CN103217013B - Optimization control method of temperature gradient inside rotary kiln - Google Patents
Optimization control method of temperature gradient inside rotary kiln Download PDFInfo
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- CN103217013B CN103217013B CN201310174634.4A CN201310174634A CN103217013B CN 103217013 B CN103217013 B CN 103217013B CN 201310174634 A CN201310174634 A CN 201310174634A CN 103217013 B CN103217013 B CN 103217013B
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Abstract
The invention relates to an optimization control method of temperature gradient inside a rotary kiln. The closed-ring control of the negative pressure in the kiln is realized according to the change in temperature of a kiln tail and the temperature change rate, and the closed-ring control of the air flow is realized according to the negative pressure and the load. The optimization control method effectively solve the quality problems of products caused by unreasonable distribution of the temperature field in the rotary kiln, and the fuel insufficient combustion problems caused by unreasonable temperature gradient in the rotary kiln, so as to reduce the fuel consumption and stabilize the quality of the products.
Description
Technical field
The present invention relates to industrial rotary kiln control technology field, particularly relate to optimization control method of temperature gradient in a kind of rotary kiln.
Background technology
Rotary kiln is the important technological equipment of the industries such as metallurgy, building materials, cement, rotary kiln technology device generally includes the equipment such as mulitistage cyclone, rotary kiln and cooler, it is a kind of tilted-putted continuous rotation cylinder kiln body, three temperature band are divided into, i.e. preheating section, burning zone and salband from kiln tail to kiln hood.Because different material has different technological requirements to the length of preheating zone, burning zone and salband and temperature, it is directly connected to product yield, quality, consumption of raw materials and cost etc., and therefore, rotary kiln kiln temperature controls most important.Too high calcining heat and excessive thermal oscillation, not only fuel consumption is very large, even kiln lining is worked the mischief, kiln cylinder body will be injured time serious, calcining heat is too low, can have a strong impact on clinker quality, therefore accurate rotary kiln kiln temperature control to enhance productivity, reduce costs, minimizing accident.
For the monitoring of rotary kiln kiln temperature, because kiln cylinder body does continuous print rotary motion, the temperature element installed in cylindrical shell is not easy to lead-in wire, and temperature information not easily transmits, and therefore, contact temperature-measuring mode is limited by very large in the temperature monitoring of rotary kiln.At present, temperature monitoring both at home and abroad to rotary kiln, except adopting the kiln hood fallen behind and manually seeing the view mode of fire, substantially all have employed non-contact measurement, wherein be detected as main flow with infrared scan, measure its surface temperature by the energy of receiving target object emission, reflection and conduction, then according to heat transfer principle, the functional relation of the determination that quantitative analysis kiln discharge inner wall temperature and kiln cylinder body surface temperature exist, and then obtain the Temperature Distribution in kiln.This method has certain superiority, but the method carrys out analytical derivation kiln temperature by the temperature measuring rotary kiln surface, infrared radiation thermometer has certain distance from rotary kiln, expensive etc., therefore, the method is surveyed kiln temperature and be there is hysteresis quality, and certainty of measurement is also by multifactor impacts such as temperature detection point coordinates, detection time, environment around.There is again employing thermocouple temperature measurement element afterwards, solar powered, the contact temperature-measuring of wireless transmission temperature signal, but there is system complex, poor stability, certainty of measurement is difficult to the problems such as guarantee.Therefore, obtain rotary kiln internal temperature to have difficulties to realize rotary kiln automated production.
Summary of the invention
Problem to be solved by this invention is optimization control method of temperature gradient in a kind of rotary kiln of invention, solves the problem that in rotary kiln, temperature distributing disproportionation is even, totally reaches desirable kiln temperature and controls, reduce fuel consumption, stabilized product quality.
Optimization control method of temperature gradient in a kind of rotary kiln, is provided with kiln end temperature controller, kiln head and tail differential temperature controller, temperature of kiln head measuring transducer, kiln end temperature measuring transducer, fuel flow rate setting apparatus, fuel flow controller, fuel flow rate measures and actuator, wind flow setting apparatus, wind flow controller, wind flow measurement and actuator, raw material flow measuring transducer, kiln tail kiln inner pressure measuring transducer, negative pressure setting apparatus and negative pressure controller.
Raw material flow is as an input of fuel flow rate setting apparatus, setting curve sets by design data or operating experience, output and the kiln end temperature controller of fuel flow rate setting apparatus export, kiln head and tail differential temperature controller exports the setting value of sum as fuel flow controller, natural fuel flow is as measured value, each controller adopts pid control algorithm, realizes the closed-loop control of fuel flow rate.
Kiln end temperature variable quantity, kiln end temperature rate of change are as an input of negative pressure setting apparatus, negative pressure setting apparatus exports the function for its input variable, this function is arranged according to design data or operating experience, itself and negative pressure setting value sum are as the setting value of negative pressure controller, actual suction pressure is as measured value, adopt pid control algorithm, realize the closed-loop control of negative pressure in kiln.
Fuel flow rate is as an input of wind flow setting apparatus, setting curve sets by design data or operating experience, the output of wind flow setting apparatus and the output sum of negative pressure controller are as the setting value of wind flow controller, actual wind flow is as measured value, adopt pid control algorithm, realize the closed-loop control of wind flow.
Usefulness of the present invention is: indirectly reflect temperature variations in rotary kiln by kiln end temperature change and kiln end temperature rate of change, this variable quantity is adjusted vacuum cavitations point in kiln, to change airstream in kiln state, and then reach control kiln temperature gradient.Efficiently solve the unreasonable product quality problem caused of thermo parameters method in rotary kiln, solve the problem that the fuel combustion that causes because kiln temperature gradient is unreasonable is insufficient, reach reduction fuel consumption, the object of stabilized product quality.
Accompanying drawing explanation
Accompanying drawing is optimization control method of temperature gradient block diagram in a kind of rotary kiln.
Detailed description of the invention
Raw material flow F1 is as the input of fuel flow rate setting apparatus, and setting apparatus output is the function of input variable F1, and this function is arranged according to design data or operating experience; △ T12 is the difference of kiln hood and kiln end temperature, △ T12SP is the setting value of kiln head and tail differential temperature controller, T2SP, T2 are setting value and the measured value of kiln end temperature controller respectively, output and the kiln head and tail differential temperature controller of fuel flow rate setting apparatus export, kiln end temperature controller exports the setting value of three's sum as fuel flow controller, fuel flow rate F2 is as the measured value of fuel flow controller, each controller all adopts pid control algorithm, realizes the closed-loop control of fuel flow rate; Wherein kiln head and tail differential temperature controller ratio P span 150 ~ 200, the time of integration I span ∞, derivative time D span 30 ~ 50; Kiln end temperature controller ratio P span 80 ~ 120, the time of integration I span 200 ~ 300, derivative time D span 10 ~ 20; Fuel flow controller ratio P span 60 ~ 90, the time of integration I span 30 ~ 50, derivative time D span 10 ~ 20.
Kiln end temperature variable quantity △ T2 and its rate of change △ T2 ˊ is as the input of negative pressure setting apparatus, setting apparatus output is the function of input variable △ T2 and △ T2 ˊ, this function is arranged according to service data and experience, negative pressure setting apparatus exports and the setting value of negative pressure setting value sum as negative pressure controller, actual suction pressure, as the measured value of negative pressure controller, realizes closed-loop control of negative pressure; Fuel flow rate F2 is as the input of wind flow setting apparatus, and setting apparatus output is the function of input variable F2, and this function is arranged according to design data or operating experience; The output of negative pressure setting apparatus and the output sum of wind flow setting apparatus are as the setting value of wind flow controller, and actual wind flow F3, as the measured value of wind flow controller, realizes the closed-loop control of wind flow; Wherein negative pressure controller adopts PI control algolithm, ratio P span 120 ~ 150, the time of integration I span 80 ~ 100; Wind flow controller adopts PI control algolithm, ratio P span 70 ~ 80, the time of integration I span 20 ~ 30.
Claims (2)
1. optimization control method of temperature gradient in a rotary kiln, be provided with kiln end temperature controller, kiln head and tail differential temperature controller, temperature of kiln head measuring transducer, kiln end temperature measuring transducer, fuel flow rate setting apparatus, fuel flow controller, fuel flow rate is measured and actuator, wind flow setting apparatus, wind flow controller, wind flow is measured and actuator, raw material flow measuring transducer, kiln tail kiln inner pressure measuring transducer, negative pressure setting apparatus and negative pressure controller, it is characterized in that: raw material flow is as an input of fuel flow rate setting apparatus, it is fuel flow rate setting value that setting apparatus exports, setting curve sets by design data or operating experience, the output of this setting apparatus and kiln end temperature controller, the output sum of kiln head and tail differential temperature controller is as the setting value of fuel flow controller, each controller adopts pid algorithm, realize the closed-loop control of fuel flow rate.
2. optimization control method of temperature gradient in a kind of rotary kiln according to claim 1, it is characterized in that the input as negative pressure setting apparatus of kiln end temperature variable quantity, kiln end temperature rate of change, the output of negative pressure setting apparatus is the function of its input variable, this function is arranged according to design data or operating experience, itself and negative pressure setting value sum are as the setting value of negative pressure controller, negative pressure controller adopts pid algorithm, realizes the closed-loop control of kiln tail negative pressure; Fuel flow rate is as an input of wind flow setting apparatus, setting curve sets by design data or operating experience, wind flow setting apparatus exports together with the output of negative pressure controller as the setting value of wind flow controller, wind flow controller adopts pid algorithm, realizes the closed-loop control of wind flow.
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| CN201310174634.4A CN103217013B (en) | 2013-05-13 | 2013-05-13 | Optimization control method of temperature gradient inside rotary kiln |
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| CN201310174634.4A CN103217013B (en) | 2013-05-13 | 2013-05-13 | Optimization control method of temperature gradient inside rotary kiln |
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| CN103217013A CN103217013A (en) | 2013-07-24 |
| CN103217013B true CN103217013B (en) | 2015-02-11 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103506406B (en) * | 2013-10-23 | 2015-10-21 | 北京和隆优化科技股份有限公司 | A kind of heating-furnace method for controlling temperature inner of fast automatic adaptation milling train rhythm |
| CN104880093B (en) * | 2015-04-10 | 2017-03-22 | 李晨光 | Method for intelligently controlling temperatures of furnaces and kilns |
| CN106987710B (en) * | 2017-06-13 | 2018-09-25 | 山东钢铁股份有限公司 | A kind of online pre-control method of pelletizing production technique and device |
| CN112944886A (en) * | 2021-03-08 | 2021-06-11 | 西安凯盛建材工程有限公司 | Solid waste preparation lightweight aggregate rotary kiln device for simulation experiment |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3578298A (en) * | 1969-09-26 | 1971-05-11 | Gen Electric | Method and apparatus for cement kiln control |
| US3759659A (en) * | 1972-06-08 | 1973-09-18 | Leeds & Northrup Co | Method and apparatus for cement kiln control |
| CN2828698Y (en) * | 2005-10-20 | 2006-10-18 | 朱东海 | Rotary kiln with on-lin temp measuring device on rotary kiln |
| CN101261762A (en) * | 2007-03-08 | 2008-09-10 | 原传海 | A temperature measuring method for rotary stove and its process control method |
| CN102226643A (en) * | 2011-03-28 | 2011-10-26 | 宁夏惠冶镁业集团有限公司 | Rotary kiln automatic control system and method |
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2013
- 2013-05-13 CN CN201310174634.4A patent/CN103217013B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3578298A (en) * | 1969-09-26 | 1971-05-11 | Gen Electric | Method and apparatus for cement kiln control |
| US3759659A (en) * | 1972-06-08 | 1973-09-18 | Leeds & Northrup Co | Method and apparatus for cement kiln control |
| CN2828698Y (en) * | 2005-10-20 | 2006-10-18 | 朱东海 | Rotary kiln with on-lin temp measuring device on rotary kiln |
| CN101261762A (en) * | 2007-03-08 | 2008-09-10 | 原传海 | A temperature measuring method for rotary stove and its process control method |
| CN102226643A (en) * | 2011-03-28 | 2011-10-26 | 宁夏惠冶镁业集团有限公司 | Rotary kiln automatic control system and method |
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