CN115874001A - Method for determining coal gas components of multi-medium injection blast furnace belly - Google Patents
Method for determining coal gas components of multi-medium injection blast furnace belly Download PDFInfo
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- CN115874001A CN115874001A CN202211523163.9A CN202211523163A CN115874001A CN 115874001 A CN115874001 A CN 115874001A CN 202211523163 A CN202211523163 A CN 202211523163A CN 115874001 A CN115874001 A CN 115874001A
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Abstract
The invention relates to a method for determining components of coal gas at a furnace belly of a multi-medium injection blast furnace, belonging to the field of blast furnace iron making. The specific method comprises the following steps: firstly, determining the types of the blowing media of the blast furnace tuyere, and inputting the components, the blowing amount and the coke components of each blowing media of the tuyere; secondly, calculating the coke amount consumed by the tuyere raceway; then, the conversion of each injected medium and coke into CO and N is calculated respectively 2 、H 2 And the content of SiO; then, calculating the content of each component of the furnace belly coal gas; and finally, calculating the total gas quantity of the furnace bosh and the proportion of each component according to the content of each component of the furnace bosh gas. The invention overcomes the problem of deviation of the traditional furnace chamber coal gas quantity calculation method, can accurately calculate the furnace chamber coal gas quantity and the composition of the blast furnace, provides reliable data for the calculation of important parameters of the blast furnace, namely furnace chamber coal gas quantity index and theoretical combustion temperature, and provides better guidance for the operation of the blast furnace.
Description
Technical Field
The invention belongs to the field of blast furnace ironmaking, and relates to a method for determining components of coal gas at a furnace belly of a multi-medium injection blast furnace.
Background
The blast furnace is one of the main equipments for producing molten iron at home and abroad. The coal gas volume index of the furnace chamber and the theoretical combustion temperature are two important parameters of blast furnace smelting. The gas quantity index of the furnace bosh is the empty tower flow velocity of gas generated in a tuyere raceway under a standard state, and is an important index for evaluating the production efficiency of the blast furnace. The theoretical combustion temperature is an important reference index for judging the thermal state of the blast furnace hearth. And whether the calculation of the gas quantity of the furnace chamber is accurate or not directly determines the accuracy of the two parameters. Inaccurate calculation of the theoretical combustion temperature and the furnace-belly coal-gas quantity index can cause the misjudgment of a blast furnace operator on the furnace condition and influence the stable and smooth operation of the blast furnace. Under the condition of blowing coal powder into blast furnace, the gas quantity V of furnace chamber BG Generally by using
Calculated of where V B The air volume does not contain oxygen-rich quantity, m 3 /min；V O2 As total oxygen-rich amount, m 3 /min；W B Air humidity, g/m 3 ；P c The amount of the coal powder is kg/h; hydrogen content of H coal powder,%. The formula only considers the influence of the fixed carbon of the pulverized coal and the hydrogen element in the volatile component, and does not consider the CO in the volatile component 2 C, CO, N in hydrocarbon 2 、H 2 O and SiO in coal dust physical water and coal dust ash 2 、Fe 2 O 3 The reduction produces the influence of CO, coal injection carrier gas, and the like. The carbon emission of the blast furnace process accounts for more than 70 percent of the carbon emission of the high-conversion long-flow process.
Composition of gas components in furnace chamber, especially CO and H in gas 2 The content of (a) directly influences the reduction behavior of the blast furnace burden. After the blast furnace adopts the new carbon reduction technology, the tuyere is changed from two original blowing media of hot air and coal injection into hot air, coal dust and rich CO-H2-CH4-CH 4 Reducing gas is three injection media, and the traditional coal injection blast furnace is not suitable for a multi-medium injection blast furnace of a low-carbon blast furnace any more by a calculation formula of the gas quantity and the composition of the coal gas at the furnace belly.
Disclosure of Invention
In view of the above, the present invention provides a method for determining a coal gas component of a multi-medium injection blast furnace bosh, so as to overcome the problem of deviation existing in the traditional calculation method of the coal gas quantity of the bosh.
In order to achieve the purpose, the invention provides the following technical scheme:
a method for determining the gas composition of a multi-medium injection blast furnace belly comprises the following steps:
s1, determining the types of blast furnace tuyere injection media, and inputting the components, injection amount and coke components of each injection media of a tuyere;
s2, calculating the coke amount consumed by the tuyere raceway by the mass conservation of oxygen before and after the reaction in the tuyere raceway;
s3, according to the reaction of the tuyere injection medium and the tuyere consumption coke in the tuyere convolution region, the coal gas is mixed with CO and N 2 、H 2 And SiO 4 The characteristic of the composition of the components is calculated according to the components and the consumption of the blowing medium and the coke at the tuyere by the Gauss law 2 、H 2 And the content of SiO;
s4, according to CO and N generated by each injection medium and coke 2 、H 2 And the content of SiO, calculating the content of each component of the furnace bosh gas;
s5, calculating the total gas quantity of the furnace bosh and the proportion of each component according to the content of each component of the furnace bosh gas.
Optionally, the blast furnace tuyere blowing medium is air, pulverized coal and rich CO-H 2 -CH 4 Reducing one or more of coal gas and oxygen; CO-H-enriched air is sprayed in the tuyere injection medium 2 -CH 4 The reducing gas is one or more of coke oven gas, natural gas, coal bed gas, converter gas decarburization gas, europe and metallurgy furnace decarburization gas, blast furnace top decarburization gas and the like.
Optionally, the coal powder can be converted into coal gas at the furnace belly, and the components of the coal gas mainly comprise coal powder fixed carbon, coal powder volatile components and SiO in coal powder ash 2 And Fe 2 O 3 Physical water of the pulverized coal; the coke can be converted into coal in the furnace bellyThe gas mainly contains coke fixed carbon and SiO in coke ash 2 And Fe 2 O 3 。
Optionally, the proportion of CO generated by combining fixed carbon in the coal powder and oxygen and entering coal gas of a furnace belly is 60-100%, and all volatile components are converted into CO and H 2 And N 2 And enters the furnace chamber coal gas.
Optionally, siO in the coal dust and coke ash 2 The proportion of reducing to CO and SiO is 0-50%.
Optionally, fe in the coal dust and coke ash 2 O 3 The proportion of CO reduced to CO is 50-100%.
Optionally, the oxygen in the air and the oxygen in the injection medium are combined with carbon in the coke, the coal powder and the hydrocarbon in the injection gas to form CO, and the CO is introduced into the furnace belly coal gas.
Optionally, the input of the components of the pulverized coal in the tuyere injection medium includes components of industrial analysis, ash components of the pulverized coal, and volatile components of the pulverized coal.
Optionally, the components of the blast furnace tuyere injected medium air which can be converted into furnace belly coal gas are mainly contained; nitrogen and moisture.
Optionally, the ingredient input of the air in the tuyere injection medium includes oxygen content, nitrogen content, and humidity content.
The invention has the beneficial effects that:
the method for determining the components of the gas of the blast furnace bosh injected by the multi-medium overcomes the problem of deviation of the traditional calculation method of the gas of the bosh, can accurately calculate the gas of the blast furnace bosh and the composition, provides reliable data for the calculation of important parameters of the blast furnace, namely the index of the gas of the bosh and the theoretical combustion temperature, and provides better guidance for the operation of the blast furnace.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.
Drawings
For a better understanding of the objects, aspects and advantages of the present invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:
FIG. 1 is a flow chart of the present invention.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention in a schematic way, and the features in the following embodiments and embodiments may be combined with each other without conflict.
Wherein the showings are for the purpose of illustrating the invention only and not for the purpose of limiting the same, and in which there is shown by way of illustration only and not in the drawings in which there is no intention to limit the invention thereto; for a better explanation of the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", etc., based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not an indication or suggestion that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes, and are not to be construed as limiting the present invention, and the specific meaning of the terms may be understood by those skilled in the art according to specific situations.
Please refer to FIG. 1, example 1
The embodiment relates to a method and a system for determining components of multi-medium injected blast furnace bosh gas, wherein the method for calculating the components of the low-carbon blast furnace bosh gas injected by multiple media comprises the following steps:
in step 1, the tuyere injection media in the embodiment are four media of air, coal powder (including coal injection carrier gas), coke oven gas and oxygen, and the components are respectively shown in tables 1 to 3. Wherein the coal injection carrier gas is N 2 The carrier gas ratio is 30kg/kgN 2 . The injection quantities of four media of air, coal powder, coke oven gas and oxygen are 855m respectively 3 /tHM、131.3kg/tHM、50m 3 /tHM、64m 3 /tHM。
TABLE 1 air composition, volume fraction
| Item | O 2 | N 2 | H 2 O |
| Unit of | ％ | ％ | ％ |
| Numerical value | 21 | 78 | 1 |
Table 2 blast furnace tuyere injection pulverized coal composition, mass%.
Table 3 blast furnace tuyere blast gas composition in volume%.
| CH 4 | H 2 | CO | CO 2 | N 2 | H 2 O |
| 24.80 | 63.51 | 7.85 | 2.36 | 1.48 | 0.0 |
In step 2, the composition of the coke consumed at the tuyere of the blast furnace is shown in Table 4. The coke amount consumed by the tuyere raceway is calculated to be 223.65kg/tHM by the mass conservation of the oxygen element before and after the reaction in the tuyere raceway.
Table 4 blast furnace tuyere consumed coke composition in mass%.
Step 3, the coal gas with 80 percent of CO generated by combining the coal powder fixed carbon and the oxygen and entering the furnace bosh, and Fe in the ash 2 O 3 、SiO 2 The reduction rates were 6% and 100%, respectively. Composed of coal powder, blowing amount, C + O 2 ＝2CO、C+H 2 O＝CO+H 2 、CnHm+n/2O 2 ＝nCO+m/2H 2 、CO 2 +C＝2CO、SiO 2 +C＝SiO+CO、Fe 2 O 3 + 3C=3CO2 Fe and coal dust volatile CO, H 2 、N 2 Directly enters the furnace hearth coal gas, and the furnace hearth coal gas amount generated by the coal powder can be calculated to be 193.688m 3 (tHM) where H 2 、CO、N 2 And SiO 11.822, 180.080, 1.691 and 0.095m respectively 3 /tHM。
Step 4, calculating the gas amount of the furnace belly generated by the coal powder carrier gas to be 3.502m according to the coal injection amount and the carrier gas ratio 3 /tHM。
Step 5, the coke oven gas components, C + H 2 O＝CO+H 2 、CnHm+n/2O 2 ＝nCO+m/2H 2 、CO 2 + C =2CO and H in the jet gas 2 、N 2 Directly enters the furnace hearth coal gas, and the furnace hearth coal gas amount generated by the jet blowing gas is calculated to be 75.980m 3 (tHM) where H 2 、CO、N 2 Are respectively 56.555, 18.685 and 0.740m 3 /tHM。
Step 6, injecting air according to the amount, components, C + H 2 O＝CO+H 2 And N in air 2 Directly enters the furnace bosh coal gas, and the furnace bosh coal gas amount generated by the injected air is 686.143m through calculation 3 (tHM) where H 2 、CO、N 2 Respectively 8.837, 8.837 and 668.468m 3 /tHM。
Step 7, the tuyere consumes Fe in the ash content of the coke 2 O 3 、SiO 2 The reduction rates were 6% and 100%, respectively. From the coke consumption of the tuyere,Component (C + O) 2 ＝2CO、SiO 2 +C＝SiO+CO、Fe 2 O 3 +3C=3CO +2Fe, the calculated gas amount of the furnace bosh generated by coke consumed by the tuyere is 332.683m 3 The ratio of CO to SiO is 332.392 m and 0.291m respectively 3 /tHM。
Step 8, calculating the total amount of the coal gas at the furnace bosh to be 1288.494m according to the coal gas amount calculated in the steps 3 to 7 3 (tHM) where H 2 、CO、N 2 And SiO 77.214, 539.995, 674.401, 0.386m 3 The volume fractions of the components are 5.99%, 41.91%, 52.34% and 0.03%, respectively.
Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.
Claims (10)
1. A method for determining the gas composition of a multi-medium injection blast furnace belly is characterized by comprising the following steps:
s1, determining the types of blowing media of a blast furnace tuyere, and inputting the components, the blowing amount and the coke components of each blowing media of the tuyere;
s2, calculating the coke amount consumed by the tuyere raceway by mass conservation of oxygen before and after reaction in the tuyere raceway;
s3, according to the fact that the tuyere blows the medium and the tuyere consumes the coke, the coal gas is reacted by CO and N through a tuyere convolution area 2 、H 2 And SiO 4 The characteristic of the composition of the components is calculated according to the components and the consumption of the blowing medium and the coke at the tuyere by the Gauss law 2 、H 2 And the content of SiO;
s4, according to CO and N generated by each injection medium and coke 2 、H 2 And the content of SiO, calculating the content of each component of the furnace bosh gas;
s5, calculating the total gas quantity of the furnace bosh and the proportion of each component according to the content of each component of the furnace bosh gas.
2. The method for determining the coal gas composition of the multi-medium blowing blast furnace belly according to claim 1, characterized in that the blast furnace tuyere blowing medium is air, pulverized coal, rich in CO-H 2 -CH 4 Reducing one or more of coal gas and oxygen; CO-H-enriched air is sprayed in the tuyere injection medium 2 -CH 4 The reducing gas is one or more of coke oven gas, natural gas, coal bed gas, converter gas decarburization gas, european and metallurgical furnace decarburization gas, blast furnace top decarburization gas and the like.
3. The method for determining the composition of coal gas in a multi-media injection blast furnace according to claim 2, wherein the composition of coal dust which can be converted into coal gas in the furnace is mainly coal dust fixed carbon, coal dust volatile matter, siO in coal dust ash 2 And Fe 2 O 3 Physical water of the pulverized coal; the coke can be converted into furnace gas mainly containing coke fixed carbon and SiO in coke ash 2 And Fe 2 O 3 。
4. The method for determining the coal gas composition of the multi-medium injection blast furnace belly according to claim 2, characterized in that the ratio of CO generated by combining fixed carbon in the pulverized coal and oxygen to enter the coal gas of the furnace belly is 60-100%, and all volatile components are converted into CO and H 2 And N 2 And enters the furnace chamber coal gas.
5. The method for determining the gas composition of the multi-media injection blast furnace belly according to claim 2, characterized in that SiO in the pulverized coal and coke ash 2 The proportion of reducing to CO and SiO is 0-50%.
6. The method for determining the gas composition of the multi-media injection blast furnace belly according to claim 2, characterized in that the Fe in the coal dust and the coke ash 2 O 3 The proportion of reduced CO is 50% ~ to100％。
7. The method for determining the composition of the coal gas of the multi-medium injection blast furnace belly according to claim 2, characterized in that the oxygen in the air and the oxygen in the injection medium are combined with the carbon in the carbon-containing compound in the coke, the coal powder and the injection gas to form CO, and then the CO enters the coal gas of the belly.
8. The method for determining the coal gas composition of the multi-medium injection blast furnace belly according to claim 2, characterized in that the composition input of the pulverized coal in the tuyere injection medium comprises composition components of industrial analysis components, ash components of the pulverized coal and volatile components of the pulverized coal.
9. The method for determining the composition of a gas in a multi-media injection blast furnace muffle of claim 1, wherein the composition of the gas in the blast furnace tuyere injection media is primarily convertible to the gas in the muffle; nitrogen and moisture.
10. The method of claim 1, wherein the composition inputs of air in the tuyere injection medium comprise oxygen content, nitrogen content and humidity content.
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