CN209978017U - Boiler drum water supply regulating system - Google Patents
Boiler drum water supply regulating system Download PDFInfo
- Publication number
- CN209978017U CN209978017U CN201920683488.0U CN201920683488U CN209978017U CN 209978017 U CN209978017 U CN 209978017U CN 201920683488 U CN201920683488 U CN 201920683488U CN 209978017 U CN209978017 U CN 209978017U
- Authority
- CN
- China
- Prior art keywords
- water supply
- controller
- drum
- steam
- flow meter
- Prior art date
- Legal status (The legal status 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 status listed.)
- Active
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 100
- 230000001105 regulatory effect Effects 0.000 title claims abstract description 33
- 239000007788 liquid Substances 0.000 claims abstract description 31
- 239000010865 sewage Substances 0.000 claims abstract description 24
- 230000000737 periodic effect Effects 0.000 claims description 14
- 230000003750 conditioning effect Effects 0.000 claims description 6
- 150000003839 salts Chemical class 0.000 claims description 4
- 239000002699 waste material Substances 0.000 description 5
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 229910019142 PO4 Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000008236 heating water Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000005032 impulse control Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 230000002269 spontaneous effect Effects 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
Images
Landscapes
- Control Of Steam Boilers And Waste-Gas Boilers (AREA)
Abstract
The utility model provides a boiler drum water supply governing system relates to boiler control technical field. The boiler drum water supply adjusting system comprises a drum, a main controller, a secondary controller, a water supply pipeline, a steam pipeline and a sewage discharge pipeline, wherein the drum is provided with a liquid level meter, the water supply pipeline is provided with a water supply adjusting valve and a water supply flow meter, the steam pipeline is provided with a steam flow meter, and the sewage discharge pipeline is provided with a sewage discharge flow meter; the main controller is simultaneously electrically connected with the liquid level meter and the auxiliary controller; the water supply flowmeter, the steam flowmeter and the pollution discharge flowmeter are respectively electrically connected with the sub-controller, the sub-controller is electrically connected with the water supply regulating valve, the sub-controller is set to control the water supply regulating valve according to flow information collected by the water supply flowmeter, the steam flowmeter and the pollution discharge flowmeter and an instruction sent by the main controller so as to regulate the water supply flow of the water supply pipeline, and the water supply flowmeter, the steam flowmeter and the pollution discharge flowmeter are high in control precision and good in stability.
Description
Technical Field
The utility model relates to a boiler control technical field particularly, relates to a boiler drum feedwater governing system.
Background
The liquid level of the steam pocket is an important monitoring parameter for ensuring the stable operation of the boiler, and the monitoring of the liquid level of the steam pocket is a necessary condition for ensuring the balance of the steam flow and the feed water flow of a boiler system. The overhigh liquid level of the steam drum can cause the scaling of the overheater, reduce the efficiency of the overheater and even cause the damage of the steam turbine; too low a drum level can disrupt water circulation and cause boiler damage, even explosion. The conventional boiler drum liquid level cascade three-impulse control system is adjusted by the main controller and the auxiliary controller, the influence of false liquid level on control is eliminated, the control precision is low, the drum liquid level fluctuation is large when the boiler discharges sewage, and the stability is poor.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a boiler drum water supply governing system, its control accuracy is high, and stability is better.
The embodiment of the utility model is realized like this:
a boiler drum water supply regulating system comprises a drum, a main controller, a secondary controller, a water supply pipeline, a steam pipeline and a sewage discharge pipeline, wherein the water supply pipeline, the steam pipeline and the sewage discharge pipeline are communicated with the drum; the main controller is simultaneously electrically connected with the liquid level meter and the auxiliary controller, and the main controller is set to acquire steam drum liquid level information through the liquid level meter; the water supply flowmeter, the steam flowmeter and the pollution discharge flowmeter are respectively and electrically connected with the sub-controller, the sub-controller is electrically connected with the water supply regulating valve, and the sub-controller is set to control the water supply regulating valve according to flow information collected by the water supply flowmeter, the steam flowmeter and the pollution discharge flowmeter and an instruction sent by the main controller so as to regulate the water supply flow of the water supply pipeline.
Further, above-mentioned blowdown pipeline includes continuous blowdown pipeline, and continuous blowdown pipeline connects in the steam pocket in order to be used for the salt of arranging, and continuous blowdown pipeline is provided with first blowdown flowmeter, and first blowdown flowmeter electricity is connected in the sub-controller.
Further, the continuous sewage draining pipeline is provided with a first electric regulating valve.
Further, the blowdown pipeline comprises a periodic blowdown pipeline, the periodic blowdown pipeline is connected to the steam drum for deslagging, and a second blowdown flow meter is arranged on the periodic blowdown pipeline and electrically connected to the secondary controller.
Further, the periodic sewage draining pipeline is provided with a second electric regulating valve.
Further, the main controller and the sub-controller are both PID controllers.
Further, the liquid level meter is an ultrasonic liquid level meter or a radar liquid level meter.
Furthermore, the water supply flow meter and the steam flow meter are vortex street flow transmitters.
Further, the sewage discharge flow meter is a vortex street flow transmitter.
Further, the boiler drum water supply regulating system comprises an economizer and a superheater, the economizer is connected between the water supply pipeline and the drum, and the superheater is connected between the drum and the steam pipeline.
The utility model discloses beneficial effect includes:
the boiler drum water supply regulating system comprises a drum, a main controller, an auxiliary controller, a water supply pipeline, a steam pipeline and a sewage discharge pipeline, wherein the water supply pipeline, the steam pipeline and the sewage discharge pipeline are communicated with the drum; the main controller is simultaneously electrically connected with the liquid level meter and the auxiliary controller, and the main controller is set to acquire steam drum liquid level information through the liquid level meter; the water supply flowmeter, the steam flowmeter and the pollution discharge flowmeter are respectively and electrically connected with the sub-controller, the sub-controller is electrically connected with the water supply regulating valve, and the sub-controller is set to control the water supply regulating valve according to flow information collected by the water supply flowmeter, the steam flowmeter and the pollution discharge flowmeter and an instruction sent by the main controller so as to regulate the water supply flow of the water supply pipeline. Boiler drum feed water governing system introduces the steam-water balance principle into drum liquid level control, and main water supply amount is main steam flow + boiler drum blowdown amount promptly, through increase the feedforward signal of blowdown flow as the secondary control ware in conventional cascade three impulse control system, considers the influence of blowdown flow to the drum liquid level, effectively improves the control accuracy of drum liquid level, and the drum liquid level when can stablizing the blowdown, guarantees the safe operation of boiler.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a schematic structural view of a boiler drum feed water regulating system in an embodiment of the present invention;
fig. 2 is a schematic diagram of a boiler drum water supply regulating system in the embodiment of the present invention.
Icon: 100-a boiler drum water supply regulating system; 110-steam drum; 112-a liquid level meter; 120-a master controller; 130-secondary controller; 140-water supply line; 142-a feed water regulating valve; 144-water feed flow meter; 150-a steam line; 152-a steam flow meter; 160-sewage pipes; 163-continuous blowdown line; 164-a first waste flow meter; 165-a first electrically actuated regulator valve; 166-periodic blowdown line; 168-a second waste flow meter; 169-a second electrically adjustable valve; 170-economizer; 180-superheater.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that the terms "inside" and "outside" are used for indicating the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship that the utility model is usually placed when using, and are only for convenience of describing the present invention and simplifying the description, but not for indicating or implying that the structure or element to be referred must have a specific position, be constructed and operated in a specific position, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used only for layer-distinguishing descriptions and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Referring to fig. 1 and 2, the present embodiment provides a boiler drum feedwater regulating system 100, which includes a drum 110, a main controller 120, a sub-controller 130, and a feedwater line 140, a steam line 150, and a blowdown line 160 connected to the drum 110. The steam drum 110 is provided with a level gauge 112. The feed water line 140 is provided with a feed water regulating valve 142 and a feed water flow meter 144. The steam line 150 is provided with a steam flow meter 152. The sewerage line 160 is provided with a sewerage flow meter. The primary controller 120 is electrically connected to both the level gauge 112 and the secondary controller 130, and the primary controller 120 is configured to obtain drum level information via the level gauge 112. The water supply flow meter 144, the steam flow meter 152 and the pollution discharge flow meter are respectively electrically connected with the sub-controller 130, the sub-controller 130 is electrically connected with the water supply regulating valve 142, and the sub-controller 130 is configured to control the water supply regulating valve 142 to regulate the water supply flow of the water supply pipeline 140 according to flow information collected by the water supply flow meter 144, the steam flow meter 152 and the pollution discharge flow meter and an instruction sent by the main controller 120.
The boiler drum feedwater conditioning system 100 includes, among other things, an economizer 170 and a superheater 180. An economizer 170 is connected between the water supply line 140 and the steam drum 110 for heating water in the steam drum 110. A superheater 180 is connected between the steam drum 110 and the steam line 150 for further heating the steam from the saturation temperature to a superheated temperature.
The waste flow meter includes a first waste flow meter 164 and a second waste flow meter 168.
Specifically, blowdown line 160 includes a continuous blowdown line 163, and continuous blowdown line 163 is connected to drum 110 for discharging salt. The continuous blowdown is to continuously discharge the boiler water with the maximum concentration from the surface layer of the boiler water of the steam drum, and the continuous blowdown has the functions of reducing the salt content and the alkalinity of the boiler water in the steam drum 110 and preventing the influence of the overhigh concentration of the boiler water on the steam quality. The continuous sewage discharge pipeline 163 is provided with a first sewage discharge flow meter 164, and the first sewage discharge flow meter 164 is electrically connected to the sub-controller 130, so that the continuous sewage discharge flow information can be transmitted to the sub-controller 130 as a feed-forward signal, and the sub-controller 130 controls the water supply regulating valve 142 to overcome disturbance of continuous sewage discharge on the liquid level according to the sewage discharge flow information. To facilitate the adjustment of the flow rate of the continuous blowdown, the continuous blowdown line 163 is provided with a first electrical regulating valve 165.
In this embodiment, blowdown line 160 includes a periodic blowdown line 166, the periodic blowdown line 166 connected to the steam drum 110 for blowdown. The periodic sewage disposal is to remove water slag accumulated at the lower part of the boiler and soft sediment formed after phosphate treatment. The periodic blowdown line 166 is provided with a second blowdown flow meter 168, the second blowdown flow meter 168 being electrically connected to the sub-controller 130. To facilitate regulation of the flow of periodic blowdown, the periodic blowdown line 166 is provided with a second electrically actuated regulator valve 169.
In addition, the main controller 120 and the sub-controller 130 are PID controllers. The PID controller (proportional-integral-derivative controller) is composed of a proportional unit P, an integral unit I and a derivative unit D, and is mainly suitable for a system with basically linear and dynamic characteristics not changing along with time. The PID controller compares the collected data with a reference value and then uses this difference to calculate a new input value which is intended to allow the data of the system to reach or remain at the reference value, thereby controlling the controlled variable.
In the present embodiment, the level gauge 112 is an ultrasonic level gauge or a radar level gauge. The water supply flow meter 144 and the steam flow meter 152 are vortex street flow transmitters. The sewage discharge flow is a vortex street flow transmitter. The vortex flow transmitter has small pressure loss, wide measuring range and high precision, and is hardly influenced by parameters such as fluid density, pressure, temperature, viscosity and the like when measuring the working condition volume flow. No movable mechanical parts are needed, so the reliability is high and the maintenance amount is small. In other embodiments, turbine flow meters and the like may also be selected as desired.
The operating principle and the operating process of the boiler drum feedwater regulating system 100 are as follows:
the main controller 120 is electrically connected to both the level gauge 112 and the sub-controller 130, and the main controller 120 receives the drum level signal as a main control signal and outputs the main control signal to control the sub-controller 130. The water supply flow meter 144, the steam flow meter 152 and the pollution discharge flow meter are electrically connected with the sub-controller 130, and the sub-controller 130 is electrically connected with the water supply regulating valve 142. The sub-controller 130 receives a water supply flow signal transmitted to the water flow meter 144, a steam flow signal transmitted by the steam flow meter 152, and a sewage flow signal transmitted by the sewage flow meter in addition to the main controller 120 signal, and the output of the sub-controller 130 controls the water supply regulating valve 142.
The feed water regulating valve 142, feed water flow and the secondary controller 130 form a secondary loop, the task of which is to reflect the regulating effect in time and to quickly eliminate the spontaneous disturbance of the feed water flow. The main loop is formed by the drum liquid level, the main controller 120, the sub-controller 130 and the water supply regulating valve 142, when the liquid level deviates from the set value, the main controller 120 regulates the water supply flow through the sub-controller 130, and the liquid level returns to the set value in the steady state. The steam flow and the blow-down flow form a feedforward control channel, the sum of a steam flow signal, a blow-down flow signal and an output signal of a main regulator is used as a given value of an auxiliary regulator, and when the steam flow is disturbed, an auxiliary loop rapidly changes the water supply flow, so that the liquid level of a steam drum is controlled.
The boiler drum water supply regulating system 100 introduces a steam-water balance principle into a conventional cascade three-impulse control system, namely, the main water supply amount is the main steam amount plus the boiler drum blow-off amount, and a continuous blow-off flow and periodic blow-off flow signal and a steam flow signal are used as feed-forward signals of the secondary controller 130 together, so that the water supply flow is regulated together, the control precision is high, the drum liquid level during blow-off can be stabilized, and the stability is good.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A boiler drum water supply adjusting system is characterized by comprising a drum, a main controller, an auxiliary controller, a water supply pipeline, a steam pipeline and a sewage discharge pipeline, wherein the water supply pipeline, the steam pipeline and the sewage discharge pipeline are communicated with the drum; the main controller is electrically connected with the liquid level meter and the auxiliary controller at the same time, and the main controller is set to acquire drum liquid level information through the liquid level meter; the water supply flow meter, the steam flow meter and the pollution discharge flow meter are respectively electrically connected with the sub-controller, the sub-controller is electrically connected with the water supply regulating valve, and the sub-controller is set to control the water supply regulating valve according to flow information collected by the water supply flow meter, the steam flow meter and the pollution discharge flow meter and an instruction sent by the main controller so as to regulate the water supply flow of the water supply pipeline.
2. A boiler drum feed water conditioning system according to claim 1, characterized in that the blowdown line comprises a continuous blowdown line connected to the drum for salt rejection, the continuous blowdown line being provided with a first blowdown flow meter electrically connected to the secondary controller.
3. The boiler drum feed water conditioning system according to claim 2, wherein the continuous blowdown line is provided with a first electrically actuated regulator valve.
4. A boiler drum feed water conditioning system according to claim 1, characterized in that the blowdown line comprises a periodic blowdown line connected to the drum for deslagging, the periodic blowdown line being provided with a second blowdown flow meter electrically connected to the secondary controller.
5. The boiler drum feed water conditioning system of claim 4, wherein the periodic blowdown line is provided with a second electrically actuated regulator valve.
6. The boiler drum feed water regulation system of claim 1, wherein the primary controller and the secondary controller are both PID controllers.
7. The boiler drum feed water regulation system of claim 1, wherein the level gauge is an ultrasonic level gauge or a radar level gauge.
8. The boiler drum feed water regulation system of claim 1, wherein the feed water flow meter and the steam flow meter are vortex street flow transmitters.
9. The boiler drum feed water regulation system of claim 1, wherein the blowdown flow meter is a vortex street flow transmitter.
10. The boiler drum feed water conditioning system of claim 1, comprising an economizer connected between the feed water line and the drum and a superheater connected between the drum and the steam line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920683488.0U CN209978017U (en) | 2019-05-13 | 2019-05-13 | Boiler drum water supply regulating system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920683488.0U CN209978017U (en) | 2019-05-13 | 2019-05-13 | Boiler drum water supply regulating system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209978017U true CN209978017U (en) | 2020-01-21 |
Family
ID=69262368
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920683488.0U Active CN209978017U (en) | 2019-05-13 | 2019-05-13 | Boiler drum water supply regulating system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209978017U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115095852A (en) * | 2022-06-17 | 2022-09-23 | 华能曲阜热电有限公司 | Intelligent blowdown system of power plant boiler |
-
2019
- 2019-05-13 CN CN201920683488.0U patent/CN209978017U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115095852A (en) * | 2022-06-17 | 2022-09-23 | 华能曲阜热电有限公司 | Intelligent blowdown system of power plant boiler |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102080820B (en) | Optimal energy-saving control method for surface pollution discharge of steam boiler | |
| JP2009150644A (en) | System and method for controlling liquid level in vessel | |
| CN107219758A (en) | A kind of liquid level of steam drum adjusting method | |
| KR880010431A (en) | Reactor plant | |
| JP2010133701A (en) | System and method for controlling liquid level in vessel | |
| CN209978017U (en) | Boiler drum water supply regulating system | |
| US4549503A (en) | Maximum efficiency steam temperature control system | |
| CN111780089A (en) | Water supply control method and system for once-through steam generator | |
| CN105605965A (en) | Automatic online cleaning system and method for self-adapting circulating cooling water heat exchanger | |
| CN201376921Y (en) | Multi-channel paratactic combination feed-water automatic oxygenation device for power plant boiler | |
| CN104373926A (en) | Marine boiler water level control system | |
| CN115095852A (en) | Intelligent blowdown system of power plant boiler | |
| CN109780528B (en) | Three-impulse control method for reducing boiler liquid level overshoot | |
| CN103334799A (en) | Method and system for controlling air inflow of double air inflow condensation-type turbine | |
| Rajkumar et al. | Boiler drum level control by using wide open control with three element control system | |
| CN202625944U (en) | Energy-saving variable-frequency regulating accurate aerating system | |
| CN206039234U (en) | Once -through boiler condensate water ammonifying personalizes and patrols and examines formula intelligence control system | |
| CN104633457A (en) | Real-time online cavitation monitoring and warning system and real-time online cavitation monitoring and warning method for regulating valve of thermal power station | |
| US3947319A (en) | Nuclear reactor plants and control systems therefor | |
| CN112361322A (en) | Boiler feed water automatic ammonia adding device and gray prediction feedforward PID control method | |
| CN106522304B (en) | Gravity flow pressure regulating difference water supply system | |
| CN113149174A (en) | Phosphate control system and method for furnace water and ethylene device | |
| CN202126635U (en) | Liquid level controller for saturated liquid | |
| CN217356859U (en) | Water supply pipeline for low-pressure steam drum of catalytic waste heat boiler | |
| RU2003134954A (en) | METHOD AND DEVICE FOR REGULATING THE WATER FLOW TEMPERATURE EXITING FROM THE HEAT EXCHANGER, AND MEASURING THE PRODUCED HEAT |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |