CN113897467B - Heating-up denitration hot blast stove energy-saving device and control system thereof - Google Patents
Heating-up denitration hot blast stove energy-saving device and control system thereof Download PDFInfo
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- CN113897467B CN113897467B CN202111123983.4A CN202111123983A CN113897467B CN 113897467 B CN113897467 B CN 113897467B CN 202111123983 A CN202111123983 A CN 202111123983A CN 113897467 B CN113897467 B CN 113897467B
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B9/00—Stoves for heating the blast in blast furnaces
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B9/00—Stoves for heating the blast in blast furnaces
- C21B9/10—Other details, e.g. blast mains
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Abstract
The invention discloses a heating denitration hot blast stove energy-saving device and a control system thereof, wherein the heating denitration hot blast stove energy-saving device comprises a smoke-air mixer, a fan, a pressure instrument and the like; a low-temperature side inlet pipeline of the smoke-air mixer is connected with an outlet pipeline of a combustion fan of the hot blast stove, and the outlet pipeline of the combustion fan is provided with a regulating valve, a flowmeter and a thermometer; a high-temperature side inlet pipeline of the smoke-air mixer is connected with a high-temperature fan outlet pipeline, and the high-temperature fan outlet pipeline is provided with a regulating valve, a flowmeter and a thermometer; the high-temperature flue gas and the combustion-supporting air in the flue gas and air mixer are fully mixed according to a certain proportion, so that the preheating effect is achieved. The device calculates the target flow of the required combustion-supporting air and hot flue gas in a control program through a flow meter signal of a gas pipeline at the inlet of the hot blast stove, adjusts the opening of the adjusting valves on the high-temperature flue gas pipeline and the combustion-supporting air pipeline respectively, adjusts the flow on the two pipelines to the target flow according to a difference algorithm, and reduces the gas consumption under the condition of ensuring the stable combustion amount of the hot blast stove.
Description
Technical Field
The invention relates to an energy-saving device of a heating denitration hot blast stove and a control system thereof, in particular to an energy-saving device of a heating denitration hot blast stove and a control system thereof.
Background
In the operation of the temperature-rising denitration device of the steel mill, the combustion-supporting air of the hot blast stove mainly adopts normal-temperature air, the opening of the regulating valve of the inlet gas pipeline of the hot blast stove is regulated according to the temperature of the hot blast furnace hearth, the flow of the combustion-supporting air is correspondingly regulated according to the flow of the coal gas, but the control mode has the following problems:
1) the combustion-supporting air adopts normal-temperature air, and a certain amount of heat is additionally consumed when the temperature is increased;
2) because the load fluctuation of the coal gas in a steel mill is frequent and the change is large, when the opening of the regulating valve is regulated only by depending on the temperature of the hearth, the hot blast stove is easy to extinguish due to low pressure of the coal gas.
3) The digitization degree is low, the stop analysis of the hot blast stove mainly depends on manual experience judgment, and the rationality and reliability of the operation parameter control further improve the space.
Disclosure of Invention
The invention aims to solve the defects in the prior art and provides an energy-saving device for a heating denitration hot blast stove and a control system thereof.
In order to realize the purpose, the invention adopts the following technical scheme: a heating denitration hot blast stove energy-saving device and a control system thereof are disclosed, wherein the energy-saving device comprises a combustion-supporting fan, an adjusting valve, a pressure transmitter, a flowmeter, a hot blast stove, a flue gas mixer, a high-temperature fan, an industrial personal computer, a zirconium oxide analyzer and a temperature transmitter; the regulating valve, the pressure transmitter, the flowmeter and the zirconia analyzer are arranged on an outlet pipeline of the combustion fan and connected with the flue gas mixer; the regulating valve, the pressure transmitter, the flowmeter, the zirconia analyzer and the temperature transmitter are arranged on an outlet pipeline of the high-temperature fan and are connected with the flue gas mixer; the data collected by the regulating valve, the pressure transmitter, the flowmeter and the zirconia analyzer are finally transmitted to the industrial personal computer through an output port; and the hot flue gas collected by the high-temperature fan is sourced from the outlet of the denitration reactor.
The hot flue gas collected and introduced into the denitration reactor by the high-temperature fan contains carbon monoxide, wherein the carbon monoxide can be ignited by being used as fuel, and the coal gas consumption is effectively reduced.
Preferably, the energy-saving device is also provided with a coal gas inlet end; the coal gas inlet end is connected with the hot blast stove through a pipeline and then is connected with the flue gas mixer; the outlet pipeline of the coal gas inlet end is also provided with the regulating valve, the pressure transmitter, the flowmeter and the zirconia analyzer.
Preferably, the industrial personal computer transmits information to the combustion fan, the high-temperature fan and the regulating valve, the pressure transmitter, the flowmeter, the zirconia analyzer and the temperature transmitter on the outlet pipeline of the coal gas inlet end.
Preferably, the regulating valve, the pressure transmitter, the flow meter, and the temperature transmitter are regulated by an algorithm that calculates:
the flow of the gas pipeline is judged once every 10S, and the corresponding high-temperature flue gas and combustion-supporting air flow are correspondingly calculated, wherein the expression is as follows:
L m ＝(L G1 +L Z1 )/α
L G1 ＝Δ×L Z1
Δ＝(21-β)/2
where Lm is the gas flow, L G1 Is the target flow rate, L, of the high temperature flue gas Z1 Is the target flow of combustion air, alpha is the air excess coefficient, and beta is the oxygen content of the high temperature flue gas.
Preferably, the steps of the control system are as follows:
s1: according to the existing comparison between the target flow of the high-temperature flue gas and the feedback flow of the high-temperature flue gas flowmeter, the opening of the regulating valve is regulated to enable the feedback flow to approach the target flow infinitely, so that the purpose of automatic regulation is realized, and the control logic is as follows:
If(L G ≤L G1 ×0.95)
a G1 ＝a G +0.01
Else a G1 ＝a G -0.01
wherein a is G1 For regulating the aperture target value of the valve for high-temperature flue gas, a G Feeding back a numerical value for the opening of the high-temperature flue gas regulating valve;
s2: according to the comparison of the target flow of the existing combustion-supporting air and the feedback flow of the combustion-supporting air flow meter, the opening of the regulating valve is regulated to enable the feedback flow to be infinitely close to the target flow, and the purpose of automatic regulation is realized, wherein the control logic is as follows:
If(L G ≤L G1 ×1.05)
a Z1 ＝a Z +0.01
Else a Z1 ＝a Z -0.01
wherein, aZ1 is a target value of the opening of the combustion-supporting air adjusting valve, and aZ is a feedback value of the opening of the combustion-supporting air adjusting valve;
s3: the gas consumption saved by the waste heat of the combustion air is calculated in real time according to a temperature transmitter and a flowmeter on a high-temperature flue gas pipeline in the system, and the expression is as follows:
Q＝(T-20)×Δ q1 ×L G
L M1 ＝Q/Δq1
L JH ＝L JQ +L M1 *Δt
wherein Q is total heat recycled by high-temperature flue gas, T is feedback temperature of the temperature transmitter, delta q1 Specific heat of high temperature flue gas, L M1 For saving gas consumption per unit time, L JQ The accumulated consumption of the coal gas is saved; LJH is the accumulated consumption of the later-saved gas; Δ t is 10 s.
Preferably, the flue gas mixer consists of a hot flue gas inlet, a combustion-supporting air inlet, an outer shell, a support rod and a mixed air swirl blade; the air mixing swirl vane is fixed in the outer shell through the support rod; combustion-supporting air and hot flue gas enter the flue gas mixer through the hot flue gas inlet and the combustion-supporting air inlet respectively and are mixed and then divided into a plurality of self-rotating hot air flows through the air-mixing swirl blades.
Preferably, the mixed air swirl blades are designed to be staggered in the same row, the included angle between each blade and the flue gas in the downstream direction is 30-60 degrees, the included angle between each blade and the flue gas in the staggered row is 60-90 degrees, and the distance between each blade in the same row is 1.5-2 times that between each blade and the outer shell.
Compared with the prior art, the invention has the beneficial effects that:
1. the high-temperature flue gas in the mixing denitration reactor effectively reduces the total amount of the flue gas generated by the hot blast stove and the total amount of the flue gas.
2. The preheating combustion-supporting air effectively reduces the gas consumption, and realizes the energy saving and consumption reduction of the heating denitration hot blast stove.
3. And a new adjusting mode is added, and the combustion-supporting air quantity is reversely adjusted according to the change of the coal gas flow, so that the hot blast stove is ensured not to be flameout in a low-pressure coal gas state.
4. The introduced high-temperature flue gas contains carbon monoxide, and the carbon monoxide is ignited as fuel, so that the coal gas consumption is reduced.
Drawings
FIG. 1 is a schematic structural diagram of an energy-saving device of a heating denitration hot blast stove and a control system thereof;
FIG. 2 is a schematic flow chart of an energy-saving control system of the heating denitration hot blast stove adopting the system in FIG. 1;
FIG. 3 is a schematic structural view of the flue gas mixer 6;
in the figure: 1-combustion-supporting fan; 2-adjusting the valve; 3-a pressure transmitter; 4-a flow meter; 5-hot blast stove; 6-flue gas mixer; 7-high temperature fan; 8-an industrial personal computer; 9-zirconia analyzer; 10-a temperature transmitter; 11-gas inlet end; 61-hot flue gas inlet; 62-combustion-supporting air inlet; 63-an outer shell; 64-a support bar; 65-wind swirl vanes.
Detailed Description
In order to further understand the objects, structures, features, and functions of the present invention, the following embodiments are described in detail.
Referring to fig. 1, 2 and 3, the invention provides an energy-saving device for a heating denitration hot blast stove and a control system thereof, wherein the energy-saving device comprises a combustion-supporting fan 1, a regulating valve 2, a pressure transmitter 3, a flowmeter 4, a hot blast stove 5, a flue gas mixer 6, a high-temperature fan 7, an industrial personal computer 8, a zirconia analyzer 9 and a temperature transmitter 10.
The adjusting valve 2, the pressure transmitter 3, the flowmeter 4 and the zirconia analyzer 9 are arranged on an outlet pipeline of the combustion fan 1 and connected with the flue gas mixer 6.
The regulating valve 2, the pressure transmitter 3, the flowmeter 4, the zirconia analyzer 9 and the temperature transmitter 10 are arranged on an outlet pipeline of the high-temperature fan 7 and are connected with the flue gas mixer 6; a temperature transmitter 10 is added for calculating the total heat recycled in the high temperature flue gas.
The data collected by the regulating valve 2, the pressure transmitter 3, the flowmeter 4 and the zirconia analyzer 9 are finally transmitted to the industrial personal computer 8 through an output port; the hot flue gas collected by the high-temperature fan 7 is sourced from the outlet of the denitration reactor; higher control and manufacturing requirements are put forward for the existing hot blast stove system.
Preferably, the energy-saving device is also provided with a coal gas inlet end 11; the gas inlet end 11 is connected with the hot blast stove 5 through a pipeline and then is connected with the flue gas mixer 6; the outlet pipeline of the coal gas inlet end 11 is also provided with the regulating valve 2, the pressure transmitter 3, the flowmeter 4 and the zirconia analyzer 9.
High-temperature combustion-supporting air produced by the energy-saving device is mixed with the coal gas inlet end 11 in the flue gas mixer 6; the outlet pipeline of the coal gas inlet end 11 is also provided with the regulating valve 2, the pressure transmitter 3, the flowmeter 4 and the zirconia analyzer 9; the method puts higher requirements on the setting of a control instrument of the hot blast stove system, and perfects and supplements the realization of full-automatic regulation of the hot blast stove system.
Preferably, the industrial personal computer 8 transmits information with the combustion fan 1, the high temperature fan 7 and the regulating valve 2, the pressure transmitter 3, the flow meter 4, the zirconia analyzer 8 and the temperature transmitter 10 on the outlet pipeline of the coal gas inlet end 11.
Preferably, the regulating valve 2, the pressure transmitter 3, the flow meter 4 and the temperature transmitter 10 are regulated by an algorithm which calculates:
the flow of the gas pipeline is judged once every 10S, the target flow of the corresponding high-temperature flue gas and the combustion air flow is correspondingly calculated, and the expression is as follows:
L m ＝(L G1 +L Z1 )/α
L G1 ＝Δ×L Z1
Δ＝(21-β)/2
wherein L is m Is the gas flow rate, L G1 Is the target flow rate, L, of the high temperature flue gas Z1 Is the target flow of combustion air, alpha is the air excess coefficient, and beta is the oxygen content of the high-temperature flue gas.
By the control mode, the concept of energy management is introduced on the basis of calculation when the air and fuel of the hot blast stove system are ensured, a new idea is provided for energy conservation and consumption reduction of the hot blast stove, and the problem of energy conservation and consumption reduction of the hot blast stove is effectively limited.
Preferably, the steps of the control system are as follows:
s1: according to the existing comparison between the target flow of the high-temperature flue gas and the feedback flow of the high-temperature flue gas flowmeter, the opening of the regulating valve is regulated to enable the feedback flow to approach the target flow infinitely, so that the purpose of automatic regulation is realized, and the control logic is as follows:
If(L G ≤L G1 ×0.95)
a G1 ＝a G +0.01
Else a G1 ＝a G -0.01
wherein a is G1 For regulating the aperture target value of the valve for high-temperature flue gas, a G And feeding back a numerical value for the opening of the high-temperature flue gas regulating valve.
S2: according to the existing combustion air target flow and combustion air flowmeter feedback flow comparison, adjust the aperture of the regulating valve, make the feedback flow infinitely approach the target flow, achieve the goal of automatic regulation, its control logic is:
If(L G ≤L G1 ×1.05)
a Z1 ＝a Z +0.01
Else a Z1 ＝a Z -0.01
wherein a is Z1 Adjusting a target value of valve opening for combustion air, a Z Adjusting the opening degree feedback value of the valve for combustion-supporting air;
s3: the method comprises the following steps of calculating the gas consumption saved by the waste heat of combustion air in real time according to a temperature transmitter and a flowmeter on a high-temperature flue gas pipeline in the system, wherein the expression is as follows:
Q＝(T-20)×Δ q1 ×L G
L M1 ＝Q/Δ q1
L JH ＝L JQ +L M1 *Δt
wherein Q is the total heat quantity recycled by the high-temperature flue gas, T is the feedback temperature of the temperature transmitter,
Δ q1 specific heat of high-temperature flue gas, L M1 For saving gas consumption per unit time, L JQ The accumulated consumption of the coal gas is saved; l is a radical of an alcohol JH The accumulated consumption of the coal gas is saved; Δ t is 10 s.
The energy saving and consumption reduction of the hot blast stove system reach quantitative indexes by improving the automatic control level of the hot blast stove; the energy-saving index is convenient to calculate when the energy-saving carbon is used by an owner, which is an important index of the carbon neutralization concept at present, and the carbon is saved and the energy is saved when the energy-saving carbon is used; the automatic control level of the hot blast stove is improved, and quantitative indexes are provided for energy conservation and consumption reduction of a hot blast stove system.
Preferably, the flue gas mixer 6 is composed of a hot flue gas inlet 61, a combustion-supporting air inlet 62, an outer shell 63, a support rod 64 and a mixed air swirl vane 65; the wind mixing swirl vanes 65 are fixed in the outer shell 63 through the support rods 64; the combustion-supporting air and the hot flue gas enter the flue gas mixer 6 through the hot flue gas inlet 61 and the combustion-supporting air inlet 62 respectively, are mixed and then are divided into a plurality of self-rotating hot air flows through the air-mixing rotating blades 65.
Preferably, the mixed-air swirl vanes 65 are designed to be staggered in the same row, the included angle between the vanes and the flue gas downstream direction is 30-60 degrees, the included angle between the vanes staggered in the same row is 60-90 degrees, and the distance between the vanes in the same row is 1.5-2 times of the distance between the vanes and the outer shell.
The theoretical calculation range of the design of the premixing device is described, which is a protection for the specific manufacturing method of the mixing device
The method comprises the following specific implementation steps:
the first step is as follows: a combustion air and high-temperature flue gas valve of the hot blast stove 5 is used for opening methane gas for ignition;
the second step is that: the ignition of the hot blast stove is successful, and when the temperature of a hearth reaches above 500 ℃, a blast furnace gas valve is opened to ensure that the hot blast stove normally and stably operates;
the third step: adjusting the flow of combustion-supporting air and the flow of high-temperature flue gas in proportion according to the oxygen amount change of the high-temperature flue gas at the denitration outlet and the flow change of blast furnace gas;
L m ＝(L G1 +L Z1 )/α
L G1 ＝Δ×L Z1
Δ＝(21-β)/2
the fourth step: and the gas quantity is saved through calculation and accumulation.
The method comprises the steps that real-time data are obtained through an adjusting valve 2, a pressure transmitter 3, a flowmeter 4, a zirconia analyzer 9 and a temperature transmitter 10 which are connected with pipelines of a high-temperature fan 7, a combustion-supporting fan 1 and a coal gas inlet end 11 in sequence; then, the obtained data is transmitted to an industrial personal computer 8 through information, and then judgment and adjustment are carried out according to an algorithm; the feedback flow infinitely approaches the target flow by adjusting the opening of the regulating valve, the aim of automatic regulation is realized, the digitization degree is further deepened, the shutdown analysis of the hot blast stove is mainly converted into machine judgment from manual experience judgment, and the rationality and the reliability of operation parameter control are improved.
The present invention has been described in relation to the above embodiments, which are only exemplary of the implementation of the present invention. It should be noted that the disclosed embodiments do not limit the scope of the invention. Rather, it is intended that all such modifications and variations be included within the spirit and scope of this invention.
Claims (5)
1. The utility model provides a intensification denitration hot-blast furnace economizer's control system which characterized in that: the energy-saving device comprises a combustion-supporting fan (1), an adjusting valve (2), a pressure transmitter (3), a flowmeter (4), a hot blast stove (5), a flue gas mixer (6), a high-temperature fan (7), an industrial personal computer (8), a zirconium oxide analyzer (9) and a temperature transmitter (10); the regulating valve (2), the pressure transmitter (3), the flowmeter (4) and the zirconia analyzer (9) are arranged on an outlet pipeline of the combustion fan (1) and are connected with the flue gas mixer (6); the regulating valve (2), the pressure transmitter (3), the flowmeter (4), the zirconia analyzer (9) and the temperature transmitter (10) are arranged on an outlet pipeline of the high-temperature fan (7) and are connected with the flue gas mixer (6); data collected by the regulating valve (2), the pressure transmitter (3), the flowmeter (4) and the zirconia analyzer (9) are finally transmitted to the industrial personal computer (8) through an output port; the hot flue gas collected by the high-temperature fan (7) is sourced from the outlet of the denitration reactor; the regulating valve (2), the pressure transmitter (3), the flow meter (4) and the temperature transmitter (10) are regulated by an algorithm which is calculated as follows: the flow of the gas pipeline is judged once every 10S, and the corresponding high-temperature flue gas and combustion air flow are correspondingly calculated, wherein the expression is as follows:
Lm＝(L G1 +L Z1 )/α
L G1 ＝Δ×L Z1
Δ＝(21-β)/2
where Lm is the gas flow, L G1 Is the target flow rate, L, of the high temperature flue gas Z1 Is the target flow of combustion-supporting air, alpha is the air excess coefficient, and beta is the oxygen content of the high-temperature flue gas; the heating denitration hot blast stove control system comprises the following steps:
s1: according to the existing comparison between the target flow of the high-temperature flue gas and the feedback flow of the high-temperature flue gas flowmeter, the opening of the regulating valve is regulated to enable the feedback flow to approach the target flow infinitely, so that the purpose of automatic regulation is realized, and the control logic is as follows: if (L) G ≤L G1 ×0.95)
a G1 ＝a G +0.01
Else a G1 ＝a G -0.01
Wherein a is G1 For regulating the aperture target value of the valve for high-temperature flue gas, a G Feeding back a numerical value for the opening of the high-temperature flue gas regulating valve;
s2: according to the existing comparison between the target flow of combustion air and the feedback flow of a combustion air flowmeter, the opening of the regulating valve is regulated to enable the feedback flow to be infinitely close to the target flow, so that the purpose of automatic regulation is realized, and the control logic is as follows: if (L) G ≤L G1 ×1.05)
a Z1 ＝a Z +0.01
Else a Z1 ＝a Z -0.01
Wherein a is Z1 For regulating the target value of the opening of the valve for combustion air, a Z Feeding back a numerical value for the opening of the combustion air regulating valve;
s3: the method comprises the following steps of calculating the gas consumption saved by the waste heat of combustion air in real time according to a temperature transmitter and a flowmeter on a high-temperature flue gas pipeline in the system, wherein the expression is as follows:
Q＝(T-20)×Δq1×L G
L M1 ＝Q/Δ q1
L JH ＝L JQ +L M1 *Δt
wherein Q is the total heat quantity recycled by the high-temperature flue gas,t is the feedback temperature of the temperature transmitter, delta q1 is the specific heat of the high-temperature flue gas, L M1 For saving gas consumption per unit time, L JQ The accumulated consumption of the coal gas is saved; l is a radical of an alcohol JH The accumulated consumption of the coal gas is saved; Δ t is 10 s.
2. The control system of the energy-saving device of the heating denitration hot blast stove, as set forth in claim 1, is characterized in that: the energy-saving device is also provided with a coal gas inlet end (11); the gas inlet end (11) is connected with the hot blast stove (5) through a pipeline and then is connected with the flue gas mixer (6); the outlet pipeline of the coal gas inlet end (11) is also provided with the regulating valve (2), the pressure transmitter (3), the flowmeter (4) and the zirconia analyzer (9).
3. The control system of the energy-saving device of the heating denitration hot blast stove, as set forth in claim 2, is characterized in that: and the industrial personal computer (8) and the combustion fan (1), the high-temperature fan (7) and the outlet pipeline of the coal gas inlet end (11) are used for transmitting information among the adjusting valve (2), the pressure transmitter (3), the flowmeter (4), the zirconia analyzer (9) and the temperature transmitter (10).
4. The control system of the energy-saving device of the heating denitration hot blast stove, as set forth in claim 1, is characterized in that: the flue gas mixer (6) consists of a hot flue gas inlet (61), a combustion-supporting air inlet (62), an outer shell (63), a support rod (64) and a mixed air swirl blade (65); the wind mixing swirl vane (65) is fixed in the outer shell (63) through the support rod (64); combustion-supporting air and hot flue gas enter the flue gas mixer (6) through a hot flue gas inlet (61) and a combustion-supporting air inlet (62) respectively and are mixed, and then are divided into a plurality of self-rotating hot air flows through an air-mixing cyclone blade (65).
5. The control system of the energy-saving device of the heating denitration hot blast stove, as set forth in claim 4, is characterized in that: the mixed air swirl blades (65) are designed to be staggered in the same row, the included angle between each blade and the flue gas in the downstream direction is 30-60 degrees, the included angle between each blade and the flue gas in the staggered row is 60-90 degrees, and the distance between each blade in the same row is 1.5-2 times that between each blade and the outer shell.
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| CN202532702U (en) * | 2012-05-02 | 2012-11-14 | 刘力铭 | Top combustion hot-blast stove capable of achieving double preheating through mix of high-temperature smoke and low-temperature smoke |
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| JPS6365230A (en) * | 1986-09-03 | 1988-03-23 | Kobe Steel Ltd | Burning control method for hot air furnace |
| JP4759872B2 (en) * | 2001-08-02 | 2011-08-31 | Ｊｆｅスチール株式会社 | Blast temperature control method for hot stove |
| CN204513798U (en) * | 2015-03-30 | 2015-07-29 | 河北钢铁股份有限公司承德分公司 | A kind of Combustion of Hot Air Furnace control device |
| CN106839746B (en) * | 2017-02-10 | 2019-01-22 | 中冶赛迪工程技术股份有限公司 | A kind of bf coal injection system combustion gas furnace, which automatically optimizes, burns furnace control method |
| CN110533270B (en) * | 2018-05-28 | 2023-02-03 | 广东韶钢松山股份有限公司 | Method for evaluating running state of preheater of blast furnace hot blast stove |
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| CN202532702U (en) * | 2012-05-02 | 2012-11-14 | 刘力铭 | Top combustion hot-blast stove capable of achieving double preheating through mix of high-temperature smoke and low-temperature smoke |
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