CN117327848A - Method for treating suspended materials in hydrogen-rich carbon circulating oxygen blast furnace - Google Patents
Method for treating suspended materials in hydrogen-rich carbon circulating oxygen blast furnace Download PDFInfo
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- CN117327848A CN117327848A CN202311065850.5A CN202311065850A CN117327848A CN 117327848 A CN117327848 A CN 117327848A CN 202311065850 A CN202311065850 A CN 202311065850A CN 117327848 A CN117327848 A CN 117327848A
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- 229910052739 hydrogen Inorganic materials 0.000 title claims abstract description 105
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 title claims abstract description 103
- 239000001257 hydrogen Substances 0.000 title claims abstract description 103
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims abstract description 99
- 239000001301 oxygen Substances 0.000 title claims abstract description 99
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 99
- 239000000463 material Substances 0.000 title claims abstract description 42
- 238000000034 method Methods 0.000 title claims abstract description 35
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 32
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 32
- 239000007789 gas Substances 0.000 claims abstract description 192
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 71
- 238000005261 decarburization Methods 0.000 claims abstract description 40
- 238000002347 injection Methods 0.000 claims abstract description 38
- 239000007924 injection Substances 0.000 claims abstract description 38
- 239000002893 slag Substances 0.000 claims abstract description 20
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000000725 suspension Substances 0.000 claims abstract description 14
- 239000003245 coal Substances 0.000 claims abstract description 13
- 229910052742 iron Inorganic materials 0.000 claims abstract description 9
- 238000004519 manufacturing process Methods 0.000 claims abstract description 9
- 229910052757 nitrogen Inorganic materials 0.000 claims description 34
- 238000007664 blowing Methods 0.000 claims description 12
- 239000002817 coal dust Substances 0.000 claims description 11
- 238000002485 combustion reaction Methods 0.000 claims description 9
- 238000010926 purge Methods 0.000 claims description 9
- 238000011084 recovery Methods 0.000 claims description 9
- 230000009467 reduction Effects 0.000 claims description 9
- 239000000571 coke Substances 0.000 claims description 7
- 230000009471 action Effects 0.000 claims description 5
- 230000008569 process Effects 0.000 abstract description 13
- 230000036284 oxygen consumption Effects 0.000 abstract description 7
- 238000003723 Smelting Methods 0.000 abstract description 6
- 229910001873 dinitrogen Inorganic materials 0.000 abstract description 3
- 125000004122 cyclic group Chemical group 0.000 abstract description 2
- 238000010438 heat treatment Methods 0.000 abstract description 2
- 238000005262 decarbonization Methods 0.000 description 6
- 239000003034 coal gas Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000004880 explosion Methods 0.000 description 3
- 230000003211 malignant effect Effects 0.000 description 3
- 230000001502 supplementing effect Effects 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 2
- 238000009851 ferrous metallurgy Methods 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 239000005431 greenhouse gas Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000010310 metallurgical process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
- C21B5/06—Making pig-iron in the blast furnace using top gas in the blast furnace process
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
- C21B7/24—Test rods or other checking devices
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacture Of Iron (AREA)
Abstract
The invention belongs to the technical field of blast furnace ironmaking, and particularly discloses a method for treating suspended materials in a hydrogen-rich carbon circulating oxygen blast furnace, which is characterized in that according to the process characteristics of total oxygen smelting, top gas decarburization heating cyclic utilization and blast furnace hydrogen-rich smelting of the hydrogen-rich carbon circulating oxygen blast furnace, when the blast furnace is difficult to run and even suspended materials occur, the method is characterized by comprising the following steps of: after the slag iron is discharged, stopping pulverized coal injection at the tuyere, gradually reducing decarburization gas consumption, hydrogen-rich gas consumption and oxygen consumption at the tuyere, adopting a measure of injecting nitrogen gas at the tuyere to prevent slag returning and even slag filling at the tuyere, carrying out full stopping operation, gradually recovering an air supply system after finishing material sitting, enabling a ruler to act normally, recovering a normal value of the pressure difference of the whole blast furnace, starting coal injection operation at the tuyere, and ensuring normal production of the blast furnace, thereby solving the problems of suspension and unsmooth furnace condition of the hydrogen-rich carbon circulating oxygen blast furnace.
Description
Technical Field
The invention relates to the technical field of blast furnace ironmaking, in particular to a method for treating suspended materials in a hydrogen-rich carbon circulating oxygen blast furnace.
Background
The hydrogen-rich carbon circulating oxygen blast furnace is characterized in that total oxygen smelting and top gas decarburization are circulated in the traditional blast furnace ironmaking metallurgical process, and hydrogen is used for replacing carbon, so that the greenhouse gas emission of the ferrous metallurgy process is greatly reduced until the carbon neutralization of the ferrous metallurgy production process is realized.
In conventional blast furnace ironmaking processes, the stopping of the descent of the burden beyond a certain time (e.g., 1-2 batch down time specified by some plants) is a suspension, which is an indication of furnace upsets. The suspension is divided into: upper suspensory, lower suspensory, hot suspensory and cold suspensory, and refractory suspensory. The outstanding suspended materials which are not solved by sitting for three times or more are intractable suspended materials. The suspensoid is called malignant suspensoid for more than 4 hours.
The hydrogen-rich carbon circulating oxygen blast furnace also has the problem of suspension in the traditional blast furnace smelting. At present, the conventional blast furnace adopts measures of reducing blowing and even blowing and carrying out sitting, and air with the oxygen enrichment rate of 3-8% is blown into the conventional blast furnace, wherein the oxygen enrichment rate refers to the proportion of oxygen content in blast furnace gas. The method solves the problem of suspension of the hydrogen-rich carbon circulating oxygen blast furnace because pure oxygen and heated high-temperature decarburized coal gas are blown into the tuyere of the hydrogen-rich carbon circulating oxygen blast furnace, and if the operation is improper during the treatment, the problem of suspension of the hydrogen-rich carbon circulating oxygen blast furnace in the operation process cannot be solved, and even malignant accidents such as explosion, tuyere slag filling and the like can occur.
Disclosure of Invention
The invention aims to provide a method for treating suspended materials in a hydrogen-rich carbon circulating oxygen blast furnace, which aims to solve the problem that the suspended materials of the hydrogen-rich carbon circulating oxygen blast furnace cannot be thoroughly treated by the existing method for solving the suspended materials problem of the conventional blast furnace, and even can cause malignant accidents.
In order to achieve the above purpose, the basic scheme provided by the invention is as follows: the method for treating the suspended materials in the hydrogen-rich carbon circulating oxygen blast furnace is characterized by comprising the following steps of:
s1: an operator monitors the condition of the blast furnace in real time, and judges that the blast furnace is in forward running variation and suspended when the pressure difference of the whole blast furnace is increased, the hot gas pressure of the air supply main pipe is increased and the dipperstick is kept motionless;
s2: after the blast furnace is discharged to remove slag iron, the consumption of decarburization gas is gradually reduced according to 5-10%, the consumption of hydrogen-rich gas is gradually reduced according to 5-10%, the pulverized coal injection quantity of a tuyere is gradually reduced according to 10-20%, and the consumption of oxygen is gradually reduced according to 5-10%, until the decarburization gas, the hydrogen-rich gas and the oxygen are completely stopped to be injected into the tuyere, and nitrogen is injected into a decarburization gas pipe network, a hydrogen-rich gas pipe network and an oxygen pipe network;
s3: reducing the blowing amount of nitrogen until stopping introducing nitrogen into the decarburization gas pipe network, the hydrogen-rich gas pipe network and the oxygen pipe network, and carrying out material sitting;
s4: after the material sitting is finished, respectively carrying out nitrogen purging in the decarburization gas pipe network, the hydrogen-rich gas pipe network and the oxygen pipe network;
s5: after nitrogen purging for 3-5 minutes, oxygen injection, decarburization gas injection and hydrogen-rich gas injection are sequentially recovered;
s6: and after the pressure difference of the whole blast furnace and the normal action of the trial rod are monitored, the injection quantity of oxygen, decarburized gas and hydrogen-rich gas is continuously recovered, and when the injection quantity of the oxygen, the decarburized gas and the hydrogen-rich gas reaches the recovery quantity, the tuyere starts to inject coal dust, so that the blast furnace is recovered to normal production.
The principle and the beneficial effects of the invention are as follows: according to the technical characteristics of total oxygen smelting of a hydrogen-rich carbon circulating oxygen blast furnace, decarburization and heating cyclic utilization of top gas and hydrogen-rich smelting of the blast furnace, when the blast furnace is difficult to run and even suspended materials occur, the method solves the problems by the following steps: after the slag iron is discharged, stopping pulverized coal injection at the tuyere, gradually reducing decarburized gas consumption, hydrogen-rich gas consumption and oxygen consumption at the tuyere, adopting measures of injecting nitrogen to prevent slag returning and even slag filling at the tuyere, simultaneously blocking combustible gas such as oxygen and the like, further reducing the effect of comprehensive blast capacity of the tuyere, carrying out after the complete stopping operation, gradually recovering an air supply system after the material sitting is finished, ensuring normal operation of the blast furnace by normal actions of a material ruler, recovering normal pressure difference of the whole blast furnace, starting the coal injection operation at the tuyere, and ensuring normal production of the blast furnace, thereby solving the problems of suspension and unsmooth furnace condition of the hydrogen-rich carbon circulating oxygen blast furnace.
Step S2, keeping the theoretical combustion temperature of the tuyere unchanged; the reaction in the furnace has an optimal theoretical combustion temperature interval, and other parameters are adjusted to stabilize the furnace condition on the premise of ensuring the stability of the theoretical combustion temperature of the tuyere in the gas reducing process.
In a third aspect, which is a preferred embodiment, in step S2, the nitrogen flow is 5000-10000m 3 /h; under the blowing of the nitrogen flow, the safety of the air supply system is ensured, and the air supply can be effectively avoidedAnd (5) returning slag or filling slag by the wind device.
In the fourth aspect, the second aspect is preferable, and in the step S2, the roof pressure is reduced by 10% by the roof pressure control system; when the nitrogen and air supply system is stopped, the pressure relief is ensured to be matched simultaneously, and the pressure is reduced by 10% of the set value according to the pressure relief standard.
In the fifth scheme, the fourth scheme is preferable, and after the decarburization gas, the hydrogen-rich gas and the oxygen are all stopped being sprayed into the tuyere, the unqualified gas generated by the blast furnace is burned and then is discharged; the unqualified gas refers to CO and H 2 The sum of the volume percentages is lower than 30%, the calorific value of the gas output by the part is lower, the gas cannot be provided for subsequent gas users, if the unqualified gas with the low calorific value enters the subsequent gas users, the gas users can not burn normally to release heat, the production accident is caused by light weight, and the flameout accident is caused by heavy weight.
In the sixth scheme, the method is preferable, and before the coal dust is injected into the air port in the step S6, the injection quantity of oxygen, decarbonized gas and hydrogen-rich gas reaches more than 50% of the normal injection quantity;
when the blowing amount of the oxygen, the decarbonized gas and the hydrogen-rich gas is recovered to more than 50% of the normal amount, the size and the kinetic energy of the formed tuyere convolution area can just meet the requirement of tuyere coal injection.
The seventh scheme is the optimization of the basic scheme, and after the material sitting in the step S4 is finished, the flow of nitrogen purging is 50-80% of the standard design flow; when the nitrogen is lower than 50%, the decarburization gas pipe network, the hydrogen-rich gas pipe network and the oxygen pipe network cannot be purged completely, and under the condition that grease, coal gas and other impurities are not purged completely, the decarburization gas pipe network, the hydrogen-rich gas pipe network and the oxygen pipe network are directly fed with oxygen, flash explosion is easy to occur in the decarburization gas pipe network, the hydrogen-rich gas pipe network and the oxygen pipe network, and the furnace is easy to blow dry due to excessive nitrogen flow.
A eighth scheme is the preference of the second scheme, wherein the theoretical combustion temperature of the tuyere is 1900-2300 ℃; ensuring good heat state and gas temperature of the blast furnace hearth after stopping air supply.
A ninth aspect is a preferred aspect of the present invention, wherein clean coke is fed to the blast furnace during the reduction of decarburized gas, hydrogen-rich gas and oxygen and the recovery of the strand; after stopping the air supply, the reduced decarbonized gas, hydrogen-rich gas and coal dust are converted into coke to be added into the furnace for heat compensation in order to ensure the heat of the blast furnace.
Description of the embodiments
The invention is described in further detail below by way of specific embodiments:
an in-furnace suspended material treatment method for a hydrogen-rich carbon circulating oxygen blast furnace comprises the following steps:
s1: an operator monitors the condition of the blast furnace in real time, and judges that the blast furnace is in forward running variation and suspended when the pressure difference of the whole blast furnace is increased, the hot gas pressure of the air supply main pipe is increased and the dipperstick is kept motionless;
s2: gradually reducing the decarburization gas consumption according to the reduction of 5-10% each time after the blast furnace is discharged with clean slag iron, reducing the hydrogen-rich gas consumption according to the reduction of 5-10% each time, reducing the tuyere coal dust injection amount by 10-20% according to the reduction of 10-20% each time, and reducing the oxygen injection amount according to the reduction of 5-10% each time until the decarburization gas, the hydrogen-rich gas and the oxygen are all stopped to be injected into the tuyere;
s3: reducing the blowing amount of nitrogen until stopping introducing nitrogen into the decarburization gas pipe network, the hydrogen-rich gas pipe network and the oxygen pipe network, and carrying out material sitting;
s4: after the material sitting is finished, respectively carrying out nitrogen purging in the decarburization gas pipe network, the hydrogen-rich gas pipe network and the oxygen pipe network;
s5: after nitrogen purging for 3-5 minutes, oxygen injection, decarburization gas injection and hydrogen-rich gas injection are sequentially recovered;
s6: after the pressure difference and the trial rod of the blast furnace are normal, the injection quantity of oxygen, decarburized gas and hydrogen-rich gas is continuously recovered, and when the injection quantity of oxygen, decarburized gas and hydrogen-rich gas is recovered to more than 50% of normal quantity, the tuyere starts to inject coal dust, and the blast furnace is recovered to normal production.
The following describes the technical scheme of the present invention in more detail through specific examples, but is not used for limiting the protection scope of the present invention.
The operator needs to monitor the condition of the blast furnace in real time, determines whether the blast furnace is or is likely to be suspended by analyzing and judging the pressure difference (the pressure difference between the hot gas at the tuyere and the pressure at the top of the blast furnace), the hot gas pressure at the main air supply pipe and the action condition of the dipperstick, and judges that the blast furnace is in forward running variation to cause suspended when the detection finds that the pressure difference of the blast furnace is increased, the hot gas pressure at the main air supply pipe is increased and the dipperstick is kept motionless. At the moment, the comprehensive tuyere blast target is realized by controlling the decarburization gas consumption, the hydrogen-rich gas consumption, the tuyere coal dust injection quantity and the oxygen consumption, so as to treat suspended materials and relieve the situation that furnace burden is difficult to operate.
When suspended materials are processed, firstly, slag iron discharging operation is needed until the slag iron is discharged completely, after the slag iron is discharged completely, the decarburization coal gas consumption is controlled by controlling the decarburization coal gas control valve, the hydrogen-rich gas consumption is controlled by controlling the hydrogen-rich gas control valve, the oxygen consumption is controlled by controlling the oxygen flow control valve, and meanwhile, the air port pulverized coal injection quantity is controlled.
On the premise of keeping unchanged according to the theoretical combustion temperature of the tuyere, the consumption of decarburized gas is gradually reduced, the consumption of decarburized gas is 5-10%, the consumption of hydrogen-rich gas is gradually reduced, the consumption of coal dust injection of the tuyere is gradually reduced according to the 5-10%, the coal dust injection of the tuyere is gradually reduced according to the 10-20%, the consumption of oxygen is gradually reduced according to the 5-10%, and finally the aim of reducing comprehensive blasting of the tuyere is achieved, wherein the theoretical combustion temperature of the tuyere is 1900-2300 ℃.
When the reduction of the decarburized gas consumption, the hydrogen-rich gas consumption and the oxygen consumption is lower than 5%, the trend of suppressing the suspended materials is not achieved, so that the suspended materials are not easy to treat for a long time, and when the reduction of the decarburized gas consumption, the hydrogen-rich gas consumption and the oxygen consumption is overlarge, namely, the reduction exceeds 10% at one time, slag is possibly returned and even poured into the air supply device, and air supply equipment is possibly damaged.
The consumption of decarbonization gas, the consumption of hydrogen-rich gas and the consumption of oxygen are gradually reduced until the decarbonization gas, the hydrogen-rich gas and the oxygen are completely stopped from being sprayed into the tuyere, and in order to ensure the safety of the system, the material can be seated under the condition that the decarbonization gas, the hydrogen-rich gas and the oxygen are completely shut down, otherwise, under the condition that the gas is not stopped, the combustible gas is remained in the air supply pipeline, so that the explosion occurs in the air supply pipeline.
Under the condition that the operation of gradually reducing the injection quantity of decarburization gas, hydrogen-rich gas and oxygen is invalid, wherein the invalid means that the internal pressure difference of the blast furnace exceeds a reference value and continuously rises, a furnace internal material line is still kept still, an operator directly closes a decarburization gas control valve, a hydrogen-rich gas control valve and an oxygen flow control valve to stop continuously injecting decarburization gas, hydrogen-rich gas and oxygen into an air port, and nitrogen is injected into a decarburization gas pipe network, a hydrogen-rich gas pipe network and an oxygen pipe network, under the condition of complete stop, the nitrogen is introduced to avoid the instant air port slag returning and even slag filling of the air stopping, and the flow of the injected nitrogen is set to be 5000-10000m 3 And/h, blocking the combustible gas such as oxygen by nitrogen, further reducing the effect of comprehensive blast capacity, and relieving the suspension phenomenon caused by forward running difference of the blast furnace.
In the process of reducing the pressure until stopping the tuyere and spraying decarburized gas, hydrogen-rich gas and oxygen, the furnace top pressure needs to be synchronously controlled, a furnace top pressure control valve needs to be fully opened before material sitting, the furnace top pressure is reduced by a furnace top pressure control system, and the furnace top pressure is reduced by 10%.
CO and H in gas produced by blast furnace 2 The gas with the volume percent sum of less than 30 percent has lower heat value, belongs to unqualified output gas and cannot be utilized by subsequent gas users; when the gas analyzer detects that unqualified output gas exists after the decarburization gas, the hydrogen-rich gas and the oxygen are completely stopped and the coal dust is stopped being sprayed to the tuyere, the gas pipeline and a subsequent gas user are disconnected and connected to the diffusing port, the unqualified output gas is burnt and discharged at the diffusing port, the gas with low heat value is prevented from entering the subsequent gas user pipe network to affect other working procedures, if the unqualified low heat value gas enters the subsequent gas user, the gas user can not burn and release heat normally, production accidents are caused if the unqualified low heat value gas is light, and flameout accidents are caused if the unqualified low heat value gas enters the subsequent gas user. At the same time, warpAfter the gas detecting instrument detects that no combustible gas exists in the air supply pipeline, the nitrogen gas inlet amount is greatly reduced, and the process is ready for sitting after the nitrogen gas is stopped being introduced into the decarburization gas pipe network, the hydrogen-rich gas pipe network and the oxygen pipe network.
After the material sitting operation is finished, the air supply system and related parameters need to be recovered. Firstly, respectively introducing nitrogen into a decarbonization gas pipe network, a hydrogen-rich gas pipe network and an oxygen pipe network, purging the decarbonization gas pipe network, the hydrogen-rich gas pipe network and the oxygen pipe network by using the nitrogen, setting the flow of the nitrogen to be 50-80% of the standard design flow, and setting the standard design flow of the nitrogen to be 20000m 3 And/h. In the process, the theoretical combustion temperature of the tuyere is required to be kept at 1900-2300 ℃, nitrogen is purged for 3-5 minutes, an oxygen flow control valve is firstly opened to blow oxygen into an air supply pipeline, after oxygen blowing is started, decarburization gas and hydrogen-rich gas are respectively blown through a decarburization gas pipe network and a hydrogen-rich gas pipe network, when the oxygen, the decarburization gas and the hydrogen-rich gas are respectively restored to 30% of the normal blowing amount, the blowing amount of the oxygen, the decarburization gas and the hydrogen-rich gas is gradually increased according to the amplitude of 5-10%, and the blowing of the decarburization gas and the hydrogen-rich gas is started, and simultaneously, the nitrogen introducing amount in the decarburization gas pipe network, the hydrogen-rich gas pipe network and the oxygen pipe network is reduced, and the nitrogen introducing is gradually stopped.
After observing that the pressure difference of the whole blast furnace is recovered to a normal value and the action of a dipperstick is normal, the problem of suspension is solved, the injection quantity of oxygen, decarburized gas and hydrogen-rich gas is continuously recovered, in the injection process, a tuyere convolution zone is gradually formed, when the injection quantity of the oxygen, the decarburized gas and the hydrogen-rich gas is respectively recovered to more than 50% of the normal recovery quantity, the tuyere convolution zone formed at the moment is gradually increased, the kinetic energy of the tuyere convolution zone can meet the tuyere coal injection operation, and the tuyere pulverized coal injection is started, so that the blast furnace is recovered to normal production; wherein the normal amount of oxygen is 12000-16000m 3 Per h, the normal quantity of decarbonization gas is 35000m 3 Over/h, the normal amount of hydrogen-rich gas is 5000-10000m 3 And/h, the recovery amount is more than 50% of the sum of normal amounts of oxygen, decarbonized gas and hydrogen-rich gas, namely when the recovery amount is 30000m 3 At/h, recovery can be achievedAnd (5) re-spraying coal.
In the process of recovering the oxygen, decarbonizing gas and hydrogen-rich gas from the hydrogen-rich carbon circulating oxygen blast furnace to the oxygen pipe network, the decarbonizing gas pipe network and the hydrogen-rich gas pipe network, an operator cuts off the gas pipeline connected to the diffusing port and communicated with the blast furnace output gas after detecting that the heat value of the gas reaches the standard through the gas analyzer, and the gas pipeline is integrated into a subsequent gas user pipe network.
In the process of reducing the decarburized gas consumption, the hydrogen-rich gas consumption and the oxygen consumption of the hydrogen-rich carbon circulating oxygen blast furnace and in the process of recovering and blowing oxygen, the decarburized gas and the hydrogen-rich gas after sitting, the heat is supplemented by supplementing the clean coke according to the suspension time and the material line height in the furnace.
If the suspension duration exceeds 1 hour, the stockline is lower than 4 meters, and the coke supplementing load is not lower than 10%; if the suspension duration exceeds 1 hour, the stockline is lower than 5 meters, and the coke supplementing accord is not lower than 15 percent. Wherein, the decarbonized gas, the hydrogen-rich gas and the coal powder are respectively added into a hydrogen-rich carbon circulating oxygen blast furnace according to the amount of the corresponding coke converted by the replacement ratio; wherein the displacement ratio of the decarbonized gas is 0.25-0.35kg/m 3 The replacement ratio of the hydrogen-rich gas is 0.25-0.35kg/m 3 The replacement ratio of the pulverized coal is 0.7-0.8kg/kg.
If the hydrogen-rich carbon circulating oxygen blast furnace has frequent and long-time suspension conditions, the blast furnace is poor in running, the distribution of the gas flow is optimized by properly loosening the air flow at the guide edge, the furnace temperature is increased to be more than 1450 ℃ in the processes of reducing gas, sitting and recovering gas supply, the binary basicity of the slag system is reduced to be 1.0-1.1 times of a reference value, slag iron in the furnace is discharged, and various furnace washing measures are adopted to assist in solving the problem of running the blast furnace.
The foregoing is merely exemplary embodiments of the present invention, and specific structures and features that are well known in the art are not described in detail herein. It should be noted that modifications and improvements can be made by those skilled in the art without departing from the structure of the present invention, and these should also be considered as the scope of the present invention, which does not affect the effect of the implementation of the present invention and the utility of the patent. The protection scope of the present application shall be subject to the content of the claims, and the description of the specific embodiments and the like in the specification can be used for explaining the content of the claims.
Claims (9)
1. The method for treating the suspended materials in the hydrogen-rich carbon circulating oxygen blast furnace is characterized by comprising the following steps of:
s1: an operator monitors the condition of the blast furnace in real time, and judges that the blast furnace is in forward running variation and suspended when the pressure difference of the whole blast furnace is increased, the hot gas pressure of the air supply main pipe is increased and the dipperstick is kept motionless;
s2: after the blast furnace is discharged to remove slag iron, the consumption of decarburization gas is gradually reduced according to 5-10%, the consumption of hydrogen-rich gas is gradually reduced according to 5-10%, the pulverized coal injection quantity of a tuyere is gradually reduced according to 10-20%, and the consumption of oxygen is gradually reduced according to 5-10%, until the decarburization gas, the hydrogen-rich gas and the oxygen are completely stopped to be injected into the tuyere, and nitrogen is injected into a decarburization gas pipe network, a hydrogen-rich gas pipe network and an oxygen pipe network;
s3: reducing the blowing amount of nitrogen until stopping introducing nitrogen into the decarburization gas pipe network, the hydrogen-rich gas pipe network and the oxygen pipe network, and carrying out material sitting;
s4: after the material sitting is finished, respectively carrying out nitrogen purging in the decarburization gas pipe network, the hydrogen-rich gas pipe network and the oxygen pipe network;
s5: after nitrogen purging for 3-5 minutes, oxygen injection, decarburization gas injection and hydrogen-rich gas injection are sequentially recovered;
s6: and after the pressure difference of the whole blast furnace and the normal action of the trial rod are monitored, the injection quantity of oxygen, decarburized gas and hydrogen-rich gas is continuously recovered, and when the injection quantity of the oxygen, the decarburized gas and the hydrogen-rich gas reaches the recovery quantity, the tuyere starts to inject coal dust, so that the blast furnace is recovered to normal production.
2. The method for treating suspended materials in a hydrogen-rich carbon circulating oxygen blast furnace according to claim 1, wherein the theoretical combustion temperature of the tuyere is maintained unchanged in step S2.
3. The method for treating suspended materials in a hydrogen-rich carbon circulating oxygen blast furnace according to claim 1, wherein in step S2, the nitrogen flow is 5000-10000m 3 /h。
4. The method for treating an in-furnace suspension for a hydrogen-rich carbon circulating oxygen blast furnace according to claim 2, wherein in step S2, the roof pressure is reduced by 10% by a roof pressure control system.
5. The method for treating suspended materials in a hydrogen-rich carbon circulating oxygen blast furnace according to claim 4, wherein after all of the decarbonized gas, the hydrogen-rich gas and the oxygen are stopped being injected into the tuyere, the off-grade gas produced by the blast furnace is burned and then discharged.
6. The method for treating suspended materials in a hydrogen-rich carbon circulating oxygen blast furnace according to claim 1, wherein the recovery amount of oxygen, decarbonized gas and hydrogen-rich gas before the coal dust injection is started in the tuyere in step S6 is 50% or more of the normal injection amount.
7. The method for treating suspended materials in a hydrogen-rich carbon circulating oxygen blast furnace according to claim 1, wherein the flow rate of nitrogen purging after the completion of the material sitting in step S4 is 50-80% of the standard design flow rate.
8. The method for treating suspended materials in a hydrogen-rich carbon circulating oxygen blast furnace according to claim 2, wherein the theoretical combustion temperature of the tuyere is 1900-2300 ℃.
9. The method for treating suspended materials in a hydrogen-rich carbon circulating oxygen blast furnace according to claim 1, wherein clean coke is fed into the blast furnace during the reduction of decarburized gas, hydrogen-rich gas and oxygen and the recovery of sitting materials in the blast furnace.
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| CN202311065850.5A CN117327848A (en) | 2023-08-23 | 2023-08-23 | Method for treating suspended materials in hydrogen-rich carbon circulating oxygen blast furnace |
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| CN202311065850.5A Pending CN117327848A (en) | 2023-08-23 | 2023-08-23 | Method for treating suspended materials in hydrogen-rich carbon circulating oxygen blast furnace |
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| Country | Link |
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| CN (1) | CN117327848A (en) |
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2023
- 2023-08-23 CN CN202311065850.5A patent/CN117327848A/en active Pending
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