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GBZ21193.1-2007: Fossil-fired steam power stations -- Part 1: Limiting controls
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| GB/Z 21193.1-2007 | English | 874 |
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Fossil-fired steam power stations -- Part 1: Limiting controls
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GB/Z 21193.1-2007
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Basic data | Standard ID | GB/Z 21193.1-2007 (GB/Z21193.1-2007) | | Description (Translated English) | Fossil-fired steam power stations -- Part 1: Limiting controls | | Sector / Industry | National Standard | | Classification of Chinese Standard | N18 | | Classification of International Standard | 25.040.40; 27.100 | | Word Count Estimation | 44,432 | | Date of Issue | 2007-11-14 | | Date of Implementation | 2008-05-01 | | Adopted Standard | IEC/TR 62140-1-2002, IDT | | Regulation (derived from) | China National Standard Approval Announcement2007 No.12 (Total No.112) | | Issuing agency(ies) | Ministry of Health of the People's Republic of China | | Summary | This standard specifies the limited fossil fired steam power plant radiation control. From the limited mandate and role of radiation control point of view, they are located between the actual operational control and protection equipment. Operation control output task is always generated corresponding to the value set in advance to control the power generation mode. And various subsystems running in this purpose in accordance with the requirements of economic and environmental. The main task is to protect the device by stopping ways to protect personnel, environment and the equipment and its components are not damaged. Limit radiation control is used to support operational control, therefore, possible restrictions which can run continuously during the transition, for example, during startup and shutdown, as well as abnormal operating situations. Limit radiation control is often used to control the operation of the actuator, as they can be removed as operational control. Yet. When the limit is removed when the radiation control, protective equipment before being triggered, automatically pre- process value to the limitation no longer exists, therefore, limiting the different control and protection equipment, protective equipment can not be cut off, and it's mostly through its dedicated implementing agencies to play a role. The technical guidance document has nothing to do with the operation of the control and protection equipment. Control task subsystem can run with different devices and change the whole situation. To accommodate a variety of control tasks, texture mapping is performed. The following structure is optional equipment available: -between the operation control and limiting control, -in limiter control, -in the run control. | GBZ21193.1-2007: Fossil-fired steam power stations -- Part 1: Limiting controls---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
GB /Z 21193.1-2007
Fossil-fired steam power stations.Part 1. Limiting controls
ICS 25.040.40; 27.100
N18
National Standardization Technical Document of the People's Republic of China
GB /Z21193.1-2007/IEC /TR62140-1.2002
Mineral burning steam power station
Part 1. Limiting control
(IEC /T R62140-1.2002, IDT)
Released on.2007-11-14
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China
China National Standardization Administration issued
Content
Foreword III
Introduction IV
1 Scope 1
2 symbols, subscripts, abbreviations 1
2.1 Symbol 1
2.2 Subscript 2
2.3 Abbreviations (also used as subscripts) 2
3 limit control function 2
3.1 The value of the clip 3
3.2 Limiting Functional Module 3
4 Limit Control List 4
Appendix A (informative) Boiler steam pressure upper limit 8
A. 1 Task 8
A. 2 Control Structure Description 8
A. 3 operating characteristics 10
A. 4 Additional information 10
Appendix B (informative) Boiler steam pressure lower limit 11
B. 1 Task 11
B. 2 Control Structure Description 11
B. 3 operating characteristics 12
B. 4 Additional Information 13
Appendix C (informative) Thermal stress limiting control in pressure-bearing components 14
C. 1 Task 14
C. 2 Control Structure Description 14
C. 3 operating characteristics 15
Appendix D (informative) Lower limit of evaporator flow in a DC boiler 17
D. 1 Task 17
D. 2 Control Structure Description 17
D. 3 operating characteristics 21
Appendix E (informative) Limiting control of the water supply functional group 24
E. 1 Task 24
E. 2 Control Structure Description 26
E. 3 operating characteristics 26
E. 4 More complex control structures 29
Appendix F (informative) The lower limit of the heat output of the furnace, taking the direct combustion of the pulverized coal furnace as an example 31
F. 1 Task 31
F. 2 Control Structure Description 32
F. 3 operating characteristics 32
GB /Z21193.1-2007/IEC /TR62140-1.2002
Appendix G (informative) Allowable turbine thermal stress 36
G. 1 Task 36
G. 2 Control System Description 37
G. 3 Operating characteristics 37
G. 4 Additional information 38
Figure 1 Changes in the whole process of the controlled variable 3
Figure A. 1 The upper limit steam pressure limiting control device control loop using bypass equipment is shown in Figure 8.
Figure A. 2 Pressure characteristic values of conventional power station units (indicated by the modified smoothing pressure) 9
Figure A. 3 Main control function scheme of conventional power station steam bypass equipment 9
Figure B. 1 Lower limit steam pressure limiting control device control circuit Figure 11
Figure B. 2 Pressure characteristic value of conventional power station unit (indicated by modified smooth pressure) 12
Figure B. 3 Main control function scheme of main steam pressure minimum pressure control in conventional power station 12
Figure C. 1 data recording, calculation, display; text of limit control 14
Figure C. 2 steam temperature setting value given 15
Figure D. 1 Start the low-power running start system 17
Figure D. 2 Feed water control with circulating pump in main flow 18
Figure D. 3 Feed water control with circulation pump in bypass flow 19
Figure D. 4 Feed water control by circulating feed pump 20
Figure D. 5 Limitation of evaporator flow during load rise 21
Figure D. 6 Limitation of evaporator flow during shutdown 22
Figure E. 1 Water supply function group equipment full view 25
Figure E. 2 Feed pump features with limit curve 26
Figure E. 3 Water supply control simplified function scheme with limiting and structural transformation 28
Figure E. 4 Conventional scheme for water supply control with speed control electric pump and low output control valve 29
Figure F. 1 Pulverizing unit equipment connection diagram 31
Figure F. 2 Conventional scheme for minimum furnace heat output limiting control 33
Figure F. 3 Example of starting the powder unit with oil supply. The minimum oil output of the oil ignition output (to ignite the coal). Using other combustion
Group to meet the furnace heat output of the boiler 34
Figure F. 4 Example of a shutdown of the milling unit. Use other burner sets to meet the furnace heat output of the boiler 34
Figure G. 1 Formation of stress tolerances 36
Table 1 Limit Control List 4
Table D. 1 20
Table E. 1 Assignment of controlled variables, reference variables and operational variables 26
Table E. 2 Assignment of controlled variables, reference variables and manipulated variables 30
GB /Z21193.1-2007/IEC /TR62140-1.2002
Foreword
GB /Z21193 "Mineral Combustion Steam Power Station" is divided into the following sections.
--- Part 1. Limiting control;
--- Part 2. Drum water level control;
--- Part 3. Steam temperature control.
This part is the first part of GB /Z21193.
This part is equivalent to IEC /T R62140-1.2002 "Mineral Combustion Steam Power Station Part 1. Limiting Control" (English version).
For ease of use, the following compile changes have been made to IEC /T R62140-1.2002.
a) the words “technical report” were replaced by the words “guidance technical documents”;
b) delete the preface to IEC /T R62140-1.2002;
c) delete the introduction to IEC /T R62140-1.2002;
d) the term “limiter control” in this part is equivalent to “limit control” in the standard GB/T 2900.56-2002;
e) According to the regular publications and standards of the power industry, the abbreviation “Boiler SG” in this section is changed to “Boiler B”.
Appendix A, Appendix B, Appendix C, Appendix D, Appendix E, Appendix F and Appendix G of this part are informative annexes.
This part was proposed by the China Machinery Industry Federation.
This part is under the jurisdiction of the Second Technical Committee of the National Industrial Process Measurement and Control Standardization Technical Committee.
This section is responsible for drafting the unit. Southwest University.
Participated in the drafting of this section. Mechanical Industry Instrumentation and Instrumentation Institute of Integrated Technology and Economics, China Silian Instrument and Meter Group, Xi'an Thermal Power
Research Institute Co., Ltd., Beijing Machinery Industry Automation Research Institute, Shanghai Industrial Automation Instrumentation Institute.
The main drafters of this section. Zhao Yixin, Liu Feng, Pan Dongbo.
Participated in the drafting of this section. Feng Xiaosheng, Liu Jin, Zhou Ming, Xie Bingbing, Chen Shien.
This section is the first release.
GB /Z21193.1-2007/IEC /TR62140-1.2002
Introduction
This part is part of GB /Z21193, which contains the correct design and operation of the control circuit for the mineral burning power station.
Suggestions. They are based on the current technical solutions, and in order to understand them correctly, this section also presents the necessary backs.
Scene information.
This section proposes or contains special technical solutions, mainly to meet the needs of similar user needs, forming a recognized
Method to represent the functional needs of operators and suppliers of mineral burning power plants.
In the given time, this section is strictly regarded as a specific technical solution example, the purpose of which is to encourage the topic.
The idea is unified and the discussion is promoted.
There are two types of instructional technical documents in GB /Z21193.
The first type of guidance technical document relates to special control loops for boilers, such as drum water level control or steam temperature control, and
The normal operating conditions in which they are located.
The second type of guidance technical document points out special ways to ensure proper operation under restricted conditions, such as rising and falling
During the period, or in abnormal operating conditions, or they are related to the furnace control system, such as load control system or frequency control system. These ones
Guidance technical documents usually group power plant units into one.
Each part of GB /Z21193 is independent of each other, however, their content is largely coordinated. This department
Columns can be added.
GB /Z21193.1-2007/IEC /TR62140-1.2002
Mineral burning steam power station
Part 1. Limiting control
1 Scope
This section covers the limiting control of mineral-fired steam power stations.
From the perspective of the task and role of the limit control, they are located between the actual operational control and the protection device. The task of running control is
The resulting output always controls the power generation process in a manner corresponding to the preset values, and for this purpose each subsystem is economically and cyclically
The requirements of the environment are running. The task of protecting equipment is primarily to protect people, the environment, and the equipment and its components from damage by means of downtime.
The limiter control is used to support the run control, so it can run continuously under the constraints that may be imposed during the transition, for example, at boot
And during downtime, as well as in abnormal operating conditions.
Limiting control often uses actuators with operational controls that can be cut off like operational controls. However, when the limit control is
When cutting off, the pre-automatic clipping of the process value no longer exists before the protection device is triggered. Therefore, the limiting control is different from the protection device.
The protective device cannot be cut off, and most of it works through its dedicated actuator. This guidance technical document and operational control
The system is independent of the protection device.
Subsystem control tasks can vary with the overall device operating conditions. In order to adapt to various control tasks, the structural transformation is
carried out. The following are optional structures available for the device.
--- between the operation control and the limit control;
--- Within the limit control;
--- In the operation control.
Therefore, for process tasks, structural transformation is not an isolated control solution, they are involved in this section along with clipping control.
(See Appendix A to Appendix G).
2 symbols, subscripts, abbreviations
The following symbols, subscripts and abbreviations apply to this section.
2.1 symbol
Speed
Power P;
Heat Q;
Heat flux Q;
Temperature ;
Temperature difference Δ;
Material stress σ;
GB /Z21193.1-2007/IEC /TR62140-1.2002
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