CN119105577B - Decomposing furnace outlet temperature compensation control method and system during alternative fuel change - Google Patents
Decomposing furnace outlet temperature compensation control method and system during alternative fuel changeInfo
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- CN119105577B CN119105577B CN202411238670.7A CN202411238670A CN119105577B CN 119105577 B CN119105577 B CN 119105577B CN 202411238670 A CN202411238670 A CN 202411238670A CN 119105577 B CN119105577 B CN 119105577B
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- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D23/00—Control of temperature
- G05D23/19—Control of temperature characterised by the use of electric means
- G05D23/20—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature
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Abstract
本发明涉及替代燃料变化时的分解炉出口温度补偿控制方法及系统，控制方法为依据煤燃料主调整量进行喂煤量的实时调节，所述煤燃料主调整量根据分解炉温度的实际值与目标值的偏差计算，还依据煤燃料副调整量在煤燃料副调整时间进行附加喂煤量调节，煤燃料副调整量为补偿因替代燃料变化导致的替代燃料燃烧产生热量的变化量所需的煤燃料的调整量，煤燃料副调整时间依据替代燃料和分解炉喂煤发生变化到分解炉温度发生变化所需的时间计算。控制系统采用所述控制方法对分解炉的喂煤系统的喂煤量和喂煤时间进行控制。本发明能够在替代燃料发生变化时，最大限度的对喂煤量提前进行补偿调整，有效减小甚至消除分解炉出口温度的波动，减小对下游工况的影响。
This invention relates to a method and system for compensating for the temperature at the outlet of a precalciner when alternative fuels change. The control method involves real-time adjustment of the coal feed rate based on a primary coal fuel adjustment, calculated from the deviation between the actual and target temperatures of the precalciner. Additionally, it involves adjusting the coal feed rate based on a secondary coal fuel adjustment during the secondary adjustment time. This secondary adjustment is the amount of coal fuel required to compensate for changes in the heat generated by the combustion of the alternative fuel due to the change in alternative fuel. The secondary adjustment time is calculated based on the time required for a change in the precalciner temperature after a change in the alternative fuel and the precalciner coal feed rate. The control system uses this method to control the coal feed rate and feeding time of the precalciner's coal feeding system. This invention can maximize the advance compensation adjustment of the coal feed rate when alternative fuels change, effectively reducing or even eliminating fluctuations in the precalciner outlet temperature and minimizing the impact on downstream operating conditions.
Description
Technical Field
The invention relates to a decomposing furnace outlet temperature compensation control method and system during the change of alternative fuel, belonging to the technical field of industrial automatic control.
Background
Under the large environment of carbon reduction, industrial production enterprises are continuously striving to reduce the use amount of coal fuel, and along with the gradual increase of energy cost, the full utilization of various alternative fuels to replace part of coal fuel becomes a new technology, and the application of the technology is wider in cement production enterprises. When cement is produced, the outlet temperature of the decomposing furnace is ensured by the heat released by the combustion of coal fuel (pulverized coal), and after the alternative fuel (such as garbage) is used, the alternative fuel can provide a part of heat, so that the consumption of the coal fuel is reduced, but the alternative fuel is generally unstable in supply, the heat value and the contained moisture of the alternative fuel are also unstable, so that the provided heat is also unstable, the outlet temperature of the decomposing furnace often generates larger fluctuation, the cement production process is influenced, and when the outlet temperature of the decomposing furnace fluctuates, the coal feeding amount needs to be adjusted to reduce the fluctuation of the outlet temperature of the decomposing furnace as much as possible. The traditional control method for adjusting the coal feeding amount comprises the steps of adjusting the coal feeding amount of the decomposing furnace according to the change of the outlet temperature of the decomposing furnace when the addition amount (feeding amount) of the alternative fuel and the contained moisture or the heat value change, namely, assuming that the raw material feeding amount does not change, and not considering the change of the alternative fuel, calculating the coal feeding amount and adjusting the coal feeding amount according to the deviation between the actual value of the temperature of the decomposing furnace and the target value of the temperature of the decomposing furnace, wherein the change of the raw material feeding amount and the change of the alternative fuel are treated as interferences.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides the decomposing furnace outlet temperature compensation control method and system when the alternative fuel is changed, which can adjust the coal feeding quantity in advance to the greatest extent when the alternative fuel is changed, and reduce the fluctuation of the decomposing furnace outlet temperature.
The technical scheme of the invention for realizing the aim is that the temperature compensation control method for the outlet of the decomposing furnace when the alternative fuel is changed carries out real-time adjustment of the coal feeding quantity according to the main adjustment quantity of the coal fuel, the main adjustment quantity of the coal fuel is calculated according to the deviation between the actual value and the target value of the temperature of the decomposing furnace, and the auxiliary coal feeding quantity is adjusted according to the auxiliary adjustment quantity of the coal fuel, wherein the auxiliary adjustment quantity of the coal fuel is the adjustment quantity of the coal fuel required for compensating the change quantity of heat generated by the combustion of the alternative fuel caused by the change of the alternative fuel, and the auxiliary adjustment time of the coal fuel is calculated according to the time required by the change of the alternative fuel to the temperature of the decomposing furnace and the time required by the change of the coal feeding of the decomposing furnace to the temperature of the decomposing furnace.
Preferably, the change in the alternative fuel includes a change in the amount of feed, moisture contained, and/or heating value of the alternative fuel.
Preferably, the calculation mode of the coal fuel auxiliary adjustment amount is as follows:
Wherein, the The unit is t/h for the auxiliary adjustment quantity of the coal fuel; The unit of the variation of the feeding amount of the alternative fuel is t/h; The unit of the change of the heat value of the alternative fuel is j/kg; the unit is the variation of the moisture content in the alternative fuel; sensible heat and latent heat of water in j/kg as alternative fuels; The unit is j/kg of the calorific value of the coal fuel.
Preferably, the calculation mode of the coal fuel pair adjustment time is as follows:
When (when) When the coal feeding is adjusted immediately (additional coal feeding amount adjustment is performed);
When (when) Delay timeTime adjusting coal feeding (additional coal feeding amount adjustment is carried out);
Wherein, the The time required from the change of the feeding coal to the decomposing furnace to the change of the temperature of the decomposing furnace; the time required for the replacement fuel to change to the temperature of the decomposing furnace.
Preferably, the method comprises the steps of,The calculation method comprises maintaining the raw material feed amount and the substitute fuel feed amount of the decomposing furnace unchanged, increasing the coal feed amount, and recording the time for increasing the coal feed amountObserving the temperature change of the decomposing furnace, when the temperature of the decomposing furnace is raised and the raised temperature can be maintained, recording the time when the temperature of the decomposing furnace is raised and the raised temperature starts to be maintained,;The calculation method comprises maintaining the raw material feeding amount and coal feeding amount of the decomposing furnace unchanged, increasing the feeding amount of the alternative fuel, and recording the time for increasing the feeding amount of the alternative fuelObserving the temperature change of the decomposing furnace, when the temperature of the decomposing furnace is raised and the raised temperature can be maintained, recording the time when the temperature of the decomposing furnace is raised and the raised temperature starts to be maintained,。
Further, calculate multiple times respectivelyAnd(E.g., 3-4 times each) the average value is taken as the time required for the decomposition furnace feed coal to change to the decomposition furnace temperature and the time required for the alternative fuel to change to the decomposition furnace temperature.
A decomposing furnace outlet temperature compensation control system comprising:
The input module is used for inputting the variation of the feeding amount of the alternative fuel, the variation of the heat value of the alternative fuel, the variation of the moisture of the alternative fuel and the sensible heat and latent heat information of the moisture of the alternative fuel;
The analysis module is used for calculating the auxiliary adjustment quantity of the coal fuel and the auxiliary adjustment time of the coal fuel by adopting any of the decomposition furnace outlet temperature compensation control methods when the alternative fuel is changed based on the information input by the input module;
And the output module is used for outputting the calculation result of the analysis module to the coal feeding system.
Preferably, the decomposing furnace outlet temperature compensation control system further comprises a temperature controller for calculating a main adjustment amount of the coal fuel according to a deviation between an actual value and a target value of the decomposing furnace temperature.
The invention has the advantages that when the alternative fuel is changed, the invention can carry out compensation adjustment (feedforward control) on the coal feeding quantity in advance to the greatest extent, and the adjustment quantity accords with a thermodynamic equilibrium mechanism, thereby effectively reducing or even eliminating fluctuation of the outlet temperature of the decomposing furnace, reducing the influence on downstream working conditions, ensuring the stability of clinker quality, and because the alternative fuel usually contains higher moisture and the change of the moisture when the alternative fuel is changed is also larger, fully considering the change quantity of heat consumed in the combustion process due to the change of the moisture of the alternative fuel, and taking the change quantity as an important factor for calculating the additional coal feeding quantity when the alternative fuel is changed, effectively reducing or even eliminating the influence of the change of the moisture on the outlet temperature of the decomposing furnace when the alternative fuel is changed, improving the accuracy of the compensation control of the outlet temperature of the decomposing furnace, ensuring the stability of the outlet temperature of the decomposing furnace, and calculating the auxiliary adjustment time of the coal feeding quantity by the time required by the change of the alternative fuel to the temperature of the decomposing furnace, so that the change of the alternative fuel to the temperature of the decomposing furnace is more accurate than the change of the coal feeding quantity when the alternative fuel is changed to the temperature of the decomposing furnace is more accurate than the change of the coal when the alternative fuel is changed.
Drawings
Fig. 1 is a schematic diagram of the control method of the present invention.
Detailed Description
Referring to fig. 1, the invention discloses a method for controlling the temperature compensation of an outlet of a decomposing furnace when alternative fuels are changed, which is used for carrying out real-time adjustment on the feeding coal quantity according to the main adjustment quantity of the coal fuels, wherein the main adjustment quantity of the coal fuels is calculated according to the deviation between the actual value and the target value of the temperature of the decomposing furnace, and the auxiliary feeding coal quantity adjustment is carried out at the auxiliary adjustment time of the coal fuels according to the auxiliary adjustment quantity of the coal fuels, and the auxiliary adjustment quantity of the coal fuels is calculated in such a way that when the alternative fuels (the alternative fuels of the coal fuels, such as garbage) are changed, the change quantity of heat generated by the combustion of the alternative fuels caused by the change of the alternative fuels is calculated, and the feeding coal adjustment quantity required by the change quantity of the compensation heat is calculated according to the change quantity of the heat quantity is used as the auxiliary adjustment quantity of the coal fuels. The adjustment time of the coal fuel pair is calculated according to the time required by changing the alternative fuel to the temperature of the decomposing furnace and the time required by changing the feeding coal of the decomposing furnace to the temperature of the decomposing furnace.
The variation in the alternative fuel typically includes variation in the amount of feed of the alternative fuel (adjusting the amount of feed of the alternative fuel), the moisture contained (e.g., changing the same alternative fuel in a different batch), and/or the heating value (e.g., changing the same alternative fuel in a different batch).
When the fuel of the decomposing furnace adopts the coal fuel and the alternative fuel at the same time, the total heat required by the decomposing furnace to decompose the raw meal is provided by the total heat generated by the combustion of the coal fuel and the total heat generated by the combustion of the alternative fuel, the total heat generated by the combustion of the coal fuel depends on the feeding amount of the coal fuel and the corresponding heat value, the total heat generated by the combustion of the alternative fuel depends on the total feeding amount of the alternative fuel and the heat value thereof, the moisture contained in the alternative fuel needs to consume heat in the combustion process, the content has negative influence on the total heat, that is, the higher the moisture contained in the alternative fuel, the higher the heat consumed by the moisture, the smaller the heat used for decomposing the raw meal, namely
(1)
(2)
(3)
Wherein, the The unit of total heat required for dividing the raw materials per hour is kj/h; the unit of heat generated by burning coal fuel per hour is kj/h; the unit of heat generated by the combustion of the alternative fuel per hour is kj/h; the unit is j/kg of the calorific value of the coal fuel; the current feeding amount of the coal fuel is t/h; The unit of the heat value of the alternative fuel is j/kg; the unit of the feeding amount of the alternative fuel is t/h; The unit is the proportion of water contained in the alternative fuel; The heat consumed per kg of water per hour from ambient temperature to 880℃is given in kj/h.
When the alternative fuel is changed, the total heating value of the alternative fuel combustion is changed, the total heating value of the coal fuel combustion is required to be correspondingly adjusted in order to ensure that the total heating value required for decomposing the raw meal is unchanged, and the total heating value of the coal fuel combustion is preferably adjusted by adjusting the feeding amount of the coal fuel (the auxiliary adjustment amount of the coal fuel) because the heating value of the coal fuel is generally unchanged, and the calculation mode is as follows:
(4)
(5)
(6)
(7)
substituting the formula (5), the formula (6) and the formula (7) into the formula (4) to obtain:
(8)
Wherein, the The unit is t/h for the auxiliary adjustment quantity of the coal fuel; the unit of the change amount of the total heating value of the combustion of the alternative fuel (or the comprehensive heating value of the combustion of the alternative fuel) when the alternative fuel changes every hour is kj/h; The unit of the heat variable quantity which can be generated by the complete combustion before and after the change of the alternative fuel per hour is kj/h; the unit of the change quantity of heat loss caused by the change of the moisture content when the alternative fuel changes every hour is kj/h; The unit of the variation of the feeding amount of the alternative fuel is t/h; The unit of the change of the heat value of the alternative fuel is j/kg; the unit is the variation of the moisture content in the alternative fuel; sensible heat and latent heat of water in j/kg as alternative fuels; The unit is j/kg of the calorific value of the coal fuel.
Since the time required for the change of the alternative fuel to the change of the temperature of the decomposing furnace is generally different from the time required for the change of the feeding of the decomposing furnace to the change of the temperature of the decomposing furnace, in order to ensure that the outlet temperature of the decomposing furnace is basically stable when the alternative fuel is changed without great fluctuation, the adjustment time (the auxiliary adjustment time) of the coal fuel (the additional feeding amount) for compensating the change amount of the heat (the change amount of the heat generated by the combustion of the alternative fuel due to the change of the alternative fuel) is calculated so that the influence of the adjustment of the feeding amount on the outlet temperature of the decomposing furnace is basically consistent with the assumption that the alternative fuel is not changed (the original alternative fuel is used and the feeding amount is not changed).
The calculation mode of the coal fuel pair adjustment time is preferably as follows:
When (when) When the coal feeding is adjusted immediately (additional coal feeding amount adjustment is performed);
When (when) Delay timeTime adjusting coal feeding (additional coal feeding amount adjustment is carried out);
Wherein, the The time required from the change of the feeding coal to the decomposing furnace to the change of the temperature of the decomposing furnace; the time required for the replacement fuel to change to the temperature of the decomposing furnace.
The calculation method comprises maintaining the raw material feed amount and the substitute fuel feed amount of the decomposing furnace unchanged, increasing the coal feed amount, and recording the time for increasing the coal feed amountObserving the temperature change of the decomposing furnace, when the temperature of the decomposing furnace is raised and the raised temperature can be maintained, recording the time when the temperature of the decomposing furnace is raised and the raised temperature starts to be maintained,;The method comprises maintaining the raw material feeding amount and coal feeding amount of the decomposing furnace unchanged, increasing the feeding amount of the alternative fuel, and recording the time for increasing the feeding amount of the alternative fuelObserving the temperature change of the decomposing furnace, when the temperature of the decomposing furnace is raised and the raised temperature can be maintained, recording the time when the temperature of the decomposing furnace is raised and the raised temperature starts to be maintained,。
In order to makeAndThe calculation result of (2) is more accurate (more accords with the actual working condition of production), and can be calculated for multiple times respectivelyAnd(E.g., 3-4 times each) the average value is taken as the time required for the decomposition furnace feed coal to change to the decomposition furnace temperature and the time required for the alternative fuel to change to the decomposition furnace temperature.
The invention also discloses a decomposing furnace outlet temperature compensation control system, which comprises:
The input module is used for inputting the variation of the feeding amount of the alternative fuel, the variation of the heat value of the alternative fuel, the variation of the moisture of the alternative fuel and the sensible heat and latent heat information of the moisture of the alternative fuel;
The analysis module is used for calculating the auxiliary adjustment quantity of the coal fuel and the auxiliary adjustment time of the coal fuel by adopting any of the decomposition furnace outlet temperature compensation control methods when the alternative fuel is changed based on the information input by the input module;
And the output module is used for outputting the calculation result of the analysis module to a coal feeding system (a coal feeding system of the decomposing furnace).
The decomposing furnace outlet temperature compensation control system preferably further comprises a temperature controller, wherein the temperature controller is used for calculating a main adjustment quantity of the coal fuel according to the deviation between the actual value and the target value of the decomposing furnace temperature and outputting the main adjustment quantity of the coal fuel to the coal feeding system. The coal feeding system of the decomposing furnace adjusts the coal feeding of the decomposing furnace according to the main coal fuel adjusting quantity, the auxiliary coal fuel adjusting quantity and the auxiliary coal fuel adjusting time.
The actual value of the decomposing furnace temperature and the information to be input by the input module can be acquired by adopting a proper sensor according to the prior art.
The preferred and optional technical means disclosed in the invention may be combined arbitrarily to form a plurality of different technical schemes, except for the specific description and the further limitation that one preferred or optional technical means is another technical means.
Claims (5)
1. The method for controlling the temperature compensation of the outlet of the decomposing furnace when the alternative fuel is changed is characterized in that the method is also used for carrying out additional coal feeding quantity adjustment according to auxiliary coal fuel adjustment quantity at auxiliary coal fuel adjustment time, wherein the auxiliary coal fuel adjustment quantity is the adjustment quantity of the coal fuel required for compensating the change quantity of heat generated by the combustion of the alternative fuel caused by the change of the alternative fuel, the auxiliary coal fuel adjustment time is calculated according to the time required from the change of the alternative fuel to the change of the temperature of the decomposing furnace and the time required from the change of the coal feeding of the decomposing furnace to the change of the temperature of the decomposing furnace, and the calculation mode of the auxiliary coal fuel adjustment quantity is as follows:
,
Wherein, the The unit is t/h for the auxiliary adjustment quantity of the coal fuel; The unit of the variation of the feeding amount of the alternative fuel is t/h; The unit of the change of the heat value of the alternative fuel is j/kg; the unit is the variation of the moisture content in the alternative fuel; sensible heat and latent heat of water in j/kg as alternative fuels; The unit is j/kg of the calorific value of the coal fuel.
2. The method for controlling the temperature compensation of the outlet of a decomposing furnace during the change of alternative fuel according to claim 1, wherein the adjustment time of the coal fuel pair is calculated by the following steps:
When (when) When the coal feeding is carried out, the coal feeding is regulated immediately;
When (when) Delay timeAdjusting the time for feeding coal;
Wherein, the The time required from the change of the feeding coal to the decomposing furnace to the change of the temperature of the decomposing furnace; the time required for the replacement fuel to change to the temperature of the decomposing furnace.
3. The method for controlling the temperature compensation of the outlet of a decomposing furnace at the time of changing an alternative fuel as claimed in claim 2, characterized in thatThe calculation method comprises maintaining the raw material feed amount and the substitute fuel feed amount of the decomposing furnace unchanged, increasing the coal feed amount, and recording the time for increasing the coal feed amountObserving the temperature change of the decomposing furnace, when the temperature of the decomposing furnace is raised and the raised temperature can be maintained, recording the time when the temperature of the decomposing furnace is raised and the raised temperature starts to be maintained,;The calculation method comprises maintaining the raw material feeding amount and coal feeding amount of the decomposing furnace unchanged, increasing the feeding amount of the alternative fuel, and recording the time for increasing the feeding amount of the alternative fuelObserving the temperature change of the decomposing furnace, when the temperature of the decomposing furnace is raised and the raised temperature can be maintained, recording the time when the temperature of the decomposing furnace is raised and the raised temperature starts to be maintained,。
4. The method for controlling temperature compensation of an outlet of a decomposing furnace at the time of changing an alternative fuel as claimed in claim 3, wherein the calculation is performed a plurality of times, respectivelyAndThe average value is taken as the time required for changing the feeding coal of the decomposing furnace to the temperature of the decomposing furnace and the time required for changing the substitute fuel to the temperature of the decomposing furnace.
5. The decomposing furnace outlet temperature compensation control system is characterized by comprising:
The input module is used for inputting the variation of the feeding amount of the alternative fuel, the variation of the heat value of the alternative fuel, the variation of the moisture of the alternative fuel and the sensible heat and latent heat information of the moisture of the alternative fuel;
The analysis module is used for calculating the auxiliary adjustment quantity of the coal fuel and the auxiliary adjustment time of the coal fuel by adopting the method for compensating and controlling the outlet temperature of the decomposing furnace when the alternative fuel is changed according to the information input by the input module;
And the output module is used for outputting the calculation result of the analysis module to the coal feeding system.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101195522A (en) * | 2007-12-19 | 2008-06-11 | 莱芜钢铁集团有限公司 | Method for calcination of chamotte in rotary cement kiln with coal gas as fuel |
| CN217202540U (en) * | 2022-03-11 | 2022-08-16 | 中信重工机械股份有限公司 | Equipment for producing lime by using alternative fuel |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4126765B2 (en) * | 1998-08-17 | 2008-07-30 | 株式会社Ｉｈｉ | Coal fired boiler fuel oil mixed ratio setting method and apparatus |
| CN116147371A (en) * | 2023-02-22 | 2023-05-23 | 中国中材国际工程股份有限公司 | A system and method for increasing the replacement rate of fossil fuels in the cement industry |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101195522A (en) * | 2007-12-19 | 2008-06-11 | 莱芜钢铁集团有限公司 | Method for calcination of chamotte in rotary cement kiln with coal gas as fuel |
| CN217202540U (en) * | 2022-03-11 | 2022-08-16 | 中信重工机械股份有限公司 | Equipment for producing lime by using alternative fuel |
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