CN203810367U - Automatic excess-air-coefficient adjusting system of industrial coal-fired boiler - Google Patents

Automatic excess-air-coefficient adjusting system of industrial coal-fired boiler Download PDF

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CN203810367U
CN203810367U CN201420221678.8U CN201420221678U CN203810367U CN 203810367 U CN203810367 U CN 203810367U CN 201420221678 U CN201420221678 U CN 201420221678U CN 203810367 U CN203810367 U CN 203810367U
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air
frequency converter
signal output
plc
drum
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顾宏波
毛天林
许林滔
何红亮
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TAIZHOU ZHONGAO SPECIAL EQUIPMENT INSPECTION AND TECHNICAL SERVICES Co Ltd
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TAIZHOU ZHONGAO SPECIAL EQUIPMENT INSPECTION AND TECHNICAL SERVICES Co Ltd
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Abstract

The utility model provides an automatic excess-air-coefficient adjusting system of an industrial coal-fired boiler, belongs to the technical field of machinery and solves the problem that an existing industrial coal-fired boiler fails to realize excess air coefficient. The industrial coal-fired boiler comprises a boiler drum, a water feed pump, a fire grate, a hearth, a flue, an air duct, a draught fan and an air blower, and the automatic excess-air-coefficient adjusting system comprises a PLC (programmable logic controller), a water level sensor, a boiler drum steam pressure sensor, an oxygen content sensor, a hearth pressure transmitter, a draught frequency converter, an air-blowing frequency converter, a water feed frequency converter and a fire grate frequency converter. By the aid of PLC control and by respectively controlling the draught fan, the air blower, the water feed pump and motor speed of the fire grate, the excess air coefficient is automatically adjusted.

Description

A kind of coal-burned industrial boiler excess air coefficient automatic regulating system
Technical field
The utility model belongs to field of mechanical technique, relates to a kind of boiler control equipment, particularly a kind of coal-burned industrial boiler excess air coefficient automatic regulating system.
Background technology
The energy of China's feed flow boiler consumption or conversion is mainly coal and accounts for the more than 20% of whole society's energy resource consumption total amount.2009~2010 years, what Zhejiang Province Administration of Quality and Technology Supervision tissue was 1~35t/h to 3200 specified equivalents of the whole province is all kinds of in the live efficiency simple test of use Industrial Boiler, test result is presented at by Industrial Boiler efficiency generally lower, in the middle of every loss, heat loss due to exhaust gas on average accounts for the more than 50% of total losses, wherein topmost influence factor is that the higher excess air coefficient of excess air coefficient is the burn ratio of air quality used of the air quality that enters of Actual combustion and theory, the average excess air coefficient of tested coal-fired feed flow boiler reaches 3.3, 2~3 times of best excess air coefficient.
Existing and Industrial Boiler on market (getting rid of recirculating fluidized bed and pulverized-coal fired boiler) excess air coefficient regulates relevant technology to be mainly divided into following several types automatically: one only has automatic control, without frequency conversion; Two only have frequency conversion, automatically do not control; Three have automatic control and frequency conversion, but according to the requirement of energy-saving run, do not regulate.Above-mentioned system mainly relies on manually or converter technique regulates, poor effect.
Summary of the invention
The purpose of this utility model is to have the problems referred to above for existing technology, has proposed a kind of coal-burned industrial boiler excess air coefficient automatic regulating system, and it can realize the automatic adjusting of excess air coefficient in boiler, and efficiency is high, and environmental protection more.
The purpose of this utility model can realize by following technical proposal: a kind of coal-burned industrial boiler excess air coefficient automatic regulating system, described coal-burned industrial boiler comprises drum, feed pump, fire grate, burner hearth, flue, air channel, air-introduced machine and air blast, described feed pump is connected with drum, described flue is connected with burner hearth, it is characterized in that, described air-introduced machine is connected with air blast acting in conjunction and with burner hearth, described excess air coefficient automatic regulating system comprises PLC, level sensor, drum steam pressure sensor, oxygen level sensor, furnace pressure transmitter, air inducing frequency converter, air blast frequency converter, feedwater frequency converter and fire grate frequency converter, described level sensor is arranged on drum, the signal output part of level sensor is connected with the respective signal input of PLC, described drum steam pressure sensor setting is on drum, and the signal output part of drum steam pressure sensor is connected with the respective signal input of PLC, described oxygen level sensor is arranged on flue, and the signal output part of oxygen level sensor is connected with the respective signal input of PLC, on described burner hearth, be provided with a connecting pipe, it is upper that described furnace pressure transmitter is arranged on communicating pipe, and the signal output part of furnace pressure transmitter is connected with the respective signal input of PLC, the signal output part of described PLC is connected with the control signal input of air inducing frequency converter, air blast frequency converter, feedwater frequency converter and fire grate frequency converter respectively, the control signal output of described air inducing frequency converter is connected with air-introduced machine, the control signal output of described air blast frequency converter is connected with air blast, the control signal output of described feedwater frequency converter is connected with feed pump, and the control signal output of described fire grate frequency converter is connected with fire grate.
PLC is programmable logic controller (PLC), a kind of electronic system of digital operation operation, aim in industrial environment application and design, it adopts a class programmable memory, for its internally stored program, actuating logic computing, sequential control, regularly, the user oriented instructions such as counting and arithmetical operation, and control various types of machinery or production process by numeral or analog pattern input/output, be the core of Industry Control.In the technical program, system adopts PLC to control, and input signal comprises: boiler drum water level, steam flow, steam pressure, flue gas oxygen content, exhaust gas temperature, combustion chamber draft, fire box temperature, hot blast temperature; Output signal is frequency change control signal, controls respectively air-introduced machine, air blast, the feed pump of boiler, the rotating speed of fire grate.
In above-mentioned coal-burned industrial boiler excess air coefficient automatic regulating system, on described drum, there is jet chimney, described drum steam pressure sensor setting is on jet chimney, on described jet chimney, be also provided with a steam-flow meter, the signal output part of described steam-flow meter is connected with PLC respectively.Drum steam pressure sensor and steam-flow meter are set and can strengthen the security that boiler is used, by the control bound of steam and pressure is set, when steam flow or pressure arrive in limited time above, give the alarm, automatically start fire extinguishing program simultaneously and cut off fire grate, air-introduced machine, blower motor; Reach in limited time lower, send prompting, and automatically move air-introduced machine and air blast.
In above-mentioned coal-burned industrial boiler excess air coefficient automatic regulating system, on described air channel, be provided with air preheater and hot blast temperature sensor, the signal output part of described hot blast temperature sensor is connected with the respective signal input of PLC.Air preheater has the structures such as rotary and tubular type, and its effect is to utilize the heating of the flue gas heat of boiler back end ductwork to enter boiler air, thereby has reduced flue gas loss, has improved EAT, improves the efficiency of boiler.
In above-mentioned coal-burned industrial boiler excess air coefficient automatic regulating system, on described flue, be provided with exhaust gas temperature sensor, the signal output part of described exhaust gas temperature sensor is connected with the respective signal input of PLC.Exhaust gas temperature sensor and oxygen level sensor match, and common realization detected the excess air coefficient in flue.
In above-mentioned coal-burned industrial boiler excess air coefficient automatic regulating system, in described burner hearth, be provided with fire box temperature sensor, the signal output part of described fire box temperature sensor is connected with the respective signal input of PLC.
In above-mentioned coal-burned industrial boiler excess air coefficient automatic regulating system, described excess air coefficient automatic regulating system also comprises industrial computer, and described industrial computer is connected with PLC.System can record boiler operating parameter automatically by industrial computer, can, for inquiry at any time, be the safe and economical boiler operational management data that provide the foundation.
In above-mentioned coal-burned industrial boiler excess air coefficient automatic regulating system, described excess air coefficient automatic regulating system also comprises the display being connected with industrial computer.Display is for the information of each parts operation of synthesis display boiler, and convenient operation person judges and operates.
Compared with prior art, the utlity model has following advantage: 1 is energy-conservation: system possesses automatic control excess air coefficient, frequency conversion, the functions such as frequent start-stop are avoided in steady pressure burning, than artificial adjustment, can realize coal saving rate 3%~5%, power saving rate 20%~30%, generally can recoup the investment within 1 year; 2 improve steam supply quality: system is introduced Steam pressure control, and the response time is short, make the more artificial stoker's mode of steam pressure of boiler stable, to favourable by vapour technique; 3 safety: system does not weaken the original safety protection function of boiler, and the functions such as the Steam pressure control having, water level control, hearth vacuum control are all conducive to boiler safety; 4 is automatic: system adopts the method for automatically controlling, and has alleviated fireman's labour intensity, has also reduced the requirement to fireman's energy-saving run technical ability; 5 retrospectives: it has applied industrial computer and display screen, system can record boiler operating parameter automatically, can, for inquiry at any time, be the safe and economical boiler operational management data that provide the foundation; 6, system can conveniently switch to manual operation pattern, even if thrashing does not affect boiler safety yet.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model.
Fig. 2 is systematic schematic diagram of the present utility model.
In figure, 1, burner hearth; 2, fire grate; 3, drum; 4, flue; 5, jet chimney; 6, PLC; 7, level sensor; 8, drum steam pressure sensor; 9, steam-flow meter; 10, oxygen level sensor; 11, fire box temperature sensor; 12, fire grate frequency converter; 13, air blast; 14, air-introduced machine; 15, communicating pipe; 16, furnace pressure transmitter; 17, display; 18, industrial computer; 19, air channel; 20, air preheater; 21, feedwater frequency converter; 22, air blast frequency converter; 23, air inducing frequency converter; 24, feed pump; 25, hot blast temperature sensor; 26, exhaust gas temperature sensor.
The specific embodiment
Be below specific embodiment of the utility model by reference to the accompanying drawings, the technical solution of the utility model is further described, but the utility model be not limited to these embodiment.
See figures.1.and.2, the present embodiment is a kind of coal-burned industrial boiler excess air coefficient automatic regulating system, this coal-burned industrial boiler comprises drum 3, feed pump 24, fire grate 2, burner hearth 1, flue 4, air channel 19, air-introduced machine 14 and air blast 13, air-introduced machine 14 is connected with id-motor, air blast 13 is connected with blower motor, and air-introduced machine 14 is connected with air blast 13 actings in conjunction and with burner hearth 1.Feed pump 24 is connected with drum 3, flue 4 is connected with burner hearth 1, on drum 3, there is jet chimney 5, on jet chimney 5, be provided with steam-flow meter 9, in the present embodiment, also include a drum steam pressure sensor 8, this drum steam pressure sensor 8 can be set directly on drum 3, also can be arranged on jet chimney 5, and the signal output part of drum steam pressure sensor 8 and steam-flow meter 9 is connected with PLC6 respectively.Air channel 19 is connected with burner hearth 1 and for air intake, is provided with air preheater 20 and hot blast temperature sensor 25 on air channel 19, and the signal output part of hot blast temperature sensor 25 is connected with PLC6.Flue 4, for smoke evacuation, is provided with exhaust gas temperature sensor 26 on it, the signal output part of described exhaust gas temperature sensor 26 is connected with the respective signal input of PLC6.On burner hearth 1, be also provided with a connecting pipe 15, on communicating pipe 15, be provided with for measuring the furnace pressure transmitter 16 of burner hearth 1 negative pressure.
See figures.1.and.2, this excess air coefficient automatic regulating system comprises PLC6, level sensor, oxygen level sensor 10, fire box temperature sensor 11, fire grate frequency converter 12, feedwater frequency converter 21, air blast frequency converter 22 and air inducing frequency converter 23, level sensor is arranged on drum 3, the signal output part of level sensor 7 is connected with the respective signal input of PLC6, oxygen level sensor 10 is arranged on flue 4, the signal output part of oxygen level sensor 10 is connected with the respective signal input of PLC6, fire box temperature sensor 11 is arranged in burner hearth 1, the signal output part of fire box temperature sensor 11 is connected with the respective signal input of PLC6, the signal output part of PLC6 respectively with air inducing frequency converter 23, air blast frequency converter 22, the control signal input of feedwater frequency converter 21 and fire grate frequency converter 12 is connected, the control signal output of air inducing frequency converter 23 is connected with id-motor, the control signal output of air blast frequency converter 22 is connected with blower motor.On feed pump 24, be connected with water supply pump motor, the control signal output of feedwater frequency converter 21 is connected with water supply pump motor, on fire grate 2, is connected with fire grate, and the control signal output of fire grate frequency converter 12 is connected with fire grate.Excess air coefficient automatic regulating system also comprises display 17 and industrial computer 18, and display 17 is connected with PLC6 respectively with industrial computer 18, for showing and record the ruuning situation of boiler.
The control principle of the present embodiment is as follows:
1, boiler drum water level is controlled:
Boiler drum water level control module is relatively independent, according to SEA LEVEL VARIATION, automatically adjusts water supply pump motor frequency, realizes permanent water level and controls.Permanent water level was controlled while losing efficacy, and carried out safety protection program, and gave the alarm: as arrived high water level, directly cut off water supply pump motor; As arrive low water level, cut off fire grate, air-introduced machine, blower motor.
Safety during for assurance thrashing, water level is controlled and can be carried out artificial/automatic switchover.
2, Steam pressure control
First control bound is set, and generally according to technological requirement setting, the upper limits pressure that technique allows must not be lower than the maximum pressure of safe operation of the boiler.In arrival, in limited time, give the alarm, automatically start fire extinguishing program (cutting off fire grate, air-introduced machine, blower motor) simultaneously; Reach in limited time lower, send prompting, and automatically move air-introduced machine and air blast.Optimized operation pressure is set again, when steam pressure is during higher than optimized operation pressure, means that fuel consumption speed is too high, now reduce fire grate frequency and reduce coal-fired input speed; When steam pressure is during lower than optimized operation pressure, above-mentioned control action is contrary.
3, excess air coefficient (oxygen content) is controlled
Excess air coefficient is realized by measuring and control oxygen content of smoke gas.After coal-fired input speed reduces, after time delay a period of time, can predict oxygen content of smoke gas increases gradually, mean that excess air coefficient is excessive, so reduce id-motor and blower motor frequency by program, make oxygen content of smoke gas (air quantity) be reduced to appropriate amount.After coal-fired input speed improves, above-mentioned control action is contrary.Flue gas oxygen content is controlled target generally need select optimum value according to ature of coal and tail flue gas carbon monoxide content, is generally 7%~10%.Too low meeting affect normal combustion, and smoke evacuation carbon monoxide content is high, has certain potential safety hazard; Too high, can be minimum according to incomplete combustion loss and flue gas loss summation, choose suitable smoke evacuation Control for Oxygen Content desired value.
During boiler ignition start, oxygen content of smoke gas is higher, and as by above-mentioned control, id-motor and blower motor frequency are all very low, to such an extent as to cannot normal ignition, so ignition phase should switch to manual control.After operation a period of time, oxygen content is reduced to certain limit gradually, think that igniting completes, then manual switching enters automatic control mode.
4, hearth vacuum control
Hearth vacuum control value is generally-20~-40Pa, adopts integration to average as combustion chamber draft measured value.Synchronous id-motor and the blower motor frequency adjusted, can realize gradually combustion chamber draft trend and control desired value.As combustion chamber draft is difficult to adjust to control desired value all the time, should checks and repair boiler seal performance, otherwise adjust negative pressure controlling value.
Different boilers, there is larger difference in the response that combustion chamber draft is regulated, likely cause combustion chamber draft dependence system completely to automatically adjust to reach control target, now need air blast throttle opening to regulate, using supplementing of regulating as combustion chamber draft.Compared with cauldron, air blast throttle opening regulates and has generally been connected to switch board, during the system reform, draws and connects.
Native system adopts PLC to control, and input signal comprises: boiler drum water level, steam flow, steam pressure, flue gas oxygen content, exhaust gas temperature, combustion chamber draft, fire box temperature, hot blast temperature; Output signal is frequency change control signal, control respectively air-introduced machine 14, air blast 12, the feed pump 24 of boiler, the motor speed of fire grate 2, wherein hot blast temperature sensor 25, exhaust gas temperature sensor 26, fire box temperature sensor 11, steam-flow meter 9 are only for management, be not used in control, they do not affect the integrality of native system, can be according to user management requirement, apolegamy voluntarily.
Specific embodiment described herein is only to the explanation for example of the utility model spirit.The utility model person of ordinary skill in the field can make various modifications or supplements or adopt similar mode to substitute described specific embodiment, but can't depart from spirit of the present utility model or surmount the defined scope of appended claims.
Although more used burner hearth 1 herein, fire grate 2, drum 3, flue 4, jet chimney 5, PLC6, level sensor 7, drum steam pressure sensor 8, steam-flow meter 9, oxygen level sensor 10, fire box temperature sensor 11, fire grate frequency converter 12, air blast 13, air-introduced machine 14, communicating pipe 15, furnace pressure transmitter 16, display 17, industrial computer 18, air channel 19, air preheater 20, feedwater frequency converter 21, air blast frequency converter 22, air inducing frequency converter 23, feed pump 24, hot blast temperature sensor 25, exhaust gas temperature sensor 26 terms such as grade, but do not get rid of the possibility of using other term.Use these terms to be only used to describe more easily and explain essence of the present utility model; They are construed to any additional restriction is all contrary with the utility model spirit.

Claims (7)

1. a coal-burned industrial boiler excess air coefficient automatic regulating system, described coal-burned industrial boiler comprises drum (3), feed pump (24), fire grate (2), burner hearth (1), flue (4), air channel (19), air-introduced machine (14) and air blast (13), described feed pump (24) is connected with drum (3), described flue (4) is connected with burner hearth (1), it is characterized in that, described air-introduced machine (14) is connected with air blast (13) acting in conjunction and with burner hearth (1), described excess air coefficient automatic regulating system comprises PLC (6), level sensor (7), drum steam pressure sensor (8), oxygen level sensor (10), furnace pressure transmitter (16), air inducing frequency converter (23), air blast frequency converter (22), feedwater frequency converter (21) and fire grate frequency converter (12), described level sensor (7) is arranged on drum (3), the signal output part of level sensor (7) is connected with the respective signal input of PLC (6), it is upper that described drum steam pressure sensor (8) is arranged on drum (3), and the signal output part of drum steam pressure sensor (8) is connected with the respective signal input of PLC (6), it is upper that described oxygen level sensor (10) is arranged on flue (4), and the signal output part of oxygen level sensor (10) is connected with the respective signal input of PLC (6), on described burner hearth (1), be provided with a connecting pipe (15), it is upper that described furnace pressure transmitter (16) is arranged on communicating pipe (15), and the signal output part of furnace pressure transmitter (16) is connected with the respective signal input of PLC (6), the signal output part of described PLC (6) is connected with the control signal input of fire grate frequency converter (12) with air inducing frequency converter (23), air blast frequency converter (22), feedwater frequency converter (21) respectively, the control signal output of described air inducing frequency converter (23) is connected with air-introduced machine (14), the control signal output of described air blast frequency converter (22) is connected with air blast (13), the control signal output of described feedwater frequency converter (21) is connected with feed pump (24), and the control signal output of described fire grate frequency converter (12) is connected with fire grate (2).
2. coal-burned industrial boiler excess air coefficient automatic regulating system according to claim 1, it is characterized in that, on described drum (3), there is jet chimney (5), described drum steam pressure sensor (8) is arranged on jet chimney (5), on described jet chimney (5), be also provided with a steam-flow meter (9), the signal output part of described steam-flow meter (9) is connected with PLC (6) respectively.
3. coal-burned industrial boiler excess air coefficient automatic regulating system according to claim 1, it is characterized in that, on described air channel (19), be provided with air preheater (20) and hot blast temperature sensor (25), the signal output part of described hot blast temperature sensor (25) is connected with the respective signal input of PLC (6).
4. coal-burned industrial boiler excess air coefficient automatic regulating system according to claim 1, it is characterized in that, on described flue (4), be provided with exhaust gas temperature sensor (26), the signal output part of described exhaust gas temperature sensor (26) is connected with the respective signal input of PLC (6).
5. coal-burned industrial boiler excess air coefficient automatic regulating system according to claim 1, it is characterized in that, in described burner hearth (1), be provided with fire box temperature sensor (11), the signal output part of described fire box temperature sensor (11) is connected with the respective signal input of PLC (6).
6. according to the coal-burned industrial boiler excess air coefficient automatic regulating system described in claim 1 or 2 or 3 or 4 or 5, it is characterized in that, described excess air coefficient automatic regulating system also comprises industrial computer (18), and described industrial computer (18) is connected with PLC (6).
7. coal-burned industrial boiler excess air coefficient automatic regulating system according to claim 6, is characterized in that, described excess air coefficient automatic regulating system also comprises the display (17) being connected with industrial computer (18).
CN201420221678.8U 2014-04-30 2014-04-30 Automatic excess-air-coefficient adjusting system of industrial coal-fired boiler Active CN203810367U (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105605609A (en) * 2015-05-05 2016-05-25 大唐贵州野马寨发电有限公司 Thermal power plant boiler combustion oxygen amount optimizing method
CN107246606A (en) * 2017-07-24 2017-10-13 北京硕人时代科技股份有限公司 The progress control method and control system of grate firing boiler
CN109059038A (en) * 2018-07-25 2018-12-21 西安交大思源科技股份有限公司 A kind of automatic combustion control device of Industrial Boiler
CN110207398A (en) * 2018-12-13 2019-09-06 华帝股份有限公司 The control method of adaptive full premix combustion for gas heater
CN110207399A (en) * 2018-12-13 2019-09-06 华帝股份有限公司 The control method of adaptive full premix combustion

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105605609A (en) * 2015-05-05 2016-05-25 大唐贵州野马寨发电有限公司 Thermal power plant boiler combustion oxygen amount optimizing method
CN105605609B (en) * 2015-05-05 2018-06-29 大唐贵州野马寨发电有限公司 A kind of power plant boiler burning oxygen amount optimization method
CN107246606A (en) * 2017-07-24 2017-10-13 北京硕人时代科技股份有限公司 The progress control method and control system of grate firing boiler
CN109059038A (en) * 2018-07-25 2018-12-21 西安交大思源科技股份有限公司 A kind of automatic combustion control device of Industrial Boiler
CN110207398A (en) * 2018-12-13 2019-09-06 华帝股份有限公司 The control method of adaptive full premix combustion for gas heater
CN110207399A (en) * 2018-12-13 2019-09-06 华帝股份有限公司 The control method of adaptive full premix combustion

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