CN215987007U

CN215987007U - Self-adaptive water supply adjusting system for direct current furnace of coal-fired thermal power generating unit

Info

Publication number: CN215987007U
Application number: CN202121774936.1U
Authority: CN
Inventors: 张雷; 冯佩; 王琦媛; 葛志伟; 袁海锋; 卫鑫
Original assignee: Nanjing Keyuan Intelligent Technology Group Co ltd; NANJING ELECTRIC POWER PLANT OF DATANG GROUP
Current assignee: Nanjing Keyuan Intelligent Technology Group Co ltd; NANJING ELECTRIC POWER PLANT OF DATANG GROUP
Priority date: 2021-08-02
Filing date: 2021-08-02
Publication date: 2022-03-08
Anticipated expiration: 2031-08-02

Abstract

The utility model discloses a coal-fired thermal power generating unit direct current furnace water supply self-adaptive adjusting system.A middle point temperature measuring point, a water supply flow measuring point and a main steam flow measuring point are all led into a control cabinet through shielded cables and are in one-way connection with corresponding IO modules, and the data output ends of the IO modules are in two-way connection with an optimization controller through twisted-pair cables; the optimization controller is correspondingly connected with the DCS engineer station, the operator station and the interface machine through an eNet network; the interface machine is connected with enterprise-level Internet through an isolation network gate in a one-way isolation mode and is in communication connection with the client and the server, and the optimization controller is controlled by the corresponding IO module and is in communication connection with the water supply regulating valve of the execution mechanism. The utility model has the advantages of high automation degree, self-adaptive capacity, strong anti-interference capacity, capability of ensuring that the water supply can be supplemented in time after the linearity is changed under the long-time operation of the valve, certain superheat degree and the like.

Description

Self-adaptive water supply adjusting system for direct current furnace of coal-fired thermal power generating unit

The technical field is as follows:

the utility model relates to a self-adaptive water supply adjusting system for a direct current furnace of a coal-fired thermal power generating unit.

Background art:

the feed water regulating system is used as an important component of the thermal power generating unit and plays an important role in stable operation of the unit. In operation, the feedwater conditioning system is primarily intended to maintain the main steam flow fluctuating within a certain range, requiring sufficient superheat for steady state operation of the system. The water supply control loop of a general direct current furnace is mainly carried out according to the coal-water ratio, a feedforward + cascade control mode is adopted, the balance of water supply quantity is mainly adjusted for a secondary regulation part, and the water supply quantity required in a steady state is approximately equal to the water supply quantity corresponding to a load; for the main regulation part, the intermediate point temperature is mainly regulated, and the influence of dry-wet state conversion is relieved. The adjustment of the water supply quantity is not timely adapted to the change of the working condition any more due to the change of the linearity of the valve under the long-term operation of a plurality of sites. The typical structure of some current intelligent control system control networks is as follows: the engineer station and the operator station are positioned on the upper layer of the server, the server is positioned on the upper layer of the controller, the structure ensures that the operation load of the control system is often lower, and the network structure of the system is relatively complex, the reliability is lower, and the data refreshing speed is lower; moreover, most control systems only redundantly configure the controllers, but not the network connections; most key measuring points are not configured redundantly, so that sampled data are often distorted and cannot deal with sudden faults, and a large influence is generated on a control system.

The utility model content is as follows:

the utility model provides a self-adaptive water supply adjusting system for a direct current furnace of a coal-fired thermal power generating unit in order to solve the problems in the prior art.

The technical scheme adopted by the utility model is as follows:

a coal-fired thermal power generating unit direct current furnace water supply self-adaptive adjusting system comprises a DCS engineer station, an operator station, a server, a client, an execution mechanism water supply adjusting valve, an interface machine, an isolation network gate, a middle point temperature measuring point, a water supply flow measuring point, a main steam flow measuring point, an enterprise Internet and a control cabinet provided with an optimization controller and a plurality of IO modules, wherein the middle point temperature measuring point, the water supply flow measuring point and the main steam flow measuring point are all led into the control cabinet through shielded cables and are in one-way connection with the corresponding IO modules, and the data output ends of the IO modules are in two-way connection with the optimization controller through twisted pairs; the optimization controller is correspondingly connected with the DCS engineer station, the operator station and the interface machine through an eNet network; the interface machine is connected with enterprise-level Internet through an isolation network gate in a one-way isolation mode and is in communication connection with the client and the server, and the optimization controller is controlled by the corresponding IO module and is in communication connection with the water supply regulating valve of the execution mechanism.

Further, the isolation gatekeeper is an isolation gatekeeper Synckeeper 3000.

Further, 3 middle point temperature measuring points are arranged and are measured by a temperature sensor.

Further, 3 main steam flow measuring points are arranged and are measured through a differential pressure type flowmeter.

Further, the feed water flow rate points are arranged in 3 numbers and are measured by a differential pressure type flowmeter.

Furthermore, IO modules in the control cabinet are all in triple redundant configuration, and the output end of the IO module outputs a signal of the optimal result of taking 2 out of 3 to the optimization controller.

Further, the optimization controller is an optimization controller SY9000, the optimization controller SY9000 comprises two independent controllers, the two independent controllers are connected with the IO module in an eBus communication mode, and the output end of the optimization controller SY9000 outputs a result signal obtained by taking 2 out of 1 to the DCS engineer station, the operator station and the interface machine through an eNet.

The utility model improves the structure of the water supply control system, firstly, the connection mode of the controller and the engineer station is improved, the exchange type fast Ethernet eNet of a peer-to-peer structure is adopted, and the redundant configuration is adopted; the intelligent controllers and the like are in redundant configuration; the optimization controller SY9000 internally integrates advanced control strategies. Consider that valve linearity changes under the long-term operation to and the problem that original PID controller parameter can't adapt to that the operating mode change leads to, this utility model can make the quick response disturbance of system, improve the self-adaptability and the stability of organizing the operation into, the beneficial effect who produces from this is: the utility model has the advantages of high automation degree, self-adaptive capacity, strong anti-interference capacity, capability of ensuring that the water supply can be supplemented in time after the linearity is changed under the long-time operation of the valve, certain superheat degree and the like.

Description of the drawings:

FIG. 1 is a block diagram of the present invention.

The specific implementation mode is as follows:

the utility model will be further described with reference to the accompanying drawings.

As shown in fig. 1, the self-adaptive water supply regulation system for the direct current furnace of the coal-fired thermal power generating unit comprises a DCS engineer station 1, an operator station 2, a server 4, a client 5, an execution mechanism water supply regulation valve 7, an interface machine 9, an isolation network gate 10, a middle point temperature measurement point 11, a water supply flow measurement point 12, a main steam flow measurement point 13, an enterprise level Internet and a control cabinet 6 provided with an optimization controller 3 and a plurality of IO modules 8, wherein the middle point temperature measurement point 11, the water supply flow measurement point 12 and the main steam flow measurement point 13 are all led into the control cabinet 6 through shielded cables and are in one-way connection with the corresponding IO modules 8, and the data output end of the IO module 8 is in two-way connection with the optimization controller 3 through a twisted pair; the optimization controller 3 is correspondingly connected with the DCS engineer station 1, the operator station 2 and the interface machine 9 through an eNet network; the interface machine 9 is connected with enterprise-level Internet through an isolation network gate 10 in a one-way isolation mode and is in communication connection with the client 5 and the server 4, and the optimization controller 3 controls and is in communication connection with the water supply regulating valve 7 of the execution mechanism through a corresponding IO module (8).

In the utility model, 3 groups of middle point temperature measuring points 11 are annularly arranged at the outlet of the separator and are measured by a temperature sensor. The 3 groups of main steam flow measuring points 13 are annularly arranged at the steam supply main pipe and are measured by a differential pressure type flowmeter. The 3 sets of feedwater flow points 12 are arranged annularly at the feedwater flow conduit and measured by a differential pressure flowmeter.

The 3 groups of middle point temperature measuring points 11, the 3 groups of water supply flow measuring points 12 and the 3 groups of main steam flow measuring points 13 are converted into 4-20mA current signals through shielded cables, are led into the control cabinet 6 and are connected with the corresponding IO modules 8 in a one-way mode.

The IO module 8 is in triple redundancy configuration, the output end of the IO module is used for enabling the signal of the optimization result of the selection of 2 from 3 to pass through a twisted pair and is in bidirectional connection with the optimization controller 3 in an eBus communication mode, and the IO module is used for enabling output data after redundancy optimization processing to be connected to the optimization controller 3 through eBusA and eBusB respectively.

The optimization controller 3 is an optimization controller SY9000, the optimization controller SY9000 comprises two independent controllers, each controller is connected with an IO module in an eBus communication mode, the optimization controller 3 runs simultaneously in a fault-tolerant redundancy mode and automatically switches without disturbance, and the actual switching time is smaller than 50 us; in addition, the optimization controller 3 is provided with 4 Ethernet ports to realize 2 x 2 network redundancy, and the controller controls the independent switching of the network. 2 x 2 redundancy configuration is adopted for the IO network, the communication of the IO network is not influenced by the failure of any path of the IO network, and a redundancy power supply input mode is also adopted for the power supply to realize undisturbed switching. And the method supports undisturbed online configuration and downloading, and the downloading time is less than 50 ms.

And the output end of the optimization controller 3 outputs the optimal result signal of taking 1 out of 2 to the DCS engineer station 1, the operator station 2 and the interface machine 9 through an eNet.

The interface machine 9 is connected with the enterprise-level Internet and the client 5 through an isolation gateway 10 in a one-way isolation mode, the server 4 is in communication connection, and the isolation gateway 10 is a Synckeeper 3000. And the optimization controller 3 performs internal processing on the engineer station data and then performs control. The water supply flow is adjusted in time according to the measured value of the intermediate point temperature and the measured value of the main steam flow, and meanwhile, the optimization controller 3 is controlled by an IO module 8 and is connected with an execution mechanism water supply adjusting valve 7 in a communication mode.

The eNet network adopts a single-layer network structure and a peer-to-peer network structure, so that the security of the network structure is improved, the control information and the IP information are classified, and a mode with the priority of the control information is adopted. In addition, the eNet network is provided with the maximum redundancy, which comprises a dual Ethernet switch, a controller, a man-machine interface, a dual Ethernet switch interface card and a redundancy bus structure, and adopts a 2 multiplied by 2 redundancy mode.

In addition, the optimization controller and the remote distributed control system also utilize OPC communication to carry out heartbeat detection, and an output instruction of the optimization controller and a control instruction of the DCS are mutually tracked, so that undisturbed switching in the input process is realized.

The operation stability of the control system and the self-adaptive capacity of the system can be effectively improved by carrying out optimized configuration on the network architecture of the control system and carrying out redundant configuration on the controller, the control network and the measuring points in the system.

The foregoing is only a preferred embodiment of this invention and it should be noted that modifications can be made by those skilled in the art without departing from the principle of the utility model and these modifications should also be considered as the protection scope of the utility model.

Claims

1. A coal-fired thermal power generating unit direct current furnace water supply self-adaptive control system which is characterized in that: the intelligent control system comprises a DCS engineer station (1), an operator station (2), a server (4), a client (5), an execution mechanism water supply regulating valve (7), an interface machine (9), an isolation network gate (10), a middle point temperature measuring point (11), a water supply flow measuring point (12), a main steam flow measuring point (13), an enterprise-level Internet and a control cabinet (6) provided with an optimization controller (3) and a plurality of IO modules (8), wherein the middle point temperature measuring point (11), the water supply flow measuring point (12) and the main steam flow measuring point (13) are all led into the control cabinet (6) through shielded cables and are in one-way connection with the corresponding IO modules (8), and the data output end of the IO module (8) is in two-way connection with the optimization controller (3) through a twisted pair; the optimization controller (3) is correspondingly connected with the DCS engineer station (1), the operator station (2) and the interface machine (9) through an eNet network; the interface machine (9) is connected with an enterprise-level Internet through an isolation network gate (10) in a one-way isolation mode and is in communication connection with the client (5) and the server (4), and the optimization controller (3) is controlled by the corresponding IO module (8) and is in communication connection with the water supply regulating valve (7) of the execution mechanism.

2. The self-adaptive water supply regulation system for the direct current furnace of the coal-fired thermal power generating unit according to claim 1, characterized in that: the isolation network gate (10) is an isolation network gate Synckeeper 3000.

3. The self-adaptive water supply regulation system for the direct current furnace of the coal-fired thermal power generating unit according to claim 1, characterized in that: the number of the middle point temperature measuring points (11) is 3, and the middle point temperature measuring points are measured by a temperature sensor.

4. The self-adaptive water supply regulation system for the direct current furnace of the coal-fired thermal power generating unit according to claim 1, characterized in that: the number of the main steam flow measuring points (13) is 3, and the main steam flow measuring points are measured by a differential pressure type flowmeter.

5. The self-adaptive water supply regulation system for the direct current furnace of the coal-fired thermal power generating unit according to claim 1, characterized in that: the number of the feed water flow measuring points (12) is 3, and the feed water flow measuring points are measured by a differential pressure type flowmeter.

6. The self-adaptive water supply regulation system for the direct current furnace of the coal-fired thermal power generating unit according to claim 1, characterized in that: IO modules (8) in the control cabinet (6) are all in triple redundant configuration, and the output end of the IO modules (8) outputs a signal of a selection result of 2 out of 3 to the optimization controller (3).

7. The self-adaptive water supply regulation system for the direct current furnace of the coal-fired thermal power generating unit according to claim 1, characterized in that: optimizing controller (3) is optimizing controller SY9000, and optimizing controller SY9000 includes two independent controllers, and two independent controllers all are connected through eBus communication mode with the IO module, and optimizing controller SY9000 output will 2 take 1 to select the result signal to export for DCS engineer station (1), operator station (2) and interface machine (9) through the eNet.