CN202709171U - Combustion control system for coal-fired steam boiler - Google Patents
Combustion control system for coal-fired steam boiler Download PDFInfo
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- CN202709171U CN202709171U CN 201220362435 CN201220362435U CN202709171U CN 202709171 U CN202709171 U CN 202709171U CN 201220362435 CN201220362435 CN 201220362435 CN 201220362435 U CN201220362435 U CN 201220362435U CN 202709171 U CN202709171 U CN 202709171U
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Abstract
The utility model discloses a combustion control system for a coal-fired steam boiler. The combustion control system for the coal-fired steam boiler comprises a master controller, a vapor pressure sensor, an oxygen content sensor, a stove ash temperature sensor, a grate transducer and a blast transducer; the input end of the master controller is respectively connected with the stove ash temperature sensor, the vapor pressure sensor and the oxygen content sensor; the stove ash temperature sensor is arranged inside a hearth of a vapor boiler; the vapor pressure sensor is arranged on a vapor pipeline; the oxygen content sensor is arranged on an exhaust air duct, and the output end of the master controller is respectively connected with the grate transducer and the blast transducer.
Description
Technical field
The utility model relates to a kind of boiler control equipment, relates in particular to the combustion control system that a kind of coal-fired steam boiler is used.
Background technology
The function of coal-fired steam boiler namely is as the energy with coal, the water heating is generated the water vapour of certain pressure, produce more steam in order to save the coal that the energy namely wants boiler to burn as best one can still less, allow the more reasonable and efficient burning of boiler just become one of core missions of boiler control.
The control method that the burning of present coal-burning boiler is on the market adopted is to form single loop with steam pressure and the blow rate required to control target vapor pressure basically, it is given by a certain percentage that fire grate is followed air blast as air blast by momentum, and some high-end boiler also can be introduced flue gas oxygen content and revise as control.Such control method owing to affect the many factors of oxygen content, seals bad etc. in actual applications such as burner hearth, the oxygen content of smoke gas of measuring can characterize the complete ability of burning and will have a greatly reduced quality, make in actual use, although Control for Oxygen Content in certain limit, in fact air supply is not enough, burning is also insufficient, wasted unnecessary fire coal, or excessive burning, air supply is too many, surplus air can be taken away too much heat, and boiler thermal output is reduced.
Summary of the invention
The utility model provides a kind of coal-fired steam boiler combustion control system of a kind of temperature (being the ashes temperature) by increasing the fire grate afterbody as another auxiliary controlled volume, the control of this system's coal-air ratio is not only with reference to oxygen content of smoke gas, the ashes temperature is controlled coal-air ratio as the feedforward amount, react so more accurately burning of coal state in the burner hearth, improve control accuracy and stability.
The utility model specifically is achieved through the following technical solutions: a kind of coal-fired steam boiler combustion control system, described coal-fired steam boiler comprises burner hearth, fire grate, the pot bucket, smokejack and main steam pipe, it comprises described combustion control system: master controller, the steam pressure sensor, oxygen level sensor, the ashes temperature sensor, fire grate frequency converter and air blast frequency converter, described steam pressure installation of sensors is on the main steam pipe of described coal-fired steam boiler, the signal output part of steam pressure sensor links to each other with the respective signal input of master controller, described oxygen level sensor is installed on the smokejack of described coal-fired steam boiler, the signal output part of oxygen level sensor links to each other with the respective signal input of master controller, described ashes temperature sensor is installed in the burner hearth of described coal-fired steam boiler, the signal output part of ashes temperature sensor links to each other with the respective signal input of master controller, and the signal output part of master controller links to each other with the control signal input of fire grate frequency converter and air blast frequency converter respectively.
Described master controller comprises steam pressure PID control module and oxygen content of smoke gas PID control module, the input of described steam pressure PID control module links to each other with the signal output part of steam pressure sensor, the signal output part of steam pressure PID control module links to each other with the control signal input of fire grate frequency converter, one input of described oxygen content of smoke gas PID control module links to each other with the signal output part of oxygen level sensor, another input of oxygen content of smoke gas PID control module links to each other with the signal output part of ashes temperature sensor, and the signal output part of oxygen content of smoke gas PID control module links to each other with the control signal input of air blast frequency converter.PID is a kind of circuit controls Mathematical Modeling, its implication: P-proportion control, I-integration control, D-differential control.
Described fire grate frequency converter links to each other with blower motor with fire grate respectively by circuit with the air blast frequency converter, controls the rotating speed of corresponding motor, thus defeated coal stove is arranged in the control burner hearth the speed of travel (coal-supplying amount) and the blow rate required.What described master controller adopted is programmable logic controller (PLC) (being the PLC controller).What described ashes temperature sensor adopted is thermocouple.
The beneficial effects of the utility model are: overcome traditional and controlled target vapor pressure because steam pressure and the blow rate required form single loop, owing to the inaccurate drawback that affects sufficient combustion of measurement of oxygen content, effectively raised the efficient of boiler combustion.
Description of drawings
Fig. 1 is the overall schematic that a kind of coal-fired steam boiler of the present utility model is used combustion control system.
Fig. 2 is the control principle block diagram that a kind of coal-fired steam boiler of the present utility model is used combustion control system.
Among the figure: 1-burner hearth, 2-fire grate, 3-pot bucket, 4-smokejack, 5-main steam pipe, 6-master controller, 7-steam pressure sensor, 8-oxygen level sensor, 9-ashes temperature sensor, 10-fire grate frequency converter, 11-air blast frequency converter.
The specific embodiment
Such as Fig. 1, shown in 2, a kind of coal-fired steam boiler combustion control system, described coal-fired steam boiler comprises burner hearth 1, fire grate 2, pot bucket 3, smokejack 4 and main steam pipe 5, it comprises described combustion control system: master controller 6, steam pressure sensor 7, oxygen level sensor 8, ashes temperature sensor 9, fire grate frequency converter 10 and air blast frequency converter 11, described steam pressure sensor 10 is installed on the main steam pipe 5 of described coal-fired steam boiler, the signal output part of steam pressure sensor 10 links to each other with the respective signal input of master controller 6, described oxygen level sensor 8 is installed on the smokejack 4 of described coal-fired steam boiler, the signal output part of oxygen level sensor 8 links to each other with the respective signal input of master controller 6, described ashes temperature sensor 9 is installed in the burner hearth 1 of described coal-fired steam boiler, the signal output part of ashes temperature sensor 9 links to each other with the respective signal input of master controller 6, and the signal output part of master controller 6 links to each other with the control signal input of fire grate frequency converter 10 and air blast frequency converter 11 respectively.Control the rotating speed of corresponding motor, thus defeated coal stove is arranged in the control burner hearth the speed of travel (being coal-supplying amount) and the blow rate required.
When this control of coal device work, steam pressure sensor 7 on the main steam pipe 5 inputs to the main steam pressure that is measured to one input port of master controller 6, master controller 6 is compared this force value with the main steam pressure setting value (working condition pressure desired value) on the master controller 6, after carrying out the PID mathematical operation, obtain fire grate rotating speed (coal-supplying amount) control signal, this control signal is transferred to fire grate frequency converter 10 adjustment fire grate gait of march by an output port of master controller 6, thereby the control coal-supplying amount, making has enough fuel to be used for combustion heating steam pressure is reached and to be stabilized in setting value in the burner hearth 1.
Again because corresponding coal amount is fully burnt, must provide enough air quantity (being amount of oxygen), the control of this air quantity realizes by following loop: the oxygen content of smoke gas that the oxygen quantity sensor 8 on the smokejack 4 is measured inputs to another input port of master controller 6, master controller 6 is compared this oxygen content value with the oxygen content setting value (operating mode oxygen amount desired value) on the master controller 6, after carrying out the PID mathematical operation, obtain the air blast inverter control signal, this control signal is transferred to air blast frequency converter 11 adjustment blast velocities by another output port of master controller 6, thereby control is to air quantity, make the oxygen content of smokejack 4 be stabilized in its setting value, the fuel in the burner hearth 1 can fully be burnt.Measure simultaneously fluctuation and the inaccuracy of oxygen content for overcoming oxygen level sensor 8, we are the feedforward of oxygen content of smoke gas pid control circuit with the ashes temperature as the foundation that characterizes sufficient combustion, measure the 3rd input port of ashes temperature input master controller by ashes temperature sensor 9, master controller 6 is undertaken the ashes temperature to go to revise after the computing by pre-determined Mathematical Modeling the setting value of oxygen content, makes the desired value of oxygen content more can characterize combustion position in the burner hearth.
Claims (5)
1. coal-fired steam boiler combustion control system, described coal-fired steam boiler comprises burner hearth (1), fire grate (2), pot bucket (3), smokejack (4) and main steam pipe (5), it is characterized in that described combustion control system comprises: master controller (6), steam pressure sensor (7), oxygen level sensor (8), ashes temperature sensor (9), fire grate frequency converter (10) and air blast frequency converter (11), described steam pressure sensor (7) is installed on the main steam pipe (5) of described coal-fired steam boiler, the signal output part of steam pressure sensor (7) links to each other with the respective signal input of master controller (6), described oxygen level sensor (8) is installed on the smokejack (4) of described coal-fired steam boiler, the signal output part of oxygen level sensor (8) links to each other with the respective signal input of master controller (6), described ashes temperature sensor (9) is installed in the burner hearth (1) of described coal-fired steam boiler, the signal output part of ashes temperature sensor (9) links to each other with the respective signal input of master controller (6), and the signal output part of master controller (6) links to each other with the control signal input of fire grate frequency converter (10) with air blast frequency converter (11) respectively.
2. a kind of coal-fired steam boiler combustion control system according to claim 1, it is characterized in that: described master controller (6) comprises steam pressure PID control module and oxygen content of smoke gas PID control module, the input of described steam pressure PID control module links to each other with the signal output part of steam pressure sensor (7), the signal output part of steam pressure PID control module links to each other with the control signal input of fire grate frequency converter (10), one input of described oxygen content of smoke gas PID control module links to each other with the signal output part of oxygen level sensor (8), another input of oxygen content of smoke gas PID control module links to each other with the signal output part of ashes temperature sensor (9), and the signal output part of oxygen content of smoke gas PID control module links to each other with the control signal input of air blast frequency converter (11).
3. a kind of coal-fired steam boiler combustion control system according to claim 1, it is characterized in that: described fire grate frequency converter (10) links to each other with blower motor with fire grate respectively by circuit with air blast frequency converter (11), controls the rotating speed of corresponding motor.
4. a kind of coal-fired steam boiler combustion control system according to claim 1 is characterized in that: what described master controller (6) adopted is programmable logic controller (PLC).
5. a kind of coal-fired steam boiler combustion control system according to claim 1 is characterized in that: what described ashes temperature sensor (9) adopted is thermocouple.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220362435 CN202709171U (en) | 2012-07-25 | 2012-07-25 | Combustion control system for coal-fired steam boiler |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220362435 CN202709171U (en) | 2012-07-25 | 2012-07-25 | Combustion control system for coal-fired steam boiler |
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| CN202709171U true CN202709171U (en) | 2013-01-30 |
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| CN 201220362435 Expired - Lifetime CN202709171U (en) | 2012-07-25 | 2012-07-25 | Combustion control system for coal-fired steam boiler |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103234190A (en) * | 2013-05-13 | 2013-08-07 | 北京和隆优化科技股份有限公司 | Energy-saving optimization control system for chain-grate boiler |
| CN103335315A (en) * | 2013-06-18 | 2013-10-02 | 浙江睿洋科技有限公司 | Garbage pyrolysis and incineration device and working method thereof |
| CN103591605A (en) * | 2013-11-30 | 2014-02-19 | 广州广重企业集团有限公司 | Combustion monitoring control system of waste wood fuel boiler using non-pre-treatment technology |
| CN104819482A (en) * | 2015-05-08 | 2015-08-05 | 南通长航船舶配件有限公司 | Grate adjusting circuit for ship boiler combustion adjusting system |
| CN105387452A (en) * | 2015-12-14 | 2016-03-09 | 嘉兴华清能源科技有限公司 | Biomass particle combustion boiler system capable of realizing automatic control |
| CN108613215A (en) * | 2018-05-31 | 2018-10-02 | 佛山市绿威生物科技有限公司 | A kind of biomass boiler control device and its control method |
| CN111057584A (en) * | 2019-12-27 | 2020-04-24 | 长沙万利节能科技有限公司 | System and method for controlling steam production of biomass gasification furnace combined boiler |
| CN111765446A (en) * | 2020-07-07 | 2020-10-13 | 浙江力聚热水机有限公司 | Boiler control method and system based on automatic optimization fuzzy three-level PID |
-
2012
- 2012-07-25 CN CN 201220362435 patent/CN202709171U/en not_active Expired - Lifetime
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103234190A (en) * | 2013-05-13 | 2013-08-07 | 北京和隆优化科技股份有限公司 | Energy-saving optimization control system for chain-grate boiler |
| CN103234190B (en) * | 2013-05-13 | 2014-12-03 | 北京和隆优化科技股份有限公司 | Energy-saving optimization control system for chain-grate boiler |
| CN103335315A (en) * | 2013-06-18 | 2013-10-02 | 浙江睿洋科技有限公司 | Garbage pyrolysis and incineration device and working method thereof |
| CN103335315B (en) * | 2013-06-18 | 2015-09-23 | 浙江睿洋科技有限公司 | Refuse pyrolysis incinerator and method of work thereof |
| CN103591605A (en) * | 2013-11-30 | 2014-02-19 | 广州广重企业集团有限公司 | Combustion monitoring control system of waste wood fuel boiler using non-pre-treatment technology |
| CN103591605B (en) * | 2013-11-30 | 2016-06-08 | 广州广重企业集团有限公司 | A kind of combustion monitoring Controlling System without pretreatment technology waste wood fuel boiler |
| CN104819482A (en) * | 2015-05-08 | 2015-08-05 | 南通长航船舶配件有限公司 | Grate adjusting circuit for ship boiler combustion adjusting system |
| CN105387452A (en) * | 2015-12-14 | 2016-03-09 | 嘉兴华清能源科技有限公司 | Biomass particle combustion boiler system capable of realizing automatic control |
| CN108613215A (en) * | 2018-05-31 | 2018-10-02 | 佛山市绿威生物科技有限公司 | A kind of biomass boiler control device and its control method |
| CN111057584A (en) * | 2019-12-27 | 2020-04-24 | 长沙万利节能科技有限公司 | System and method for controlling steam production of biomass gasification furnace combined boiler |
| CN111765446A (en) * | 2020-07-07 | 2020-10-13 | 浙江力聚热水机有限公司 | Boiler control method and system based on automatic optimization fuzzy three-level PID |
| CN111765446B (en) * | 2020-07-07 | 2021-11-02 | 浙江力聚热水机有限公司 | Boiler control method and system based on automatic optimization fuzzy three-level PID |
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Granted publication date: 20130130 |