CN106678031A - Method for determining maintenance interval of ultra-supercritical unit boiler feed pump - Google Patents
Method for determining maintenance interval of ultra-supercritical unit boiler feed pump Download PDFInfo
- Publication number
- CN106678031A CN106678031A CN201610538211.XA CN201610538211A CN106678031A CN 106678031 A CN106678031 A CN 106678031A CN 201610538211 A CN201610538211 A CN 201610538211A CN 106678031 A CN106678031 A CN 106678031A
- Authority
- CN
- China
- Prior art keywords
- feed water
- water pump
- pump
- ultra
- parameters
- 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
- 238000012423 maintenance Methods 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 title claims abstract description 33
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 171
- 230000003068 static effect Effects 0.000 claims abstract description 8
- 230000008859 change Effects 0.000 claims description 14
- 230000005484 gravity Effects 0.000 claims description 6
- 230000008878 coupling Effects 0.000 claims description 5
- 238000010168 coupling process Methods 0.000 claims description 5
- 238000005859 coupling reaction Methods 0.000 claims description 5
- 238000006073 displacement reaction Methods 0.000 claims description 3
- 230000008439 repair process Effects 0.000 claims description 2
- 238000004364 calculation method Methods 0.000 description 17
- 239000000463 material Substances 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 238000009530 blood pressure measurement Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000003745 diagnosis Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 230000010349 pulsation Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B51/00—Testing machines, pumps, or pumping installations
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D17/00—Regulating or controlling by varying flow
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
- Control Of Positive-Displacement Pumps (AREA)
Abstract
本发明公开了确定超超临界机组锅炉给水泵维修维护间隔的方法，包括以下步骤：获取超超临界机组锅炉给水泵实时运行时的稳定性参数及经济性参数；将获得的实时运行时的稳定性参数及经济性参数与原始的稳定性参数及经济性参数分别进行比较，获取经济性参数变化量及稳定性参数变化量；经济性参数变化量及稳定性参数变化量用于表示超超临界机组锅炉给水泵内部动静部件之间的磨损失效状态，继而确定超超临界机组锅炉给水泵的维修间隔。本发明确定大修时间的方法，弥补了原来定时计划检修对经济性影响考虑的不足，尤其使用于现代型高速、高压锅炉给水泵。
The invention discloses a method for determining the maintenance interval of a boiler feed water pump of an ultra-supercritical unit, comprising the following steps: obtaining the stability parameters and economical parameters of the boiler feed pump of the ultra-supercritical unit during real-time operation; The economical parameters and economical parameters are compared with the original stability parameters and economical parameters respectively to obtain the variation of economical parameters and the variation of stability parameters; the variation of economical parameters and the variation of stability parameters are used to represent the ultra-supercritical The wear failure state between the dynamic and static parts of the boiler feed pump of the unit, and then determine the maintenance interval of the boiler feed pump of the ultra-supercritical unit. The method for determining the overhaul time of the present invention makes up for the lack of consideration of the economical impact of the original scheduled overhaul, and is especially suitable for modern high-speed, high-pressure boiler feed water pumps.
Description
技术领域technical field
本发明涉及给水泵维修技术领域，具体涉及确定超超临界机组锅炉给水泵维修维护间隔的方法。The invention relates to the technical field of feed water pump maintenance, in particular to a method for determining the maintenance interval of an ultra-supercritical unit boiler feed water pump.
背景技术Background technique
锅炉给水泵是电站的主要耗能辅机之一，随主机蒸汽参数的提高而增加。根据消耗功率的大小、运行参数的高低以及其总体结构，给水泵可简单地划分为两大类--传统型高、中压锅炉给水泵和现代超超临界型高速、高压锅炉给水泵。The boiler feed water pump is one of the main energy-consuming auxiliary machines of the power station, which increases with the increase of the steam parameters of the main engine. According to the size of power consumption, the level of operating parameters and its overall structure, feed water pumps can be simply divided into two categories - traditional high and medium pressure boiler feed water pumps and modern ultra-supercritical high speed and high pressure boiler feed water pumps.
传统型的运转速度一般在3000r/min以下，通常为单壳体、分段式，并用穿杠螺栓整体联接，而现代超超临界型一般运转在4600r/min以上，为双壳体、泵蕊抽心式整体结构。过去传统型锅炉给水泵由于级数较多，制造工艺、部件材质差等方面的原因，其大修间隔通常随主汽轮机一同采取定时计划检修的方式，这种方式也主要是从保证机组安全运行的角度来考虑，而对设备及其大修带来的经济性影响没有充分重视。The operating speed of the traditional type is generally below 3000r/min, and it is usually a single casing and segmented type, and is integrally connected by through-bar bolts, while the modern ultra-supercritical type generally operates above 4600r/min, and is a double casing, pump core Heart-pumping overall structure. In the past, due to the large number of stages, poor manufacturing process, and poor component materials, the overhaul interval of traditional boiler feed pumps was usually scheduled along with the main steam turbine. This method is also mainly to ensure the safe operation of the unit. Considering from the angle of view, but not enough attention to the economic impact of equipment and its overhaul.
对现代超超临界型锅炉给水泵，转速的提高，使其结构更加紧凑，同时由于制造工艺、部件材质的大幅提高，使其安全运行的寿命大大延长，特别对于那些在内部易损、易冲、易磨部位采取了特殊材质和特殊工艺的现代超超临界型高速、高压锅炉给水泵，通常连续运行多年，才能观察到其性能的微小变化，如果仍沿用过去定时计划检修的方式，则会盲目地增加给水泵的大修次数，带来不必要的经济消耗，显然已不适应于现代超超临界型锅炉给水泵的经济安全运行的要求。同时，现代超超临界型锅炉给水泵采用泵蕊抽心式的结构，电厂只要备用一台泵心，一旦给水泵故障，可快速复装而恢复正常工作。被换下的泵心，可在充足时间内进行检修后继续作为备用。For modern ultra-supercritical boiler feed water pumps, the increase in speed makes the structure more compact. At the same time, due to the substantial improvement in manufacturing technology and component materials, the life of safe operation is greatly extended, especially for those pumps that are easily damaged and flushed inside. 1. Modern ultra-supercritical high-speed, high-pressure boiler feed pumps with special materials and special processes used in the easy-to-wear parts usually operate continuously for many years before observing slight changes in their performance. Blindly increasing the number of overhauls of feed water pumps will bring unnecessary economic consumption, which is obviously not suitable for the economical and safe operation of modern ultra-supercritical boiler feed water pumps. At the same time, the modern ultra-supercritical boiler feed water pump adopts the core pumping structure. The power plant only needs to have one spare pump core. Once the feed water pump fails, it can be quickly reinstalled and resume normal operation. The replaced pump core can continue to be used as a spare after overhauling in sufficient time.
综上所述，需要变更定时计划大修的方式，探索、寻求一种确定现代超超临界型高速高压锅炉给水泵最佳大修时间的方法，这样既能保证设备高可靠、高经济地运转，又可尽量降低大修带来的各种费用。To sum up, it is necessary to change the method of scheduled overhaul, and to explore and seek a method to determine the best overhaul time of modern ultra-supercritical high-speed and high-pressure boiler feed pumps, so as to ensure the high reliability and economical operation of the equipment, and Various expenses brought about by overhaul can be reduced as much as possible.
发明内容Contents of the invention
为解决现有技术存在的不足，本发明公开了确定超超临界机组锅炉给水泵最优维修维护间隔的方法，本发明的方法既能保证设备高可靠、高经济地运转，又可尽量降低大修带来的各种费用。In order to solve the deficiencies in the prior art, the present invention discloses a method for determining the optimal maintenance interval of the boiler feed water pump of an ultra-supercritical unit. The method of the present invention can not only ensure highly reliable and economical operation of the equipment, but also minimize overhaul various costs incurred.
为实现上述目的，本发明的具体方案如下：To achieve the above object, the specific scheme of the present invention is as follows:
确定超超临界机组锅炉给水泵维修维护间隔的方法，包括以下步骤：The method for determining the repair and maintenance interval of the boiler feed water pump of the ultra-supercritical unit includes the following steps:
获取超超临界机组锅炉给水泵实时运行时的稳定性参数及经济性参数；Obtain the stability parameters and economical parameters of the ultra-supercritical unit boiler feed pump in real-time operation;
将获得的实时运行时的稳定性参数及经济性参数与原始的稳定性参数及经济性参数分别进行比较，获取经济性参数变化量及稳定性参数变化量；Comparing the obtained stability parameters and economic parameters during real-time operation with the original stability parameters and economic parameters respectively, to obtain the variation of economic parameters and the variation of stability parameters;
经济性参数变化量及稳定性参数变化量用于表示超超临界机组锅炉给水泵内部动静部件之间的磨损失效状态，继而确定超超临界机组锅炉给水泵的维修间隔。The variation of economic parameters and the variation of stability parameters are used to represent the wear failure state between the dynamic and static parts of the ultra-supercritical unit boiler feed water pump, and then determine the maintenance interval of the ultra-supercritical unit boiler feed water pump.
需要说明的是，经济性参数变化量及稳定性参数变化量越大泵的运行状况越差，当至少其中之一的经济性参数变化量或稳定性参数变化量达到一定数值时，超超临界机组锅炉给水泵就处于失效用状态了。It should be noted that the greater the change in economical parameters and the greater the change in stability parameters, the worse the operation of the pump. When at least one of the changes in economic parameters or stability parameters reaches a certain value, the ultra-supercritical The boiler feed water pump of the unit is in a state of failure.
进一步的，在确定维修间隔时，当稳定性参数变化量或给水泵实时运行数值超过允许值时，则超超临界机组锅炉给水泵进行维修。Further, when the maintenance interval is determined, when the variation of the stability parameter or the real-time operation value of the feed water pump exceeds the allowable value, the boiler feed water pump of the ultra-supercritical unit is maintained.
当稳定性数据达到一定条件，尽管经济性数据尚好，也要进行维修。比如一些意外的剧烈的机械故障，需要有早于最佳检修时间的设备停止，应用程序中经济稳定性数值的比较计算，也有助于这些意外剧烈机械故障的早期快速诊断，为合理的确定维护方案预先提供筹划信息。实时运行数值就是运行着的设备显示的一些数据。When the stability data reaches a certain condition, even if the economic data is still good, maintenance should be carried out. For example, some unexpected severe mechanical failures require equipment to be stopped earlier than the optimal maintenance time. The comparative calculation of the economic stability value in the application program is also helpful for the early and rapid diagnosis of these unexpected severe mechanical failures, and it is reasonable to determine maintenance The program provides planning information in advance. The real-time running value is some data displayed by the running equipment.
进一步的，在确定维修间隔时，将经济性参数变化量及稳定性参数变化量折算成单位时间内耗费，将给水泵大修依次所消耗各项费用之和与给水泵大修对主机经济性影响的折算的费用相迭加，将耗费值与迭加值做差值后计算给水泵大修费用的回收年限，当年限值小于等于1时，则超超临界机组锅炉给水泵进行维修。Further, when determining the maintenance interval, the change in economic parameters and the change in stability parameters are converted into the cost per unit time, and the sum of the various expenses consumed by the overhaul of the feed water pump and the economic impact of the overhaul of the feed water pump on the main engine are calculated. The converted costs are superimposed, and the difference between the cost value and the superimposed value is calculated to calculate the recovery period of the overhaul cost of the feed water pump. When the annual limit value is less than or equal to 1, the boiler feed water pump of the ultra-supercritical unit will be repaired.
上述方案中，参数变化量具体折算成耗费时，经济性数据的变化量就是泵的效率的下降，耗电量的增加，以此折算。稳定性数的变化量与经济性相对应。In the above scheme, the amount of parameter change is specifically converted into time consumption, and the amount of change in economic data is the decrease in pump efficiency and the increase in power consumption, which is converted into this. The amount of change in the stability number corresponds to the economy.
给水泵大修依次所消耗各项费用为设备维修就产生费用，包括人力物力等。The various expenses consumed by the overhaul of the feed water pump in turn are the expenses incurred for equipment maintenance, including manpower and material resources.
给水泵大修对主机经济性影响的折算的费用为部件购买，人力费用以及如需要停机带来的费用消耗等。The conversion cost of the economic impact of feed water pump overhaul on the main engine is the purchase of components, labor costs, and the cost of shutting down if necessary.
关于回收年限：给水泵通过维修后，经济稳定性得到提高而得到的收益，运行一段时间就抵消了维修所花费的人力物力，这段时间就是回收年限。About the payback period: After the feed water pump is repaired, the economic stability is improved. After a period of operation, the manpower and material resources spent on maintenance will be offset. This period of time is the payback period.
进一步的，所述稳定性参数包括：轴瓦振动幅值、转子的轴向位移及平衡室与泵入口压差。Further, the stability parameters include: the vibration amplitude of the bearing pad, the axial displacement of the rotor, and the pressure difference between the balance chamber and the pump inlet.
进一步的，所述稳定性参数为通过安装在超超临界机组锅炉给水泵上的测量表计直接测量获得的或者是通过DCS控制系统通讯传输获得的。Further, the stability parameter is obtained through direct measurement by a measuring meter installed on the boiler feed water pump of the ultra-supercritical unit or through communication transmission of the DCS control system.
进一步的，所述经济性参数包括：给水泵单耗、给水泵效率、给水泵总扬程及给水泵平衡室压力。给水泵总扬程为给水泵出口扬程、包括给水泵抽头扬程。Further, the economical parameters include: the unit consumption of the feed water pump, the efficiency of the feed water pump, the total head of the feed water pump and the pressure of the balance chamber of the feed water pump. The total lift of the feedwater pump is the outlet lift of the feedwater pump, including the tap lift of the feedwater pump.
进一步的，所述给水泵平衡室压力通过安装在给水泵平衡室的压力测量装置测量获得的，压力测量装置为压力传感器或压力测量计。Further, the pressure in the balance chamber of the feed water pump is obtained by measuring the pressure measurement device installed in the balance chamber of the feed water pump, and the pressure measurement device is a pressure sensor or a pressure gauge.
进一步的，通过获取给水泵出口流量、给水泵抽头流量、给水泵出口扬程、给水泵抽头扬程及给水泵的轴功率得到给水泵效率。Further, the feedwater pump efficiency is obtained by obtaining the feedwater pump outlet flow, the feedwater pump tap flow, the feedwater pump outlet lift, the feedwater pump tap lift, and the shaft power of the feedwater pump.
进一步的，所述给水泵出口流量及给水泵抽头流量是通过安装在给水泵出口及给水泵抽头处的流量计来获取或者直接采取DCS系统中的数据。Further, the flow rate at the outlet of the feed water pump and the flow rate at the tap of the feed water pump are obtained through flow meters installed at the outlet of the feed water pump and at the tap of the feed water pump, or the data in the DCS system are directly taken.
进一步的，通过获取给水泵出口压力、给水泵入口压力、给水泵出口水流速、给水泵入口水流速、给水泵出入口压力表标高差及给水泵出、入口平均重度得到给水泵出口扬程。Further, the outlet head of the feedwater pump is obtained by obtaining the outlet pressure of the feedwater pump, the inlet pressure of the feedwater pump, the flow rate of the outlet water of the feedwater pump, the flow rate of the inlet water of the feedwater pump, the elevation difference of the pressure gauge at the inlet and outlet of the feedwater pump, and the average gravity of the outlet and inlet of the feedwater pump.
进一步的，所述给水泵出口压力及给水泵入口压力为通过安装在给水泵出口及入口处的压力测量计测量获得，给水泵出口水流速及给水泵入口水流速为通过安装在给水泵出口及入口处的流速传感器测量获得或者通过程序计算获得，给水泵出入口压力表标高差通过压力测量装置测量后做差得到，给水泵出、入口平均重度为通过重度计算公式计算获得的。Further, the outlet pressure of the feed water pump and the inlet pressure of the feed water pump are obtained by measuring the pressure gauges installed at the outlet and inlet of the feed water pump, and the water flow rate at the outlet of the feed water pump and the water flow rate at the inlet of the feed water pump are obtained by measuring the pressure at the outlet and inlet of the feed water pump. The flow rate sensor at the inlet is measured or calculated by the program. The elevation difference of the pressure gauge at the inlet and outlet of the feedwater pump is obtained by measuring the difference with the pressure measuring device. The average gravity of the feedwater pump outlet and inlet is calculated by the gravity calculation formula.
进一步的，通过获取给水泵抽头压力、给水泵入口压力及给水泵抽头、入口平均重度得到给水泵抽头扬程。Further, the tap head of the feed water pump is obtained by obtaining the tap pressure of the feed water pump, the inlet pressure of the feed water pump, and the average gravity of the feed water pump tap and inlet.
进一步的，给水泵抽头、入口平均重度同样是通过重度计算公式计算获得的。Furthermore, the average weight of the taps and inlets of the feed water pump is also calculated through the weight calculation formula.
进一步的，所述给水泵单耗为每向锅炉供水一吨，给水泵所消耗的有用能量，在计算时将给水泵的功率与给水泵重量流量做比得到。Further, the unit consumption of the feed water pump is the useful energy consumed by the feed water pump for every ton of water supplied to the boiler, which can be obtained by comparing the power of the feed water pump with the weight flow rate of the feed water pump during calculation.
进一步的，对小汽机驱动给水泵，该给水泵的功率为给水泵的轴功率与小汽机内效率的比值或小汽机蒸汽流量、小汽机理想焓降及热功当量系数的乘积值。Further, for a small steam turbine driving a feedwater pump, the power of the feedwater pump is the ratio of the shaft power of the feedwater pump to the internal efficiency of the small steam turbine or the product value of the steam flow rate of the small steam turbine, the ideal enthalpy drop of the small steam turbine, and the thermal work equivalent coefficient.
小汽机蒸汽流量通过DCS系统获取数据，小汽机内效率、小汽机理想焓降及热功当量系数均为通过现有的计算公式获得，具体的计算方式为本领域的技术人员所公知的常识，此处不再详细介绍。The steam flow rate of the small steam turbine is obtained through the DCS system. The internal efficiency of the small steam turbine, the ideal enthalpy drop of the small steam turbine and the thermal work equivalent coefficient are all obtained through the existing calculation formulas. The specific calculation methods are common knowledge known to those skilled in the art. No more details here.
进一步的，对用电动机驱动的锅炉给水泵，给水泵的轴功率为电机输入功率与电机效率及偶合器效率乘积的值。Furthermore, for a boiler feed water pump driven by an electric motor, the shaft power of the feed water pump is the value of the product of the input power of the motor, the efficiency of the motor and the efficiency of the coupling.
电机输入功率为通过DCS系统获取数据，电机效率及偶合器效率通过相应的计算公式为本领域的技术人员所公知的常识，此处不再详细介绍。The input power of the motor is data obtained through the DCS system, and the corresponding calculation formulas for motor efficiency and coupling efficiency are common knowledge known to those skilled in the art, and will not be described in detail here.
进一步的，小汽轮机驱动的锅炉给水泵，根据获取的给水泵重量流量、给水泵出口水焓值、给水泵入口水焓值、给水泵出口水流速、给水泵入口水流速、给水泵杂散损失功率及热功当量系数得到给水泵的轴功率。给水泵重量流量为通过DCS系统获取数据，给水泵出口水焓值、给水泵入口水焓值、给水泵出口水流速、给水泵入口水流速、给水泵杂散损失功率及热功当量系数为本领域的技术人员所公知的常识，此处不再详细介绍。Further, for the boiler feed water pump driven by a small steam turbine, according to the obtained weight flow rate of the feed water pump, the water enthalpy value of the feed water pump outlet, the water enthalpy value of the feed water pump inlet, the water flow rate of the feed water pump outlet, the water flow rate of the feed water pump inlet, and the stray loss of the feed water pump The shaft power of the feedwater pump can be obtained from the power and thermal work equivalent coefficient. The weight and flow rate of the feed water pump is based on the data obtained through the DCS system, the water enthalpy value at the feed water pump outlet, the water enthalpy value at the feed water pump inlet, the water flow rate at the feed water pump outlet, the water flow rate at the feed water pump inlet, the stray loss power of the feed water pump and the thermal work equivalent coefficient Common knowledge known to those skilled in the art will not be described in detail here.
本发明的有益效果：Beneficial effects of the present invention:
本发明一段时间内，锅炉给水泵经济、稳定性数值的变化，有助于诊断锅炉给水泵的内部失效磨损情况及突发性剧烈故障的快速处理，新泵或刚刚修整完毕的给水泵的原始试验资料，可作为变化趋向的基准，测得变化数值后，经过一系列的比较计算，从而可以确定锅炉给水泵的最佳大修时间。这种确定大修时间的方法，弥补了原来定时计划检修对经济性影响考虑的不足，尤其使用于现代型高速、高压锅炉给水泵。In the present invention, changes in the economic and stability values of the boiler feed water pump within a certain period of time are helpful for diagnosing the internal failure and wear of the boiler feed water pump and the rapid treatment of sudden severe faults. The test data can be used as the benchmark of the change trend. After the change value is measured, a series of comparative calculations can be performed to determine the best overhaul time of the boiler feed water pump. This method of determining the overhaul time makes up for the lack of consideration of the economic impact of the original scheduled overhaul, especially for modern high-speed, high-pressure boiler feed pumps.
附图说明Description of drawings
图1本发明的方法流程图。Fig. 1 is a flow chart of the method of the present invention.
具体实施方式：detailed description:
下面结合附图对本发明进行详细说明：The present invention is described in detail below in conjunction with accompanying drawing:
不管是传统型高、中压锅炉给水泵，还是现代超超临界型高速、高压给水泵，其内部动静部件之间的磨损失效是不可避免的，一方面磨损增加了水从高压侧向低压侧的回流，使泵的运行参数及其经济性下降，另一方面磨损降低了动静之间水力支撑作用，随着磨损量的增大，转子的稳定性逐渐降低，当达到一定程度时，将会产生有水力脉动引起的振动，振动又进一步加剧动静之间的磨损，这样形成恶性循环。因此恰当地控制动静之间的失效磨损情况，是决定各种锅炉给水泵是否需要大修的首要因素，而磨损量可通过泵的性能参数、经济性指标以及稳定性参数的变化量来反映。也就是说，恰当地测得了性能和稳定性数值的变化量，也就间接地知道了动静之间的失效磨损情况，从而可以决定给水泵的最佳大修时间。Regardless of whether it is a traditional high- or medium-pressure boiler feed pump or a modern ultra-supercritical high-speed, high-pressure feed pump, wear and failure between internal moving and static parts is inevitable. On the one hand, wear increases the flow of water from the high-pressure side to the low-pressure side. The backflow of the pump reduces the operating parameters and economic efficiency of the pump. On the other hand, the wear reduces the hydraulic support between the dynamic and the static. With the increase of the wear, the stability of the rotor gradually decreases. When it reaches a certain level, it will Vibration caused by hydraulic pulsation is generated, and the vibration further aggravates the wear between movement and static, thus forming a vicious circle. Therefore, properly controlling the failure and wear between dynamic and static is the primary factor to determine whether various boiler feed water pumps need to be overhauled, and the amount of wear can be reflected by the changes in pump performance parameters, economic indicators, and stability parameters. That is to say, if the change of performance and stability values is properly measured, the failure and wear between dynamic and static can be known indirectly, so that the optimal overhaul time of the feed water pump can be determined.
基于上述分析，本申请综合调查了目前正在运行的几种高速、高压锅炉给水泵，根据各种泵的结构特点、检修使用情况、性能变化等方面的因素，参与国外大型锅炉给水泵的检修方式，结合目前国内性能测试的技术水平，拟合出合理确定现代高速、高压锅炉给水泵大修时间的程序，其框图如附页所示。Based on the above analysis, this application comprehensively investigates several high-speed and high-pressure boiler feed water pumps currently in operation, and participates in the maintenance methods of foreign large boiler feed water pumps according to the structural characteristics of various pumps, maintenance usage, performance changes and other factors. , combined with the current technical level of domestic performance testing, a procedure for reasonably determining the overhaul time of modern high-speed and high-pressure boiler feed pumps is fitted out, and its block diagram is shown in the attached page.
如图1所示，实施时的总体思路是：将投运初期或大修后测得的锅炉给水泵的原始经济稳定性数值，与实时运行的经济、稳定性数值相比较，得出变化数值，这些变化值是给水泵经过大修可以弥补消除的；统计出给水泵大修一次所消耗的人、财、物各项费用，以及给水泵大修时对主机经济性的影响；将上述两项进行折算统一单位后，进行经济性比较，得出大修一次所花费用的回收年限。通常认为如果大修一次所花费用能在正常运行后一年内回收，则对给水泵实施大修是合理的。为增加上述大修时间的可靠性，程序中也可加入锅炉给水泵主要部件的寿命计算。As shown in Figure 1, the general idea of implementation is: compare the original economic stability value of the boiler feed water pump measured at the initial stage of operation or after overhaul with the real-time economic and stability value to obtain the change value, These changes can be compensated and eliminated after the overhaul of the feedwater pump; calculate the human, financial, and material expenses consumed by the overhaul of the feedwater pump once, and the impact on the economics of the main engine during the overhaul of the feedwater pump; convert the above two items into a unified After the unit is completed, the economic comparison is carried out to obtain the payback period for a major overhaul. It is generally considered reasonable to overhaul a feedwater pump if the cost of an overhaul can be recovered within one year of normal operation. In order to increase the reliability of the overhaul time mentioned above, the life calculation of the main components of the boiler feed water pump can also be included in the program.
当然，一些意外的剧烈的机械故障，需要有早于最佳检修时间的设备停止，应用程序中经济稳定性数值的比较计算，也有助于这些意外剧烈机械故障的早期快速诊断，为合理的确定维护方案预先提供筹划信息。Of course, some unexpected severe mechanical failures require equipment to be stopped earlier than the optimal maintenance time. The comparative calculation of economic stability values in the application program is also helpful for the early and rapid diagnosis of these unexpected severe mechanical failures, which is a reasonable determination Maintenance plans provide planning information in advance.
锅炉给水泵的经济稳定性参数及测试计算方法：Economic stability parameters and test calculation methods of boiler feed water pump:
实现上述锅炉给水泵最佳大修时间的确定，除要详细统计大修引起的各种费用外，还必须准确确定锅炉给水泵的经济、稳定性数值。反映经济、性能的参数主要有：给水泵单耗(定义为：每向锅炉供水一吨，所消耗的有用能量)、效率、总扬程、平衡室压力，反映稳定性的参数主要是：轴瓦振动幅值、转子的轴向位移、平衡室与泵入口压差。对稳定性参数，现代型高速、高压锅炉给水泵一般都安装了测量表计，应用过程中可随时测量储存，进行比较。对经济性指标，尚需进行一些计算。下面简述各指标的测试计算方法。To realize the determination of the optimal overhaul time of the above-mentioned boiler feed water pump, in addition to detailed statistics of various costs caused by the overhaul, it is also necessary to accurately determine the economic and stability values of the boiler feed water pump. The parameters that reflect economy and performance mainly include: unit consumption of feed water pump (defined as: the useful energy consumed for every ton of water supplied to the boiler), efficiency, total head, balance chamber pressure, and the parameters that reflect stability mainly include: bearing bush vibration Amplitude, axial displacement of the rotor, pressure difference between the balance chamber and the pump inlet. For stability parameters, modern high-speed and high-pressure boiler feed water pumps are generally equipped with measuring meters, which can be measured and stored at any time during the application process for comparison. For economic indicators, some calculations are still needed. The test and calculation methods of each index are briefly described below.
3.1给水泵效率：3.1 Feed water pump efficiency:
基本公式： Basic formula:
式中：ηp—给水泵效率，％，In the formula: ηp—feed water pump efficiency, %,
G—给水泵出口流量，如果包括平衡室泄漏量应去除，kg/s，G—the outlet flow rate of the feed water pump, if the leakage of the balance chamber is included, it should be removed, kg/s,
Gm—给水泵抽头流量，kg/s，Gm—feed water pump tap flow rate, kg/s,
H—给水泵出口扬程，m，H—feed water pump outlet head, m,
Hm—给水泵抽头扬程，m，Hm—feed water pump tap head, m,
Psh—给水泵的轴功率，kw，Psh—shaft power of feed water pump, kw,
3.2给水泵扬程：3.2 Feed water pump head:
计算公式： Calculation formula:
式中：p2、pm、p1—给水泵出口、抽头、入口压力，Mpa，In the formula: p2, pm, p1—feed water pump outlet, tap, inlet pressure, Mpa,
γ—给水泵出、入口平均重度，kg/m3，γ—the average weight of feed water pump outlet and inlet, kg/m3,
γm—给水泵抽头、入口平均重度，kg/m3，γm—the average weight of feed water pump taps and inlets, kg/m3,
v2、v1--给水泵出、入口水流速，m/s，v2, v1--feed water pump out, inlet water flow rate, m/s,
ΔH—给水泵出入口压力表标高差，m，ΔH—the elevation difference of the pressure gauge at the inlet and outlet of the feed water pump, m,
3.3给水泵轴功率：3.3 Feedwater pump shaft power:
对用电动机驱动的锅炉给水泵，轴功率的确定比较容易，也比较准确，用瓦特表测定输入功率后，去除电机和偶合器的损失便可得到。For boiler feed pumps driven by motors, the determination of shaft power is relatively easy and accurate. After measuring the input power with a wattmeter, it can be obtained by removing the losses of the motor and coupling.
计算公式为：Psh＝PηeηcThe calculation formula is: Psh=Pηeηc
式中：P—电机输入功率，kw，In the formula: P—motor input power, kw,
ηe、ηc—分别为电机、偶合器效率，％。ηe, ηc—respectively motor, coupling efficiency, %.
对用小汽轮机驱动的锅炉给水泵，由于汽轮机的排出蒸汽状态难以准确测定，轴功率的确定不能直接测到。近年来热力学法测定给水泵效率的应用越来越广，特别在小汽机驱动的锅炉给水泵上，一些考核性试验应用此方法得到的结果，完全满足鉴定要求。这种方法需要准确测定给水泵进、出口水温，由于该温度差值较小，所需测量仪器的精度较高，且不允许有外部的冷、热源进入给水泵内。目前该温度可用精密铂电阻温度计测量，也可用贝克曼差式温度计测量进、出水温差，两种方法的测试精度，均能达到经济性分析的要求。For the boiler feed water pump driven by a small steam turbine, it is difficult to accurately measure the exhaust steam state of the steam turbine, and the determination of the shaft power cannot be directly measured. In recent years, the application of thermodynamic method to measure the efficiency of feed water pumps has become more and more widespread, especially on boiler feed water pumps driven by small steam turbines. The results obtained by using this method in some assessment tests fully meet the identification requirements. This method needs to accurately measure the water temperature at the inlet and outlet of the feed water pump. Since the temperature difference is small, the accuracy of the measuring instruments required is high, and no external cold or heat sources are allowed to enter the feed water pump. At present, the temperature can be measured with a precision platinum resistance thermometer, or with a Beckman differential thermometer to measure the temperature difference between the inlet and outlet water. The test accuracy of the two methods can meet the requirements of economic analysis.
热力学法测定给水泵效率的计算公式主要有：The calculation formulas for determining the efficiency of feed water pumps by thermodynamic method mainly include:
式中：G—给水泵重量流量，kg/s,In the formula: G—weight flow rate of feed water pump, kg/s,
A—热功当量系数A—thermal work equivalent coefficient
i2、i1—泵出、入口水焓值，kj/kg，i 2 , i 1 —Enthalpy value of pumped and inlet water, kj/kg,
c2、c1—泵出、入口水流速，m/s，c 2 , c 1 - pump out, inlet water flow rate, m/s,
z2、z1—泵出、入口测点位置标高，m，z 2 , z 1 — elevation of pump outlet and inlet measuring points, m,
Ng—给水泵杂散损失功率，kw，参见文献(1)、(2)N g — stray power loss of feed water pump, kw, refer to literature (1), (2)
kg—给水泵杂散损失系数，参见文献(1)、(2)k g —the stray loss coefficient of the feed water pump, see literature (1), (2)
Δt—给水泵出、入水温度差，℃，Δt—the temperature difference between the feed water pump outlet and inlet water, °C,
Δts—等熵温升，℃，Δt s —isentropic temperature rise, °C,
3.4给水泵单耗3.4 Unit consumption of feed water pump
计算公式：e＝P/GCalculation formula: e=P/G
对小汽机驱动给水泵：P＝Psh/ηr或P＝GsHtAFor small steam turbine driven feed water pump: P=P sh /η r or P=G s H t A
式中：e—给水泵单耗kwh/tIn the formula: e—unit consumption of feed water pump kwh/t
ηr—小汽机内效率，％，η r —the internal efficiency of the small steam turbine, %,
Gs—小汽机蒸汽流量，kg/h,G s —Steam flow of small turbine, kg/h,
Ht—小汽机理想焓降,kj/kg,H t — ideal enthalpy drop of small steam turbine, kj/kg,
其他符号意义同前。The meanings of other symbols are the same as before.
文献(1).《微温差法泵特性试验》华东电力科学研究所1984.01；文献(2).《用贝克曼差示温度计测量水泵效率》华东电力科学研究所1984.08。Document (1). "Pump Characteristic Test by Micro-temperature Difference Method", East China Electric Power Research Institute, 1984.01; Document (2). "Measuring Water Pump Efficiency with Beckman Differential Thermometer", East China Electric Power Research Institute, 1984.08.
上述虽然结合附图对本发明的具体实施方式进行了描述，但并非对本发明保护范围的限制，所属领域技术人员应该明白，在本发明的技术方案的基础上，本领域技术人员不需要付出创造性劳动即可做出的各种修改或变形仍在本发明的保护范围以内。Although the specific implementation of the present invention has been described above in conjunction with the accompanying drawings, it does not limit the protection scope of the present invention. Those skilled in the art should understand that on the basis of the technical solution of the present invention, those skilled in the art do not need to pay creative work Various modifications or variations that can be made are still within the protection scope of the present invention.
Claims (10)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610538211.XA CN106678031B (en) | 2016-07-08 | 2016-07-08 | The method for determining Boiler of Ultra-supercritical Unit feed pump maintenance maintenance interval |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610538211.XA CN106678031B (en) | 2016-07-08 | 2016-07-08 | The method for determining Boiler of Ultra-supercritical Unit feed pump maintenance maintenance interval |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106678031A true CN106678031A (en) | 2017-05-17 |
| CN106678031B CN106678031B (en) | 2018-08-14 |
Family
ID=58840007
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610538211.XA Active CN106678031B (en) | 2016-07-08 | 2016-07-08 | The method for determining Boiler of Ultra-supercritical Unit feed pump maintenance maintenance interval |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106678031B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113971485A (en) * | 2021-10-21 | 2022-01-25 | 新奥数能科技有限公司 | Method, device and electronic device for predicting remaining maintenance time of industrial boiler system |
| CN114396322A (en) * | 2022-01-18 | 2022-04-26 | 中电华创电力技术研究有限公司 | Method and device for judging A-level overhaul of steam turbine body of deep peak shaving unit |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1731126A (en) * | 2005-08-08 | 2006-02-08 | 承慰才 | Self-regulating type vapor sampling rack for super (super) critical generator set |
| CN102226513A (en) * | 2011-05-24 | 2011-10-26 | 山东电力研究院 | A fault-optimized control method for one-side auxiliary machine of a supercritical unit |
| WO2012017972A1 (en) * | 2010-08-05 | 2012-02-09 | Ebara Corporation | Exhaust system |
| EP2843237A1 (en) * | 2012-04-24 | 2015-03-04 | Edwards Japan Limited | Deposit detection device for exhaust pump, and exhaust pump |
| CN104482525A (en) * | 2014-12-25 | 2015-04-01 | 广东电网有限责任公司电力科学研究院 | Method and system for controlling reheating steam temperature of ultra supercritical unit |
| CN204492904U (en) * | 2014-10-31 | 2015-07-22 | 中国大唐集团科学技术研究院有限公司 | Many steam turbine cogeneration extra-supercritical unit |
-
2016
- 2016-07-08 CN CN201610538211.XA patent/CN106678031B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1731126A (en) * | 2005-08-08 | 2006-02-08 | 承慰才 | Self-regulating type vapor sampling rack for super (super) critical generator set |
| WO2012017972A1 (en) * | 2010-08-05 | 2012-02-09 | Ebara Corporation | Exhaust system |
| CN102226513A (en) * | 2011-05-24 | 2011-10-26 | 山东电力研究院 | A fault-optimized control method for one-side auxiliary machine of a supercritical unit |
| EP2843237A1 (en) * | 2012-04-24 | 2015-03-04 | Edwards Japan Limited | Deposit detection device for exhaust pump, and exhaust pump |
| CN204492904U (en) * | 2014-10-31 | 2015-07-22 | 中国大唐集团科学技术研究院有限公司 | Many steam turbine cogeneration extra-supercritical unit |
| CN104482525A (en) * | 2014-12-25 | 2015-04-01 | 广东电网有限责任公司电力科学研究院 | Method and system for controlling reheating steam temperature of ultra supercritical unit |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113971485A (en) * | 2021-10-21 | 2022-01-25 | 新奥数能科技有限公司 | Method, device and electronic device for predicting remaining maintenance time of industrial boiler system |
| CN114396322A (en) * | 2022-01-18 | 2022-04-26 | 中电华创电力技术研究有限公司 | Method and device for judging A-level overhaul of steam turbine body of deep peak shaving unit |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106678031B (en) | 2018-08-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102967464B (en) | The improved method of evaluating performance of condensing turbine high back pressure | |
| CN100437015C (en) | On-line monitoring method for variation of through-flow gap of steam turbine | |
| CN101320253A (en) | Method and system for on-line life management of main components of multiple generating sets at factory level | |
| CN101561676B (en) | On-line monitoring and control device and method for remaining life of thermal power generation unit components | |
| US8135568B2 (en) | Turbomachine airfoil life management system and method | |
| CN101320259A (en) | A method and system for life management of important components of a unit generator set host | |
| CN106092594A (en) | A kind of strong robustness gas turbine gas path component performance diagnogtics method of anti-sensor fault | |
| CN107340137B (en) | Turbine efficiency on-line monitoring system device and method for heavy gas turbine | |
| CN105912878A (en) | Gas turbine adaptive gas circuit component performance diagnostic method based on combination of thermal model and particle swarm optimization | |
| CN106908249B (en) | A kind of diagnostic method of the through-flow stage efficiency exception of steam turbine high-pressure cylinder | |
| CN102749156A (en) | A method for detecting steam turbine exhaust enthalpy | |
| CN107543733A (en) | A kind of condenser duty on-line monitoring system and measuring method | |
| JP2002122005A (en) | Thermal efficiency diagnostic method and device for thermal power plant | |
| CN105225008A (en) | A kind of method predicting thermodynamic system of steam tur internal operation parameter | |
| CN106678031B (en) | The method for determining Boiler of Ultra-supercritical Unit feed pump maintenance maintenance interval | |
| CN106761967B (en) | Pusher side steam parameter measured deviation consumes the appraisal procedure and system of coal cost to unit | |
| CN101231209A (en) | A vibration reduction experimental system for turbine blades with damping structure | |
| CN109709911B (en) | On-line measuring method and system for leakage of circulating working medium of thermal power generating unit | |
| CN204532445U (en) | Supercritical Pressure Steam Turbine rotor thermal stress on-line monitoring system | |
| CN113107675B (en) | Method for determining temperature before turbine of core machine based on power balance | |
| CN103498706A (en) | Turboset performance monitoring and diagnosing method based on general logic table | |
| CN104408540A (en) | Assessment method of energy saving quantity of improved steam turbine | |
| RU2395723C1 (en) | Method of operating pump unit in injection of fluid into formation | |
| CN114412447B (en) | Fault detection method and device for screw pump well | |
| CN116929670A (en) | A high-pressure heater leakage diagnosis method based on self-updating MSET |
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 |