WO2023088279A1

WO2023088279A1 - System and method for improving rb working condition of induced draft fan of two-boiler one-machine thermal power generating unit

Info

Publication number: WO2023088279A1
Application number: PCT/CN2022/132140
Authority: WO
Inventors: 王田; 李楠; 赵容; 李颖博; 刘育婷; 马乐; 郝德锋; 常威武; 景丽; 朱洁; 葛欢
Original assignee: 西安热工研究院有限公司
Priority date: 2021-11-18
Filing date: 2022-11-16
Publication date: 2023-05-25
Also published as: CN113898971A

Abstract

A system and method for improving an RB working condition of an induced draft fan of a two-boiler one-machine thermal power generating unit. An outlet of a first boiler (1) is in communication with one end of a first induced draft main pipe (10), and the other end of the first induced draft main pipe (10) is in communication with an input end of a first induced draft fan (4) and an input end of a second induced draft fan (6); an outlet of a second boiler (11) is in communication with one end of a second induced draft main pipe (17), and the other end of the second induced draft main pipe (17) is in communication with an input end of a third induced draft fan (14) and an input end of a fourth induced draft fan (16); one end of a communicating pipe (18) is in communication with the first induced draft main pipe (10), and the other end of the communicating pipe (18) is in communication with the second induced draft main pipe (17); an electric regulating valve (9) is arranged on the communicating pipe (18); a first pressure transmitter (2) and a second pressure transmitter (12) are respectively arranged on the first boiler (1) and the second boiler (11); and a PID controller (8) is connected to each of the first pressure transmitter (2), the second pressure transmitter (12) and the electric regulating valve (9). The system can effectively solve the problem of induced draft fan RB caused by the failure of only one boiler induced draft fan in a two-boiler one-machine unit.

Description

一种改善两炉一机火电机组引风机RB工况的***及方法A system and method for improving the RB working conditions of induced draft fans of two furnaces and one thermal power unit

技术领域technical field

本公开涉及火电站自动控制技术领域，具体涉及一种改善两炉一机火电机组引风机RB工况的***及方法。The present disclosure relates to the technical field of automatic control of thermal power plants, in particular to a system and method for improving the working condition of RB of induced draft fans of two furnaces and one thermal power unit.

背景技术Background technique

RB的功能是指运行中的辅机在出现异常和故障的情况下，机组负荷指令和燃料量快速反应，机组主要自动控制***互相配合，将机组负荷快速稳定地降低至机组实际允许的最大出力，且保证机组的继续安全运行。现有火电机组中，大多数机组都配备两台60％额定出力(因为引风机和脱硫***的增压风机合二为一)的引风机作为锅炉的风烟***通流的主要动力输出，也是维持锅炉微负压状态下正常运行的重要手段。当一台引风机发生故障跳闸，失去出力能力时，机组需要以一个机组可以承受的最快速度甩掉50％负荷，退出50％的固态燃料量，并迅速恢复稳定燃烧状态。火电行业中把这个故障过程称之为引风RNUBACK，俗称引风机RB。而两炉一机火电机组引风机RB工况存在两种情况：一，其中一台锅炉引风机故障跳闸引发机组引风机RB，为了确保并气阀前蒸汽品质一致，另一台引风***完好的锅炉也必须跟随引风机***故障的锅炉，同时同速度且保证蒸汽品质，降出力至目标负荷，直至整个机组降负荷至50％额定负荷；二，两台锅炉同时各有一台引风机故障跳闸，引发整个机组引风机RB工况。The function of RB means that in the case of abnormality and failure of the auxiliary machine in operation, the unit load command and fuel quantity can respond quickly, and the main automatic control system of the unit cooperates with each other to quickly and stably reduce the unit load to the actual maximum output allowed by the unit , and ensure the continued safe operation of the unit. Among the existing thermal power units, most of the units are equipped with two induced draft fans with 60% rated output (because the induced draft fan and the booster fan of the desulfurization system are combined into one) as the main power output of the air and smoke system of the boiler. It is an important means to maintain the normal operation of the boiler under the micro-negative pressure state. When an induced draft fan fails and trips and loses its output capacity, the unit needs to shed 50% of the load at the fastest speed a unit can bear, withdraw 50% of the solid fuel, and quickly restore a stable combustion state. In the thermal power industry, this failure process is called induced draft RNUBACK, commonly known as induced draft fan RB. There are two situations in the RB working condition of the induced draft fan of the thermal power unit with two boilers: 1. The induced draft fan RB of one of the boilers trips due to a failure. The boiler must also follow the boiler with the induced draft fan system failure, at the same time at the same speed and ensure the steam quality, reduce the output to the target load, until the load of the entire unit is reduced to 50% of the rated load; two, each of the two boilers has an induced draft fan failure trip at the same time , triggering the RB working condition of the induced draft fan of the whole unit.

在两炉一机机组发生引风机RB的过程中，机组负荷控制器会自动快速甩掉多余的50％负荷；两台锅炉的燃料***自动以相近的(与锅炉本身特性有关，目的是确保两台锅炉产生的蒸汽品质在机组正常运行允许的偏差范围之内)速率快速减掉多余的50％燃料量；同时，匹配燃料量的减少速度，同时减掉各自锅炉50％的一次风量；两台锅炉炉膛负压控制***为了维持炉膛负压不变，各个锅炉的送风机也应快速减少50％出力。引风***的主要作用是确保锅炉炉膛内风烟的通流动力，进而保证煤粉燃烧后的高温烟气一次通过高温过热器、低温过热器、省煤器、空预器、电除尘、脱硫***等一系列布置在炉后的环保增效设施，让燃烧后的煤粉释放出的热量得到充分的利用，提高锅炉的热效率；同时为炉膛内煤粉燃烧后释放的热量和留下的烟灰，顺利离开炉膛提供足够的动力，从而也维持了炉膛内的压力始终在机组允许的范围之内。所以当引风***出力的大幅度的减少，就直接影响炉膛负压的稳定。在引风机RB发生时，第一个发生变化的就是炉膛负压，炉膛负压会随着引风***一台引风机的跳闸而突然跳崖式的降低，随着送风***紧急跳闸一台送风机，来匹配炉膛突然失去50％通流能力的引风***，炉膛负压会有一个短暂的下降，然后随着炉膛内因为锅炉突然降负荷而未及时撤出的多余燃料燃烧释放的热量，带来的炉膛负压临时性瞬间爬升，这个过程对引风机***的快速响应有着极大的挑战。引风机的快速响应极有可能满足不了炉膛负压的迅速变化，而带来的结果就是机组因为炉膛负压的超限跳机。During the process of induced draft fan RB in two furnaces and one unit, the unit load controller will automatically and quickly shed the excess 50% load; The steam quality produced by each boiler is within the allowable deviation range for the normal operation of the unit) quickly reduce the excess fuel volume by 50%; at the same time, match the reduction speed of the fuel volume, and reduce the primary air volume of each boiler by 50% at the same time; two Boiler Furnace Negative Pressure Control System In order to maintain the constant furnace negative pressure, the blower fans of each boiler should also quickly reduce the output by 50%. The main function of the air induction system is to ensure the flow of air and smoke in the boiler furnace, thereby ensuring that the high-temperature flue gas after pulverized coal combustion passes through the high-temperature superheater, low-temperature superheater, economizer, air preheater, electrostatic precipitator, and desulfurization. A series of environmental protection and efficiency-enhancing facilities such as the system are arranged behind the furnace to make full use of the heat released by the pulverized coal after combustion and improve the thermal efficiency of the boiler; , leaving the furnace smoothly to provide enough power, thus also maintaining the pressure in the furnace is always within the allowable range of the unit. Therefore, when the output of the induced draft system is greatly reduced, it will directly affect the stability of the furnace negative pressure. When the induced draft fan RB occurs, the first thing that changes is the negative pressure of the furnace. The negative pressure of the furnace will suddenly drop off a cliff with the tripping of one induced draft fan in the induced draft system. The blower is used to match the induced draft system where the furnace suddenly loses 50% of its flow capacity. The negative pressure of the furnace will drop for a short time, and then the heat released by the burning of excess fuel that has not been withdrawn in time due to the sudden load reduction of the boiler in the furnace, The negative pressure of the furnace caused by the temporary and instantaneous climb, this process has a great challenge to the rapid response of the induced draft fan system. The rapid response of the induced draft fan may not be able to meet the rapid changes in the negative pressure of the furnace, and the result is that the unit trips due to the negative pressure of the furnace exceeding the limit.

其次，体现在炉膛内燃烧的不稳定。当引风机RB的发生，燃料***以一定的速率(根据锅炉特性设置最大速率)快速退出预先选定的运行磨组***来适应引风机RB后的机组负荷指令，随着磨组***的不断退出，进入炉膛内燃料的快速减少，炉膛内因为煤粉燃烧释放的热量也越来越少，然而锅炉引风机在其少了一半出力的情况下，还得维持剧烈波动的炉膛负压在保护值以内，这样就造成炉膛内空气流动场极其不稳定，进而促使炉膛内的温度场变化剧烈，极容易造成炉膛内所有运行磨组失去着火条件而退出运行状态，最终机组因为炉膛灭火信号跳机。Secondly, it reflects the instability of combustion in the furnace. When the induced draft fan RB occurs, the fuel system quickly withdraws from the pre-selected operating grinding group system at a certain rate (the maximum rate is set according to the boiler characteristics) to adapt to the unit load command after the induced draft fan RB. With the continuous withdrawal of the grinding group system , the rapid reduction of fuel entering the furnace, the heat released by the combustion of pulverized coal in the furnace is also less and less, but the boiler induced draft fan has to maintain the violently fluctuating negative pressure of the furnace at the protection value when its output is reduced by half In this way, the air flow field in the furnace is extremely unstable, which in turn causes the temperature field in the furnace to change drastically, and it is very easy to cause all the running grinding groups in the furnace to lose the fire conditions and exit the operating state, and finally the unit trips due to the fire extinguishing signal of the furnace.

引风机RB发生后，由于辅助燃烧的送风***也跟随引风***跳闸一台送风机，造成辅助炉膛燃烧的送风***出力不足，造成大面积未燃烧充分的煤粉滞留于炉膛中，然而此时极其不稳定的空气动力场，又为煤粉滞留在锅炉尾部烟道提供了机会，随着时间的延长，尾部烟道未充分燃烧的煤粉越积越多，到达一定程度后，就会在尾部烟道瞬间爆燃，损坏锅炉尾部烟道换热区，给发电企业带来不可挽回的经济损失。After the occurrence of induced draft fan RB, because the auxiliary combustion air supply system also tripped a supply fan following the induced air system, the output of the auxiliary furnace combustion air supply system was insufficient, resulting in a large area of unburned pulverized coal remaining in the furnace. The extremely unstable aerodynamic field provides an opportunity for pulverized coal to stay in the tail flue of the boiler. As time goes on, the coal powder that is not fully burned in the tail flue will accumulate more and more. After reaching a certain level, it will Instant deflagration in the tail flue will damage the heat exchange area of the boiler tail flue and bring irreparable economic losses to the power generation company.

两炉一机母管制机组，锅炉出口蒸汽品质的一致性是制约机组安全运行的关键参数之一，当两台锅炉出口蒸汽参数偏差超过机组维持安全运行的允许值时，并气阀后的蒸汽在融合的过程中，蒸汽管道会产生剧烈震动，严重会使蒸汽管道断裂，高温高压蒸汽外露，造成人员和设备的巨大损伤。当两炉一机机组发生引风机RB时，两台锅炉在确保机组安全的前提下，保持并气阀前蒸汽品质在允许的范围之内，从而确保机组RB工况顺利完成。然而让两台锅炉以一致的极限速度降至RB工况的目标负荷，对两台锅炉的所有辅机也是一个极限考验，对锅炉的运行人员的专业技能水平也是一个的极限考验。任何一个环节出现操作不当，都会给机组非计划停机，更甚者可能发生设备损坏或者人员的损伤，给发电企业带来不可想象的人员或者经济损失。For two boilers and one machine master control unit, the consistency of boiler outlet steam quality is one of the key parameters restricting the safe operation of the unit. When the deviation of the steam parameters at the outlet of the two boilers exceeds the allowable value for the unit to maintain safe operation, the steam after the parallel valve During the fusion process, the steam pipe will vibrate violently, which will seriously break the steam pipe, expose high-temperature and high-pressure steam, and cause huge damage to personnel and equipment. When the induced draft fan RB occurs in the two boilers and one unit, the two boilers will keep the steam quality before the parallel valve within the allowable range under the premise of ensuring the safety of the unit, so as to ensure the smooth completion of the RB working condition of the unit. However, letting the two boilers drop to the target load of the RB working condition at the same limit speed is also a limit test for all auxiliary machines of the two boilers, and it is also a limit test for the professional skills of the boiler operators. Improper operation in any link will cause unplanned shutdown of the unit, and even equipment damage or personnel injury may occur, which will bring unimaginable personnel or economic losses to the power generation company.

现有的两炉一机机组引风机RB方式存在以下几个问题：There are several problems in the existing two-boiler and one-unit induced draft fan RB mode:

第一，整个机组所有辅机同时快速减少50％负荷，给运行人员带来的工作量和精神压力是显而易见的；设备的快速响应对设备材料的质量也是一个极大的考验，并且多次的快速大幅度变负荷，对设备带来的隐性损伤也是不可忽略的。First, all the auxiliary machines of the entire unit quickly reduce the load by 50% at the same time, which brings obvious workload and mental pressure to the operating personnel; the rapid response of the equipment is also a great test for the quality of the equipment materials, and many times The hidden damage to the equipment caused by rapid and large load changes cannot be ignored.

第二，引风机RB发生，送风***紧急跳闸一台送风机，来匹配锅炉风烟***损失的通流能力，然而送风***出力能力的大幅度减少，促使炉膛内辅助煤粉燃烧的二次风量减少，造成大面积未燃烧充分的煤粉滞留于炉膛中；然而此时极其不稳定的空气动力场，又为煤粉滞留在锅炉尾部烟道提供了机会，随着时间的延长，尾部烟道未充分燃烧的煤粉越积越多，到达一定程度后，就会在尾部烟道瞬间爆燃，损坏锅炉尾部烟道换热区，给发电企业带来不可挽回的经济损失。Second, the RB of the induced draft fan occurs, and the air supply system trips an air supply fan in an emergency to match the flow capacity lost by the boiler's air and smoke system. The reduction in air volume caused a large area of unburned pulverized coal to stay in the furnace; however, the extremely unstable aerodynamic field at this time provided opportunities for the pulverized coal to stay in the tail flue of the boiler. As time went on, the tail smoke The pulverized coal that has not been fully burned in the flue will accumulate more and more, and when it reaches a certain level, it will deflagrate instantly in the tail flue, damaging the heat exchange area of the tail flue of the boiler, and bringing irreparable economic losses to the power generation company.

第三，引风机RB，造成炉膛负压波动剧烈，瞬间甚至可以达到锅炉极限保护值，甚至是超过极限值，造成机组非计划停机；虽说超过极限保护值的时间不长，但是频繁如此超限运行，对锅炉的材料寿命也是大大地考验。Thirdly, the induced draft fan RB causes the furnace negative pressure to fluctuate violently, and can even reach the limit protection value of the boiler in an instant, or even exceed the limit value, causing the unit to shut down unplanned; although the time for exceeding the limit protection value is not long, it is frequently exceeded. Operation is also a great test for the life of the boiler material.

第四，引风机RB发生，两台锅炉负荷同时剧烈变化给机组维持并气阀前蒸汽品质的一致性，对运行人员的业务能力是一个巨大的挑战，同时给运行人员带来的工作强度也是显而易见的，稍有不慎，轻者造成机组非计划停机，重者机组设备严重受损，给发电企业带来不可估量的经济损失。Fourth, the RB of the induced draft fan occurs, and the load of the two boilers changes drastically at the same time. It is a huge challenge for the operating personnel to maintain the consistency of the steam quality before the parallel valve. Obviously, a little carelessness will cause unplanned shutdown of the unit in the mild case, and serious damage to the equipment of the unit in severe cases, which will bring immeasurable economic losses to the power generation company.

发明内容Contents of the invention

针对现有技术中存在的问题，本公开提供了一种改善两炉一机火电机组引风机RB工况的***及方法，能够有效解决两炉一机机组只有一台锅炉引风机出现故障而引起的引风机RB问题，对改善两炉一机火电机组引风机RB稳定性，延长锅炉关键设备寿命，减少机组主要辅机设备因引风机RB造成非计划停机的次数，降低维护维修成本等都具有重要的意义。Aiming at the problems existing in the prior art, the present disclosure provides a system and method for improving the RB working condition of the induced draft fan of the two-boiler and one-machine thermal power unit, which can effectively solve the problem caused by the failure of only one boiler-induced fan in the two-boiler and one-machine unit. The RB problem of the induced draft fan can improve the stability of the induced draft fan RB of the two boilers and one thermal power unit, prolong the life of key boiler equipment, reduce the number of unplanned shutdowns of the main auxiliary equipment of the unit due to the induced draft fan RB, and reduce maintenance and repair costs. Significance.

为了解决上述技术问题，本公开通过以下技术方案予以实现：In order to solve the above technical problems, the present disclosure is realized through the following technical solutions:

一种改善两炉一机火电机组引风机RB工况的***，包括第一锅炉、第一引风母管、第一压力变送器、第一引风机、第二引风机、第二锅炉、第二引风母管、第二压力变送器、第三引风机、第四引风机、连通管、电动调节阀门和PID控制器，所述第一锅炉的出口与所述第一引风母管的一端连通，所述第一引风母管的另一端与所述第一引风机和第二引风机的输入端连通，所述第二锅炉的出口与所述第二引风母管的一端连通，所述第二引风母管的另一端与所述第三引风机和所述第四引风机的输入端连通，所述连通管的一端与所述第一引风母管连通，所述连通管的另一端与所述第二引风母管连通，所述电动调节阀门设置在所述连通管上，所述第一压力变送器和所述第二压力变送器分别设置在所述第一锅炉和所述第二锅炉上，所述PID控制器分别与所述第一压力变送器、所述第二压力变送器和所述电动调节阀门连接。A system for improving the RB working condition of the induced draft fan of a thermal power unit with two boilers, including a first boiler, a first induced air main pipe, a first pressure transmitter, a first induced draft fan, a second induced draft fan, a second boiler, The second induced air main pipe, the second pressure transmitter, the third induced draft fan, the fourth induced draft fan, the communication pipe, the electric regulating valve and the PID controller, the outlet of the first boiler is connected to the first induced air main One end of the pipe is connected, the other end of the first induced air main pipe is connected with the input ends of the first induced draft fan and the second induced draft fan, and the outlet of the second boiler is connected with the second induced air main pipe. One end is communicated, the other end of the second induced air main pipe is communicated with the input ends of the third induced air fan and the fourth induced air fan, and one end of the communication pipe is communicated with the first induced air main pipe, The other end of the communication pipe communicates with the second air induction main pipe, the electric regulating valve is arranged on the communication pipe, and the first pressure transmitter and the second pressure transmitter are respectively arranged On the first boiler and the second boiler, the PID controller is respectively connected with the first pressure transmitter, the second pressure transmitter and the electric regulating valve.

进一步地，所述电动调节阀门位于所述连通管的中间位置。Further, the electric regulating valve is located in the middle of the communicating pipe.

进一步地，所述连通管与所述第一引风母管的连接位置靠近所述第一锅炉的出口位置，所述连通管与所述第二引风母管的连接位置靠近所述第二锅炉的出口位置。Further, the connection position between the communication pipe and the first air induction main pipe is close to the outlet of the first boiler, and the connection position between the communication pipe and the second air induction main pipe is close to the second Boiler outlet location.

进一步地，所述第一引风机和所述第二引风机的输入端分别设置有第一阀门和第二阀门，所述第三引风机和所述第四引风机的输入端分别设置有第三阀门和第四阀门。Further, the input ends of the first induced draft fan and the second induced draft fan are respectively provided with a first valve and a second valve, and the input ends of the third induced draft fan and the fourth induced draft fan are respectively provided with a first valve. Three valves and a fourth valve.

进一步地，所述第一引风机、所述第二引风机、所述第三引风机和所述第四引风机的输出端均连接有烟囱。Further, chimneys are connected to output ends of the first induced draft fan, the second induced draft fan, the third induced draft fan and the fourth induced draft fan.

进一步地，所述PID控制器选择ovation***或HNICS-T316。Further, the PID controller selects ovation system or HNICS-T316.

一种改善两炉一机火电机组引风机RB工况的方法，应用所述的***，当所述第一引风机、所述第二引风机、所述第三引风机和所述第四引风机中的任意一台引风机发生故障，两炉一机火电机组引风机RB触发时，包括：A method for improving the working condition of the induced draft fan RB of the thermal power unit with two furnaces and one machine. Using the system, when the first induced draft fan, the second induced draft fan, the third induced draft fan and the fourth induced draft fan When any one of the induced draft fans fails, and the induced draft fan RB of the two furnaces and one thermal power unit is triggered, including:

控制剩余的三台引风机正常工作，所述PID控制器根据发生故障的引风机对应的锅炉上安装的压力变送器采集到的锅炉炉膛压力，控制调节所述连通管上的所述电动调节阀门的开度，使得发生故障的引风机对应的锅炉炉膛压力在安全波动范围内，进而使得所述第一锅炉和所述第二锅炉趋于稳定状态。Control the remaining three induced draft fans to work normally, and the PID controller controls and adjusts the electric adjustment on the connecting pipe according to the boiler furnace pressure collected by the pressure transmitter installed on the boiler corresponding to the failed induced draft fan. The opening of the valve makes the boiler furnace pressure corresponding to the failed induced draft fan within a safe fluctuation range, thereby making the first boiler and the second boiler tend to a stable state.

进一步地，两炉一机火电机组引风机RB触发之前，若机组负荷大于75％的额定负荷时，控制剩余的三台引风机将出力调至最大；Further, before the induced draft fan RB of the two furnaces and one thermal power unit is triggered, if the unit load is greater than 75% of the rated load, control the remaining three induced draft fans to adjust the output to the maximum;

待所述第一锅炉和所述第二锅炉趋于稳定状态后，控制剩余的三台引风机以一定速率调至额定负荷运行。After the first boiler and the second boiler tend to be in a stable state, the remaining three induced draft fans are controlled to operate at a rated load at a certain speed.

进一步地，所述第一锅炉和所述第二锅炉趋于稳定状态后，继续控制剩余的三台引风机正常工作，使得机组负荷保持75％的额定负荷。Further, after the first boiler and the second boiler tend to a stable state, continue to control the remaining three induced draft fans to work normally, so that the unit load remains at 75% of the rated load.

进一步地，所述第一锅炉和所述第二锅炉趋于稳定状态后，按照预设的负荷变化率降低机组负荷至50％，直至与发生故障的引风机不连接的锅炉所对应的任意一台引风机安全停止，在降低机组负荷的同时，所述PID控制器根据发生故障的引风机对应的锅炉上安装的压力变送器采集到的锅炉炉膛压力，控制调节所述连通管上的所述电动调节阀门的开度，使得发生故障的引风机对应的锅炉炉膛压力在安全波动范围内，进而使得所述第一锅炉和所述第二锅炉趋于稳定状态。Further, after the first boiler and the second boiler tend to be in a stable state, the load of the unit is reduced to 50% according to the preset load change rate, until any boiler corresponding to the failed induced draft fan is not connected. The induced draft fan is safely stopped, and while reducing the load of the unit, the PID controller controls and adjusts the pressure on the connecting pipe according to the boiler furnace pressure collected by the pressure transmitter installed on the boiler corresponding to the failed induced draft fan. The opening of the valve is electrically adjusted, so that the furnace pressure of the boiler corresponding to the failed induced draft fan is within the safe fluctuation range, so that the first boiler and the second boiler tend to be in a stable state.

与现有技术相比，本公开至少具有以下有益效果：当第一引风机、第二引风机、第三引风机和第四引风机中的任意一台引风机发生故障，两炉一机火电机组引风机RB触发时，控制剩余的三台引风机正常工作，PID控制器根据发生故障的引风机对应的锅炉上安装的压力变送器采集到的锅炉炉膛压力，控制调节连通管上的电动调节阀门的开度，使得发生故障的引风机对应的锅炉炉膛压力在安全波动范围内，进而使得第一锅炉和第二锅炉趋于稳定状态。两炉一机火电机组的引风机RB过程中，本公开提高了机组负荷指令的目标值，改善了两炉一机负荷指令下降的速率，缩短了两炉一机火电机组引风机RB过程时间，从而延缓了机组固态燃料撤出炉膛的过程。两炉一机火电机组再发生引风机RB时，机组负荷不需要迅速下降，机组所有辅机也不需要配合机组负荷迅速下降，机组的主要参数炉膛负压，主燃料量，主蒸汽压力，主蒸汽温度，主给水流量等再不需要大幅度的波动，给机组带来意想不到的损失。在本公开的帮助下，两炉一机火电机组引风机RB发生时，操作员只需要从容地等待引风机RB过程结束，机组工况恢复稳定。本公开最大程度地降低了发电企业在两炉一机火电机组引风机RB过程中设备损害的几率，减少了因为引风机RB造成机组非计划内停机的次数。间接地为发电企业创造了经济效益。在现有火电站***硬件结构基础上，无需复杂的硬件设备改造，只需一套电动调节阀，可改善炉膛负压波动的幅度，减小了机组非停的几率，甚至大大降低，或者说杜绝了因为炉膛负压不稳定造成的炉膛内爆或者外爆等重大事故的发生。传统对两炉一机火电机组引风机RB的发生只能借助于机组协调控制***快速响应机组负荷的快速变化。而本公开在两炉一机火电机组发生引风机RB时，能够通过实质性的手段改善事故锅炉通风动力缺失的实际情况，同时增加了两炉一机火电机组引风机RB工况的目标负荷，改善了协调控制***完成两炉一机火电机组的引风机RB过程，并且改变了两炉一机火电机组过去只能借助于控制手段或者是人为干预来完成两炉一机火电机组引风机RB过程的历史。本公开选用另一台锅炉引风***补偿机组缺失的通风动力是考虑到两台锅炉引风***一致，工艺简单容易实现。Compared with the prior art, the present disclosure has at least the following beneficial effects: when any one of the first induced draft fan, the second induced draft fan, the third induced draft fan and the fourth induced draft fan fails, the two furnaces and one thermal power plant When the RB of the induced draft fan of the unit is triggered, the remaining three induced draft fans are controlled to work normally. The opening of the valve is adjusted so that the boiler furnace pressure corresponding to the failed induced draft fan is within a safe fluctuation range, so that the first boiler and the second boiler tend to a stable state. In the RB process of the induced draft fan of the two furnaces and one thermal power unit, the disclosure improves the target value of the load command of the unit, improves the rate of decline of the load command of the two furnaces and one machine, and shortens the process time of the induced draft fan RB of the two furnaces and one thermal power unit. Thereby the process of withdrawing the solid fuel of the unit from the furnace is delayed. When the induced draft fan RB occurs in the thermal power unit with two furnaces and one machine, the load of the unit does not need to drop rapidly, and all auxiliary machines of the unit do not need to cooperate with the rapid decrease of the load of the unit. The main parameters of the unit are furnace negative pressure, main fuel volume, main steam pressure, main Steam temperature, main feed water flow, etc. do not need to fluctuate greatly, which will bring unexpected losses to the unit. With the help of the present disclosure, when the induced draft fan RB of the thermal power unit with two boilers and one machine occurs, the operator only needs to calmly wait for the end of the induced draft fan RB process, and the working condition of the unit returns to stability. The disclosure minimizes the probability of equipment damage in the process of the induced draft fan RB of the two furnaces and one thermal power unit of the power generation enterprise, and reduces the number of unplanned shutdowns of the unit caused by the induced draft fan RB. Indirectly created economic benefits for power generation enterprises. On the basis of the hardware structure of the existing thermal power plant system, there is no need for complex hardware equipment modification, only a set of electric control valves, which can improve the range of negative pressure fluctuations in the furnace, reduce the probability of non-stop of the unit, or even greatly reduce, or The occurrence of major accidents such as furnace implosion or external explosion caused by the unstable negative pressure of the furnace is eliminated. Traditionally, the occurrence of induced draft fan RB of two furnaces and one thermal power unit can only be quickly responded to the rapid change of unit load by means of the unit coordination control system. However, when the induced draft fan RB occurs in the two boilers and one thermal power unit, the present disclosure can improve the actual situation of the lack of ventilation power of the accidental boiler through substantial means, and at the same time increase the target load of the induced draft fan RB working condition of the two furnaces and one thermal power unit, Improved the coordinated control system to complete the induced draft fan RB process of two furnaces and one thermal power unit, and changed the process of two furnaces and one thermal power unit to complete the induced draft fan RB process of two furnaces and one thermal power unit in the past only by means of control means or human intervention History. This disclosure chooses another boiler induction system to compensate for the lack of ventilation power of the unit because the two boilers have the same induction system, and the process is simple and easy to implement.

为使本公开的上述目的、特征和优点能更明显易懂，下文特举较佳实施例，并配合所附附图，作详细说明如下。In order to make the above-mentioned objects, features and advantages of the present disclosure more comprehensible, preferred embodiments will be described in detail below together with the accompanying drawings.

附图说明Description of drawings

为了更清楚地说明本公开具体实施方式中的技术方案，下面将对具体实施方式描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图是本公开的一些实施方式，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。In order to more clearly illustrate the technical solutions in the specific embodiments of the present disclosure, the following will briefly introduce the drawings that need to be used in the description of the specific embodiments. Obviously, the drawings in the following description are some embodiments of the present disclosure , for those skilled in the art, other drawings can also be obtained according to these drawings on the premise of not paying creative work.

图1为本公开一种改善两炉一机火电机组引风机RB工况的***示意图。FIG. 1 is a schematic diagram of a system for improving the working condition of the induced draft fan RB of a thermal power unit with two furnaces and one machine according to the present disclosure.

图中：1-第一锅炉；2-第一压力变送器；3-第一阀门；4-第一引风机；5-第二阀门；6-第二引风机；7-烟囱；8-PID控制器；9-电动调节阀门；10-第一引风母管；11-第二锅炉；12-第二压力变送器；13-第三阀门；14-第三引风机；15-第四阀门；16-第四引风机；17-第二引风母管；18-连通管。In the figure: 1-the first boiler; 2-the first pressure transmitter; 3-the first valve; 4-the first induced draft fan; 5-the second valve; 6-the second induced draft fan; 7-the chimney; 8- PID controller; 9- electric regulating valve; 10- the first air induction main pipe; 11- the second boiler; 12- the second pressure transmitter; 13- the third valve; 14- the third induced draft fan; 15- the first Four valves; 16-the fourth induced draft fan; 17-the second induced draft main pipe; 18-connecting pipe.

具体实施方式Detailed ways

为使本公开实施例的目的、技术方案和优点更加清楚，下面将结合附图对本公开的技术方案进行清楚、完整地描述，显然，所描述的实施例是本公开一部分实施例，而不是全部的实施例。基于本公开中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本公开保护的范围。In order to make the purpose, technical solutions and advantages of the embodiments of the present disclosure clearer, the technical solutions of the present disclosure will be clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are part of the embodiments of the present disclosure, not all of them. the embodiment. Based on the embodiments in the present disclosure, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present disclosure.

作为本公开的某一具体实施方式，如图1所示，一种改善两炉一机火电机组引风机RB工况的***，包括第一锅炉1、第一引风母管10、第一压力变送器2、第一引风机4、第二引风机6、第二锅炉11、第二引风母管17、第二压力变送器12、第三引风机14、第四引风机16、连通管18、电动调节阀门9和PID控制器8，第一锅炉1的出口与第一引风母管10的一端连通，第一引风母管10的另一端与第一引风机4和第二引风机6的输入端连通。优选的，第一引风机4和第二引风机6的输入端分别设置有第一阀门3和第二阀门5。第二锅炉11的出口与第二引风母管17的一端连通，第二引风母管17的另一端与第三引风机14和第四引风机16的输入端连通。优选的，第三引风机14和第四引风机16的输入端分别设置有第三阀门13和第四阀门15。优选的，第一引风机4、第二引风机6、第三引风机14和第四引风机16的输出端均连接有烟囱7。As a specific embodiment of the present disclosure, as shown in Figure 1, a system for improving the working condition of the induced draft fan RB of a thermal power unit with two furnaces and one machine includes a first boiler 1, a first induced air main pipe 10, a first pressure Transmitter 2, first induced draft fan 4, second induced draft fan 6, second boiler 11, second induced draft main pipe 17, second pressure transmitter 12, third induced draft fan 14, fourth induced draft fan 16, Connecting pipe 18, electric regulating valve 9 and PID controller 8, the outlet of the first boiler 1 communicates with one end of the first induced air main pipe 10, and the other end of the first induced air main pipe 10 communicates with the first induced draft fan 4 and the first induced air main pipe 10. The input ends of the two induced draft fans 6 are connected. Preferably, the input ends of the first induced draft fan 4 and the second induced draft fan 6 are respectively provided with a first valve 3 and a second valve 5 . The outlet of the second boiler 11 communicates with one end of the second induced air main pipe 17 , and the other end of the second induced air main pipe 17 communicates with the input ends of the third induced draft fan 14 and the fourth induced draft fan 16 . Preferably, the input ends of the third induced draft fan 14 and the fourth induced draft fan 16 are respectively provided with a third valve 13 and a fourth valve 15 . Preferably, chimneys 7 are connected to output ends of the first induced draft fan 4 , the second induced draft fan 6 , the third induced draft fan 14 and the fourth induced draft fan 16 .

连通管18的一端与第一引风母管10连通，连通管18的另一端与第二引风母管17连通。优选的，连通管18与第一引风母管10的连接位置靠近第一锅炉1的出口位置，连通管18与第二引风母管17的连接位置靠近第二锅炉11的出口位置。One end of the communication pipe 18 communicates with the first air induction main pipe 10 , and the other end of the communication pipe 18 communicates with the second air induction main pipe 17 . Preferably, the connection position between the communication pipe 18 and the first air induction main pipe 10 is close to the outlet of the first boiler 1 , and the connection position between the communication pipe 18 and the second air induction main pipe 17 is close to the outlet of the second boiler 11 .

电动调节阀门9设置在连通管18上，优选的，电动调节阀门9位于连通管18的中间位置。The electric regulating valve 9 is arranged on the connecting pipe 18 , preferably, the electric regulating valve 9 is located in the middle of the connecting pipe 18 .

第一压力变送器2和第二压力变送器12分别设置在第一锅炉1和第二锅炉11上，第一压力变送器2用于采集第一锅炉1的炉膛压力，第二压力变送器12用于采集第二锅炉11的炉膛压力。The first pressure transmitter 2 and the second pressure transmitter 12 are arranged on the first boiler 1 and the second boiler 11 respectively, the first pressure transmitter 2 is used to collect the furnace pressure of the first boiler 1, and the second pressure The transmitter 12 is used to collect the furnace pressure of the second boiler 11 .

PID控制器8分别与第一压力变送器2、第二压力变送器12和电动调节阀门9连接。PID控制器8用于根据发生故障的引风机对应的锅炉上安装的压力变送器采集到的锅炉炉膛压力，控制调节连通管18上的电动调节阀门9的开度，使得发生故障的引风机对应的锅炉炉膛压力在安全波动范围内，进而使得第一锅炉1和第二锅炉11趋于稳定状态。The PID controller 8 is respectively connected with the first pressure transmitter 2 , the second pressure transmitter 12 and the electric regulating valve 9 . The PID controller 8 is used to control and adjust the opening of the electric regulating valve 9 on the connecting pipe 18 according to the boiler furnace pressure collected by the pressure transmitter installed on the boiler corresponding to the induced draft fan that has failed, so that the induced draft fan that has failed can The corresponding boiler furnace pressure is within the safe fluctuation range, so that the first boiler 1 and the second boiler 11 tend to be in a stable state.

本公开中，PID控制器选择艾默生的ovation***或华能睿渥的HNICS-T316。电动调节阀门选择西博思2SA7321-2CE20-4BB4-Z或上海行力LTCQ012。In this disclosure, the PID controller chooses Emerson's ovation system or Huaneng Ruiwo's HNICS-T316. For the electric control valve, choose Sibosi 2SA7321-2CE20-4BB4-Z or Shanghai Xingli LTCQ012.

本公开一种改善两炉一机火电机组引风机RB工况的方法，利用补偿手段改善两炉一机火电机组引风机RB工况，以第一锅炉1连接的第一引风机4故障跳闸，触发两炉一机火电机组引风机RB，其他三台引风机均正常为例，描述本公开***在两炉一机火电机组引风机RB过程中的作用，具体如下：The present disclosure discloses a method for improving the working condition of the induced draft fan RB of a thermal power unit with two furnaces, using compensation means to improve the working condition of the induced draft fan RB of a thermal power unit with two furnaces, and the first induced draft fan 4 connected to the first boiler 1 fails to trip. Trigger the induced draft fan RB of two furnaces and one thermal power unit, and take the other three induced draft fans as an example to describe the function of the disclosed system in the process of the induced draft fan RB of two furnaces and one thermal power unit, as follows:

在第一引风机4故障跳闸，两炉一机机组引风机RB触发时，第二锅炉11不需要同时跳闸一台引风机，不会与第一锅炉1一样触发引风机RB工况，在第一引风机4跳闸后，第一引风机4输入端的第一阀门3关闭的同时，给第一引风母管10和第二引风母管17之间的连通管18上的电动调节阀9一定开度(开度与引风机RB发生前的机组负荷相关，负荷越大，开度指令越大)，并且将两台锅炉剩余的三台引风机出力调至最大(RB发生前的机组负荷大于75％的额定负荷时，三台引风机需要将出力调至最大；当RB发生前机组负荷小于75％的额定负荷时，三台引风机出力值根据RB发生前的负荷而定，负荷越大，三台引风机的出力越大)，PID控制器8根据此时第一锅炉1上安装的第一压力变送器2采集的锅炉炉膛压力，通过开大关小两台锅炉引风母管之间的电动调节阀门9，辅助第一引风机6自动调节第一锅炉1的炉膛负压，此时第二锅炉11的两台引风机继续维持第二锅炉11的炉膛负压波动在安全范围之内。第二锅炉两台引风机通过两台锅炉引风母管之间的连通管18尽量补充因为第一引风机4跳闸，而使第一锅炉损失的风烟通流动力；待机组的引风机RB工况慢慢趋于稳定状态后，三台引风机再根据机组的实际情况，以一定速率慢慢关小至额定负荷运行，在此过程中，两台锅炉间PID控制器8始终辅助第一引风机6，确保第一锅炉炉膛负压波动在机组安全运行允许的范围之内。在本公开的改善方法下，两炉一机引风机RB触发后，整个机组的引风***可以看作是一个整体，在失去一台引风机出力的情况下，整个机组的炉膛通风动力有剩余的三台引风机提供，换句话说，就是整个机组仍然保持着75％的炉膛通风能力，所以两炉一机火电机组的引风机RB目标负荷完全可以优化为75％额定负荷。在两炉一机火电机组引风机RB工况稳定后，机组运行人员有两个选择：一，机组继续在75％额定负荷状态下正常运行；二，运行人员以机组正常运行的负荷下降速率，安全地降低机组负荷至50％，直至另一台非故障锅炉的引风机安全停止。在此过程中PID控制器8始终通过两台锅炉引风机母管间连通管上的电动调节阀门9维持第一锅炉炉膛负压在机组安全运行允许的范围之内波动，直至非故障锅炉安全停止一台引风机，此时两台锅炉引风机***出力慢慢平衡后，两台锅炉引风母管间的连通管上的电动调节阀门9的开度也慢慢关小直至关闭状态，此时PID控制器8也停止工作，表征本公开成功帮助两炉一机火电机组完成引风机RB工况。如果是其他三台引风机跳闸引发的两炉一机火电机组引风机RB，其过程与以上引风机RB过程相同。When the first induced draft fan 4 fails and trips, and the induced draft fan RB of two boilers and one unit is triggered, the second boiler 11 does not need to trip one induced draft fan at the same time, and will not trigger the induced draft fan RB working condition like the first boiler 1. After an induced draft fan 4 trips, while the first valve 3 at the input end of the first induced draft fan 4 is closed, the electric regulating valve 9 on the communication pipe 18 between the first induced draft main pipe 10 and the second induced air main pipe 17 is supplied. A certain opening degree (the opening degree is related to the load of the unit before RB occurs, the greater the load, the greater the opening degree command), and adjust the output of the remaining three induced draft fans of the two boilers to the maximum (the unit load before RB occurs When the load is greater than 75% of the rated load, the output of the three induced draft fans needs to be adjusted to the maximum; when the load of the unit before the RB occurs is less than 75% of the rated load, the output value of the three induced draft fans is determined according to the load before the RB occurs. The greater the output of the three induced draft fans), the PID controller 8 is based on the boiler furnace pressure collected by the first pressure transmitter 2 installed on the first boiler 1 at this time, by opening and closing the two boilers. The electric regulating valve 9 between the pipes assists the first induced draft fan 6 to automatically adjust the furnace negative pressure of the first boiler 1. At this time, the two induced draft fans of the second boiler 11 continue to maintain the fluctuation of the furnace negative pressure of the second boiler 11 at a safe level. within range. The two induced draft fans of the second boiler pass through the connecting pipe 18 between the main ducts of the two boilers to supplement the air and smoke circulation power lost by the first boiler due to the trip of the first induced draft fan 4; the induced draft fan RB of the standby unit After the working condition gradually tends to a stable state, the three induced draft fans are slowly turned off at a certain rate to run at the rated load according to the actual situation of the unit. During this process, the PID controller 8 between the two boilers always assists the first The induced draft fan 6 ensures that the negative pressure fluctuation of the furnace of the first boiler is within the allowable range for the safe operation of the unit. Under the improvement method of the present disclosure, after two furnaces and one induced draft fan RB are triggered, the induced draft system of the entire unit can be regarded as a whole, and in the case of losing the output of one induced draft fan, the furnace ventilation power of the entire unit has a surplus In other words, the entire unit still maintains 75% of the furnace ventilation capacity, so the RB target load of the induced draft fan for the thermal power unit with two furnaces and one machine can be completely optimized to 75% of the rated load. After the working condition of the induced draft fan RB of the thermal power unit with two furnaces and one machine is stable, the unit operators have two options: first, the unit continues to operate normally at 75% of the rated load; Safely reduce unit load to 50% until the ID fan of the other non-faulty boiler is safely stopped. During this process, the PID controller 8 always maintains the negative pressure of the first boiler furnace fluctuating within the allowable range for the safe operation of the unit through the electric regulating valve 9 on the connecting pipe between the main pipes of the two boiler induced draft fans, until the non-faulty boiler stops safely. One induced draft fan. At this time, after the output of the induced draft fan system of the two boilers is gradually balanced, the opening of the electric regulating valve 9 on the connecting pipe between the induced air main pipes of the two boilers is also slowly closed until it is closed. At this time The PID controller 8 also stops working, which indicates that the present disclosure successfully helps two furnaces and one thermal power unit to complete the RB working condition of the induced draft fan. If it is the induced draft fan RB of the thermal power unit with two furnaces and one machine caused by the tripping of the other three induced draft fans, the process is the same as the above induced draft fan RB process.

实施例Example

如图1所示，以第一引风机4故障跳闸，触发两炉一机机组引风机RB，RB触发前机组运行在100％额定负荷，其他三台引风机均正常为例，描述此补压***在两炉一机火电机组引风机RB过程中的作用。As shown in Figure 1, taking the first induced draft fan 4 fault tripping, triggering the induced draft fan RB of the two boilers and one machine unit, the unit is running at 100% rated load before RB is triggered, and the other three induced draft fans are normal. The role of the system in the process of induced draft fan RB of two furnaces and one thermal power unit.

在第一引风机4故障跳闸，两炉一机机组引风机RB触发时，第二锅炉11不需要同时跳闸一台引风机，不会与第一锅炉1一样触发引风机RB工况，在第一引风机4跳闸后，第一引风机4输入端的第一阀门3关闭的同时，给第一引风母管10和第二引风母管17之间的连通管18上的电动调节阀9直接开至80％(预留一定的调节手段)，并且将两台锅炉剩余的三台引风机调至最大出力(一般的引风机选型，最大出力都大于50％额定负荷)，此刻PID控制器8根据此时第一锅炉1上安装的第一压力变送器2采集的锅炉炉膛负压的波动值，通过两台锅炉之间的电动调节阀门9，辅助第二引风机6自动调节第一锅炉1的炉膛负压波动在-2000Pa至2000Pa之间，尽量补充因为第一引风机4跳闸，而使第一锅炉损失的通风动力；待两台锅炉参数慢慢趋于稳定状态后，三台引风机再根据机组的实际情况，以1％/min慢慢关小至额定负荷运行，在此过程中，PID控制器8始终维持第一锅炉炉膛负压在-2000Pa至2000Pa之间。在本公开的改善方法下，两炉一机引风机RB触发后，整个机组的引风***可以看作是一个整体，在失去一台引风机出力的情况下，整个机组的炉膛通风动力有剩余的三台引风机提供，换句话说，就是整个机组仍然保持着75％的炉膛通风能力，所以两炉一机火电机组的引风机RB目标负荷完全可以优化为75％额定负荷。在两炉一机火电机组引风机RB工况稳定后，机组运行人员有两个选择：一，机组继续在75％额定负荷状态下正常运行；二，运行人员以每分钟下降1％额定负荷的速率，安全地降低机组负荷至50％，直至第二锅炉的引风机安全停止。在此过程中PID控制器8始终通过两台锅炉引风母管间连通管上的电动调节阀门9维持第一锅炉炉膛负压在-2000Pa至2000Pa之间，直至第二锅炉安全停止一台引风机，此时两台锅炉引风机***出力慢慢平衡后，两台锅炉引风母管间的连通管上的电动调节阀门9的开度也慢慢关小直至关闭状态，此时PID控制器也停止工作，表征本公开改善方法成功帮助两炉一机火电机组完成引风机RB工况。When the first induced draft fan 4 fails and trips, and the induced draft fan RB of two boilers and one unit is triggered, the second boiler 11 does not need to trip one induced draft fan at the same time, and will not trigger the induced draft fan RB working condition like the first boiler 1. After an induced draft fan 4 trips, while the first valve 3 at the input end of the first induced draft fan 4 is closed, the electric regulating valve 9 on the communication pipe 18 between the first induced draft main pipe 10 and the second induced air main pipe 17 is supplied. Directly open to 80% (reserve a certain adjustment method), and adjust the remaining three induced draft fans of the two boilers to the maximum output (general induced draft fan selection, the maximum output is greater than 50% of the rated load), at this time PID control According to the fluctuation value of the boiler furnace negative pressure collected by the first pressure transmitter 2 installed on the first boiler 1 at this time, the device 8 assists the second induced draft fan 6 to automatically adjust the first pressure through the electric regulating valve 9 between the two boilers. The furnace negative pressure of boiler 1 fluctuates between -2000Pa and 2000Pa, try to supplement the ventilation power lost by the first boiler due to the tripping of the first induced draft fan 4; after the parameters of the two boilers gradually tend to a stable state, three According to the actual situation of the unit, the induced draft fan is slowly turned off at 1%/min to run at the rated load. During this process, the PID controller 8 always maintains the negative pressure of the first boiler furnace between -2000Pa and 2000Pa. Under the improvement method of the present disclosure, after two furnaces and one induced draft fan RB are triggered, the induced draft system of the entire unit can be regarded as a whole, and in the case of losing the output of one induced draft fan, the furnace ventilation power of the entire unit has a surplus In other words, the entire unit still maintains 75% of the furnace ventilation capacity, so the RB target load of the induced draft fan for the thermal power unit with two furnaces and one machine can be completely optimized to 75% of the rated load. After the working condition of the induced draft fan RB of the two furnaces and one thermal power unit is stable, the unit operators have two options: first, the unit continues to operate normally at 75% of the rated load; Speed, safely reduce the unit load to 50%, until the induced draft fan of the second boiler is safely stopped. During this process, the PID controller 8 always maintains the furnace negative pressure of the first boiler between -2000Pa and 2000Pa through the electric regulating valve 9 on the connecting pipe between the two boiler induction main pipes, until the second boiler safely stops one induction pipe. Fan, at this time, after the output of the induced draft fan system of the two boilers is gradually balanced, the opening of the electric regulating valve 9 on the connecting pipe between the induced draft main pipes of the two boilers is also slowly closed until it is closed. At this time, the PID controller It also stopped working, indicating that the improved method of the present disclosure successfully helped two furnaces and one thermal power unit to complete the RB working condition of the induced draft fan.

最后应说明的是：以上所述实施例，仅为本公开的具体实施方式，用以说明本公开的技术方案，而非对其限制，本公开的保护范围并不局限于此，尽管参照前述实施例对本公开进行了详细的说明，本领域的普通技术人员应当理解：任何熟悉本技术领域的技术人员在本公开揭露的技术范围内，其依然可以对前述实施例所记载的技术方案进行修改或可轻易想到变化，或者对其中部分技术特征进行等同替换；而这些修改、变化或者替换，并不使相应技术方案的本质脱离本公开实施例技术方案的精神和范围，都应涵盖在本公开的保护范围之内。因此，本公开的保护范围应所述以权利要求的保护范围为准。Finally, it should be noted that: the above-mentioned embodiments are only specific implementations of the present disclosure, and are used to illustrate the technical solutions of the present disclosure, rather than limit them, and the protection scope of the present disclosure is not limited thereto, although referring to the aforementioned The embodiments have described the present disclosure in detail, and those skilled in the art should understand that any person familiar with the technical field can still modify the technical solutions described in the foregoing embodiments within the technical scope disclosed in the present disclosure Changes can be easily imagined, or equivalent replacements can be made to some of the technical features; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present disclosure, and should be included in this disclosure. within the scope of protection. Therefore, the protection scope of the present disclosure should be defined by the protection scope of the claims.

Claims

一种改善两炉一机火电机组引风机RB工况的***，其特征在于，包括第一锅炉(1)、第一引风母管(10)、第一压力变送器(2)、第一引风机(4)、第二引风机(6)、第二锅炉(11)、第二引风母管(17)、第二压力变送器(12)、第三引风机(14)、第四引风机(16)、连通管(18)、电动调节阀门(9)和PID控制器(8)，所述第一锅炉(1)的出口与所述第一引风母管(10)的一端连通，所述第一引风母管(10)的另一端与所述第一引风机(4)和第二引风机(6)的输入端连通，所述第二锅炉(11)的出口与所述第二引风母管(17)的一端连通，所述第二引风母管(17)的另一端与所述第三引风机(14)和所述第四引风机(16)的输入端连通，所述连通管(18)的一端与所述第一引风母管(10)连通，所述连通管(18)的另一端与所述第二引风母管(17)连通，所述电动调节阀门(9)设置在所述连通管(18)上，所述第一压力变送器(2)和所述第二压力变送器(12)分别设置在所述第一锅炉(1)和所述第二锅炉(11)上，所述PID控制器(8)分别与所述第一压力变送器(2)、所述第二压力变送器(12)和所述电动调节阀门(9)连接。A system for improving the working condition of the induced draft fan RB of a thermal power unit with two furnaces, characterized in that it includes a first boiler (1), a first induced air main pipe (10), a first pressure transmitter (2), a second One induced draft fan (4), the second induced draft fan (6), the second boiler (11), the second induced draft main pipe (17), the second pressure transmitter (12), the third induced draft fan (14), The fourth induced draft fan (16), connecting pipe (18), electric regulating valve (9) and PID controller (8), the outlet of the first boiler (1) and the first induced air main pipe (10) One end of the first induced draft main pipe (10) communicates with the input ends of the first induced draft fan (4) and the second induced draft fan (6), and the second boiler (11) The outlet communicates with one end of the second induced-air main pipe (17), and the other end of the second induced-air main pipe (17) is connected with the third induced-air fan (14) and the fourth induced-air fan (16). ), one end of the communication pipe (18) communicates with the first air induction main pipe (10), and the other end of the communication pipe (18) communicates with the second air induction main pipe (17 ), the electric regulating valve (9) is set on the connecting pipe (18), and the first pressure transmitter (2) and the second pressure transmitter (12) are respectively set on the On the first boiler (1) and the second boiler (11), the PID controller (8) is connected with the first pressure transmitter (2) and the second pressure transmitter (12) respectively It is connected with the electric regulating valve (9).
根据权利要求1所述的一种改善两炉一机火电机组引风机RB工况的***，其特征在于，所述电动调节阀门(9)位于所述连通管(18)的中间位置。A system for improving the working condition of induced draft fan RB of two furnaces and one thermal power unit according to claim 1, characterized in that the electric regulating valve (9) is located in the middle of the connecting pipe (18).
根据权利要求1所述的一种改善两炉一机火电机组引风机RB工况的***，其特征在于，所述连通管(18)与所述第一引风母管(10)的连接位置靠近所述第一锅炉(1)的出口位置，所述连通管(18)与所述第二引风母管(17)的连接位置靠近所述第二锅炉(11)的出口位置。A system for improving the working condition of induced draft fan RB of thermal power unit with two furnaces and one engine according to claim 1, characterized in that, the connection position between the connecting pipe (18) and the first induced air main pipe (10) Close to the outlet of the first boiler (1), the connecting position of the communication pipe (18) and the second air induction main pipe (17) is close to the outlet of the second boiler (11).
根据权利要求1所述的一种改善两炉一机火电机组引风机RB工况的***，其特征在于，所述第一引风机(4)和所述第二引风机(6)的输入端分别设置有第一阀门(3)和第二阀门(5)，所述第三引风机(14)和所述第四引风机(16)的输入端分别设置有第三阀门(13)和第四阀门(15)。A system for improving the working condition of the induced draft fan RB of a thermal power unit with two furnaces and one engine according to claim 1, wherein the input ends of the first induced draft fan (4) and the second induced draft fan (6) A first valve (3) and a second valve (5) are respectively provided, and the input ends of the third induced draft fan (14) and the fourth induced draft fan (16) are respectively provided with a third valve (13) and a second Four valves (15).
根据权利要求1所述的一种改善两炉一机火电机组引风机RB工况的***，其特征在于，所述第一引风机(4)、所述第二引风机(6)、所述第三引风机(14)和所述第四引风机(16)的输出端均连接有烟囱(7)。A system for improving the working condition of the induced draft fan RB of a thermal power unit with two furnaces and one machine according to claim 1, characterized in that, the first induced draft fan (4), the second induced draft fan (6), the described Chimneys (7) are connected to output ends of the third induced draft fan (14) and the fourth induced draft fan (16).
根据权利要求1所述的一种改善两炉一机火电机组引风机RB工况的***，其特征在于，所述PID控制器(8)选择ovation***或HNICS-T316。A system for improving the working condition of induced draft fan RB of two furnaces and one thermal power unit according to claim 1, characterized in that the PID controller (8) selects the ovation system or HNICS-T316.
一种改善两炉一机火电机组引风机RB工况的方法，其特征在于，应用如权利要求1至6任一项所述的***，当所述第一引风机(4)、所述第二引风机(6)、所述第三引风机(14)和所述第四引风机(16)中的任意一台引风机发生故障，两炉一机火电机组引风机RB触发时，包括：A method for improving the working condition of the induced draft fan RB of a thermal power unit with two furnaces, characterized in that, the system according to any one of claims 1 to 6 is applied, when the first induced draft fan (4), the second induced draft fan (4) Any one of the second induced draft fan (6), the third induced draft fan (14) and the fourth induced draft fan (16) fails, and when the induced draft fan RB of the two furnaces and one thermal power unit is triggered, it includes:

控制剩余的三台引风机正常工作，所述PID控制器(8)根据发生故障的引风机对应的锅炉上安装的压力变送器采集到的锅炉炉膛压力，控制调节所述连通管(18)上的所述电动调节阀门(9)的开度，使得发生故障的引风机对应的锅炉炉膛压力在安全波动范围内，进而使得所述第一锅炉(1)和所述第二锅炉(11)趋于稳定状态。Control the remaining three induced draft fans to work normally, and the PID controller (8) controls and adjusts the connecting pipe (18) according to the boiler furnace pressure collected by the pressure transmitter installed on the boiler corresponding to the failed induced draft fan The electric adjustment valve (9) on the opening degree makes the boiler furnace pressure corresponding to the failed induced draft fan within the safe fluctuation range, so that the first boiler (1) and the second boiler (11) tends to a stable state.
根据权利要求7所述的一种改善两炉一机火电机组引风机RB工况的方法，其特征在于，两炉一机火电机组引风机RB触发之前，若机组负荷大于75％的额定负荷时，控制剩余的三台引风机将出力调至最大；According to claim 7, a method for improving the working condition of the induced draft fan RB of the thermal power unit with two furnaces, characterized in that, before the induced draft fan RB of the thermal power unit with two furnaces is triggered, if the load of the unit is greater than 75% of the rated load , control the remaining three induced draft fans to adjust the output to the maximum;

待所述第一锅炉(1)和所述第二锅炉(11)趋于稳定状态后，控制剩余的三台引风机以一定速率调至额定负荷运行。After the first boiler (1) and the second boiler (11) tend to be in a stable state, the remaining three induced draft fans are controlled to operate at a rated load at a certain speed.
根据权利要求7所述的一种改善两炉一机火电机组引风机RB工况的方法，其特征在于，所述第一锅炉(1)和所述第二锅炉(11)趋于稳定状态后，继续控制剩余的三台引风机正常工作，使得机组负荷保持75％的额定负荷。A method for improving the working condition of the induced draft fan RB of a thermal power unit with two boilers and one engine according to claim 7, characterized in that, after the first boiler (1) and the second boiler (11) tend to be in a stable state , continue to control the normal operation of the remaining three induced draft fans, so that the unit load remains at 75% of the rated load.
根据权利要求7所述的一种改善两炉一机火电机组引风机RB工况的方法，其特征在于，所述第一锅炉(1)和所述第二锅炉(11)趋于稳定状态后，按照预设的负荷变化率降低机组负荷至50％，直至与发生故障的引风机不连接的锅炉所对应的任意一台引风机安全停止，在降低机组负荷的同时，所述PID控制器(8)根据发生故障的引风机对应的锅炉上安装的压力变送器采集到的锅炉炉膛压力，控制调节所述连通管(18)上的所述电动调节阀门(9)的开度，使得发生故障的引风机对应的锅炉炉膛压力在安全波动范围内，进而使得所述第一锅炉(1)和所述第二锅炉(11)趋于稳定状态。A method for improving the working condition of the induced draft fan RB of a thermal power unit with two boilers and one engine according to claim 7, characterized in that, after the first boiler (1) and the second boiler (11) tend to be in a stable state , reduce the unit load to 50% according to the preset load change rate, until any induced draft fan corresponding to the boiler that is not connected to the failed induced draft fan stops safely, while reducing the unit load, the PID controller ( 8) According to the boiler furnace pressure collected by the pressure transmitter installed on the boiler corresponding to the induced draft fan that has failed, control and adjust the opening of the electric regulating valve (9) on the connecting pipe (18), so that The furnace pressure of the boiler corresponding to the faulty induced draft fan is within the safe fluctuation range, so that the first boiler (1) and the second boiler (11) tend to be in a stable state.