CN113755661B - Control method of blast furnace hot blast stove flue gas air intake system for coke drying - Google Patents
Control method of blast furnace hot blast stove flue gas air intake system for coke drying Download PDFInfo
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- CN113755661B CN113755661B CN202010484322.3A CN202010484322A CN113755661B CN 113755661 B CN113755661 B CN 113755661B CN 202010484322 A CN202010484322 A CN 202010484322A CN 113755661 B CN113755661 B CN 113755661B
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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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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2100/00—Handling of exhaust gases produced during the manufacture of iron or steel
- C21B2100/60—Process control or energy utilisation in the manufacture of iron or steel
- C21B2100/64—Controlling the physical properties of the gas, e.g. pressure or temperature
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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Abstract
The invention discloses a flue gas air taking system of a blast furnace hot blast stove for drying coke and a control method, wherein the system comprises the blast furnace hot blast stove and a heat exchanger, a first air taking pipe is connected with a low-temperature flue gas pipeline, a second air taking pipe is connected with a high-temperature flue gas pipeline, the first air taking pipe and the second air taking pipe are both connected with an air taking main pipe, and the air taking main pipe is connected with an induced draft fan; the second is provided with high temperature flue gas adjusting device on getting the tuber pipe, the entrance of draught fan is equipped with first pressure measurement, first getting the tuber pipe is equipped with second pressure measurement, the first entrance of getting the tuber pipe is equipped with first temperature-detecting device, the entrance that the tuber pipe was got to the second is equipped with second temperature-detecting device. The system can convey the waste heat flue gas of the blast furnace hot blast stove to a coke drying system for use, and can control the temperature of the waste heat flue gas within an allowable range, thereby avoiding the spontaneous combustion of the coke in the drying process caused by overhigh temperature of the flue gas and the occurrence of safety risks.
Description
Technical Field
The invention relates to the technical field of metallurgy, in particular to a blast furnace hot blast stove flue gas air intake system for drying coke in a blast furnace ironmaking process. The invention also relates to a method for controlling the air intake system.
Background
78% of energy required by blast furnace ironmaking is from carbon combustion, coke is the most important fuel for blast furnace smelting, and the coke has the following functions: heat source, reducing agent, material column framework, carburizing agent and the like.
If the moisture content of the coke is high, the following disadvantages may occur:
firstly, the coke powder is easy to adhere to the screen and the lump coke, which affects the screening effect, and the coke powder is brought into the blast furnace, which is not beneficial to the furnace condition and the air permeability of the blast furnace;
secondly, a large amount of water enters the blast furnace, so that the energy consumption of the blast furnace is increased, and the cost of per ton iron is increased;
moreover, the water content of the gas is increased, which affects the quality of the gas, affects the use of users and aggravates the corrosion of pipelines. The coke is dried and heated by using high-temperature flue gas, so that the moisture of the coke can be reduced, the quality of the coke entering a furnace is improved, and the iron-making cost is reduced.
The existing coke drying process mainly comprises two processes, one is to dry coke by using flue gas generated by cooling waste heat of sinter as high-temperature flue gas, and the other is to dry coke by preparing high-temperature inert gas.
The first process adopts the flue gas of the cooling waste heat of the sinter to dry the coke, and because the oxygen content of the flue gas is high, the coke is easy to self-ignite in the coke drying process, potential safety hazards are brought, and the system cannot operate reliably.
The second process adopts a method for preparing high-temperature inert gas, the inert gas has good stability, and compared with flue gas with higher oxygen content, the risk of spontaneous combustion of coke is avoided. However, the high temperature inert gas preparation cost is high, which results in excessive system investment and operation cost.
Disclosure of Invention
The invention aims to provide a flue gas air intake system of a blast furnace hot blast stove for drying coke, so as to solve the technical problems in the process.
It is another object of the present invention to provide a method for controlling the blast furnace hot blast stove flue gas extraction system for coke drying.
In order to achieve the purpose, the invention provides a flue gas air intake system of a blast furnace hot blast stove for drying coke, which comprises the blast furnace hot blast stove and a heat exchanger arranged on a flue gas exhaust path of the blast furnace hot blast stove, wherein a high-temperature flue gas pipeline of the blast furnace hot blast stove is connected to a flue gas inlet of the heat exchanger, and a low-temperature flue gas pipeline of the blast furnace hot blast stove is connected to a flue gas outlet of the heat exchanger; the device further comprises a first air taking pipe and a second air taking pipe, wherein the first air taking pipe is connected to the low-temperature flue gas pipeline, the second air taking pipe is connected to the high-temperature flue gas pipeline, the first air taking pipe and the second air taking pipe are both connected with an air taking header pipe, and the air taking header pipe is connected to a draught fan; the second air taking pipe is provided with a high-temperature flue gas adjusting device to control the ratio of high-temperature flue gas to low-temperature flue gas; a first pressure detection device is arranged at an inlet of the induced draft fan, and a second pressure detection device is arranged on the first air taking pipe; and a first temperature detection device is arranged at the inlet of the first air taking pipe, and a second temperature detection device is arranged at the inlet of the second air taking pipe.
Preferably, the pipe orifice of the first air intake pipe is communicated with the pipe orifice of the low-temperature flue gas pipeline, and all flue gas output by the low-temperature flue gas pipeline enters the first air intake pipe.
Preferably, the low-temperature flue gas pipeline is communicated to a smoke exhaust device, the first air intake pipe is connected to the low-temperature flue gas pipeline in a bypass mode, one part of flue gas output by the low-temperature flue gas pipeline enters the first air intake pipe, and the other part of flue gas enters the smoke exhaust device.
Preferably, the induced draft fan is connected to the air supply main pipe, and the air supply main pipe is communicated to the coke bins from the bottom through the air supply branch pipes.
Preferably, the second pressure detection device is arranged on the straight pipe section of the first air exhaust pipe.
Preferably, the induced draft fan is provided with a frequency converter for controlling the rotating speed of the induced draft fan.
Preferably, the inner diameter of the second air exhaust pipe is smaller than that of the first air exhaust pipe.
Preferably, the first air intake pipe is connected to the low-temperature flue gas pipeline through a first interface, and the second air intake pipe is connected to the high-temperature flue gas pipeline through a second interface.
Preferably, the heat exchanger is an air preheater for preheating the coal gas and the combustion air introduced into the hot blast furnace.
In order to achieve the above another object, the present invention provides a control method for controlling a flue gas draft system of a blast furnace hot blast stove for drying coke according to any one of the above, including:
setting the initial rotating speed of a fan;
calculating the comprehensive resistance coefficient of the air intake main pipe and the comprehensive resistance coefficient of the first air intake pipe;
acquiring dynamic pressure and static pressure values of detection points of a first air intake pipe and an air intake main pipe at the initial flow control moment;
acquiring flue gas temperature values of detection points of a first air taking pipe and a second air taking pipe at the initial temperature control moment;
if the flow rate of the residual heat flue gas of the hot blast stove changes along with time, acquiring dynamic pressure and static pressure values of each detection point at the current moment according to a flow control time sequence;
calculating a set value of the rotating speed of the fan at the current moment according to the dynamic pressure and the static pressure value of the current moment of the detection point, the dynamic pressure and the static pressure value of the preorder moment of the detection point, the comprehensive resistance coefficient of the air intake main pipe and the comprehensive resistance coefficient of the second air intake pipe;
according to the current-time temperature value and the preorder-time temperature value of the detection point and the comprehensive resistance coefficient of the first air taking pipe and the second air taking pipe, calculating a local resistance set value of a high-temperature flue gas adjusting device of the second air taking pipe at the current time, calculating a fan rotating speed adjusting correction coefficient according to the local resistance set value, adjusting the rotating speed of the induced draft fan according to the calculation result, and taking the rotating speed as the basic rotating speed for controlling and adjusting at the next time;
if the flue gas temperature of the waste heat of the hot blast stove changes along with time, acquiring temperature values of all detection points at the current moment according to a temperature control time sequence, and calculating a resistance coefficient set value of a second air taking pipe adjusting device at the current moment;
adjusting the high-temperature flue gas adjusting device of the second air taking pipe to a set value, and entering a next-time control cycle;
the flow control and the temperature control are alternately performed in time sequence.
The blast furnace hot blast stove flue gas air intake system provided by the invention is provided with a first air intake pipe and a second air intake pipe, wherein the first air intake pipe is connected with a low-temperature flue gas pipeline, the second air intake pipe is connected with a high-temperature flue gas pipeline, the first air intake pipe and the second air intake pipe are both connected with an air intake header pipe, and the air intake header pipe is connected with a draught fan; be provided with high temperature flue gas adjusting device on the second air intaking pipe, according to first pressure detection device, second pressure detection device, first temperature-detecting device and second temperature-detecting device, can adjust high temperature flue gas and low temperature flue gas proportion through high temperature flue gas adjusting device, not only can carry the waste heat flue gas of blast furnace hot-blast stove for coke drying system and use, and can be with waste heat flue gas temperature control at the allowed range, enough flue gas heat supplies the stoving coke to use can enough be guaranteed, can avoid flue gas temperature too high again to lead to the coke spontaneous combustion at the drying process, and take place the safety risk.
The control method of the blast furnace hot blast stove flue gas air intake system provided by the invention not only can control the temperature of the waste heat flue gas within an allowable range, but also solves the problem of accurate matching of the rotating speed of the induced draft fan and the flow of the waste heat flue gas, and avoids flue gas congestion caused by over-low rotating speed of the induced draft fan and excessive air draft caused by over-high rotating speed of the induced draft fan. When guaranteeing that hot-blast furnace flue gas by make full use of with this, avoid producing adverse effect to hot-blast furnace body combustion process.
Drawings
FIG. 1 is a schematic structural diagram of a flue gas intake system of a blast furnace hot blast stove for drying coke according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of another blast furnace hot blast stove flue gas intake system for coke drying according to an embodiment of the present invention;
FIG. 3 is a schematic view of the blast furnace hot blast stove flue gas extraction system of FIG. 2 applied to a coke drying system;
FIG. 4 is an electrical control block diagram of the blast furnace hot blast stove flue gas extraction system shown in FIG. 2; FIG. 5 is a control timing chart of a flue gas air-intake system of a blast furnace hot blast stove;
FIG. 6 is a flow chart of the flow and temperature integrated control logic of the flue gas intake system of the blast furnace hot blast stove.
In the figure:
1. the blast furnace hot blast stove 2, the air preheater 3, the high temperature flue gas pipeline 4, the low temperature flue gas pipeline 5, the first air intake pipe 6, the second air intake pipe 7, the air intake header pipe 8, the draught fan 9, the frequency converter 10, the high temperature flue gas adjusting device 11, the first pressure detecting device 12, the second pressure detecting device 13, the first temperature detecting device 14, the second temperature detecting device 15, the first interface 16, the second interface 17, the chimney 18, the air supply header pipe 19, the coke bin 20, the air supply branch pipe 20
Detailed Description
In order that those skilled in the art will better understand the disclosure, the invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
In this specification, terms such as "upper, lower, inner, and outer" are established based on positional relationships shown in the drawings, and the corresponding positional relationships may vary depending on the drawings, and therefore, the terms are not to be construed as absolutely limiting the scope of protection; moreover, relational terms such as "first" and "second," and the like, may be used solely to distinguish one element from another element having the same name, without necessarily requiring or implying any actual such relationship or order between such elements.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a flue gas intake system of a blast furnace hot blast stove for drying coke according to an embodiment of the present invention.
As shown in the figure, the blast furnace hot blast stove 1 is one of main supporting devices of blast furnaces of iron works, generally, one blast furnace is matched with 3-4 hot blast stoves, the blast furnace hot blast stove 1 is used for continuously providing high-temperature hot blast with the temperature of more than 1000 ℃, and when the blast furnace hot blast stove operates, coal gas and combustion-supporting air enter the blast furnace hot blast stove 1 to be combusted, and the cold air is conveyed to the blast furnace to be utilized after being heated.
The flue gas generated by the blast furnace hot blast stove 1 is discharged through a pipeline, and the temperature of the flue gas generated by the residual heat at the outlet of the blast furnace hot blast stove 1 can reach 350 ℃. The high-temperature flue gas is preheated by the air preheater 2 to preheat coal gas and combustion air. After passing through the air preheater 2, the temperature of the flue gas is reduced to 150-170 ℃, and the flue gas is generally discharged into the atmosphere after entering a chimney through a low-temperature smoke discharge pipeline.
The waste heat flue gas of the blast furnace hot blast stove has the unique advantages of low oxygen content, belonging to free waste heat resources and the like, and is ideal high-temperature flue gas for drying coke.
The high-temperature flue gas pipeline 3 of the blast furnace hot blast stove 1 is connected to a flue gas inlet of an air preheater 2, a low-temperature flue gas pipeline 4 of the blast furnace hot blast stove 1 is connected to a flue gas outlet of the air preheater 2, a first air taking pipe 5 is connected to the low-temperature flue gas pipeline 4, a pipe orifice of one end of the first air taking pipe 5 is communicated with a pipe orifice of the low-temperature flue gas pipeline 4, all flue gas output by the low-temperature flue gas pipeline 4 enters the first air taking pipe 5, a pipe orifice of one end of a second air taking pipe 6 is connected to the high-temperature flue gas pipeline 3, the inner diameter of the second air taking pipe 6 is smaller than that of the first air taking pipe 5, the first air taking pipe 5 and the second air taking pipe 6 are both connected with an air taking header pipe 7, the inner diameter of the first air taking pipe 5 is slightly smaller than that of the air taking header pipe 7, the straight pipe sections of the first air taking pipe and the straight pipe sections are located on the same vertical straight line and connected through a conical pipe section, the other end of the second air taking pipe 6 is bent for a certain angle after being connected to the other end of the second air taking pipe section in the inclined direction, the air taking pipe section, the air taking header pipe 7 is connected to the conical pipe section, the air taking header pipe 9, the air converter, the air taking header pipe 8 is arranged for controlling the rotational speed controller, and the rotational speed controller 8, and the air converter 9.
The second air intake pipe 6 is provided with a high-temperature flue gas adjusting device 10, such as a flow adjusting valve, and the like, so as to control the proportion of the high-temperature flue gas and the low-temperature flue gas; a first pressure detection device 11 is arranged at the inlet of the induced draft fan 8, and a second pressure detection device 12 is arranged on the straight pipe section of the first air intake pipe 5; a first temperature detection device 13 is arranged at the inlet of the first air intake pipe 5, and a second temperature detection device 14 is arranged at the inlet of the second air intake pipe 6. The first pressure detection means 11 and the second pressure detection means 12 may be high temperature resistant pressure sensors, and the first temperature detection means 13 and the second temperature detection means 14 may be high temperature resistant temperature sensors.
As shown in fig. 4, the first pressure detection device 11, the second pressure detection device 12, the first temperature detection device 13 and the second temperature detection device 14 are all connected to the controller, the controller is connected to the high-temperature flue gas adjustment device 10, and when the system is in operation, the controller controls and adjusts the high-temperature flue gas adjustment device 10 according to a set program according to detection signals of the first pressure detection device 11, the second pressure detection device 12, the first temperature detection device 13 and the second temperature detection device 14, so as to meet actual use requirements.
Specifically, the first air intake pipe 5 is butted with the low-temperature flue gas pipeline 4 through a first connector 15, the high-temperature flue gas pipeline 3 is provided with a bypass pipeline, and the second air intake pipe 6 is butted with the bypass pipeline through a second connector 16. The first port 15 and the second port 16 may be flange ports as shown in the drawings, and are connected by bolts after a sealing member is disposed between the opposite flanges on the flue gas pipe to be connected. Of course, the first port 15 and the second port 16 may be other ports suitable for connecting flue gas pipes.
Referring to fig. 2, fig. 2 is a schematic structural diagram of another blast furnace hot blast stove flue gas intake system for drying coke according to an embodiment of the present invention;
in the present embodiment, the same portions as those in the first embodiment are given the same reference numerals, and the same description is omitted.
As shown in the figure, the difference between the other embodiment and the first embodiment is that a low-temperature flue gas pipeline 4 is communicated to a chimney, a first air intake pipe 5 is connected to the low-temperature flue gas pipeline 4 in a bypass manner, one part of flue gas output by the low-temperature flue gas pipeline 4 enters the first air intake pipe 5, the other part of flue gas enters a chimney 17, and the flue gas passes through the chimney 17 and then is discharged into the atmosphere.
The remaining structure is substantially the same as that of the first embodiment described above, and reference is made to the above description, which is not repeated here for the sake of brevity.
As shown in fig. 3, when blast furnace hot blast stove flue gas air intake system is applied to coke drying system, draught fan 8 is connected in air supply main pipe 18, the bottom of coke bin 19 is hollow back taper, be equipped with a plurality of air supply branch pipes 20 that are the form of bending along circumference, a plurality of air supply branch pipes 20 of each coke bin 19 all are linked together with air supply main pipe 18, draught fan 8 passes through air supply main pipe 18 and air supply branch pipe 20 with the flue gas from each coke bin 19 of bottom input, the coke in coke bin 19 is dried to the heat that utilizes the flue gas, reduce its water content.
In order to ensure that each coke bin 19 can obtain a substantially uniform drying effect, the rear half section of the air supply main pipe 18 communicated with the air supply branch pipe 20 is designed into a step-shaped structure, namely, the diameter of the air supply pipe section communicated with the first coke bin 19 is larger, the diameter of the air supply pipe section communicated with the second coke bin 19 is smaller than that of the air supply pipe section communicated with the first coke bin 19, and the like, along the flue gas conveying direction.
The above embodiments are merely preferred embodiments of the present invention, and are not limited thereto, and on the basis of the above embodiments, various embodiments can be obtained by performing targeted adjustment according to actual needs. For example, other control and detection devices are further installed on the first air intake duct 5, the second air intake duct 6 and the air intake manifold 7, or the first air intake duct 5 and the second air intake duct 6 are communicated with the low-temperature flue gas pipeline 4 and the high-temperature flue gas pipeline 3 in other manners, and so on. This is not illustrated here, since many implementations are possible.
Because there is the unstable condition of flue gas flow in the blast furnace hot-blast stove waste heat flue gas trades the stove in-process, to this, can carry out accurate control to the draught fan rotational speed to make it match with hot-blast furnace flue gas flow, avoid influencing the combustion process in the hot-blast stove body.
Referring to fig. 5 and 6, fig. 5 is a control timing chart of a flue gas intake system of a blast furnace hot blast stove; FIG. 6 is a flow chart of the flow and temperature integrated control logic of the flue gas intake system of the blast furnace hot blast stove.
As shown in the figure, a wind taking system control time sequence t0, t0', t1, t1', t2, t2', ti, ti' is set, wherein the time sequence interval is one half of the time required by the control precision (for example, the time sequence interval is 0.5 tau =30s when the control precision is required to be tau =60 s) \8230, and the time sequence interval is a flow control time sequence; t0', t1', t2', ti' \ 8230, which is a temperature control sequence. That is, the air intake flow and the temperature are alternately controlled according to the time sequence. The method of time sequence alternate control is adopted, the interference between temperature control and flow control is avoided, and meanwhile, the control precision is also ensured by dividing the control time interval into half.
Specifically, the flow control method is as follows:
firstly, according to the specific engineering design characteristics of the air intake device, the comprehensive resistance coefficient theta of the air intake main pipe and the comprehensive resistance coefficient theta of the first air intake pipe 5 are calculated 1 . When n pipes are total, the method can obtain the value of each pipe
l i Value sum xi i The value is calculated by the formula (1)) And (2).
The first pressure detection device 11 is arranged at the joint of the air intake manifold 7 and the inlet of the induced draft fan 8, and detects and obtains the static pressure and the dynamic pressure of the point. The second pressure detection device 12 is disposed on the straight tube section of the first air extraction pipe 5, and detects the dynamic pressure of the first air extraction pipe 5. The static pressure and the dynamic pressure can be obtained by direct detection or indirect detection. For example, by measuring the flow rate of the pipeline and the density of the flue gas, the dynamic pressure value can be obtained by the formula (3).
λ i Coefficient of friction resistance of air hose (total air hose)
d i Inner diameter of air duct (total air duct)
l i Length of straight pipe segment (total wind pipe)
ξ i Local coefficient of resistance of pipe fitting (total wind pipe)
λ′ i Coefficient of friction resistance of air duct (first air intake duct)
d′ i Inner diameter of air duct (first air intake duct)
l′ i -length of straight pipe section (first air intake pipe)
ξ′ i Local resistance coefficient of pipe fitting (first intake duct)
Rho-fluid density
Upsilon-tube flow velocity
The control process can be divided into time t0, t1, t2 and ti \823030atcertain time intervals (for example, 60s, the control and adjustment time intervals can be set according to specific engineering conditions)
t0 is the initial time, the induced draft fan8 rotation speed is set to the initial rotation speed N t0 And the initial rotating speed is obtained by debugging under the steady state of the flue gas flow of the blast furnace hot blast stove.
At each control time point, the detection device G acquires the time ti
And calculating the static pressure coefficient K at the current time ti and the previous time ti-1 according to formulas (5) and (6) ti And K ti-1 。
The fan rotating speed set value N at the moment ti ti And (4) calculating according to the formula (7).
Regulating the rotating speed of the induced draft fan 8 to N according to the calculation result ti And the rotating speed is taken as the basic rotating speed for controlling and adjusting the next moment. And after the flow control adjustment at the current moment is finished, the air intake system enters the next control moment.
The temperature control method comprises the following steps:
calculating the comprehensive resistance coefficient theta from the inlet F of the first air taking pipe 5 to the inlet K of the second air taking pipe 6 3 As shown in equation 7.
λ″′ i Coefficient of friction resistance of air ducts (inlet of first air intake duct 5 to inlet of second air intake duct 6)
d″′ i Inner diameter of air duct (inlet of first air intake duct 5 to inlet of second air intake duct 6)
l″′ i Length of straight pipe section (inlet of first air intake duct 5 to inlet of second air intake duct 6)
ξ″′ i Local resistance coefficient of pipe fitting (inlet of first aspiration duct 5 to inlet of second aspiration duct 6)
Calculating the comprehensive resistance coefficient of the second air intake pipe 6
λ″ i Coefficient of friction resistance of air ducts (second air intake duct 6)
d″ i Inner diameter of air duct (second air intake duct 6)
l″ i -length of straight pipe section (second air intake duct 6)
ξ″ i Local resistance coefficient of pipe fitting (second intake duct 6)
Setting the intake temperature T s (generally 220 ℃), and the smoke temperature of the first air taking pipe 5 at the moment ti' is detected to be T1 ti′ The temperature of the second air intake pipe 6 is T2 ti‘ Then ti' moment the target flow Q of the first air intake pipe 5 1 And the target flow value Q of the second air intake pipe 6 2 Ratio eta ti′ The following relationships exist:
according to the fluid mechanics characteristics of the parallel branches of the pipeline, the method comprises the following steps:
S 1 Q 1 2 ＝S 2 Q 2 2 (10)
S 1 the integrated impedance of the first air intake duct 5 and the inlet of the first air intake duct to the inlet of the second air intake duct
S 2 Impedance of second aspiration conduit 6
Obtaining a resistance set value xi of the adjusting device of the second air intake duct 6 according to the formulas (11) - (14) ti′ And adjusting the resistance value of the adjusting device 10 to xi ti′ The air intake ratio of the first air intake pipe 5 and the second air intake pipe 6 is changed according to the change of the flue gas temperature at the current moment, so that the mixed flue gas temperature is still kept at the set value T s And is not changed.
And when the temperature control process is finished, the air intake system enters the next control moment.
The control method can enable the air intake system to adapt to the waste heat flue gas flow change caused by the change of the burning state of the hot blast stove, so that the air intake system can take all the waste heat flue gas of the hot blast stove, and the full utilization is realized; and the normal operation of the hot blast stove cannot be influenced due to too much or too little air intake. Meanwhile, the temperature of the waste heat flue gas can be kept at a set value, the heat required by coke drying is ensured, and the safety risk of spontaneous combustion of the coke caused by overhigh flue gas temperature is avoided.
The flue gas air intake system and the control method of the blast furnace hot blast stove for drying coke provided by the invention are described in detail above. The principles and embodiments of the present invention have been described herein using specific examples, which are presented only to assist in understanding the core concepts of the present invention. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (9)
1. A blast furnace hot blast stove flue gas air intake system control method for coke drying is used for controlling a blast furnace hot blast stove flue gas air intake system, the blast furnace hot blast stove flue gas air intake system comprises a blast furnace hot blast stove (1) and a heat exchanger arranged on a smoke exhaust path of the blast furnace hot blast stove, a high temperature flue gas pipeline (3) of the blast furnace hot blast stove (1) is connected with a smoke inlet of the heat exchanger, and a low temperature flue gas pipeline (4) of the blast furnace hot blast stove (1) is connected with a smoke outlet of the heat exchanger; the low-temperature flue gas preheating device is characterized by further comprising a first air taking pipe (5) and a second air taking pipe (6), wherein the first air taking pipe (5) is connected to the low-temperature flue gas pipeline (4), the second air taking pipe (6) is connected to the high-temperature flue gas pipeline (3), the first air taking pipe (5) and the second air taking pipe (6) are both connected with an air taking main pipe (7), and the air taking main pipe (7) is connected to a draught fan (8); a high-temperature flue gas adjusting device (10) is arranged on the second air taking pipe (6) to control the ratio of the high-temperature flue gas to the low-temperature flue gas; a first pressure detection device (11) is arranged at an inlet of the induced draft fan (8), and a second pressure detection device (12) is arranged on the first air intake pipe (5); a first temperature detection device (13) is arranged at an inlet of the first air taking pipe (5), and a second temperature detection device (14) is arranged at an inlet of the second air taking pipe (6);
the control method comprises the following steps:
setting the initial rotating speed of an induced draft fan (8); calculating the comprehensive resistance coefficient of the air intake main pipe and the comprehensive resistance coefficient of the first air intake pipe; acquiring dynamic pressure and static pressure values of detection points of a first air taking pipe (5) and an air taking main pipe (7) at the initial flow control moment; acquiring smoke temperature values of detection points of a first air taking pipe (5) and a second air taking pipe (6) at the initial temperature control moment; if the flow rate of the residual heat flue gas of the hot blast stove changes along with time, acquiring dynamic pressure and static pressure values of each detection point at the current moment according to a flow control time sequence;
calculating a set value of the rotating speed of the induced draft fan at the current moment according to the dynamic pressure and the static pressure value of the current moment of the detection point, the dynamic pressure and the static pressure value of the preorder moment of the detection point, the comprehensive resistance coefficient of the air intake main pipe and the comprehensive resistance coefficient of the second air intake pipe;
according to the current-time temperature value and the preorder-time temperature value of the detection point and the comprehensive resistance coefficient of the first air taking pipe and the second air taking pipe, calculating a local resistance set value of a high-temperature flue gas adjusting device of the second air taking pipe (6) at the current time, calculating a fan rotating speed adjusting correction coefficient according to the local resistance set value, adjusting the rotating speed of an induced draft fan (8) according to a calculation result, and taking the rotating speed as the basic rotating speed for controlling and adjusting at the next time;
if the temperature of the flue gas generated by the waste heat of the hot blast stove changes along with time, acquiring temperature values of all detection points at the current moment according to a temperature control time sequence, and calculating a set value of a resistance coefficient of a second air taking pipe adjusting device at the current moment;
adjusting the high-temperature flue gas adjusting device of the second air taking pipe (6) to a set value, and entering a next moment control cycle;
the flow control and the temperature control are alternately performed in time sequence.
2. The method for controlling the flue gas air intake system of the blast furnace hot blast stove for drying coke according to claim 1, wherein a pipe orifice of the first air intake pipe (5) is communicated with a pipe orifice of the low-temperature flue gas pipeline (4), and all the flue gas output by the low-temperature flue gas pipeline (4) enters the first air intake pipe (5).
3. The method for controlling the flue gas air intake system of the blast furnace hot blast stove for coke drying according to claim 1, characterized in that the low-temperature flue gas pipeline (4) is communicated to a smoke exhaust device, the first air intake pipe (5) is connected to the low-temperature flue gas pipeline (4) in a bypass manner, one part of the flue gas output by the low-temperature flue gas pipeline (4) enters the first air intake pipe (5), and the other part of the flue gas enters the smoke exhaust device.
4. The method for controlling the flue gas intake system of the blast furnace hot blast stove for coke drying according to claim 1, wherein the induced draft fan (8) is connected to an air supply main pipe (18), and the air supply main pipe (18) is communicated from the bottom to each coke bin (19) through an air supply branch pipe (20).
5. The method for controlling the flue gas intake system of the blast furnace hot blast stove for coke drying according to claim 1, wherein the second pressure detection device (12) is provided in the straight pipe section of the first air intake pipe (5).
6. The method for controlling the flue gas intake system of the blast furnace hot blast stove for coke drying according to claim 1, wherein the induced draft fan (8) is provided with a frequency converter (9) for controlling the rotation speed thereof.
7. The control method of the blast furnace hot blast stove flue gas intake system for coke drying according to claim 1, characterized in that the inner diameter of the second intake pipe (6) is smaller than the inner diameter of the first intake pipe (5).
8. The method for controlling the flue gas intake system of the blast furnace hot blast stove for coke drying according to claim 1, wherein the first air intake pipe (5) is connected to the low temperature flue gas pipeline (4) through a first interface (15), and the second air intake pipe (6) is connected to the high temperature flue gas pipeline (3) through a second interface (16).
9. The blast furnace hot blast stove flue gas intake system control method for coke drying according to any one of claims 1 to 8, characterized in that the heat exchanger is an air preheater (2) for preheating coal gas and combustion air entering into the hot blast stove.
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| CN115044726A (en) * | 2022-06-15 | 2022-09-13 | 广东韶钢松山股份有限公司 | Device system and method for controlling flue gas of blast furnace hot blast stove |
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