CN109469920B - Fire temperature control system for boiler heating - Google Patents
Fire temperature control system for boiler heating Download PDFInfo
- Publication number
- CN109469920B CN109469920B CN201811229720.XA CN201811229720A CN109469920B CN 109469920 B CN109469920 B CN 109469920B CN 201811229720 A CN201811229720 A CN 201811229720A CN 109469920 B CN109469920 B CN 109469920B
- Authority
- CN
- China
- Prior art keywords
- controller
- air
- electromagnetic valve
- air pipeline
- fire
- 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
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N1/00—Regulating fuel supply
- F23N1/02—Regulating fuel supply conjointly with air supply
- F23N1/025—Regulating fuel supply conjointly with air supply using electrical or electromechanical means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2225/00—Measuring
- F23N2225/04—Measuring pressure
Abstract
The invention discloses a fire temperature control system and a fire temperature control method for boiler heating, and relates to the technical field of intelligent control of battery production. The invention comprises a flow regulating device; the flow regulating device comprises a pipe body arranged between a gas nozzle and a gas inlet pipeline, a partition plate is arranged in the pipe body, a plurality of openings are formed in the partition plate, a branch pipe is arranged on each opening, and an electromagnetic valve is arranged on each branch pipe; the steam pressure sensor is connected with the processor through an A/D converter. Through controlling the air input of gas to flow adjusting device to steam pressure through detecting is as control signal, has realized the intelligent dynamic control of boiler fire temperature, has solved the fire temperature manual control troublesome poeration and inaccurate problem that current boiler exists.
Description
Technical Field
The invention belongs to the technical field of intelligent control of battery production, and particularly relates to a boiler heating fire temperature control system and a boiler heating fire temperature control method.
Background
The fire temperature of the existing boiler for battery production is generally manually controlled, the existing 10-ton boiler is always burnt by big fire until being installed, the boiler is stopped at 6 kg of pressure, and is restarted after the pressure is reduced to 4 kg, so that the burning is frequently started, and the boiler can not be started after being stopped, needs to be forcibly started manually, is troublesome to operate, frequently breaks down, is unstable in vapor pressure control, is high in time and low in time, so that the consumption of natural gas is also high; i know the manual control is that a big fire and small fire switching button is arranged on a boiler controller; the big fire and the small fire are switched by manually controlling the big fire and the small fire switching button.
Disclosure of Invention
The invention aims to provide a boiler heating fire temperature control system, which realizes intelligent dynamic control of boiler fire temperature by controlling the air inflow of fuel gas through a flow regulating device and taking detected steam pressure as a control signal, and solves the problems of troublesome manual control operation and inaccuracy of the existing boiler fire temperature.
In order to solve the technical problems, the invention is realized by the following technical scheme:
the invention relates to a fire temperature control system for boiler heating, which comprises a gas nozzle and a gas inlet pipeline, wherein a flow regulating device is arranged between the gas nozzle and the gas inlet pipeline; the flow regulating device comprises a pipe body arranged between a gas nozzle and a gas inlet pipeline, a partition plate is arranged in the pipe body, a plurality of openings are formed in the partition plate, a branch pipe is arranged on each opening, and an electromagnetic valve is arranged on each branch pipe;
the air inlet pipeline is provided with an air pipeline electromagnetic valve and an air pipeline pressure gauge;
the steam pressure sensor is connected with the processor through an A/D converter; the air pipeline pressure gauge is connected with the processor; the signal receiving end of the air pipeline electromagnetic valve is connected with the controller; and the signal output end of the controller is also connected with an ignition controller.
Further, the periphery of the partition plate is in sealing contact with the inner side wall of the pipe body.
Further, the number of the branch pipes is at least 3.
Furthermore, the signal output end of the processor is also connected with a display and an alarm.
A fire temperature control method for boiler heating comprises the following steps:
and step 3, extinguishing: and controlling all the electromagnetic valves to be closed by the controller, delaying for 5-15 seconds, and controlling the electromagnetic valves of the air pipeline to be closed by the controller.
Further, the steam pressure preset values comprise a lowest threshold value Pz1, an adjacent lowest threshold value Pz2, an intermediate threshold value Pz0, an adjacent highest threshold value Pz3 and a highest threshold value Pz 4;
wherein, the numerical magnitude relation of the five Pz1, Pz2, Pz0, Pz3 and Pz4 is Pz4 > Pz3 > Pz0 > Pz2 > Pz 1.
Further, the air pressure preset values comprise a lowest preset value Pk1, an adjacent lowest preset value Pk2, an adjacent highest preset value Pk3 and a highest preset value Pk 4;
the numerical size relationship among Pk1, Pk2, Pk3 and Pk4 is Pk4 > Pk3 > Pk2 > Pk 1.
Further, in the step 2 fire control, the processor reads the data of the steam pressure sensor once every 5 to 10 seconds;
when the vapor pressure of 3-5 consecutive readings is above the adjacent highest threshold Pz 3; at the moment, the processor sends a fire-reducing control instruction to the controller; the controller controls the electromagnetic valves to close at least one of the electromagnetic valves, and simultaneously controls the air inflow through the electromagnetic valve of the air pipeline;
when the vapor pressure read is above the highest threshold Pz 4; at the moment, the processor sends a fire-reducing control instruction to the controller; the controller controls the electromagnetic valves to close at least one of the electromagnetic valves, and simultaneously controls the air inflow through the electromagnetic valve of the air pipeline;
when the vapor pressure for 3-5 consecutive readings is below the adjacent highest threshold Pz 2; at the moment, the processor sends an increase fire control instruction to the controller; the controller controls the electromagnetic valves to start at least one of the electromagnetic valves, and simultaneously controls the air inflow through the electromagnetic valve of the air pipeline;
when the read vapor pressure is below the lowest threshold Pz 1; at the moment, the processor sends an increase fire control instruction to the controller; the controller controls the electromagnetic valves to start at least one of the electromagnetic valves, and simultaneously controls the air intake quantity through the air pipeline electromagnetic valve.
Further, when the ignition is started, the starting number of the plurality of electromagnetic valves is at least 2, and at least one of the plurality of electromagnetic valves is in a closed state.
Further, in the fire control of the step 2, the processor reads the pressure gauge data of the air pipeline once every 5 to 10 seconds;
when the pressure gauge data of the air pipeline read for 3-5 times continuously are higher than the adjacent highest preset value Pk 3; the processor sends out an alarm signal by controlling the alarm;
when the read data are higher than the highest preset value Pk4, the processor sends out an alarm signal by controlling the alarm;
when the pressure gauge data of the air pipeline read for 3-5 times continuously are lower than the adjacent lowest preset value Pk 2; the processor sends out an alarm signal by controlling the alarm;
when the data read by the processor is lower than the minimum preset value Pk1, the processor sends out an alarm signal by controlling the alarm.
The invention has the following beneficial effects:
according to the invention, the air inflow of the fuel gas is controlled by the flow regulating device, and the detected steam pressure is used as a control signal, so that the intelligent dynamic control of the boiler fire temperature is realized, the problems of troublesome manual control operation and inaccuracy of the fire temperature of the existing boiler are solved, and the fuel gas consumption is saved by about 10%; meanwhile, the air inflow of the gas is adjusted, and the air inflow is adjusted at the same time, so that the problems of gas waste caused by insufficient gas combustion or low flame temperature caused by excessive air are avoided; the invention arranges branch pipe in the flow adjusting device and arranges electromagnetic valve on the branch pipe; the problem of abnormal change of fire temperature during switching of big fire and small fire is avoided; the invention can find the fault in time and give an alarm through the alarm by detecting and analyzing the steam pressure and the air pressure of the pipeline, thereby being convenient for processing the fault in time.
Of course, it is not necessary for any product in which the invention is practiced to achieve all of the above-described advantages at the same time.
Drawings
In order to more clearly illustrate the technical solutions of 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 only 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 view of a flow regulating device according to the present invention;
FIG. 2 is a block diagram of a control system of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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.
Referring to fig. 1-2, the present invention relates to a fire temperature control system for boiler heating, which comprises a gas nozzle 1 and a gas inlet pipe 3, wherein a flow rate adjusting device is arranged between the gas nozzle 1 and the gas inlet pipe 3; the flow regulating device comprises a pipe body 2 arranged between a gas nozzle 1 and a gas inlet pipeline 3, a partition plate 21 is arranged in the pipe body 2, a plurality of holes are formed in the partition plate 21, a branch pipe 22 is arranged on each hole, and an electromagnetic valve 22 is arranged on each branch pipe 22;
the air inlet pipeline is provided with an air pipeline electromagnetic valve and an air pipeline pressure gauge;
the steam pressure sensor is connected with the processor through an A/D converter; the air pipeline pressure gauge is connected with the processor; the signal receiving end of the air pipeline electromagnetic valve is connected with the controller; the signal output end of the controller is also connected with an ignition controller.
Preferably, the peripheral side of the partition plate 21 is in sealing contact with the inner side wall of the pipe body 2.
Preferably, the number of branch pipes 22 is 5.
Preferably, the signal output end of the processor is also connected with a display and an alarm, and the alarm is a buzzer; the display adopts a touch screen as a display terminal, can intuitively reproduce the working states of a burner, an air electromagnetic valve, a gas electromagnetic valve and the like on the touch screen, and can display alarm information and alarm history records, temperature history and real curves in time;
the processor is selected from a 16-bit X86 microprocessor PHOTOPIA (programmable logic array) from PW.
Preferably, the controller is a PLC controller, and an S7-300PLC controller manufactured by Siemens is adopted; the air pipeline pressure gauge is a DPGM409 series digital pressure gauge; the steam pressure sensor is of the type PTC 305H.
A fire temperature control method for boiler heating comprises the following steps:
and step 3, extinguishing: and controlling all the electromagnetic valves 22 to be closed through the controller, delaying for 5-15 seconds, and then controlling the electromagnetic valves of the air pipeline to be closed through the controller.
Preferably, the preset values of steam pressure comprise a lowest threshold value Pz1, an adjacent lowest threshold value Pz2, an intermediate threshold value Pz0, an adjacent highest threshold value Pz3 and a highest threshold value Pz 4;
wherein, the numerical size relationship of Pz1, Pz2, Pz0, Pz3 and Pz4 is Pz4 > Pz3 > Pz0 > Pz2 > Pz 1.
Preferably, the preset values of air pressure comprise a lowest preset value Pk1, an adjacent lowest preset value Pk2, an adjacent highest preset value Pk3 and a highest preset value Pk 4;
wherein, the numerical size relationship among Pk1, Pk2, Pk3 and Pk4 is Pk4 > Pk3 > Pk2 > Pk 1.
Preferably, in the step 2 fire control, the processor reads the data of the steam pressure sensor every 5 seconds;
when the vapor pressure for 3 consecutive readings is above the adjacent highest threshold Pz 3; at the moment, the processor sends a fire-reducing control instruction to the controller; the controller controls the electromagnetic valves 22 to close 1 or 2, and simultaneously controls the air inflow through the air pipeline electromagnetic valve;
when the vapor pressure read is above the highest threshold Pz 4; at the moment, the processor sends a fire-reducing control instruction to the controller; the controller controls the electromagnetic valves 22 to close 1 or 2, and simultaneously controls the air inflow through the air pipeline electromagnetic valve;
when the vapor pressure for 3 consecutive readings is below the adjacent highest threshold Pz 2; at the moment, the processor sends an increase fire control instruction to the controller; the controller controls the electromagnetic valves 22 to start 1 or 2, and simultaneously controls the air inflow through the electromagnetic valve of the air pipeline;
when the read vapor pressure is below the lowest threshold Pz 1; at the moment, the processor sends an increase fire control instruction to the controller; the controller controls the electromagnetic valve 22 to start 1 or 2, and simultaneously controls the air inlet quantity through the air pipeline electromagnetic valve.
Preferably, the number of actuations of the solenoid valves 22 at the time of ignition initiation is 3.
Preferably, in the step 2 of fire control, the processor reads the pressure gauge data of the air pipeline once every 5 seconds;
when the pressure gauge data of the air pipeline read for 3 times continuously are higher than the adjacent highest preset value Pk 3; the processor sends out an alarm signal by controlling the alarm;
when the read data are higher than the highest preset value Pk4, the processor sends out an alarm signal by controlling the alarm;
when the pressure gauge data of the air pipeline read for 3 times continuously are lower than the adjacent lowest preset value Pk 2; the processor sends out an alarm signal by controlling the alarm;
when the data read by the processor is lower than the minimum preset value Pk1, the processor sends out an alarm signal by controlling the alarm.
Preferably, the steam pressure preset values are as follows:
| item | Pz1 | Pz2 | Pz0 | Pz3 | Pz4 |
| Pressure (kg) | 3.5 | 4.0 | 5 | 6.0 | 6.5 |
Preferably, the air pressure preset values are as follows:
| item | Pk1 | Pk2 | Pk3 | Pk4 |
| Pressure (kg) | 1.5 | 1.7 | 2.2 | 2.5 |
The natural gas usage varied before and after use of the system of the invention:
from the above, the fuel gas consumption is saved by 10% per month after the system and the control method are used.
In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims (5)
1. The utility model provides a boiler heating is with fire temperature control system, includes gas nozzle (1) and gas admission line (3), its characterized in that: a flow regulating device is arranged between the gas nozzle (1) and the gas inlet pipeline (3); the flow regulating device comprises a pipe body (2) arranged between a gas nozzle (1) and a gas inlet pipeline (3), a partition plate (21) is arranged in the pipe body (2), a plurality of holes are formed in the partition plate (21), a branch pipe (22) is arranged on each hole, and an electromagnetic valve (23) is arranged on each branch pipe (22);
the air inlet pipeline is provided with an air pipeline electromagnetic valve and an air pipeline pressure gauge;
the steam pressure sensor is connected with the processor through an A/D converter;
the air pipeline pressure gauge is connected with the processor; the signal receiving end of the air pipeline electromagnetic valve is connected with the controller;
and the signal output end of the controller is also connected with an ignition controller.
2. A fire control system for boiler heating according to claim 1, wherein the partition plate (21) is in sealing contact with the inner side wall of the tube body (2) on the circumferential side.
3. A fire control system for boiler heating in accordance with claim 1, characterized in that the number of said branch pipes (22) is at least 3.
4. The system of claim 1, wherein the signal output end of the processor is further connected with a display and an alarm.
5. The fire temperature control method of a fire temperature control system for boiler heating according to any one of claims 1 to 4, comprising the steps of:
step 1, ignition:
the processor sends an ignition control signal to the controller, and the controller controls the ignition controller to perform ignition operation;
step 2, fire control:
detecting steam pressure Pz through a steam pressure sensor, and detecting air pressure Pk in an air pipeline through an air pipeline pressure gauge; the detected steam pressure Pz is compared with a preset steam pressure value, and the starting/closing number of the electromagnetic valves (23) is controlled through the controller, so that the fuel gas amount is regulated and controlled; comparing the detected air pressure Pk with an air pressure preset value, and controlling the valve degree of an air pipeline electromagnetic valve through a controller so as to regulate and control the air inflow;
and step 3, extinguishing:
after the controller controls all the electromagnetic valves (23) to be closed and delays for 5-15 seconds, the controller controls the air pipeline electromagnetic valves to be closed;
the preset values of the steam pressure comprise a lowest threshold value Pz1, an adjacent lowest threshold value Pz2, an intermediate threshold value Pz0, an adjacent highest threshold value Pz3 and a highest threshold value Pz 4;
wherein, the numerical magnitude relation of the five Pz1, Pz2, Pz0, Pz3 and Pz4 is Pz4 > Pz3 > Pz0 > Pz2 > Pz 1;
the preset air pressure values comprise a lowest preset value Pk1, an adjacent lowest preset value Pk2, an adjacent highest preset value Pk3 and a highest preset value Pk 4;
the numerical size relationship among Pk1, Pk2, Pk3 and Pk4 is Pk4 > Pk3 > Pk2 > Pk 1.
In the step 2, in the fire control, the processor reads the data of the steam pressure sensor every 5 to 10 seconds;
when the vapor pressure of 3-5 consecutive readings is above the adjacent highest threshold Pz 3; at the moment, the processor sends a fire-reducing control instruction to the controller; the controller controls at least one electromagnetic valve (23) to close, and simultaneously controls the air inflow through the electromagnetic valve of the air pipeline;
when the vapor pressure read is above the highest threshold Pz 4; at the moment, the processor sends a fire-reducing control instruction to the controller; the controller controls at least one electromagnetic valve (23) to close, and simultaneously controls the air inflow through the electromagnetic valve of the air pipeline;
when the vapor pressure for 3-5 consecutive readings is below the adjacent lowest threshold Pz 2; at the moment, the processor sends an increase fire control instruction to the controller; the controller controls at least one electromagnetic valve (23) to start, and simultaneously controls the air inflow through the electromagnetic valve of the air pipeline;
when the read vapor pressure is below the lowest threshold Pz 1; at the moment, the processor sends an increase fire control instruction to the controller; the controller controls at least one electromagnetic valve (23) to close, and simultaneously controls the air inflow through the electromagnetic valve of the air pipeline;
when the ignition is started, the starting number of the plurality of electromagnetic valves (23) is at least 2, and at least one of the plurality of electromagnetic valves (23) is in a closed state;
in the step 2, in the fire control, the processor reads the pressure gauge data of the air pipeline once every 5 to 10 seconds;
when the pressure gauge data of the air pipeline read for 3-5 times continuously are higher than the adjacent highest preset value Pk 3; the processor sends out an alarm signal by controlling the alarm;
when the read data are higher than the highest preset value Pk4, the processor sends out an alarm signal by controlling the alarm;
when the pressure gauge data of the air pipeline read for 3-5 times continuously are lower than the adjacent lowest preset value Pk 2; the processor sends out an alarm signal by controlling the alarm; when the data read by the processor is lower than the minimum preset value Pk1, the processor sends out an alarm signal by controlling the alarm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811229720.XA CN109469920B (en) | 2018-10-22 | 2018-10-22 | Fire temperature control system for boiler heating |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811229720.XA CN109469920B (en) | 2018-10-22 | 2018-10-22 | Fire temperature control system for boiler heating |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109469920A CN109469920A (en) | 2019-03-15 |
| CN109469920B true CN109469920B (en) | 2020-11-27 |
Family
ID=65665743
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811229720.XA Active CN109469920B (en) | 2018-10-22 | 2018-10-22 | Fire temperature control system for boiler heating |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109469920B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111124001A (en) * | 2020-01-03 | 2020-05-08 | 深圳智慧能源技术有限公司 | Pipeline pressure control system and control method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5592816A (en) * | 1978-12-30 | 1980-07-14 | Shimadzu Corp | Air flow rate regulator for burning device |
| CN202281500U (en) * | 2011-10-08 | 2012-06-20 | 南京正光炉业有限责任公司 | Heating system of gas-fired bogie furnace |
| CN205782890U (en) * | 2016-04-22 | 2016-12-07 | 安阳化学工业集团有限责任公司 | A kind of Combustion Control System for Circulating Fluidized Bed Boiler with interlock protection |
| CN106949461A (en) * | 2017-05-08 | 2017-07-14 | 浙江上能锅炉有限公司 | A kind of steam generator combustion system |
| CN206890566U (en) * | 2017-05-31 | 2018-01-16 | 神雾科技集团股份有限公司 | The system of burner small fire flame rigidity observing and controlling |
-
2018
- 2018-10-22 CN CN201811229720.XA patent/CN109469920B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5592816A (en) * | 1978-12-30 | 1980-07-14 | Shimadzu Corp | Air flow rate regulator for burning device |
| CN202281500U (en) * | 2011-10-08 | 2012-06-20 | 南京正光炉业有限责任公司 | Heating system of gas-fired bogie furnace |
| CN205782890U (en) * | 2016-04-22 | 2016-12-07 | 安阳化学工业集团有限责任公司 | A kind of Combustion Control System for Circulating Fluidized Bed Boiler with interlock protection |
| CN106949461A (en) * | 2017-05-08 | 2017-07-14 | 浙江上能锅炉有限公司 | A kind of steam generator combustion system |
| CN206890566U (en) * | 2017-05-31 | 2018-01-16 | 神雾科技集团股份有限公司 | The system of burner small fire flame rigidity observing and controlling |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109469920A (en) | 2019-03-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105841353B (en) | A kind of gas heater and its control method of width adaptation range | |
| CN104296386B (en) | Control method, control system and the gas heater of gas heater | |
| CN105605796A (en) | Combustible-gas-self-adapting combustible gas water heater and control method thereof | |
| CN104596116A (en) | Control method and control system of water heater and water heater | |
| CN106247353B (en) | A kind of blast furnace gas diffusing ignition system | |
| CN106011352B (en) | A kind of blast funnace hot blast stove gas flow Optimal Control System | |
| CN105674578B (en) | A kind of gas heater and its control method of a pressure self-adjusting section | |
| CN109469920B (en) | Fire temperature control system for boiler heating | |
| CN108019954B (en) | Control method of gas water heater | |
| CN205448258U (en) | Gas heater of gas self -adaptation formula | |
| CN110940094B (en) | Gas water heater control method and gas water heater | |
| JP2020143862A (en) | Water heater, hot water supply program and hot water supply method | |
| CN206771717U (en) | Water heater with small fluctuation of outlet water temperature | |
| CN109612111B (en) | Method for controlling gas water heater with storage tank | |
| CN206310734U (en) | Controller for gas and its burnt gas wall hanging furnace | |
| CN107676960A (en) | Gas heater and its control method | |
| CN201983285U (en) | Alcohol-based fuel vaporation system | |
| CN207379047U (en) | Gas heater | |
| CN110486949B (en) | Double-fan gas water heater control method and gas water heater | |
| CN107091735B (en) | Wall-mounted boiler waterway detection method and device | |
| CN201983416U (en) | Automatic cut-off type gas water heater | |
| CN205280633U (en) | Detect control system based on PLC fuel gas heat value | |
| CN211575176U (en) | Ignition control system of semiconductor equipment | |
| CN110873462B (en) | Carbon deposition reminding control method for gas water heater with carbon deposition reminding function | |
| TWI655384B (en) | Gas system automatically nippers |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |