fan safety, blower fan all should move greater than the stall critical flow during normal running.Because the stall critical value of a correspondence is arranged 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 guide rule ":
Axial fan should have enough stall margins, stall margin can represent with stall safety system k, k is obtained by representation (2) by air quantity, the blast of the stall operating point (or pressure maximum point) of (movable vane is adjusted to the movable vane angle, and stator blade is adjusted to regulates the stator angle) under operating point for design and this aperture.When Selection and Design, should choose k＞1.3.Representation is as follows:
In the formula:
The blast of p, q---operating point for design and air quantity;
Blast and the air quantity of pk, qk---stall operating point.
Fig. 2 is certain model stator blade adjustable shaft flow fan performance curve, and being drawn by blower fan producer provides.
With reference to Fig. 2, as follows to parameter interpretation on the characteristic curve of fan:
Abscissa: the flow of expression blower fan, symbol: Q, unit: m3/s
Y coordinate: the ratio pressure energy of expression blower fan, the i.e. ratio of pressure head and density: P/ ρ.Symbol: Y, unit: Nm/kg, expression blower fan are equivalent to the static pressure liter of unit mass gas through obtaining behind the blower fan to the acting amount of unit mass air-flow.
The drag characteristic curve: " flow-resistance " function of exterior pipe system has the piping Resistance Value of a correspondence under each given flow.
Theoretical stall line: theoretical stall line is exactly the curve that the stall operating mode is formed by connecting.
Pressure when fan operation and flow are in theoretical stall line left side (flow is critical less than stall), and stall will occur blower fan, can't stable operation, when fan operation on theoretical stall line right side (flow is critical greater than stall), blower fan can stable operation.
In the prior art, general stall proof measure, that recirculation conduit is set in blower fan, make flow by fan blade greater than output flow, because recirculation conduit does not have regulating power, in order to take into account each operating mode, so recirculating mass is larger, consume more power of fan, the blower fan overall efficiency descends.
2, about drafting and the representation of stable operation curve
Illustrate:
Definite method of the boundary conditions of described blower fan stable operation is: according to the performance curve of blower fan, at first find 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, gas density according to correspondence, according to the ratio pressure energy and the minimum safe operating flux that calculate, be stall proof stall minimum discharge, obtain different minimum stream values than the blower fan safe operation under the pressure energy, then be linked to be curve, this curve consists of stable operation curve, the i.e. boundary conditions of blower fan stable operation.
The stable operation curve is the function curve than pressure energy and stall proof stall minimum discharge, representation Y=f (Q) expression of the function of this curve,
Wherein, Y-is than pressure energy, Nm/kg;
The Q-flow, m
3/ s.
Utilize the different minimum stream values more corresponding than pressure energy, on the method for 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.
The aforementioned functions analytic expression is conventional multinomial, i.e. Y=a
0+ a
1Q+a
2Q
2, wherein, Q is flow, all the other are constant.
According to the data of the difference in certain stator blade adjustable shaft flow fan characteristic curve among 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 stall minimum discharge
On the least square basis, match is than the function expression of pressure energy and stall proof stall minimum discharge,
Y=-532.95-0.48446Q+0.017079Q
2
Stable operation curve and the match of match are drawn in the same coordinate with data point, and data are coincide fine in matched curve and the table 1 as shown in Figure 3.
The fitting function representation of expressing the stable operation curve is loaded in the controller 5 of control loop, is used for the aperture of control adjustable valve 4.
In the present embodiment, system layout functional operation device, can computing and contrast Operational Limits as the action parameter of bypass adjustment doors on single board computer or control computer, the action command of when Operational Limits enters the hazardous area, sending and open Shuttoff Valve 3 instructions, opening bypass adjustable valve 4, according to sending the aperture that the instruction control loop is adjusted adjustable valve 4 by control loop after the functional operation, allow fan outlet to the air circulation of import be to be the minimum value of blower fan stable operation, it is economic air quantity, make the blower fan can stable operation, again can economical operation.
The above; it only is the specific embodiment of the utility model the best; but protection domain of the present utility model is not limited to this; anyly be familiar with those skilled in the art in the scope that the utility model discloses; be equal to replacement or change according to the technical solution of the utility model and model utility design thereof, all belonged to protection domain of the present utility model.
Claims (4)
1. the bypass air channel control loop that is used for thermal power plant's axial-flow blower low-load vibrationproof, comprise axial-flow blower (1) and be arranged on bypass air channel (2) between axial-flow blower (1) exhaust outlet and the intake grill, it is characterized in that: be provided with control loop in bypass air channel (2), described control loop is made of adjustable valve (4) and controller (5), adjustable valve (4) is arranged on the bypass air channel (2), the control input end of adjustable valve (4) connects the control signal output terminal of controller (5), controller (5) comes the recirculating mass of Control Shaft flow fan by the open degree of control control adjustable valve (4), axial-flow blower is operated under the boundary conditions of stable operation.
2. the bypass air channel control loop for thermal power plant's axial-flow blower low-load vibrationproof according to claim 1, it is characterized in that: described controller (5) comprises detection unit and processing and control unit, the exhaust outlet of the test end coupling shaft flow fan of detection unit, the output terminal of detection unit connects the input end of processing and control unit, and the output terminal of processing and control unit connects the control input end of adjustable valve (4); In processing and control unit, be built-in with the fitting function of expressing axial-flow blower stable operation curve, process and minimum recirculating mass that air output that control unit is sent here according to detection unit is required with calculating axial-flow blower that described fitting function draws relatively, the open degree of control adjustable valve (4) is come the recirculating mass of Control Shaft flow fan.
3. the bypass air channel control loop for thermal power plant's axial-flow blower low-load vibrationproof according to claim 2 is characterized in that: detection unit is for surveying the flowmeter of wind, processes and control unit is made of single board computer or control computer.
4. the bypass air channel control loop for thermal power plant's axial-flow blower low-load vibrationproof according to claim 1 is characterized in that: also be provided with Shuttoff Valve (3) on bypass air channel (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220459596 CN202732432U (en) | 2012-09-10 | 2012-09-10 | Bypass air flue control loop used for preventing vibration of low load of thermal power plant axial flow fan |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220459596 CN202732432U (en) | 2012-09-10 | 2012-09-10 | Bypass air flue control loop used for preventing vibration of low load of thermal power plant axial flow fan |
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| CN202732432U true CN202732432U (en) | 2013-02-13 |
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| CN 201220459596 Expired - Fee Related CN202732432U (en) | 2012-09-10 | 2012-09-10 | Bypass air flue control loop used for preventing vibration of low load of thermal power plant axial flow fan |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107352274A (en) * | 2017-08-25 | 2017-11-17 | 天津商业大学 | A kind of regulatable new induction Pneumatic conveyer of particle concentration |
| CN114987727A (en) * | 2022-06-16 | 2022-09-02 | 中国船舶重工集团公司第七一九研究所 | Self-powered disturbance suppression device for pump valve pipe network of ship power system |
-
2012
- 2012-09-10 CN CN 201220459596 patent/CN202732432U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107352274A (en) * | 2017-08-25 | 2017-11-17 | 天津商业大学 | A kind of regulatable new induction Pneumatic conveyer of particle concentration |
| CN114987727A (en) * | 2022-06-16 | 2022-09-02 | 中国船舶重工集团公司第七一九研究所 | Self-powered disturbance suppression device for pump valve pipe network of ship power system |
| CN114987727B (en) * | 2022-06-16 | 2024-02-23 | 中国船舶重工集团公司第七一九研究所 | Self-powered disturbance suppression device for pump valve pipe network of ship power system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: CHINA ENERGY ENGINEERING GROUP GUANGDONG ELECTRIC Free format text: FORMER NAME: CHINA ENERGY ENGINEERING GROUP GUANGDONG ELECTRIC POWER DESIGN INSTITUTE |
|
| CP01 | Change in the name or title of a patent holder |
Address after: 510670 Luogang District, Guangdong, Guangzhou Science City Fung Road, No. 1, No. Patentee 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. Patentee before: Guangdong Electric Power Design Institute of CEEC |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130213 Termination date: 20160910 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |