SU1229513A1 - System for automatic control of drum boiler feed - Google Patents

System for automatic control of drum boiler feed Download PDF

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Publication number
SU1229513A1
SU1229513A1 SU833618876A SU3618876A SU1229513A1 SU 1229513 A1 SU1229513 A1 SU 1229513A1 SU 833618876 A SU833618876 A SU 833618876A SU 3618876 A SU3618876 A SU 3618876A SU 1229513 A1 SU1229513 A1 SU 1229513A1
Authority
SU
USSR - Soviet Union
Prior art keywords
inputs
flow
boiler
output
controller
Prior art date
Application number
SU833618876A
Other languages
Russian (ru)
Inventor
Валентин Кузьмич Глухов
Людмила Михайловна Павлова
Ирина Константиновна Степанищева
Original Assignee
Предприятие П/Я А-3513
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Предприятие П/Я А-3513 filed Critical Предприятие П/Я А-3513
Priority to SU833618876A priority Critical patent/SU1229513A1/en
Application granted granted Critical
Publication of SU1229513A1 publication Critical patent/SU1229513A1/en

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Description

12
The invention relates to the field of automation of drum boilers of thermal power plants and in particular can be used on steam boilers of a heat and power plant with a large selection of steam for production
The purpose of the invention is to increase the reliability of the boiler.
The drawing shows the scheme of the proposed system.
The boiler control system contains a level 2 regulator, a flow regulator 3, a first switch 4, executive units 5 and 6, a command block 7, a steam flow sensor 8, a second switch 9, a feed water flow sensor 10, a drum level sensor 11 boiler 1, dividing unit 12, selection unit 13, automatic setting unit 14, adjustment unit 15, actuators 16 and 17.
The system works as follows.
When the boiler 1 is fired up, the signal from the steam flow sensor 8 is absent and the command block 7 is in its first position when its relay is not energized, and the signals at the output of block 7 lead to the following positions 5 / corrected from this block of system elements: block 15 adjustments of the settings of the level 2 regulator provides the gain, integration time and lead time according to the single-pulse level control circuit; Switch 9 is in the Off position, no signals are passed from the 4iiKOB 8 and 10, switch 4 connects the output circuits of the flow controller 3 to the second actuator 17 (bypass valve), and the first MexaimSM 16 closes the actuator 5.
The inputs to the controller 2 signal from the sensor 11 of the water level in the drum ensures the operation of this controller with the necessary settings for its settings. Thus, in the start-up mode, a one-contour automatic level control system in the drum of the boiler 1 acts on the executive body 6,
When the steam flow rate from the boiler I reaches a certain predetermined value (for example, 25% of the nominal value), the signal from sensor 8 excites the command switch32.
foot block 7, which goes into its second position. At the same time, the first switch 4 is switched on irpo-, which connects the signals from sensors 8 and 10 to the flow controller 3 and at the same time switch 4 produces a smooth transition from the actuator 17 to the actuator 16 at a given actual feedwater flow. Thereafter, the trimming unit 15 changes the settings of the controller 2 so as to ensure that this controller operates in the operating load range under the action of the three-loop automatic system for adjusting the level of water in the drum
With a sudden load shedding or with a planned decrease in it, due to the imminent stopping of the boiler, when the steam consumption drops below 0.25 D, the command unit 7 again switches to the first position as in the fire. Switch 9 is turned to Off, no signal passes; 1la from sensors B and 10; switch 4 connects the output circuits of flow controller 3 to the second actuator 17, which opens the bypass actuator 6, and the first actuator 16 gradually closes the main executive body 5, save the required water flow. The adjustment unit for adjusting the parameters of the level 2 regulator switches the settings for the assignment required for the operation of the controller 2 in a single circuit.
If there is a disturbance in the flow of water from boiler 1, for example, when periodic periodic valves are opened and, consequently, there is a static imbalance between the flow rate of boiler water entering the boiler and the steam flow from it, an output which is fed to the input of the automatic setting device 14. If there is a signal from the output of the block 13 at the same time, the automatic setting device 14 sets a new setpoint for the level of controller 2 which takes into account the unbalance of water and steam flow. After the disappearance of the signal, the signal from the block 12 disappears and the automatic setting device 14 again sets the zero value of the level to the controller 2.

Claims (1)

  1. AUTOMATIC DRUM POWER SUPPLY CONTROL SYSTEM containing a sequentially installed level controller, a flow controller and a first switch, the outputs of which are connected to the actuators, a command unit whose input is connected to a steam flow sensor, and the output - to one of the inputs of the second switch, to the rest of the inputs which is connected to the flow sensors of feed water and steam, and the output of the second switch is connected to one of the inputs of the flow controller, and the water level sensor in the boiler drum, which is different we note that, in order to increase the reliability of the boiler by adjusting the setting of the water level controller in the boiler drum under external disturbances by the flow of water from the boiler, the system additionally contains a division unit, a selection unit and an automatic adjuster, the output of which is connected to one of the inputs of the level controller, and inputs - with the output of the division unit and the output of the selection unit, and the water level in the boiler drum is connected to the input of the latter, and the flow sensors of feed water and steam are connected to the inputs of the division unit.
    SU,. ,, 1229513
SU833618876A 1983-06-03 1983-06-03 System for automatic control of drum boiler feed SU1229513A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
SU833618876A SU1229513A1 (en) 1983-06-03 1983-06-03 System for automatic control of drum boiler feed

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SU833618876A SU1229513A1 (en) 1983-06-03 1983-06-03 System for automatic control of drum boiler feed

Publications (1)

Publication Number Publication Date
SU1229513A1 true SU1229513A1 (en) 1986-05-07

Family

ID=21073376

Family Applications (1)

Application Number Title Priority Date Filing Date
SU833618876A SU1229513A1 (en) 1983-06-03 1983-06-03 System for automatic control of drum boiler feed

Country Status (1)

Country Link
SU (1) SU1229513A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2556957C2 (en) * 2010-05-28 2015-07-20 Дженерал Электрик Компани Method of water level adjustment in drum of heat recovery steam generating unit (versions) and heat recovery steam generating unit

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Авторское свидетельство СССР № 861841, кл. F 22 D 3/30 1976. *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2556957C2 (en) * 2010-05-28 2015-07-20 Дженерал Электрик Компани Method of water level adjustment in drum of heat recovery steam generating unit (versions) and heat recovery steam generating unit

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