CN119105577A - Decomposition furnace outlet temperature compensation control method and system when alternative fuel changes - Google Patents
Decomposition furnace outlet temperature compensation control method and system when alternative fuel changes Download PDFInfo
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- CN119105577A CN119105577A CN202411238670.7A CN202411238670A CN119105577A CN 119105577 A CN119105577 A CN 119105577A CN 202411238670 A CN202411238670 A CN 202411238670A CN 119105577 A CN119105577 A CN 119105577A
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Abstract
The invention relates to a method and a system for compensating and controlling the outlet temperature of a decomposing furnace during the change of alternative fuel, wherein the control method is to carry out real-time adjustment of the feeding coal 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 feeding coal quantity is adjusted according to the auxiliary adjustment quantity of the coal fuel at the auxiliary adjustment time 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 for the change of the feeding coal of the alternative fuel and the decomposing furnace to the change of the temperature of the decomposing furnace. The control system adopts the control method to control the coal feeding quantity and the coal feeding time of the coal feeding system of the decomposing furnace. According to the invention, when the alternative fuel is changed, the feeding quantity is compensated and adjusted in advance to the greatest extent, so that fluctuation of the outlet temperature of the decomposing furnace is effectively reduced or even eliminated, and the influence on the downstream working condition is reduced.
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:
ΔC=((ΔW3×Δq3)-ΔH3×ΔW3×q4)/q2
The device comprises a main body, a secondary body, a primary fuel and a secondary fuel, wherein delta C is a secondary coal fuel adjustment quantity, delta W 3 is a change quantity of a feeding quantity of a substituted fuel, delta q 3 is a change quantity of a heating value of the substituted fuel, j/kg is a unit, delta H 3 is a change quantity of a moisture content ratio in the substituted fuel, q 4 is sensible heat and latent heat of moisture of the substituted fuel, j/kg is a unit, and q 2 is a heating value of the coal fuel.
Preferably, the calculation mode of the coal fuel pair adjustment time is as follows:
(1) When T 2<T1 is reached, the coal feeding is adjusted immediately (additional coal feeding amount adjustment is carried out);
(2) When T 2>T1 is carried out, the feeding is regulated (additional feeding quantity regulation is carried out) by delaying T 2-T1 time;
Wherein T 1 is the time required for changing the feeding coal of the decomposing furnace to the temperature of the decomposing furnace, and T 2 is the time required for changing the substitute fuel to the temperature of the decomposing furnace.
Preferably, the calculation mode of T 1 is that the raw material feeding amount and the alternative fuel feeding amount of the decomposing furnace are kept unchanged, the coal feeding amount is increased, the time T 10 when the coal feeding amount is increased is recorded, the temperature change of the decomposing furnace is observed, when the temperature of the decomposing furnace is increased and the temperature after the increase can be maintained, the calculation mode of the time T 11,T1＝T11-T10;T2 when the temperature of the decomposing furnace is increased and the temperature after the increase can be maintained is recorded, the raw material feeding amount and the coal feeding amount of the decomposing furnace are kept unchanged, the time T 20 when the alternative fuel feeding amount is increased and the alternative fuel feeding amount is recorded, the temperature change of the decomposing furnace is observed, and when the temperature of the decomposing furnace is increased and the temperature after the increase can be maintained is recorded, the time T 21,T2＝T21-T20 when the temperature of the decomposing furnace is increased and the temperature after the increase can be maintained is recorded.
Further, T 1 and T 2 are calculated multiple times (e.g., 3-4 times each), respectively, and the average value is taken as the time required for the change of the feeding coal of the decomposing furnace to the change of the decomposing furnace temperature and the time required for the change of the alternative fuel to the change of the decomposing 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
C=C2+C3 (1)
C2＝q2×W2 (2)
C3＝q3×W3-H3×C4 (3)
Wherein, C is the total heat required by decomposing the raw meal per hour, the unit is kj/H, C 2 is the heat generated by burning the coal fuel per hour, the unit is kj/H, C 3 is the heat generated by burning the alternative fuel per hour, q 2 is the heat value of the coal fuel, the unit is j/kg, W 2 is the feeding amount of the current coal fuel, the unit is t/H, q 3 is the heat value of the alternative fuel, the unit is j/kg, W 3 is the feeding amount of the alternative fuel, the unit is t/H, H 3 is the proportion of water contained in the alternative fuel, the unit is kj/H, and C 4 is the heat consumed by heating water per hour from normal temperature to 880 ℃.
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:
ΔF=ΔQ6/q2 (4)
ΔQ6＝ΔQ4-ΔQ5 (5)
ΔQ4＝ΔW3×Δq3 (6)
ΔQ5＝ΔH3×ΔW3×q4(7)
substituting the formula (5), the formula (6) and the formula (7) into the formula (4) to obtain:
ΔF=((ΔW3×Δq3)-ΔH3×ΔW3×q4)/q2 (8)
The fuel auxiliary adjustment amount is t/H, the total heating value change amount of the alternative fuel combustion (or the comprehensive heating value change amount of the alternative fuel combustion) when the alternative fuel changes every hour is shown as delta Q 6, the heating value change amount of the alternative fuel which can be generated by complete combustion before and after the alternative fuel changes every hour is shown as delta Q 4, the heating value change amount of the alternative fuel which can be consumed due to the change of moisture contained when the alternative fuel changes every hour is shown as delta Q 5, the heating value change amount of the alternative fuel is shown as delta W 3, the heating value change amount of the alternative fuel is shown as t/H, the heating value change amount of the alternative fuel is shown as delta Q 3, the sensible heat and the latent heat of the moisture contained in the alternative fuel are shown as delta H 3, the heating value change amount of the alternative fuel is shown as delta Q 4 is shown as j/kg, and the heating value of the coal fuel is shown as delta Q 2 is shown as j/kg.
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:
(1) When T 2<T1 is reached, the coal feeding is adjusted immediately (additional coal feeding amount adjustment is carried out);
(2) When T 2>T1 is carried out, the feeding is regulated (additional feeding quantity regulation is carried out) by delaying T 2-T1 time;
Wherein T 1 is the time required for changing the feeding coal of the decomposing furnace to the temperature of the decomposing furnace, and T 2 is the time required for changing the substitute fuel to the temperature of the decomposing furnace.
The calculation mode of T 1 is that the raw material feeding amount and the alternative fuel feeding amount of the decomposing furnace are kept unchanged, the coal feeding amount is increased, the time T 10 of increasing the coal feeding amount is recorded, the temperature change of the decomposing furnace is observed, when the temperature of the decomposing furnace is increased and the temperature after the increase can be maintained, the calculation mode of the time T 11,T1＝T11-T10;T2 of keeping the raw material feeding amount and the coal feeding amount of the decomposing furnace unchanged, the time T 20 of increasing the alternative fuel feeding amount is recorded, the temperature change of the decomposing furnace is observed, and when the temperature of the decomposing furnace is increased and the temperature after the increase can be maintained, the time T 21,T2＝T21-T20 of keeping the temperature after the temperature of the decomposing furnace is increased and the temperature after the increase can be maintained is recorded.
In order to make the calculation results of the T 1 and the T 2 more accurate (more in accordance with the actual working condition of production), the calculation of the T 1 and the T 2 can be respectively carried out for a plurality of times (for example, 3-4 times of calculation), and the 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 alternative fuel to the temperature of the decomposing furnace.
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 (6)
1. The method is characterized in that the additional coal feeding amount adjustment is carried out at the auxiliary coal feeding amount adjustment time according to the auxiliary coal fuel adjustment amount, wherein the auxiliary coal fuel adjustment amount is the adjustment amount of the coal fuel required for compensating the heat generated by the combustion of the alternative fuel caused by the change of the alternative fuel, and the auxiliary coal feeding amount 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.
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 amount of the coal fuel pair is calculated by:
ΔC(ΔW3×Δq3)-ΔH3×ΔW3×q4)/q2
The device comprises a main body, a secondary body, a primary fuel and a secondary fuel, wherein delta C is a secondary coal fuel adjustment quantity, delta W 3 is a change quantity of a feeding quantity of a substituted fuel, delta q 3 is a change quantity of a heating value of the substituted fuel, j/kg is a unit, delta H 3 is a change quantity of a moisture content ratio in the substituted fuel, q 4 is sensible heat and latent heat of moisture of the substituted fuel, j/kg is a unit, and q 2 is a heating value of the coal fuel.
3. 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:
(1) When T 2＜T1 is reached, the coal feeding is adjusted immediately;
(2) When T 2＞T1 is carried out, delaying T 2-T1 to adjust coal feeding;
Wherein T 1 is the time required for changing the feeding coal of the decomposing furnace to the temperature of the decomposing furnace, and T 2 is the time required for changing the substitute fuel to the temperature of the decomposing furnace.
4. The method for controlling temperature compensation at the outlet of a decomposing furnace when the alternative fuel is changed according to claim 3, wherein T 1 is calculated by keeping the raw material feed amount and the alternative fuel feed amount of the decomposing furnace unchanged, increasing the feed amount and recording the time T 10 when the feed amount is increased, observing the temperature change of the decomposing furnace, when the temperature of the decomposing furnace is increased and the temperature after the increase can be maintained, recording the time T 11,T1＝T11-T10;T2 when the temperature of the decomposing furnace is increased and the temperature after the increase can be maintained, and is calculated by keeping the raw material feed amount and the feed amount of the decomposing furnace unchanged, increasing the feed amount of the alternative fuel and recording the time T 20 when the feed amount of the alternative fuel is increased, observing the temperature change of the decomposing furnace, when the temperature of the decomposing furnace is increased and the temperature after the increase can be maintained, recording the time T 21,T2＝T21-T20 when the temperature of the decomposing furnace is increased and the temperature after the increase can be maintained.
5. The method for compensating for temperature at the outlet of a decomposing furnace for the change of a substitute fuel as claimed in claim 4, wherein T 1 and T 2 are calculated a plurality of times, respectively, and the average value is taken as the time required for the change of the feeding coal of the decomposing furnace to the change of the temperature of the decomposing furnace and the time required for the change of the substitute fuel to the change of the temperature of the decomposing furnace.
6. 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 (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000055308A (en) * | 1998-08-17 | 2000-02-22 | Ishikawajima Harima Heavy Ind Co Ltd | Fuel oil co-firing ratio setting method and apparatus for coal-fired boiler |
| 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 |
| WO2024174428A1 (en) * | 2023-02-22 | 2024-08-29 | 中国中材国际工程股份有限公司 | System and method for increasing substitution rate of fossil fuels in cement industry |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000055308A (en) * | 1998-08-17 | 2000-02-22 | Ishikawajima Harima Heavy Ind Co Ltd | Fuel oil co-firing ratio setting method and apparatus for coal-fired boiler |
| 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 |
| WO2024174428A1 (en) * | 2023-02-22 | 2024-08-29 | 中国中材国际工程股份有限公司 | System and method for increasing substitution rate of fossil fuels in cement industry |
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