CN103926093B - Method for simulating additional component resistance through induced draft fan inlet baffle - Google Patents
Method for simulating additional component resistance through induced draft fan inlet baffle Download PDFInfo
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- CN103926093B CN103926093B CN201410103475.3A CN201410103475A CN103926093B CN 103926093 B CN103926093 B CN 103926093B CN 201410103475 A CN201410103475 A CN 201410103475A CN 103926093 B CN103926093 B CN 103926093B
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Abstract
The invention discloses a method for simulating additional component resistance through an induced draft fan inlet baffle. The method comprises the following steps that (1) a plurality of static pressure measurement points are distributed on the cross sections of a front straight pipe section and a rear straight pipe section of the induced draft fan inlet baffle respectively through the grid method; (2) the opening degree of the induced draft fan inlet baffle is gradually reduced, the reducing amplitude does not exceed 5% every minute, the wave range of negative pressure of a furnace of a coal-fired boiler is kept constant from -100 Pa to +100 Pa, and meanwhile the operating parameters of an induced draft fan are comprehensively monitored; (3) before the static pressure difference of the static pressure measurement points on the front straight pipe section and the rear straight pipe section of the induced draft fan inlet baffle exceeds the resistance of a component to be added, if some operating parameters are unqualified, the reduction of the opening degree of the induced draft fan inlet baffle is stopped, and it is determined that the overmeasure of the induced draft fan is not large enough to overcome the resistance of the component to be added, the induced draft fan needs to be replaced synchronously, or capacity expansion of the induced draft fan needs to be transformed; if the operating parameters are qualified, it is determined that overmeasure of the induced draft fan can overcome the resistance of the component to be added, and the induced draft fan does need to be transformed. By means of the method for simulating additional component resistance through the induced draft fan inlet baffle, whether the induced draft fan needs to be transformed or not after a flue gas system is transformed can be accurately judged.
Description
Technical field
The present invention relates to power equipment control field, particularly relate to coal unit and increase denitrification apparatus newly or after electric precipitation changes sack cleaner into, flue gas system resistance increases, the assessment technology field that the allowance of the air-introduced machine in flue gas system is enough.
Background technology
The new environmental protection standard " thermal power plant's air pollution emission standard " (GB 13223-2011) of country is promulgated, and the coal-fired nitrogen oxides of thermal power generation unit smoke stack emission, dust are required stricter by this standard.Coal-burning power plant needs increase the removing system (referred to as denitrating system) of nitrogen oxides in original flue gas system or transform the dust arrester in existing flue gas system.These two transformations to flue gas system all can cause flue gas system resistance to increase.
Owing to each power plant's situation is different, the air-introduced machine allowance of some power plant is bigger, although the resistance of the flue gas system after engineered increases, but its air-introduced machine still can maintain it properly functioning；Some power plant after transforming its flue gas system, then needs change its air-introduced machine in the lump or its air-introduced machine is carried out capacity-increasing transformation, could maintain the properly functioning of whole flue gas system.So power plant is faced with decision-making the need of the difficult problem transforming its air-introduced machine after its flue gas system is transformed in the lump.
Conventional determination methods is that the design parameter according to denitrating system or new dust arrester is estimated, but this method error is bigger, the present invention proposes a kind of method utilizing the newly-increased parts resistance of air-introduced machine inlet baffle simulation, can more precisely assess the allowance of its air-introduced machine after flue gas system is transformed enough.
Summary of the invention
It is an object of the invention to provide a kind of method utilizing the newly-increased parts resistance of air-introduced machine inlet baffle simulation, with help coal-burning power plant its flue gas system transform after, the allowance of the air-introduced machine assessing its flue gas system is enough, it may be judged whether need the air-introduced machine synchronizing to transform its flue gas system.
The goal of the invention of the present invention is achieved through the following technical solutions: a kind of method utilizing the newly-increased parts resistance of air-introduced machine inlet baffle simulation, comprises the steps:
1) on the cross section of the forward and backward straight length of air-introduced machine inlet baffle, it is respectively arranged several hydrostatic measuring points by gridding method；
It is 2 ~ 3 meters that described cross section leaves the recommended distance of described air-introduced machine inlet baffle.
The quantity of described hydrostatic measuring point is recommended as 4 ~ 6.
2) air-introduced machine inlet baffle is gradually turned down, reduction amplitude per minute is less than 5%, and it is constant at-100 ~+100Pa to maintain coal-burning boiler burner hearth suction wave to move scope, the operational factor of comprehensive monitoring air-introduced machine simultaneously, including: whether monitoring air-introduced machine electric current exceedes its rated current, whether air-introduced machine vibration exceedes the higher limit of its amplitude, and whether air-introduced machine bearing temperature exceedes its temperature upper limit, exceed i.e. be judged as defective；
3) before the differential static pressure of the hydrostatic measuring point on the forward and backward straight length of air-introduced machine inlet baffle exceedes the resistance of the newly-increased parts of plan, if there being operational factor defective, then stop turning down air-introduced machine inlet baffle, conclude that the allowance of air-introduced machine is not enough to overcome the resistance of the newly-increased parts of plan, need to synchronize change air-introduced machine or air-introduced machine is carried out capacity-increasing transformation；Otherwise, it was therefore concluded that: the allowance of air-introduced machine can overcome the resistance of the newly-increased parts of plan, it is not necessary to transformation air-introduced machine.
There is advantages that the allowance of the method assessment air-introduced machine using the present invention is enough, judge after flue gas system is transformed simple the need of synchronizing transformation air-introduced machine operating process, accuracy is high, is conducive to saving the expense of power plant's technological transformation, increases economic efficiency.
Detailed description of the invention
Coal burning boiler of power station structure is complicated, and the flue gas of generation just can enter chimney after wanting the step such as removing dust, desulfurization, so flue gas resistance is relatively big, needs to utilize air-introduced machine to be extracted out by flue gas, and air-introduced machine also results in the negative pressure required for the burner hearth of coal-burning boiler simultaneously.Air-introduced machine inlet baffle is arranged on the air inlet of air-introduced machine, for isolation and the maintenance of air-introduced machine, also referred to as turns off baffle plate, and the air-introduced machine inlet baffle of indication of the present invention i.e. refers to this shutoff baffle plate.It is stator blade controllable register that air-introduced machine entrance the most also has another baffle plate, for changing exerting oneself of air-introduced machine.
It is desirable to provide a kind of method utilizing the newly-increased parts resistance of air-introduced machine inlet baffle simulation, it comprises the steps:
1) air-introduced machine inlet baffle forward and backward straight length distance air-introduced machine inlet baffle 2 ~ 3 meters at cross section on be respectively arranged 4 ~ 6 hydrostatic measuring points by gridding method.The distance that two cross sections leave air-introduced machine inlet baffle is of substantially equal.Arranging hydrostatic measuring point at chosen distance air-introduced machine inlet baffle 2 ~ 3 meters, be conducive to making the static pressure recorded more accurate, hydrostatic measuring point is distributed by gridding method, is conducive to the static pressure meansigma methods making the data recorded can react this cross section more accurately.
2) air-introduced machine inlet baffle is gradually turned down, reduction amplitude per minute is less than 5%, and it is constant at-100 ~+100Pa to maintain coal-burning boiler burner hearth suction wave to move scope, the operational factor of comprehensive monitoring air-introduced machine simultaneously, it is primarily referred to as: whether monitoring air-introduced machine electric current exceedes its rated current, whether air-introduced machine vibration exceedes the higher limit 125 microns of its amplitude, different manufacturers is slightly different, whether air-introduced machine bearing temperature exceedes its temperature upper limit 75 DEG C, this numerical value of different manufacturers also can slightly difference, exceed i.e. be judged as defective.Maintain coal-burning boiler burner hearth suction wave to move scope and have some untight positions at the constant boiler that is because of-100 ~+100Pa, outwards jet out flames if pressure crosses conference, and pressure the lowest if can affect economy and safety.The adjustment of combustion chamber draft can be described above by regulation
The rotating speed of the open degree of stator blade controllable register or the motor shaft of air-introduced machine realizes.
3) before the differential static pressure of the hydrostatic measuring point on the forward and backward straight length of air-introduced machine inlet baffle exceedes the resistance of the newly-increased parts of plan, if there being operational factor defective, then stop turning down air-introduced machine inlet baffle, conclude that the allowance of air-introduced machine is not enough to overcome the resistance of the newly-increased parts of plan, need to synchronize change air-introduced machine or air-introduced machine is carried out capacity-increasing transformation；Otherwise, it was therefore concluded that: the allowance of air-introduced machine can overcome the resistance of the newly-increased parts of plan, it is not necessary to transformation air-introduced machine.Described differential static pressure is the difference of the meansigma methods of the static pressure of the hydrostatic measuring point on forward and backward straight length.The application is to use tosimeter to measure the static pressure of hydrostatic measuring point.The resistance of newly-increased parts can be calculated by existing method.
Claims (3)
1. the method utilizing the newly-increased parts resistance of air-introduced machine inlet baffle simulation, it is characterised in that comprise the steps:
1) on the cross section of the forward and backward straight length of air-introduced machine inlet baffle, it is respectively arranged several hydrostatic measuring points by gridding method；
2) air-introduced machine inlet baffle is gradually turned down, reduction amplitude per minute is less than 5%, and it is constant at-100 ~+100Pa to maintain coal-burning boiler burner hearth suction wave to move scope, the operational factor of comprehensive monitoring air-introduced machine simultaneously, including: whether monitoring air-introduced machine electric current exceedes its rated current, whether air-introduced machine vibration exceedes the higher limit of its amplitude, and whether air-introduced machine bearing temperature exceedes its temperature upper limit, exceed i.e. be judged as defective；
3) before the differential static pressure of the hydrostatic measuring point on the forward and backward straight length of air-introduced machine inlet baffle exceedes the resistance of the newly-increased parts of plan, if there being operational factor defective, then stop turning down air-introduced machine inlet baffle, conclude that the allowance of air-introduced machine is not enough to overcome the resistance of the newly-increased parts of plan, need to synchronize change air-introduced machine or air-introduced machine is carried out capacity-increasing transformation；Otherwise, it was therefore concluded that: the allowance of air-introduced machine can overcome the resistance of the newly-increased parts of plan, it is not necessary to transformation air-introduced machine.
The method utilizing the newly-increased parts resistance of air-introduced machine inlet baffle simulation the most according to claim 1, it is characterised in that it is 2 ~ 3 meters that described cross section leaves the distance of described air-introduced machine inlet baffle.
The method utilizing the newly-increased parts resistance of air-introduced machine inlet baffle simulation the most according to claim 1, it is characterised in that the quantity of described hydrostatic measuring point is 4 ~ 6.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410103475.3A CN103926093B (en) | 2014-03-20 | 2014-03-20 | Method for simulating additional component resistance through induced draft fan inlet baffle |
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| CN201410103475.3A CN103926093B (en) | 2014-03-20 | 2014-03-20 | Method for simulating additional component resistance through induced draft fan inlet baffle |
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| CN103926093A CN103926093A (en) | 2014-07-16 |
| CN103926093B true CN103926093B (en) | 2017-01-11 |
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| CN111111940B (en) * | 2020-02-13 | 2024-04-30 | 天津水泥工业设计研究院有限公司 | Transformation method for reducing resistance of preheater and preheating system |
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| JPH0693956A (en) * | 1992-09-16 | 1994-04-05 | Haruji Kurogo | Method for saving energy generated through utilization of rotation of force draft fan for boiler |
| JPH07286723A (en) * | 1994-04-15 | 1995-10-31 | Nippon Steel Corp | Controlling method for induced draught fan |
| CN102798537A (en) * | 2012-07-30 | 2012-11-28 | 中国能源建设集团广东省电力设计研究院 | Simulative testing device for rain-zone resistance of reverse-flow natural ventilation wet-type cooling tower |
| CN203101082U (en) * | 2013-02-28 | 2013-07-31 | 谢卓祥 | Range hood smoke discharging performance laboratory structure with resistance air outlet |
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Address after: 510080 water Donggang 8, Dongfeng East Road, Yuexiu District, Guangzhou, Guangdong. Patentee after: ELECTRIC POWER RESEARCH INSTITUTE, GUANGDONG POWER GRID CO., LTD. Address before: 510080 water Donggang 8, Dongfeng East Road, Yuexiu District, Guangzhou, Guangdong. Patentee before: Electrical Power Research Institute of Guangdong Power Grid Corporation |
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