CN216281503U - System for improving RB working condition of blower of thermal power unit with two furnaces - Google Patents

Abstract

The utility model discloses a system for improving RB working conditions of blowers of two-furnace one-thermal power generating unit, wherein output ends of a first blower and a second blower are communicated with one end of a first air supply main pipe, the other end of the first air supply main pipe is communicated with a first boiler, output ends of a third blower and a fourth blower are communicated with one end of a second air supply main pipe, the other end of the second air supply main pipe is communicated with a second boiler, one end of a communicating pipe is communicated with the first air supply main pipe, the other end of the communicating pipe is communicated with the second air supply main pipe, an electric regulating valve is arranged on the communicating pipe, a first pressure transmitter and a second pressure transmitter are respectively arranged on the first air supply main pipe and the second air supply main pipe, and a PID controller is respectively connected with the first pressure transmitter, the second pressure transmitter and the electric regulating valve. The utility model can effectively solve the problem of the blower RB caused by the failure of only one boiler blower of two furnaces and one machine set.

Description

System for improving RB working condition of blower of thermal power unit with two furnaces

Technical Field

The utility model relates to the technical field of automatic control of thermal power stations, in particular to a system for improving RB working conditions of a blower of a thermal power unit with two furnaces and one machine.

Background

The RB function means that the load instruction of the unit and the fuel quantity quickly react under the condition that an auxiliary machine in operation is abnormal and fails, main automatic control systems of the unit are mutually matched, the load of the unit is quickly and stably reduced to the maximum output force actually allowed by the unit, and the continuous safe operation of the unit is ensured. In the existing thermal power generating units, most of the units are provided with two blowers with 50% rated output as air supply systems of the units, when one blower trips due to failure and loses output capacity, the units need to throw 50% of load away at the highest speed that one unit can bear, quit 50% of solid fuel quantity, and quickly recover a stable combustion state. In the thermal power industry, the fault process is called air supply RNUBACK and is commonly called an air supply RB. And two stove a thermal power generating unit forced draught blower RB operating modes have two kinds of situations: firstly, one boiler blower fault tripping triggers a set blower RB, in order to ensure consistent quality of steam before gas valve combination, the boiler with the complete other blower system also has to follow the boiler with the blower system fault, simultaneously has the same speed and ensures the quality of the steam, and the output is reduced to the target load until the load of the whole set is reduced to 50% of the rated load; and secondly, two boilers are respectively provided with one air feeder to trip due to faults, so that the RB working condition of the air feeder of the whole unit is triggered.

In the process of generating the air feeder RB in the two furnaces and one machine set, the load controller of the machine set can automatically and quickly throw off redundant 50% of load; the fuel systems of the two boilers automatically and rapidly reduce the excessive 50% of fuel quantity at similar rates (related to the characteristics of the boilers and aiming to ensure that the steam generated by the two boilers is similar in quality); meanwhile, the reducing speed of the matched fuel quantity reduces 50% of primary air quantity of each boiler; in order to maintain the constant negative pressure of the furnace chambers, the induced draft fans of the two boilers should also rapidly reduce the output by 50%. The air supply system has the main functions of helping the pulverized coal entering the hearth to fully complete the combustion process, releasing all energy of the pulverized coal to be converted into heat energy and being absorbed by the water-cooled wall; and the reduction of the output of the air supply system directly influences the stability of the negative pressure of the hearth. When the air feeder RB occurs, the first change is the negative pressure of the hearth, the negative pressure of the hearth can suddenly drop in a cliff manner along with the reduction of the output of the air supply system, and then along with the emergency action of the negative pressure control system of the hearth, the output of the induced draft fan is quickly reduced to match the sudden reduction of the air supply quantity; however, the output of the induced draft fan cannot be reduced all the time to respond to the reduction of the air output, and the temporary instant climbing of the negative pressure of the hearth caused by the heat released by the combustion of the excess fuel which is not withdrawn in time for sudden load reduction of the boiler is also considered, so that the process has great challenge to the quick response of an induced draft fan system. The quick response of the induced draft fan is very likely to fail to meet the rapid change of the negative pressure of the hearth, and the over-limit tripping of the unit due to the negative pressure of the hearth is brought as a result.

Secondly, the instability of combustion in the hearth is reflected. When a blower RB occurs, a fuel system rapidly exits from a preselected running grinding set system at a certain speed (the maximum speed is set according to the energy characteristics of a hearth) to adapt to a unit load instruction behind the blower RB, along with the continuous exit of the grinding set system, the fuel entering the hearth is rapidly reduced, the heat released by pulverized coal combustion in the hearth is less and less, however, a boiler induced draft fan reduces the output at the limit speed, the sharply fluctuating hearth negative pressure is kept within a protection value, so that the air flow field in the hearth is extremely unstable, the temperature field in the hearth is prompted to change violently, the running grinding set in the hearth is easily lost in ignition conditions and exits from a running state, and finally, the unit trips due to a hearth fire extinguishing signal.

After the air feeder RB occurs, due to the fact that the output of an air supply system for auxiliary combustion is insufficient, large-area unburned and sufficient coal dust is left in a hearth, however, an extremely unstable aerodynamic field provides opportunities for the coal dust to be left in a tail flue of a boiler, the more coal dust is left in the tail flue which is not fully combusted along with the prolonging of time, the more coal dust is left in the tail flue, the more coal dust reaches a certain degree, the coal dust is detonated in the tail flue instantly, a heat exchange area of the tail flue of the boiler is damaged, and irreparable economic loss is brought to a power generation enterprise.

When the parameter deviation of the steam at the outlet of the two boilers exceeds the allowable value of the unit for maintaining safe operation, and the steam behind the air valve is in the process of fusion, the steam pipeline can generate severe vibration, the steam pipeline can be seriously broken, high-temperature and high-pressure steam is exposed, and great damage to personnel and equipment is caused. When the two boilers and one machine set generate the air feeder RB, the two boilers keep the quality of steam in front of the air valve within an allowable range on the premise of ensuring the safety of the machine set, so that the RB working condition of the machine set is ensured to be completed smoothly. However, the two boilers are reduced to the target load of the RB working condition at consistent limit speed, and the limit test is performed on all auxiliary machines of the two boilers and the professional skill level of operators of the boilers. When any link is out of operation, the unit can be shut down unplanned, even more, equipment damage or personnel damage can occur, and unimaginable personnel or economic loss is brought to a power generation enterprise.

The existing RB mode of the blower of the two-furnace one-machine unit has the following problems:

firstly, all auxiliary machines of the whole unit rapidly reduce 50% of load at the same time, and the workload and the mental stress brought to operators are obvious; the quick response of the equipment is a great test for the quality of the equipment material, and the hidden damage brought to the equipment by the quick variable load for many times is not negligible.

Secondly, the blower RB occurs, the secondary air volume for assisting pulverized coal combustion in the hearth is reduced, large-area unburned and sufficient pulverized coal is retained in the hearth, however, an extremely unstable aerodynamic field provides opportunities for the pulverized coal to be retained in a tail flue of the boiler, and as time is prolonged, the more the pulverized coal which is not sufficiently combusted in the tail flue is accumulated, after the pulverized coal reaches a certain degree, the pulverized coal can detonate instantaneously in the tail flue, the heat exchange area of the tail flue of the boiler is damaged, and irreparable economic loss is brought to power generation enterprises.

Thirdly, the negative pressure fluctuation of the hearth caused by the air feeder RB is severe, even can reach the limit protection value of the boiler instantly, even exceeds the limit value, and the unplanned shutdown of the unit is caused; although the time for exceeding the limit protection value is not long, the boiler is frequently operated in such an overrun way, and the material life of the boiler is greatly tested.

Finally, when the air feeder RB occurs, the loads of the two boilers are simultaneously and violently changed to maintain the consistency of the quality of the steam in front of the air valve for the unit, the service capacity of operators is greatly challenged, the working strength brought to the operators is obvious, the operators are careless, the light operators cause unplanned shutdown of the unit, the heavy operators seriously damage the unit equipment, and the power generation enterprises bring immeasurable economic loss.

SUMMERY OF THE UTILITY MODEL

Aiming at the problems in the prior art, the utility model provides a system for improving the RB working condition of the blower of the two-boiler one-machine thermal power unit, which can effectively solve the RB problem of the blower caused by the failure of only one boiler blower of the two-boiler one-machine thermal power unit, and has important significance for improving the RB stability of the blower of the two-boiler one-machine thermal power unit, prolonging the service life of key equipment of a boiler, reducing the times of unplanned shutdown of main auxiliary equipment of the unit caused by the RB blower and reducing the maintenance cost.

In order to solve the technical problems, the utility model is realized by the following technical scheme:

a system for improving RB working conditions of blowers of a two-furnace one-thermal power unit comprises a first blower, a second blower, a first air supply main pipe, a first pressure transmitter, a first boiler, a third blower, a fourth blower, a second air supply main pipe, a second pressure transmitter, a second boiler, a communication pipe, an electric regulating valve and a PID controller, wherein output ends of the first blower and the second blower are communicated with one end of the first air supply main pipe, the other end of the first air supply main pipe is communicated with the first boiler, the output ends of the third blower and the fourth blower are communicated with one end of the second air supply main pipe, the other end of the second air supply main pipe is communicated with the second boiler, one end of the communication pipe is communicated with the first air supply main pipe, and the other end of the communication pipe is communicated with the second air supply main pipe, the electric adjusting valve is arranged on the communicating pipe, the first pressure transmitter and the second pressure transmitter are respectively arranged on the first air supply main pipe and the second air supply main pipe, and the PID controller is respectively connected with the first pressure transmitter, the second pressure transmitter and the electric adjusting valve.

Further, the electric adjusting valve is located in the middle of the communicating pipe.

Further, the connection position of the communication pipe and the first air supply main pipe is close to the output ends of the first air blower and the second air blower, and the connection position of the communication pipe and the second air supply main pipe is close to the output ends of the third air blower and the fourth air blower.

Furthermore, the first pressure transmitter is close to the connection position of the communicating pipe and the first air supply main pipe, and the second pressure transmitter is close to the connection position of the communicating pipe and the second air supply main pipe.

Further, the output ends of the first air blower and the second air blower are respectively provided with a first valve and a second valve, and the output ends of the third air blower and the fourth air blower are respectively provided with a third valve and a fourth valve.

The utility model provides a method for improving two stove a quick-witted thermal power generating unit forced draught blower RB operating mode, uses the system, when arbitrary forced draught blower in first forced draught blower, second forced draught blower, third forced draught blower and the fourth forced draught blower breaks down, two stove a quick-witted thermal power generating unit forced draught blower RB triggers, includes:

and controlling the remaining three air blowers to normally work, wherein the PID controller is used for controlling and adjusting the opening degree of the electric adjusting valve on the communicating pipe according to the pressure of the first air supply main pipe collected by the first pressure transmitter and the pressure of the second air supply main pipe collected by the second pressure transmitter, so that the pressure of the first air supply main pipe and the pressure of the second air supply main pipe are in a balanced state, and further the first boiler and the second boiler tend to be in a stable state.

Further, before the blowers RB of the two furnaces and one thermal power generating unit are triggered, if the load of the unit is greater than 75% of the rated load, the remaining three blowers are controlled to adjust the output force to the maximum;

and after the first boiler and the second boiler tend to be in a stable state, controlling the rest three blowers to be adjusted to the rated load for operation at a certain speed.

Further, after the first boiler and the second boiler tend to be in a stable state, the remaining three blowers are continuously controlled to normally work, so that the load of the unit keeps 75% of the rated load.

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 a preset load change rate until any blower corresponding to the boiler which is not connected with the blower in a fault safely stops, and the PID controller controls and adjusts the opening of the electric adjusting valve on the communicating pipe according to the pressure of the first air supply main pipe collected by the first pressure transmitter and the pressure of the second air supply main pipe collected by the second pressure transmitter while reducing the load of the unit, so that the pressure of the first air supply main pipe and the pressure of the second air supply main pipe are in a balanced state.

Compared with the prior art, the utility model has at least the following beneficial effects: when any one of the first air feeder, the second air feeder, the third air feeder and the fourth air feeder breaks down, when the air feeders RB of the two-furnace thermal power generating unit is triggered, the remaining three air feeders are controlled to normally work, the PID controller controls and adjusts the opening of an electric adjusting valve on a communicating pipe according to the pressure of a first air feeding main pipe collected by the first pressure transmitter and the pressure of a second air feeding main pipe collected by the second pressure transmitter, so that the pressure of the first air feeding main pipe and the pressure of the second air feeding main pipe are in a balanced state, and the first boiler and the second boiler tend to be in a stable state. The method reduces the target value of the unit load instruction in the RB process of the blower of the thermal power unit with one boiler, improves the descending rate of the two boilers and one blower load instruction, and shortens the RB process time of the blower of the thermal power unit with one boiler, thereby delaying the process of withdrawing the solid fuel of the unit from the hearth. When a blower RB occurs again for a thermal power generating unit with two furnaces, the load of the unit does not need to be reduced rapidly, all auxiliary machines of the unit do not need to be matched with the load of the unit to be reduced rapidly, and main parameters of the unit, such as negative pressure of a hearth, main fuel quantity, main steam pressure, main steam temperature, main water supply flow and the like, do not need to fluctuate greatly any more, so that unexpected loss of the unit is avoided. With the help of the utility model, when the blower RB of the two-furnace one-thermal power generating unit occurs, an operator only needs to wait for the blower RB to finish the process leisurely, and the working condition of the unit is recovered to be stable. The utility model furthest reduces the equipment damage probability of a power generation enterprise in the process of the blower RB of the two-furnace one-thermal power generating unit, reduces the times of unplanned shutdown of the unit caused by the blower RB, and indirectly creates economic benefit for the power generation enterprise. On the basis of the existing hardware structure of the thermal power station system, complicated hardware equipment transformation is not needed, only one set of electric control valve is needed, the fluctuation range of the negative pressure of the hearth can be improved, the non-stop probability of a unit is reduced, even the large possibility is greatly reduced, or the occurrence of serious accidents such as hearth implosion or outburst caused by unstable negative pressure of the hearth is avoided. The traditional generation of a blower RB of a thermal power generating unit with two furnaces can only rapidly respond to the rapid change of the load of the unit by means of a unit coordination control system. When the two-furnace one-machine thermal power generating unit generates the air feeder RB, the actual condition of air supply loss can be improved through a substantial means, the target load of the working condition of the air feeder RB of the two-furnace one-machine thermal power generating unit is reduced, the air feeder RB process of the two-furnace one-machine thermal power generating unit completed by a coordinated control system is improved, and the history that the air feeder RB process of the two-furnace one-machine thermal power generating unit can be completed only by means of control means or manual intervention in the past is changed. The utility model selects the other boiler air supply system to compensate the air supply quantity lacking in the unit, and considers that the two boiler air supply systems are consistent, and the process is simple and easy to realize.

In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a system for improving the working condition of a blower RB of a two-furnace one-thermal power generating unit according to the present invention.

In the figure: 1-a first blower; 2-a second blower; 3-a first valve; 4-a second valve; 5-a first pressure transmitter; 6-a first boiler; 9-an electric regulating valve; 10-a PID controller; 11-a third blower; 12-a fourth blower; 13-a third valve; 14-a fourth valve; 15-a second pressure transmitter; 16-a second boiler; 17-a first air supply main pipe; 18-a second air supply main pipe; 19-communicating tube.

Detailed Description

To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 1, a system for improving the operating condition of a blower RB of a two-furnace thermal power generating unit according to an embodiment of the present invention includes a first blower 1, a second blower 2, a first main blower duct 17, a first pressure transmitter 5, a first boiler 6, a third blower 11, a fourth blower 12, a second main blower duct 18, a second pressure transmitter 15, a second boiler 16, a communication pipe 19, an electric control valve 9, and a PID controller 10, wherein output ends of the first blower 1 and the second blower 2 are both communicated with one end of the first main blower duct 17, and the other end of the first main blower duct 17 is communicated with the first boiler 6. Preferably, the output ends of the first blower 1 and the second blower 2 are respectively provided with a first valve 3 and a second valve 4. The output ends of the third blower 11 and the fourth blower 12 are both communicated with one end of a second main blowing pipe 18, and the other end of the second main blowing pipe 18 is communicated with a second boiler 16. Preferably, the output ends of the third blower 11 and the fourth blower 12 are provided with a third valve 13 and a fourth valve 14, respectively.

One end of the communication pipe 19 is communicated with the first main blowing pipe 17, and the other end of the communication pipe 19 is communicated with the second main blowing pipe 18. Preferably, the connection position of the communication pipe 19 and the first blowing main pipe 17 is close to the output ends of the first blower 1 and the second blower 2, and the connection position of the communication pipe 19 and the second blowing main pipe 18 is close to the output ends of the third blower 11 and the fourth blower 12.

The electric control valve 9 is provided on the communication pipe 19. Preferably, the electrically operated regulating valve 9 is located at an intermediate position of the communicating tube 19.

First pressure transmitter 5 and second pressure transmitter 15 set up respectively on first main pipe 17 of supplying air and the main pipe 18 of second supplying air, and first pressure transmitter 5 is used for gathering the pressure of the main pipe 17 of first supplying air, and second pressure transmitter 15 is used for gathering the pressure of the main pipe 18 of second supplying air. Preferably, the first pressure transmitter 5 is close to the connection position of the communicating pipe 19 and the first air supply main pipe 17, and the second pressure transmitter 15 is close to the connection position of the communicating pipe 19 and the second air supply main pipe 18.

The PID controller 10 is connected to the first pressure transmitter 5, the second pressure transmitter 15 and the electrically operated regulator valve 9, respectively. The PID controller 10 is configured to control and adjust an opening degree of the electric control valve 9 on the communicating pipe 19 according to a difference between a pressure of the first air supply main pipe 17 and a pressure of the second air supply main pipe 18 collected by the first pressure transmitter 5 and the second pressure transmitter 15, so that the pressure of the first air supply main pipe 17 and the pressure of the second air supply main pipe 18 are in a balanced state, and further the first boiler 6 and the second boiler 16 tend to a stable state.

In the present invention, the PID controller selects either the Emerson over system or the Wal Wo HNICS-T316. The electric regulating valve 9 selects Sibocicly 2SA7321-2CE20-4BB4-Z or Shanghai traveling force LTCQ 012.

The utility model discloses a method for improving RB working conditions of blowers RB of two-boiler one-machine thermal power unit, which is characterized in that the RB working conditions of the blowers of the two-boiler one-machine thermal power unit are improved by a compensation means, the failure tripping of a first blower 1 connected with a first boiler 6 is taken as an example to trigger the RBs of the blowers of the two-boiler one-machine thermal power unit, and other three blowers are normal, so that the function of the system in the RB process of the blowers of the two-boiler one-machine thermal power unit is described, and the method specifically comprises the following steps:

when the first blower 1 is tripped due to faults and the blower RB of the two-boiler thermal power unit is triggered, the second boiler 16 does not need to trip one blower simultaneously and does not trigger the working condition of the blower RB as the first boiler 6 does. After the first blower 1 trips, the first valve 3 at the output end of the first blower 1 is closed, meanwhile, the electric control valve 9 on a communication pipe 19 between a first main blower 17 and a second main blower 18 is given a certain opening degree (the opening degree is related to the unit load before the occurrence of the blower RB, the larger the load is, the larger the opening degree instruction is), the output power of the three remaining blowers of the two boilers is adjusted to the maximum (when the unit load before the occurrence of the RB is greater than 75% of the rated load, the three blowers need to adjust the output power to the maximum; when the unit load before the occurrence of the RB is less than 75% of the rated load, the output power values of the three blowers are determined according to the unit load before the occurrence of the RB, the larger the output power of the three blowers is, the PID controller 10 automatically adjusts the electric control valve 9 on the communication pipe 19 according to the difference value of the pressures collected by the first pressure transmitter 5 and the second pressure transmitter 15, the pressure of the air supply main pipes of the two boilers is in a balanced state (determined according to the quality deviation of steam at the outlets of the two boilers and in front of an air valve), and the air supply quantity lost by the first boiler 6 due to the tripping of the first air feeder 1 is supplemented as much as possible; after the two boilers slowly approach to the stable state, the three air blowers are slowly turned down to the rated load operation at a certain speed according to the actual conditions of the unit, and in the process, the PID controller 10 always maintains the pressure of the air supply main pipes of the two boilers (namely the pressure of the first air supply main pipe 17 and the pressure of the second air supply main pipe 18) within the deviation range allowed by the safe operation of the unit. Under the improvement method of the utility model, when the two-furnace one-machine blower RB is triggered, the air supply system of the whole unit can be regarded as a whole, under the condition that the output of one blower is lost, the air supply system of the whole unit is provided by the remaining three blowers, in other words, the whole unit still maintains 75% of air supply capacity, so the target load of the blower RB of the two-furnace one-machine thermal power unit can be completely optimized to 75% of rated load, the target load of the unit RB is 50% of rated load, the optimization is 75% of rated load, the load change of the whole unit is reduced from 50% to 25% of rated load, and the load change rate and the process time of the blower RB in the RB process of the two-furnace one-machine thermal power unit are greatly improved.

After waiting for two boilers slowly to tend to steady state, the unit operation personnel have two choices: first, the unit continues to operate in this state (unit load is approximately 75% of rated load); second, the operator reduces the unit load to 50% at a normal load change rate until any blower connected to the other boiler (i.e., the second boiler 16) is safely stopped. In the process, the PID controller 10 always controls the opening of the electric regulating valve 9 on the regulating communicating pipe 19 to maintain the pressure of the two boiler air supply main pipes in a balanced state until the other boiler (the second boiler 16) safely stops one air supply, and at the moment, the electric regulating valve 9 on the regulating communicating pipe 19 is controlled to be in a closed state, and the PID controller 10 also stops working. The improvement method successfully helps two furnaces and one thermal power generating unit to complete the RB working condition of the air feeder. If the two furnaces and one thermal power unit blower RB caused by the tripping of other three blowers is adopted, the process is the same as the process of the blower RB.

Examples

As shown in fig. 1, the function of the pressure compensation system in the process of the two-boiler one-thermal power unit blower RB is described by taking an example that the first blower 1 connected to the first boiler 6 trips in a fault to trigger the two-boiler one-thermal power unit blower RB, the two-boiler one-thermal power unit blower RB operates at 100% rated load before the RB triggers, and the other three blowers are normal.

When the first blower 1 trips due to faults and the blowers RB of the two boiler-machine sets are triggered, the second boiler 16 does not need to trip one blower at the same time, the working condition of the blower RB cannot be triggered as the first boiler 6, after the first blower 1 trips, the first valve 3 at the output end of the first blower 1 is closed, the electric control valve 9 on the communicating pipe 19 between the first main blower 17 and the second main blower 18 is directly opened to 80 percent (a certain adjusting means is reserved), the remaining three blowers of the two boilers are adjusted to the maximum output (a general blower is selected, the maximum output is larger than 50 percent of rated load), at the moment, the PID controller 10 automatically adjusts the electric control valve 9 on the communicating pipe 19 according to the difference value of the pressures collected by the first pressure transmitter 5 and the second pressure transmitter 15 at the moment, so that the pressure deviation of the main blowers of the two boilers is within 0.5kPa, make up as far as possible because the first blower 1 trips, make the air supply amount that the first boiler 6 loses; after the two boilers slowly approach to the stable state, the three air blowers are slowly turned down to the rated load operation at 1%/min according to the actual conditions of the unit, and in the process, the PID controller 10 always maintains the pressure of the air supply main pipes of the two boilers within 0.5 kPa. Under the improvement method of the utility model, when the two-furnace one-machine blower RB is triggered, the air supply system of the whole unit can be regarded as a whole, and under the condition that the output of one blower is lost, the air supply system of the whole unit is provided by the remaining three blowers, in other words, the whole unit still maintains 75% of air supply capacity, so the target load of the blower RB of the two-furnace one-machine thermal power unit can be completely optimized to 75% of rated load. At this point, the unit operator has two options: firstly, the unit continues to normally operate in a 75% rated load state; second, the operator safely reduces the unit load to 50% at a rate of 1% rated load reduction per minute until any blower of the other boiler (second boiler 16) is safely stopped. In the process, the PID controller 10 always controls the opening degree of the electric regulating valve 9 on the regulating communicating pipe 19 to maintain the pressure of the two boiler air supply main pipes within 0.5kPa until the other boiler (the second boiler 16) safely stops one air supply, at the moment, the electric regulating valve 9 on the regulating communicating pipe 19 is controlled to be in a closed state, and the PID controller 10 also stops working. The improvement method successfully helps two furnaces and one thermal power generating unit to complete the RB working condition of the air feeder.

Finally, it should be noted that: the above-mentioned embodiments are only specific embodiments of the present invention, which are used for illustrating the technical solutions of the present invention and not for limiting the same, and the protection scope of the present invention is not limited thereto, although the present invention is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the embodiments of the present invention, and they should be construed as being included therein. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (8)

1. A system for improving RB working conditions of a blower of a two-furnace thermal power unit is characterized by comprising a first blower (1), a second blower (2), a first air supply main pipe (17), a first pressure transmitter (5), a first boiler (6), a third blower (11), a fourth blower (12), a second air supply main pipe (18), a second pressure transmitter (15), a second boiler (16), a communicating pipe (19), an electric regulating valve (9) and a PID controller (10), wherein the output ends of the first blower (1) and the second blower (2) are communicated with one end of the first air supply main pipe (17), the other end of the first air supply main pipe (17) is communicated with the first boiler (6), the output ends of the third blower (11) and the fourth blower (12) are communicated with one end of the second air supply main pipe (18), the other end of the second air supply main pipe (18) with second boiler (16) intercommunication, the one end of communicating pipe (19) with the first air supply main pipe (17) intercommunication, the other end of communicating pipe (19) with the second air supply main pipe (18) intercommunication, electric control valve (9) set up on communicating pipe (19), first pressure transmitter (5) with second pressure transmitter (15) set up respectively first air supply main pipe (17) with on the second air supply main pipe (18), PID controller (10) respectively with first pressure transmitter (5) second pressure transmitter (15) with electric control valve (9) are connected.

2. The system for improving the operation condition of the blower RB of the two-boiler one-thermal power generating unit according to claim 1, wherein the electric regulating valve (9) is located at an intermediate position of the communicating pipe (19).

3. The system for improving the RB working condition of the two-furnace one-thermal power generating unit blower is characterized in that the connection position of the communication pipe (19) and the first air supply main pipe (17) is close to the output ends of the first blower (1) and the second blower (2), and the connection position of the communication pipe (19) and the second air supply main pipe (18) is close to the output ends of the third blower (11) and the fourth blower (12).

4. The system for improving the RB working condition of the two-furnace one-thermal power generating unit blower is characterized in that the first pressure transmitter (5) is close to the connecting position of the communicating pipe (19) and the first air supply main pipe (17), and the second pressure transmitter (15) is close to the connecting position of the communicating pipe (19) and the second air supply main pipe (18).

5. The system for improving the RB working condition of the two-furnace one-thermal power unit blower is characterized in that the output ends of the first blower (1) and the second blower (2) are respectively provided with a first valve (3) and a second valve (4).

6. The system for improving the RB condition of the two-furnace one-thermal power unit blower is characterized in that the output ends of the third blower (11) and the fourth blower (12) are respectively provided with a third valve (13) and a fourth valve (14).

7. The system for improving the RB working condition of the two-furnace one-thermal power generating unit blower is characterized in that the PID controller (10) is used for controlling and adjusting the opening degree of the electric adjusting valve (9) on the communicating pipe (19) according to the pressure of the first air supply main pipe (17) collected by the first pressure transmitter (5) and the pressure of the second air supply main pipe (18) collected by the second pressure transmitter (15), so that the pressure of the first air supply main pipe (17) and the pressure of the second air supply main pipe (18) are in a balanced state.

8. The system for improving RB operating conditions of a two-furnace one-thermal power unit blower according to claim 1, wherein the PID controller (10) employs an ovation system or HNICS-T316.

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