CN101338910A - Oxygen-enriched and all-oxygen combustion roller kiln combustion control method - Google Patents
Oxygen-enriched and all-oxygen combustion roller kiln combustion control method Download PDFInfo
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- CN101338910A CN101338910A CNA2008100487835A CN200810048783A CN101338910A CN 101338910 A CN101338910 A CN 101338910A CN A2008100487835 A CNA2008100487835 A CN A2008100487835A CN 200810048783 A CN200810048783 A CN 200810048783A CN 101338910 A CN101338910 A CN 101338910A
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
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Abstract
The invention discloses a method for controlling the combustion of an oxygen-enriched and full-oxygen combustion roller kiln, a pulse-combustion control method. The mixture ratio of the oxygen and the fuel gas is automatically adjusted by the separate closed-loop feedback control of oxygen and fuel gas, and meanwhile, the mixture ratio is corrected by real-time controlled variable according to the burnt curve; subsequently, under the action of the two signals, the fuel gas and the oxygen actuator adjusts in real-time the fuel gas valve and the oxygen valve, and realize and maintain the preset optimal combustion control ratio; a supervisory computer is used to sample and process the kiln in real-time, then the given quantity of pulse duty-ratio confirmed by the burnt curve is corrected to achieve the real-time controlled variable; and finally, the actuator is controlled and adjusted by the pulse manipulator in real-time to achieve optimal combustion control. The invention is highly efficient, energy-saving, environment-friendly, etc. The oxygen in the combustion atmosphere in the kiln can be kept at more than 21 percent of the volume content and is mixed with fuel gas for combustion; in addition, the proportions of the oxygen and the fuel gas as well as the combustion time are adjusted automatically.
Description
Technical field
The present invention relates to Industrial Stoves method for controlling combustion field, particularly relate to a kind of burning ratio that is used for regulating automatically combustion gas and oxygen mixture in oxygen enrichment and the all-oxygen combustion ceramic roller kiln combustion process, comprise pure oxygen as combustion-supporting gas with high concentration oxygen, the control method of utilization pulse-combustion control mode.
Background technology
Domestic ceramic kiln generally all adopts the form of continuous burning control at present, and promptly the size by control fuel, combustion air flow makes temperature, combustion atmosphere in the stove reach technological requirement.Because the mode of this continuous burning control often is subjected to the restriction of links such as the adjusting of fuel flow rate and measurement, the control poor effect of present most of kilns.And the high-grade ceramic goods are had relatively high expectations to the uniformity of kiln temperature field and the reliability of combustion atmosphere, use traditional continuous burning control can't realize the production demand.The pulse-combustion technology is a kind of novel Industrial Stoves combustion control technology, it has favorable applicability to the different fuel medium, be not subjected to the measurement of fuel quantity and the restriction of governing loop, the large-scale kiln very serious in the hysteresis quality of temperature rise and fall all can reach desirable temperature control curve, is better than traditional continuous burning control more.
Oxygen accounts for 20.94% in the air main component, and nitrogen accounts for 78.09%.In the ceramic roller kiln sintering process, have only oxygen and fuel to participate in reaction, and nitrogen only exists in the air as diluent, make oxygen and fuel contact-making surface reduce, cause incomplete combustion, it is inhomogeneous to be heated, and is easy to generate localized hyperthermia, and this will help nitrogen and at high temperature generate a large amount of NO with oxygen reaction
xThereby, cause the bump probability of reaction of oxygen and fuel to reduce greatly again.It is external that the flue gas that is produced carries a large amount of heat discharge kilns, causes a large amount of thermal loss, thereby reduced the thermal efficiency of ceramic roller kiln.
At the problem of above existence, oxygen enrichment and pure oxygen combustion technology are good solutions, and the pulse-combustion control mode then can solve continuous burning control deficiency aborning.For this reason, someone has proposed a kind of " oxygen enrichment and all-oxygen combustion roller kiln " (CN101182217), these roller kilns are that a kind of to be at least 21% oxygen with volumetric concentration be that combustion-supporting medium burns in burner with fuel, and do not need the oxygen enrichment and the all-oxygen combustion roller kiln of air-breathing blower fan.This roller kilns thermal efficiency height, the combustion product amount that is produced is than reducing during for combustion-supporting medium more than 50% with the air, and the nitrogen oxide of generation also reduces greatly, and energy consumption can reduce more than 10%, and can drop to minimum point to the emission of harmful substances amount.Yet this patent documentation is not analyzed the best point of the mixed combustion ratio of combustion gas and combustion-supporting gas, does not propose how this automatically adjusts to this best point yet.At " the two ratio combustion control devices of high-temperature fuel gas periodic kilns the kiln " that patent documentation is announced (CN2869606) in the technical scheme, a kind of two ratio method for controlling combustion of periodic kilns the kiln have been proposed, this method is by being provided with the connecting line and the air/fuel aspect ratio adjusting method of different tube diameters between each burner and combustion gas house steward, thereby adjust multiple different burning ratio, it can solve easy fired temperature control difficulty, what can guarantee also that high temperature burns till carries out smoothly, save fuel, guaranteed firing process.Yet realize this ratio adjusting, different caliber connecting lines need be set, will make that the pipeline of this method is very complicated, increased the cost of this method if regulate multiple different burning ratio.And the adjusting of combustion-supporting gas of present stage kiln and combustion gas is generally adjusted open loop, can only regulate in strict accordance with the ratio of sintering curve in host computer or the controller, can not in certain scope, carry out the part fine setting, better meet technology with this and burn till requirement.
Under the policy of national energy-saving and emission-reduction, characteristics in conjunction with oxygen enrichment and all-oxygen combustion roller kiln and The pulse burning control technique, how to promote the combustibility of ceramic roller kiln, improve its fuel factor, save the energy? obviously The pulse burning control technique is applied to thisly comprise in the new ceramics roller kilns that pure oxygen burns as combustion-supporting medium and combustion gas mixing with high concentration oxygen, can better satisfy the combustibility that promotes roller kilns, the requirement that improves its fuel factor and save the energy, and utilization negative-feedback control technology is finely tuned and can better be satisfied technology and burn till requirement in the ratio of oxygen and combustion gas is regulated.Therefore, a kind of oxygen enrichment and all-oxygen combustion ceramic roller kiln pulse-combustion control method that comprises combustion oxygen ratio adjusting FEEDBACK CONTROL link of research has great engineering practice meaning.
Summary of the invention
Technical problem to be solved by this invention is: a kind of burning that utilizes the pulse-combustion technology to control oxygen enrichment and all-oxygen combustion roller kiln is provided, oxygen concentration in the kiln internal combustion atmosphere is remained on more than 21% and with combustion gas mixing burns, automatically it is best regulating the mixed combustion ratio simultaneously, improve the fuel factor of roller kilns, to realize energy-saving and emission-reduction and to improve the quality of burning till product.
The technical scheme that the present invention solves its technical problem is: adopt the pulse-combustion control method, it is to burn more than 21% and with combustion gas mixing that oxygen in the described roller kilns internal combustion atmosphere is remained on volume content, regulates the ratio and the burning time of oxygen and combustion gas simultaneously automatically.Specifically:
(1) by oxygen and combustion gas closed loop feedback control separately, the mixed proportion parameter of regulating oxygen and combustion gas automatically; According to the real time information of kiln atmosphere and temperature,, obtain the real-time controlled quentity controlled variable of combustion gas and oxygen specified rate simultaneously to revising by determined combustion gas of sintering curve and oxygen specified rate;
(2) under the acting in conjunction of above-mentioned two kinds of controlled quentity controlled variable signals, Gas controller and oxygen controller are regulated gas valve and oxygen valve in real time by actuator separately, realize and keep predefined best combustion control ratio;
(3) utilize host computer sampling and in the kiln in real time, the pulse duty factor specified rate that sintering curve is determined is revised, obtain real-time controlled quentity controlled variable behind the combustion atmosphere and temperature information Treatment Analysis that are obtained;
(4) the real-time controlled quentity controlled variable signal that obtains according to feedback to the burning time of the gaseous mixture of the control in real time of described actuator and adjusting combustion gas and oxygen or the ratio of shared time of big fire, is realized best combustion control by impulse controller.
The present invention compared with prior art has following advantage:
1. the mixed combustion ratio of oxygen and combustion gas is revised after extracting the atmosphere parameter in the ceramic roller kiln again, via controller is handled the flow that back control actuator is regulated gas in the gas valve of combustion gas and oxygen, reach a kind of actual burning ratio of producing that meets most with this, make that the interior combustion of mixed gas of kiln is more abundant, saved the energy.
2. adopt novel pulse-combustion control method, the burn rate height can be rapidly heated.And the big and small fire intermittent action makes to form strong agitation in the whole temperature field, makes the kiln temperature field more even, and the quality of burning till of product is guaranteed.
3. the The whole control method is simple, and the functional reliability height adopts industrial computer as controller, be convenient to carry out communication and data transmission with host computer, can improve the automaticity of whole Kiln Control System, alleviate operating personnel's working strength, exempt unnecessary manpower waste.
Description of drawings
Fig. 1 is the mixed proportion pulse-combustion control method system construction drawing of oxygen of the present invention and combustion gas.
Among the figure: 1. Gas controller; 2. oxygen controller; 3. first actuator; 4. second actuator; 5. gas valve; 6. oxygen valve; 7. impulse controller; 8. the 3rd actuator; 9. burner; 10. host computer; 11. kiln body.
The specific embodiment
The method for controlling combustion of oxygen enrichment provided by the invention and all-oxygen combustion roller kiln is: adopt the pulse-combustion control method, it is to burn more than 21% and with combustion gas mixing that oxygen in the described roller kilns internal combustion atmosphere is remained on volume content, regulates the ratio and the burning time of oxygen and combustion gas simultaneously automatically.Specific as follows:
(1) by oxygen and combustion gas closed loop feedback control separately, the mixed proportion parameter of regulating oxygen and combustion gas automatically; According to the real time information of kiln atmosphere and temperature,, obtain the real-time controlled quentity controlled variable of combustion gas and oxygen specified rate simultaneously to revising by determined combustion gas of sintering curve and oxygen specified rate;
(2) under the acting in conjunction of above-mentioned two kinds of controlled quentity controlled variable signals, Gas controller and oxygen controller are regulated gas valve and oxygen valve in real time by actuator separately, realize and keep predefined best combustion control ratio;
(3) utilize host computer sampling and in the kiln in real time, the pulse duty factor specified rate that sintering curve is determined is revised, obtain real-time controlled quentity controlled variable behind the combustion atmosphere and temperature information Treatment Analysis that are obtained;
(4) the real-time controlled quentity controlled variable signal that obtains according to feedback to the burning time of the gaseous mixture of the control in real time of described actuator and adjusting combustion gas and oxygen or the ratio of shared time of big fire, is realized best combustion control by impulse controller.
When the ratio of the burning time of regulating combustion gas and the gaseous mixture of oxygen or shared time of big fire, use pulse modulation technology, so that realization pulse-combustion control mode.
Described Gas controller, oxygen controller and impulse controller all adopt industrial Programmable Logic Controller, they with host computer between all adopt the RS-232 communication modes to be connected.Host computer can adopt PC.
The invention will be further described below in conjunction with accompanying drawing.
As shown in Figure 1: the present invention has adopted the device that comprises that Gas controller 1, oxygen controller 2, impulse controller 7, first actuator 3, second actuator 4, the 3rd actuator 8 and host computer 10 are formed, to the burning realization pulse-combustion control mode of kiln body 11.
Described kiln body 11 is meant " oxygen enrichment and all-oxygen combustion ceramic roller kiln " (CN101182217), this ceramic roller kiln comprises preheating zone, firing zone, fuel and combustion-supporting medium induction system, smoke evacuation system, quench zone, cooling area, temperature control system, combustion system, waste heat system, it can realize that being at least 21% oxygen with volumetric concentration is that combustion-supporting medium burns in burner with fuel, and does not need the air-breathing blower fan.
In oxygen enrichment and all-oxygen combustion ceramic roller kiln, the present invention regulates the burning ratio of oxygen and combustion gas to a best automatically by the closed loop feedback control and regulation method separately of oxygen and combustion gas.
In described closed loop feedback control and regulation method, utilize the flow sensor be arranged in combustion gas and the oxygen channel to measure the flow G of combustion gas and oxygen in the real-time pipeline
p, O
p, with the preset flow G in Gas controller 1 and the oxygen controller 2
q, O
qCompare, obtain current time combustion gas and oxygen flow G after the correction
o, O
o, Gas controller 1 and oxygen controller 2 are according to G
o, O
oRegulate the gas flow of gas valve 5, oxygen valve 6; And in actual production process, the controlled quentity controlled variable that can obtain combustion gas and oxygen according to sintering curve is respectively G
g, O
g, parameters such as combustion atmosphere, temperature and oxygen are input in the host computer 10, and through atmosphere adjustment analysis and parameter correction, the correction that obtains real-time combustion gas and oxygen is respectively G
t, O
t, specified rate G
g, O
gWith correction G
t, O
t, the combustion gas specified rate G of formation current time under the acting in conjunction of these parameters
sWith oxygen specified rate O
sWith G
sAnd O
sBe input in Gas controller 1 and the oxygen controller 2, with control first actuator 3, second actuator 4 is regulated the gas flow of gas valve 5, oxygen valve 6, control the flow of the air mixture of combustion gas and oxygen jointly with this, thereby reach a kind of actual mixture combustion ratio of producing that meets most.
Described combustion-supporting gas, the content concn of its oxygen are 21% to 99%, and the content concn of nitrogen is at least less than 15%.
By the gaseous mixture that oxygen and combustion gas constitute, its combustion control mode is the pulse-combustion control mode, adopts pulse modulation technology to realize, that is: temperature is carried out temperature by host computer 10 and the analysis of pulse control dutycycle obtains real-time correction PWM by gathering in the stove
t, and with the pulse that obtains by sintering curve control dutycycle specified rate PWM
g, obtain the pulse duty factor specified rate PWM of current time after their actings in conjunction
s, with PWM
sBe input to impulse controller 7, the 3rd actuator 8 is regulated the burning time of combustion oxygen gas mixture or " dutycycle " of shared time of big fire reaches combustion requirements to control.
The whole outsourcings of used device among the present invention, for example: each controller can adopt Siemens programmable controller S7-300 series, actuator adopts the BELIMO YE, and gas valve and oxygen valve adopt BELIMO linear regulation valve, and burner adopts Ar-50K-H-PL high-speed pulse burner to realize.Controller is connected with host computer through the RS232 interface, and host computer is a PC.Can transmit information by the RS232 agreement between controller and the host computer, host computer passes on command signal to give controller by it, controller can be controlled its subordinate's equipment according to the instruction of host computer, instrumentation can pass to host computer with the kiln real time information, carries out real-time demonstration and data storage by host computer.
Claims (4)
1. the method for controlling combustion of oxygen enrichment and all-oxygen combustion roller kiln, it is characterized in that adopting the pulse-combustion control method, it is to burn more than 21% and with combustion gas mixing that oxygen in the described roller kilns internal combustion atmosphere is remained on volume content, automatically regulate the ratio and the burning time of oxygen and combustion gas simultaneously, specifically:
(1) by oxygen and combustion gas closed loop feedback control separately, the mixed proportion parameter of regulating oxygen and combustion gas automatically; According to the real time information of kiln atmosphere and temperature,, obtain the real-time controlled quentity controlled variable of combustion gas and oxygen specified rate simultaneously to revising by determined combustion gas of sintering curve and oxygen specified rate;
(2) under the acting in conjunction of above-mentioned two kinds of controlled quentity controlled variable signals, Gas controller and oxygen controller are regulated gas valve and oxygen valve in real time by actuator separately, realize and keep predefined best combustion control ratio;
(3) utilize host computer sampling and in the kiln in real time, the pulse duty factor specified rate that sintering curve is determined is revised, obtain real-time controlled quentity controlled variable behind the combustion atmosphere and temperature information Treatment Analysis that are obtained;
(4) the real-time controlled quentity controlled variable signal that obtains according to feedback to the burning time of the gaseous mixture of the control in real time of described actuator and adjusting combustion gas and oxygen or the ratio of shared time of big fire, is realized best combustion control by impulse controller.
2. method for controlling combustion according to claim 1 is characterized in that: use pulse modulation technology, the burning time of the gaseous mixture of adjusting combustion gas and oxygen or the ratio of shared time of big fire realize the pulse-combustion control mode.
3. method for controlling combustion according to claim 1 is characterized in that: described controller all adopts industrial Programmable Logic Controller, its with host computer between all adopt the RS-232 communication modes to be connected.
4. according to claim 1 or 3 described method for controlling combustion, it is characterized in that: host computer adopts PC.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100487835A CN101338910B (en) | 2008-08-12 | 2008-08-12 | Oxygen-enriched and all-oxygen combustion roller kiln combustion control method |
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| CN2008100487835A CN101338910B (en) | 2008-08-12 | 2008-08-12 | Oxygen-enriched and all-oxygen combustion roller kiln combustion control method |
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| CN101338910A true CN101338910A (en) | 2009-01-07 |
| CN101338910B CN101338910B (en) | 2010-11-03 |
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| CN103482851A (en) * | 2013-09-09 | 2014-01-01 | 佛山市沛沣科技有限公司 | Low-pressure powdered fuel conveying system for small and medium-sized glass smelting furnace |
| CN104534504A (en) * | 2014-12-25 | 2015-04-22 | 河北钢铁股份有限公司承德分公司 | Rotary kiln combustion control device and method |
| CN104848247A (en) * | 2015-05-15 | 2015-08-19 | 常州市东升检测仪器有限公司 | Atmosphere field control system of heating furnace |
| CN106322381A (en) * | 2016-08-27 | 2017-01-11 | 山东雷帕得汽车技术股份有限公司 | Proportional combustion control device |
| CN106369601A (en) * | 2016-08-27 | 2017-02-01 | 山东雷帕得汽车技术股份有限公司 | Stable-proportion combustor with fuel gas precleaning function |
| CN109141050A (en) * | 2018-10-11 | 2019-01-04 | 唐山纳川富氧节能科技有限公司 | With the zinc-plated Kiln Control System of oxygen-enriched combustion-supporting |
| CN113253711A (en) * | 2021-07-02 | 2021-08-13 | 深圳百里科技有限公司 | Ceramic manufacturing method based on Internet of things, cloud server, industrial control equipment and system |
| CN113883506A (en) * | 2021-09-13 | 2022-01-04 | 国能国华(北京)电力研究院有限公司 | Control method of oxygen-enriched combustion air supply system |
| CN116294578A (en) * | 2023-05-22 | 2023-06-23 | 天津巴莫科技有限责任公司 | Roller kiln and gas control device thereof |
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- 2008-08-12 CN CN2008100487835A patent/CN101338910B/en not_active Expired - Fee Related
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| CN103482851B (en) * | 2013-09-09 | 2015-12-23 | 陈晓玲 | For the pulverized fuel low-pressure delivery system of middle-size and small-size glass-melting furnace |
| CN103482851A (en) * | 2013-09-09 | 2014-01-01 | 佛山市沛沣科技有限公司 | Low-pressure powdered fuel conveying system for small and medium-sized glass smelting furnace |
| CN104534504B (en) * | 2014-12-25 | 2017-01-18 | 河北钢铁股份有限公司承德分公司 | Rotary kiln combustion control device and method |
| CN104534504A (en) * | 2014-12-25 | 2015-04-22 | 河北钢铁股份有限公司承德分公司 | Rotary kiln combustion control device and method |
| CN104848247A (en) * | 2015-05-15 | 2015-08-19 | 常州市东升检测仪器有限公司 | Atmosphere field control system of heating furnace |
| CN106369601A (en) * | 2016-08-27 | 2017-02-01 | 山东雷帕得汽车技术股份有限公司 | Stable-proportion combustor with fuel gas precleaning function |
| CN106322381A (en) * | 2016-08-27 | 2017-01-11 | 山东雷帕得汽车技术股份有限公司 | Proportional combustion control device |
| CN106322381B (en) * | 2016-08-27 | 2018-11-02 | 山东雷帕得汽车技术股份有限公司 | Ratio combustion control device |
| CN106369601B (en) * | 2016-08-27 | 2018-11-02 | 山东雷帕得汽车技术股份有限公司 | The ratio stabilizing burner of preliminary clearning combustion gas |
| CN109141050A (en) * | 2018-10-11 | 2019-01-04 | 唐山纳川富氧节能科技有限公司 | With the zinc-plated Kiln Control System of oxygen-enriched combustion-supporting |
| CN113253711A (en) * | 2021-07-02 | 2021-08-13 | 深圳百里科技有限公司 | Ceramic manufacturing method based on Internet of things, cloud server, industrial control equipment and system |
| CN113253711B (en) * | 2021-07-02 | 2021-10-22 | 深圳百里科技有限公司 | Ceramic manufacturing method based on Internet of things, cloud server, industrial control equipment and system |
| CN113883506A (en) * | 2021-09-13 | 2022-01-04 | 国能国华(北京)电力研究院有限公司 | Control method of oxygen-enriched combustion air supply system |
| CN116294578A (en) * | 2023-05-22 | 2023-06-23 | 天津巴莫科技有限责任公司 | Roller kiln and gas control device thereof |
| CN116294578B (en) * | 2023-05-22 | 2023-08-08 | 天津巴莫科技有限责任公司 | Roller kiln and gas control device thereof |
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