KR101746769B1 - Apparatus and method for mixed gas supplying - Google Patents

Apparatus and method for mixed gas supplying Download PDF

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Publication number
KR101746769B1
KR101746769B1 KR1020150137780A KR20150137780A KR101746769B1 KR 101746769 B1 KR101746769 B1 KR 101746769B1 KR 1020150137780 A KR1020150137780 A KR 1020150137780A KR 20150137780 A KR20150137780 A KR 20150137780A KR 101746769 B1 KR101746769 B1 KR 101746769B1
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South Korea
Prior art keywords
gas
blast furnace
coke oven
mixed
mixed gas
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KR1020150137780A
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Korean (ko)
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KR20170038425A (en
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김철우
박상구
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주식회사 포스코
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
    • F27D17/001—Extraction of waste gases, collection of fumes and hoods used therefor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
    • F27D17/001—Extraction of waste gases, collection of fumes and hoods used therefor
    • F27D17/002—Details of the installations, e.g. fume conduits or seals

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  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)

Abstract

The mixed gas supplying apparatus according to an embodiment of the present invention mixes the by-product gas of a steel mill and supplies a mixed gas to a heating apparatus, wherein the steelmaking by-product gas includes a FINEX gas (FOG).

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001]

The present invention relates to a mixed gas supplying apparatus and a supplying method, and more particularly to a mixed gas supplying apparatus and a mixed gas supplying method for effectively supplying a mixed gas to a heating apparatus.

Steel mills generally produce steel products through a series of processes such as steelmaking, steelmaking and rolling. The ironmaking process is a process of manufacturing molten iron from iron ore using facilities such as blast furnaces, and it is inevitable that by-product gas is generated in the ironmaking process. At the steelworks, these byproduct gases are recovered from energy saving and environmental protection and used as fuel sources for heating furnaces and power plants.

Korean Patent Laid-Open Publication No. 10-2012-0000785 (2012.04.04. Disclosed)

An object of the present invention is to provide a mixed gas supplying apparatus and a mixed gas supplying method for effectively supplying a mixed gas to a heating apparatus.

Other objects of the present invention will become more apparent from the following detailed description and drawings.

The mixed gas supplying apparatus according to an embodiment of the present invention mixes the by-product gas of a steel mill and supplies a mixed gas to a heating apparatus, wherein the steelmaking by-product gas includes a FINEX gas (FOG).

The mixed gas may include coke oven gas (COG), blast furnace gas (BFG), and FINEX gas (FOG).

The mixed gas supply device may supply the mixed gas to supply the predetermined amount of heat to the heating device.

The mixed gas supply device includes a coke oven gas piping member for providing a path for moving the coke oven gas; A blast furnace gas pipe member for providing a path for moving the blast furnace gas; A fine gas piping member for providing a path of movement of the final gas; A mixed gas piping member connected at one end to the coke oven gas piping member, the blast furnace gas piping member, and the FINEX gas piping member to provide a moving path of the mixed gas; A coke oven gas valve member disposed on the coke oven gas piping member and capable of adjusting a flow rate of the coke oven gas; A blast furnace gas valve member disposed on the blast furnace gas pipe member and capable of adjusting a flow rate of the blast furnace gas; And a final gas valve member disposed on the final gas pipe member and capable of adjusting a flow rate of the final gas.

Wherein the mixed gas supply device includes a control unit connected to the coke oven gas valve member, the blast gas valve member, and the FINEX gas valve member to control a supply flow rate of the coke oven gas, the blast furnace gas, and the FINEX gas; And a calorimetric measurement unit for measuring the amount of heat supplied to the heating device by the mixed gas and transmitting the calorimetric signal to the control unit.

The control unit may control the blast furnace gas valve member so that a supply heat amount of 1050 to 1250 kcal / Nm 3 is supplied to the heating equipment.

The method for supplying a mixed gas according to an embodiment of the present invention includes: a mixed gas generating step of mixing a by-product gas containing a finox gas (FOG) to produce a mixed gas; A mixed gas supplying step of supplying the mixed gas to a heating apparatus; A supply calorie measurement step of measuring a supply calorie supplied to the heating equipment by the mixed gas; And a control step of controlling the mixing ratio of the mixed gas when the supplied heat amount is out of a preset calorie range.

The mixed gas may include coke oven gas (COG), blast furnace gas (BFG), and FINEX gas (FOG).

The controlling step may decrease the blast furnace gas ratio included in the mixed gas when the supplied heat amount is less than 1050 kcal / Nm 3 .

The controlling step may increase the blast furnace gas ratio included in the mixed gas when the supplied heat amount exceeds 1250 kcal / Nm 3 .

Since the mixed gas supplying apparatus and the supplying method according to the embodiment of the present invention supply the mixed gas in which the finox gas (FOG) is mixed with the coke oven gas (COG) and the blast furnace gas (BFG) It is possible to effectively suppress the generation of contaminants and effectively supply the heat amount required in the heating equipment.

1 is a schematic view of a mixed gas supply apparatus according to an embodiment of the present invention.
2 is a schematic view showing a flow chart of a mixed gas supply method according to an embodiment of the present invention.

The present invention relates to a mixed gas supplying apparatus and a supplying method, and an embodiment of the present invention will be described below with reference to the accompanying drawings. The embodiments of the present invention can be modified in various forms, and the scope of the present invention should not be construed as being limited to the embodiments described below. The embodiments are provided to explain the present invention to a person having ordinary skill in the art to which the present invention belongs. Accordingly, the shape of each element shown in the figures may be exaggerated to emphasize a clearer description. Also, the connection referred to below should be construed to include not only when two components are directly connected but also indirectly connected through another medium.

Blast furnace gas (BFG), coke oven gas (COG), and converter gas (Linz Donawitze Gas, LDG) are the by-products of the steelworks. In recent years, Finex has been developed to produce molten iron by directly using iron ore and coal in the form of spectra, and Finex Off Gas (FOG) generated from the FINEX plant is also included in these byproduct gases .

When the by-product gas is used as the heat source of the heating system 40, there arises a problem of environmental pollution due to the emission of NO x , SO x, and the like, which are generated during combustion of the by-product gas, and the dissipation of the by-product gas during operation. Particularly when the coke oven gas (COG) and the blast furnace gas (BFG) are mixed and supplied to the heating equipment 40, the case where the coke oven gas (COG) is supplied solely to the heating equipment 40 However, the coke oven gas (COG) contains water-soluble impurities such as hydrogen sulfide (H 2 S), hydrogen cyanide (HCN) and ammonia (NH 3 ), and benzene, toluene, xlyene, tar And naphthalene. Therefore, when coke oven gas (COG) is used alone in the heating apparatus 40, a large amount of air pollutants are generated. The present invention relates to a mixed gas supply device capable of maintaining the amount of heat supplied by by-product gas at a predetermined level or higher and effectively suppressing the discharge of environmental pollutants when the by-product gas is used as a heat source of the heating device (40) Supply method.

1 is a schematic view of a mixed gas supply apparatus according to an embodiment of the present invention.

As shown in FIG. 1, the mixed gas supplying apparatus according to an embodiment of the present invention includes piping members 12, 22, 32 (see FIG. 1) for providing a moving path of a by- , 42). The piping members 12, 22, 32, and 42 include a coke oven gas piping member 12, one end of which is connected to the coke oven facility 10 to provide a path for moving the coke oven gas (COG) A blast furnace gas pipe member 22 connected to the furnace 20 and providing a path for the blast furnace gas BFG, a fin gas pipe member 22 having one end connected to the FINEX facility 30 to provide a path for the flow of the FINEX gas FOG, (COG), blast furnace gas (BFG), and FINEX gas (BFG) are connected at one end to the coke oven gas piping member 32, the coke oven gas piping member 12, the blast furnace gas piping member 22 and the FINEX gas piping member 32, And a mixed gas piping member 42 for providing a moving path of the mixed gas in which the mixed gas FOG is mixed.

A coke oven gas valve member 14, a blast furnace gas valve member 24 and a FINEX gas valve member 34 are disposed on the coke oven gas piping member 12, the blast furnace gas pipe member 22 and the FINEX gas pipe member 32, (COG), blast furnace gas (BFG), and FINEX gas (FOG) are controlled by controlling the opening degree of the coke oven gas valve member 14, the blast gas valve member 24 and the FINEX gas valve member 34, ) Each supply flow rate is adjusted. The mixed gas valve member 44 may be disposed on the mixed gas pipe member 42 and the supply flow rate of the mixed gas supplied to the heating equipment 40 may be adjusted by controlling the opening degree of the mixed gas valve member 44 have.

1 shows a coke oven battery system as an example of the heating system 40, the heating system 40 of the present invention is not necessarily limited thereto. That is, the heating system 40 may include not only the coke oven battery system, but also all utilities that use the by-product gas such as a heating furnace, a power plant, and the like.

The calorimetric unit 60 measures the amount of heat supplied to the heating system 40 by the mixed gas and transmits the calorific value signal to the control unit 50 accordingly. The control unit 50 controls the opening degree of the blast furnace gas valve member 24 to regulate the amount of heat supplied when the amount of heat supplied to the heating furnace 40 is out of a predetermined calorie range. At the same time, the control unit 40 can control the opening degree of the coke oven gas valve member 14 and the final gas valve member 34, so that a constant flow rate of the mixed gas can be supplied to the heating equipment 40.

2 is a schematic view showing a flow chart of a mixed gas supply method according to an embodiment of the present invention.

2, the method for supplying a mixed gas according to an embodiment of the present invention includes a step of generating a mixed gas (S100), a mixed gas supplying step (S200), a step of measuring a supplied calorie (S300), and a controlling step (S400) . In the mixed gas generating step S100, the COG oven gas COG produced as a by-product in the coke oven facility 10, the blast furnace gas BFG produced as a by-product in the blast furnace facility 20, and the FINEX gas FOG In the mixed gas supply step (S200), the mixed gas generated in the mixed gas generating step (S100) is supplied to the heating equipment (40).

In the supply calorie measurement step S300, the supply calorie supplied to the heating equipment 40 is measured. In the control step S400, the mixing ratio of the mixture gas is controlled according to the calorific value measured in the supply calorie measurement step S300 . In view of the process conditions of the heating equipment 40, it is preferable that the amount of heat supplied to the heating equipment 40 by the mixed gas is 1050 to 1250 kcal / Nm 3 . Accordingly, in the control step (S400), when the supplied heat amount is out of the range of 1050 to 1250 kcal / Nm 3 , the amount of the supplied gas is controlled by adjusting the ratio of the blast gas (BFG) contained in the mixed gas.

The specific method of controlling the amount of the supplied gas by controlling the ratio of the blast gas (BFG) contained in the mixed gas is as follows. If the calorific value measured in the step of measuring the amount of heat supplied (S300) is less than 1050 kcal / Nm 3 , the proportion of the blast furnace gas (BFG) contained in the mixed gas is reduced. When the supplied amount of heat measured at the supply heat quantity measuring step (S300) exceeds 1250 kcal / Nm 3, thereby increasing the rate of blast furnace gas (BFG) contained in the mixed gas.

The amount of heat generated per unit volume increases in the order of the blast furnace gas (BFG), the finox gas (FOG) and the coke oven gas (COG). And / or by increasing the ratio of coke oven gas (COG). Conversely, when the amount of supplied heat is exceeded, the amount of heat supplied can be effectively reduced by increasing the proportion of the blast furnace gas (BFG) and reducing the proportion of the FINEX gas (FOG) and / or the coke oven gas (COG).

The mixed gas supplying apparatus and the supplying method according to the embodiment of the present invention mix the coke oven gas (COG), the blast furnace gas (BFG) and the finox gas (FOG) and supply them as a heat source to the heating equipment 40, It is possible to effectively reduce the material and at the same time to efficiently supply the heat quantity required in the heating equipment 40. [

Table 1 below shows samples of coke oven gas (COG), blast furnace gas (BFG), and FINEX gas (FOG) and their respective components were analyzed.

Component (unit) COG BFG FOG O 2 (%) 0.23 0.014 0 CO (%) 6.758 27.274 38.243 CO 2 (%) 2.564 21.46 29.942 H 2 (%) 54.703 3.114 12.64 CH 4 (%) 24.674 0.36 0.85 COS (ppm) 0.43 0.07 0.07 SO 2 (ppm) 26.109 23.304 11.622 H 2 S (ppm) 804.698 3.81 34 CS 2 (ppm) 27.97 0.07 - Benzene (ppm) 1135.259 0.324 5.592 Toluene (ppm) 238.216 0.076 0.725 Ethylbenzene (ppm) 0.286 0.0076 0.075 Styrene (ppm) 5.59 0.0096 0.011 Xylene (ppm) 13.071 0.026 0.132 Naphthalene (ppm) 199.066 0.468 3.852 NH 3 (ppm) 318.091 0.714 0.4 HCN (ppm) 139.428 59.986 0.05

As shown in Table 1, the blast furnace gas (BFG) and the finox gas (FOG) samples had higher CO and CO 2 contents than the coke oven gas (COG) samples, while the sulfur (S) or nitrogen (N) It can be confirmed that the content of the component is significantly low. Therefore, it can be confirmed that, when the FINEX gas (FOG) is mixed with the coke oven gas (COG) and the blast furnace gas (BFG) and supplied to the heating equipment, the environmental pollutants such as SO x or NO x are effectively suppressed.

Table 2 below shows the results of measuring the amount of heat supplied to the heating equipment 40 by supplying the gas mixture of the coke oven gas (COG) and the blast furnace gas (BFG) to the heating equipment 40, (COG), blast furnace gas (BFG), and FINEX gas (FOG) to the heating equipment 40 according to an embodiment of the present invention to supply the heating equipment 40 with the heat The results are shown in Table.

Gas Calories (kcal / Nm 3 ) Flow rate (kNm 3 / h) Total calories (Gcal / h) Total calorific value (kcal / Nm 3 ) BFG 801 123.6
149.3

1101
COG 4187 12.1 total - 135.6

Gas Calories (kcal / Nm 3 ) Flow rate (kNm 3 / h) Total calories (Gcal / h) Total calorific value (kcal / Nm 3 ) BFG 801 62.0
148.8


1190

COG 4187 5.0 FOG 1348 59.5 total - 126.5

As shown in Tables 2 and 3, when a mixed gas of coke oven gas (COG), blast furnace gas (BFG) and FINEX gas (FOG) is used, coke oven gas (COG) and blast furnace gas Comparing the case of using one gas, it is confirmed that the supply amount of coke oven gas (COG) is remarkably reduced, whereas the total amount of supplied heat is in a similar numerical value range. That is, when the coke oven gas (COG), the blast furnace gas (BFG), and the finox gas (FOG) are mixed, the same amount of heat is supplied as in the case where the coke oven gas (COG) and the blast furnace gas Can be confirmed.

Table 4 below shows the relationship between the coke oven gas (COG), the blast furnace gas (BFG), and the FINEX gas (BFG) when the coke oven gas (COG) (FOG) are mixed with each other, the components of the exhaust gas discharged from the heating equipment 40 are analyzed.

COG COG + BFG COG + BFG + FOG SOx (ppm) 135 64 5 to 6 NOx (ppm) 323 52 52 or less O 2 (%) 11 6 5 to 6 Flow rate (Nm 3 / hr) 70365 69262 70000 Temperature (℃) 172 170 170

As shown in Table 4, when the coke oven gas (COG), the blast furnace gas (BFG) and the FINEX gas (FOG) are mixed and used according to an embodiment of the present invention, as compared with the case a mixture of coke oven gas (COG) as blast furnace gas (BFG) is confirmed that the SO X and NO X emissions are significantly reduced.

Therefore, the mixed gas supplying apparatus and the supplying method of the present invention supply the mixed gas containing the coke oven gas (COG) and the blast furnace gas (BFG) as the heat source of the heating equipment, Generation of heat can be effectively suppressed and the amount of heat required by the heating equipment can be effectively supplied.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, Therefore, the technical idea and scope of the claims set forth below are not limited to the embodiments.

1: Mixed gas supply device 10: Coke oven facility
12: Coke oven gas piping member 14: Coke oven gas valve member
20: Blast furnace facility 22: Blast furnace gas pipe member
24: Blast furnace gas valve member 30: FINEX facility
32: FINEX gas pipe member 34: FINEX gas valve member
40: Heating equipment 42: Mixed gas piping member
44: mixed gas valve member 50: control unit
60: Calorimetric unit

Claims (10)

A mixed gas supply apparatus for supplying a mixed gas in which a by-product gas of a steel mill is mixed to a heat source of a heating apparatus,
Wherein the mixed gas supply device comprises:
A coke oven gas piping member for providing a moving path of coke oven gas (COG);
A blast furnace gas pipe member for providing a moving path of the blast furnace gas (BFG);
A Finace gas piping member for providing a movement path of the FINEX gas (FOG);
The blast furnace gas pipe member, the blast furnace gas pipe member, and the final gas pipe member, and is connected to the heating device, and is connected to the combustion gas pipe, the blast furnace gas pipe member, A mixed gas piping member for providing a moving path;
A coke oven gas valve member disposed on the coke oven gas piping member and capable of adjusting a flow rate of the coke oven gas;
A blast furnace gas valve member disposed on the blast furnace gas pipe member and capable of adjusting a flow rate of the blast furnace gas;
A final gas valve member disposed on the final gas piping member and capable of adjusting a flow rate of the final gas;
A control unit connected to the coke oven gas valve member, the blast furnace gas valve member, and the FINEX gas valve member to control a supply flow rate of the coke oven gas, the blast furnace gas, and the FINEX gas; And
And a calorimetric measurement unit for measuring a calorific value supplied to the heating device by the gas mixture and transmitting a calorimetric signal to the control unit,
Wherein the control unit controls the blast furnace gas valve member according to a calorific value signal to control the supply heat quantity to satisfy a predetermined calorie range. delete delete delete delete The method according to claim 1,
Wherein the predetermined amount of heat supplied is 1050 to 1250 kcal / Nm 3 . A mixed gas producing step of producing a mixed gas including coke oven gas (COG), blast furnace gas (BFG) and FINEX gas (FOG);
A mixed gas supplying step of supplying the mixed gas to a heating apparatus;
A supply calorie measurement step of measuring a supply calorie supplied to the heating equipment by the mixed gas; And
And controlling the mixing ratio of the mixed gas by controlling a ratio of the blast furnace gas contained in the mixed gas when the supplied heat amount is out of a preset calorie range. delete 8. The method of claim 7,
Wherein the control step comprises:
Wherein the ratio of the blast furnace gas contained in the mixed gas is reduced when the supplied heat quantity is less than 1050 kcal / Nm < 3 & gt ;. 8. The method of claim 7,
Wherein the control step comprises:
Wherein the ratio of the blast furnace gas included in the mixed gas is increased when the supplied heat amount exceeds 1250 kcal / Nm < 3 & gt ;.
KR1020150137780A 2015-09-30 2015-09-30 Apparatus and method for mixed gas supplying KR101746769B1 (en)

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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100703557B1 (en) * 2005-12-21 2007-04-03 주식회사 포스코 A mixing method of off-gases from steel works to reduce fluctuation of the heating value of the mixed gas

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20120000785A (en) 2010-06-28 2012-01-04 현대제철 주식회사 Apparatus for controlling heating value of by-product gases using tail gas of formation process and method therefor

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100703557B1 (en) * 2005-12-21 2007-04-03 주식회사 포스코 A mixing method of off-gases from steel works to reduce fluctuation of the heating value of the mixed gas

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