CN221028517U - Oxygen enrichment system in front of long-distance blast furnace smelting machine - Google Patents
Oxygen enrichment system in front of long-distance blast furnace smelting machine Download PDFInfo
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- 239000001301 oxygen Substances 0.000 title claims abstract description 333
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 333
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims abstract description 275
- 238000003723 Smelting Methods 0.000 title claims abstract description 22
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 110
- 229910052757 nitrogen Inorganic materials 0.000 claims description 55
- 238000000926 separation method Methods 0.000 claims description 13
- 230000001105 regulatory effect Effects 0.000 claims description 9
- 230000001276 controlling effect Effects 0.000 claims description 7
- 238000000034 method Methods 0.000 abstract description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 22
- 230000008901 benefit Effects 0.000 description 14
- 229910052742 iron Inorganic materials 0.000 description 11
- 229910000831 Steel Inorganic materials 0.000 description 9
- 239000010959 steel Substances 0.000 description 9
- 239000007789 gas Substances 0.000 description 8
- 239000000571 coke Substances 0.000 description 7
- 238000004134 energy conservation Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 230000009977 dual effect Effects 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000003063 flame retardant Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 230000008093 supporting effect Effects 0.000 description 1
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Abstract
The utility model discloses a long-distance oxygen enrichment system in front of a blast furnace smelting machine, which comprises a first air filter, a second air filter and a third air filter, wherein the first air filter is communicated with a first blower through a first air-oxygen mixer, the second air filter is communicated with a second blower through a second air-oxygen mixer, and the third air filter is communicated with a third blower through a third air-oxygen mixer; the first air-oxygen mixer, the second air-oxygen mixer and the third air-oxygen mixer are respectively used for increasing normal pressure oxygen into air output by the first air filter, the second air filter and the third air filter, and finally, the air is conveyed to the first blower, the second blower and the third blower. The method solves the problems that the mixing degree of oxygen enriched in front of the existing blast furnace machine and air is not high, and the safety performance of the system is not high.
Description
[ Field of technology ]
The utility model belongs to the technical field of blast furnace smelting, and particularly relates to a long-distance oxygen enrichment system in front of a blast furnace smelting machine.
[ Background Art ]
In order to raise the theoretical temperature of the blast furnace to strengthen the combustion of the injected fuel before the tuyere and thus to raise iron making yield and smelting strength, modern blast furnaces adopt oxygen-enriched blast technology. The blast furnace oxygen-enriched blast mode comprises after-machine oxygen enrichment and before-machine oxygen enrichment, and the after-machine oxygen enrichment is a mode which is adopted by many iron and steel enterprises. Through years of practice, it has been found that a large amount of compressed oxygen must be consumed in the post-machine oxygen enrichment process, which can result in a large amount of electrical energy consumption. In order to relieve the dual pressure of cost and environmental protection, the after-machine oxygen-enriched mode is gradually eliminated, and the more energy-saving before-machine oxygen-enriched technology is gradually popularized and applied in more and more iron and steel enterprises. The air-oxygen mixer is an important device for pre-machine oxygen enrichment, and the mixing uniformity degree has a certain influence on the oxygen enrichment rate of the blast furnace. The oxygen enrichment project in front of the blast furnace is one of important cost reduction and synergy projects facing severe cost pressure and market environment.
The existing oxygen enrichment before the blast furnace is mostly realized by adopting a simple mixer mixed from one side or two sides, the mixing degree of the oxygen and the air is not high, and the problems of low system safety performance and the like exist.
[ utility model ]
The utility model aims to provide a long-distance oxygen-enriched system in front of a blast furnace smelting machine, which aims to solve the problems that the mixing degree of oxygen-enriched oxygen and air in front of the existing blast furnace smelting machine is low and the safety performance of the system is low.
The utility model adopts the following technical scheme: the oxygen enrichment system comprises a first air filter, a second air filter and a third air filter, wherein the first air filter is communicated with a first blower through a first air-oxygen mixer, the second air filter is communicated with a second blower through a second air-oxygen mixer, and the third air filter is communicated with a third blower through a third air-oxygen mixer;
The first air-oxygen mixer is communicated to an air separation unit through a first oxygen pipeline, the second air-oxygen mixer is communicated to the same air separation unit through a second oxygen pipeline, the third air-oxygen mixer is communicated to the first oxygen pipeline through a third oxygen pipeline, and the third air-oxygen mixer is communicated to the second oxygen pipeline through a fourth oxygen pipeline;
The air separation unit is used for providing normal pressure oxygen for the first air oxygen mixer, the second air oxygen mixer and the third air oxygen mixer; the first air-oxygen mixer, the second air-oxygen mixer and the third air-oxygen mixer are respectively used for increasing normal pressure oxygen into air output by the first air filter, the second air filter and the third air filter, and finally, the air is conveyed to the first blower, the second blower and the third blower;
The first oxygen pipeline, the second oxygen pipeline, the third oxygen pipeline and the fourth oxygen pipeline are all provided with manual cut-off valves, and each manual cut-off valve is used for controlling the on-off of the oxygen pipeline through the on-off of the manual cut-off valves.
Further, the air separation unit is respectively communicated with the first oxygen pipeline and the second oxygen pipeline through a main pipe cut-off valve; and the first oxygen pipeline and the second oxygen pipeline are sequentially provided with a second branch pipe cut-off valve, a flowmeter, an oxygen filter, a starting regulating valve, an oxygen pneumatic quick-cut valve, a flame arrester and an oxygen content analyzer along the oxygen output direction.
Further, the device also comprises a safety nitrogen pipeline, the safety nitrogen pipeline comprises a nitrogen main pipeline, the output end of the nitrogen main pipeline is divided into a first nitrogen branch and a second nitrogen branch, the first nitrogen branch is communicated with the second oxygen pipeline through a first pneumatic quick-opening valve, and the second nitrogen branch is communicated with the first oxygen pipeline through a second pneumatic quick-opening valve.
Further, a first stop valve, a nitrogen tank and a second stop valve are sequentially arranged on the nitrogen main pipeline along the air inlet direction.
The beneficial effects of the utility model are as follows: the utility model adds an air-oxygen mixer between the blower and the air filter, communicates the air-separating unit with the air-oxygen mixer, and conveys normal pressure oxygen to the air-oxygen mixer, and conveys the mixed gas to the blower for blast furnace oxygen enrichment. Three blowers are arranged, wherein a third blower is a standby blower, the blowers adopt a two-to-one operation mode, and two blowers are selected to work normally by controlling valves on pipelines communicated with the blowers. The safety nitrogen pipeline is respectively communicated with the first oxygen pipeline and the second oxygen pipeline, and the oxygen content in the first oxygen pipeline and/or the second oxygen pipeline exceeds the standard, namely, the oxygen content can be reduced by closing the oxygen input of the first oxygen pipeline and/or the second oxygen pipeline and then introducing nitrogen into the first oxygen pipeline and/or the second oxygen pipeline, so that the safety of operators and equipment and facilities can be protected. The utility model has the advantages of relatively simple structure, good gas mixing effect, convenient operation, energy conservation and cost reduction, can improve the smelting strength of the blast furnace after being used, is favorable for the smooth running of the blast furnace condition, has considerable economic benefit and can also achieve the aims of energy conservation and emission reduction.
[ Description of the drawings ]
FIG. 1 is a schematic diagram of a system for oxygen enrichment in front of a long-distance blast furnace smelting machine according to the present utility model.
The system comprises a space division unit 1, a main pipe cut-off valve 2, a branch pipe cut-off valve 3, a flowmeter 4, an oxygen filter 5, a pneumatic regulating valve 6, a flame arrester 8, an oxygen on-line detector 13, a first cut-off valve 15, a nitrogen tank 16, a second cut-off valve 17, and an oxygen content analyzer 19.
101. A first air filter, 102, a second air filter, 103, a third air filter;
111. A first air-oxygen mixer 112, a second air-oxygen mixer 113, a third air-oxygen mixer;
141. A first blower 142, a second blower 143, a third blower;
181. the first pneumatic quick-opening valve 182;
201. The device comprises a first oxygen pipeline, a second oxygen pipeline, a third oxygen pipeline, a fourth oxygen pipeline, a nitrogen main pipeline, a first nitrogen branch pipeline, a second nitrogen branch pipeline and a third oxygen pipeline, wherein the first oxygen pipeline, the second oxygen pipeline, the third oxygen pipeline, the fourth oxygen pipeline and the nitrogen main pipeline;
701. a first oxygen pneumatic fast-cut valve 702;
901. First manual shut-off valve 902, second manual shut-off valve 903, third manual shut-off valve 904, fourth manual shut-off valve 905, fifth manual shut-off valve.
[ Detailed description ] of the invention
The utility model will be described in detail below with reference to the drawings and the detailed description.
The utility model provides a long-distance pre-blast furnace smelting machine oxygen enrichment system, which is shown in fig. 1, and comprises a first air filter 101, a second air filter 102 and a third air filter 103, wherein the first air filter 101 is communicated with a first blower 141 through a first air-oxygen mixer 111, the second air filter 102 is communicated with a second blower 142 through a second air-oxygen mixer 112, and the third air filter 103 is communicated with a third blower 143 through a third air-oxygen mixer 113. Wherein the air-oxygen mixer is a mixing device of air and oxygen, for example, an oxygen-enriched mixer used in front of a blast furnace for iron and steel smelting in the prior art with the authorized bulletin number of CN217988942U can be used for realizing the full mixing of the air and the oxygen.
Wherein, the first air-oxygen mixer 111 is connected to an air separation unit 1 through a first oxygen pipeline 201, the second air-oxygen mixer 112 is connected to the same air separation unit 1 through a second oxygen pipeline 202, the third air-oxygen mixer 113 is connected to the first oxygen pipeline 201 through a third oxygen pipeline 203, and the third air-oxygen mixer 113 is connected to the second oxygen pipeline 202 through a fourth oxygen pipeline 204;
The air separation unit 1 is used for providing normal pressure oxygen for the first air-oxygen mixer 111, the second air-oxygen mixer 112 and the third air-oxygen mixer 113; the first, second and third air-oxygen mixers 111, 112 and 113 are used to increase atmospheric oxygen to the air output from the first, second and third air filters 101, 102 and 103, respectively, and finally to the first, second and third blowers 141, 142 and 143.
The pre-oxygen-enriched system uses normal pressure oxygen, the normal pressure oxygen has the medium characteristics of oxidizing property and combustion supporting property, the higher the oxygen pressure is, the greater the danger is, the normal pressure oxygen reduces the danger of the system, the safety of equipment and facility systems is ensured, and the pressure of an oxygen pipeline exceeds 0.1Mpa and is a pressure-bearing special equipment pipeline.
The first oxygen pipeline 201, the second oxygen pipeline 202, the third oxygen pipeline 203 and the fourth oxygen pipeline 204 are all provided with manual shut-off valves, and each manual shut-off valve is used for controlling the on-off of the oxygen pipeline through the on-off of the manual shut-off valves. The third oxygen pipeline 203 and the fourth oxygen pipeline 204 are respectively communicated with the first oxygen pipeline 201 and the second oxygen pipeline 202, when the first blower 141 or the second blower 142 fails or is in a halt state, the third oxygen pipeline 203 or the fourth oxygen pipeline 204 can be opened by controlling the manual cut-off valves arranged on the oxygen pipelines so as to connect the third blower 143, two blowers are guaranteed to keep running all the time, and the two-in-one operation mode of the blowers is realized.
The first air-oxygen mixer 111 is respectively connected with air through the first air filter 101, and is connected with oxygen through the first oxygen pipeline 201, and the normal pressure oxygen loop and the air loop are relatively independent, so that the cleaning and the control of the two gases are facilitated. The filter screen or filter element of the first air filter 101 can effectively filter pollutants and particulate matters in the air, so that the air quality is improved; the air and oxygen entering the mixing chamber are uniformly mixed by the axially extending baffle plates of the first air-oxygen mixer 111, so that uniform mixing of the gases is ensured. The second air-oxygen mixer 112 and the third air-oxygen mixer 113 are the same as the first air-oxygen mixer 111, and have advantages of facilitating cleaning and control of both gases, improving air quality, and ensuring uniform mixing of the gases.
In some embodiments, the air separation unit 1 is respectively communicated to the first oxygen pipeline 201 and the second oxygen pipeline 202 through the main pipe shut-off valve 2; the first oxygen pipeline 201 and the second oxygen pipeline 202 are respectively provided with a second branch pipe cut-off valve 3, a flowmeter 4, an oxygen filter 5, a start regulating valve 6, an oxygen pneumatic quick cut-off valve, a flame arrester 8 and an oxygen content analyzer 19 in sequence along the oxygen output direction. The main pipe cut-off valve 2 is respectively communicated with the first oxygen pipeline 201 and the second oxygen pipeline 202, so that the two oxygen pipelines can be reliably cut off, and the safety operation of personnel on the two oxygen pipelines is facilitated.
In some embodiments, the apparatus further comprises a safety nitrogen pipeline, the safety nitrogen pipeline comprises a main nitrogen pipeline 205, the output end of the main nitrogen pipeline 205 is divided into a first nitrogen branch 206 and a second nitrogen branch 207, the first nitrogen branch 206 is connected to the second oxygen pipeline 202 through the first pneumatic quick-opening valve 181, and the second nitrogen branch 207 is connected to the first oxygen pipeline 201 through the second pneumatic quick-opening valve 182. The first pneumatic quick-opening valve 181 and the second pneumatic quick-opening valve 182 are used for controlling the on-off of the nitrogen branch circuits where the first pneumatic quick-opening valve and the second pneumatic quick-opening valve are located. Under emergency, the pneumatic quick-opening valve is quickly opened to flush nitrogen, so that safety of operators and equipment and facilities is protected. During normal starting, the safety nitrogen with sufficient pressure is also filled in front of the first pneumatic quick-opening valve 181 and the second pneumatic quick-opening valve 182, so that the quick response speed of the nitrogen pipeline in emergency is improved, and the safety of the oxygen pipeline is improved.
In some embodiments, a first shutoff valve 15, a nitrogen tank 16, and a second shutoff valve 17 are provided in this order along the intake direction on the nitrogen main pipe. The safety nitrogen enters the nitrogen tank 16 through the first stop valve 15 to store and maintain pressure, the second stop valve 17 and the pneumatic quick-opening valve are arranged behind the nitrogen tank 16, and pure oxygen in the branch pipe is replaced and emptied by adopting the nitrogen during the period of blast furnace damping down or fan stopping. The storage and adjustment of nitrogen supply are convenient, the nitrogen pressure is balanced, and the emergency air source is provided by the security nitrogen pipeline.
The utility model discloses a control method of an oxygen enrichment system in front of a long-distance blast furnace smelting machine, which comprises the following steps:
A first manual cut-off valve 901 is arranged at the position, close to the first air-oxygen mixer 111, of the first oxygen pipeline 201, a second manual cut-off valve 902 is arranged at the position, close to the second air-oxygen mixer 112, of the second oxygen pipeline 202, a third manual cut-off valve 903 is arranged at the position, close to the first oxygen pipeline 201, of the third oxygen pipeline 203, and a fourth manual cut-off valve 904 and a fifth manual cut-off valve 905 are respectively arranged at two positions, close to the second oxygen pipeline 202 and the third air-oxygen pipeline, of the fourth oxygen pipeline 204;
The control method comprises the following steps:
Mode 1: when the oxygen content in the first oxygen line 201 and the second oxygen line 202 is not more than 28%, and the first blower 141 and the second blower 142 are operating normally:
The third manual cutoff valve 903, the fourth manual cutoff valve 904, and the fifth manual cutoff valve 905 are closed; opening the first manual shut-off valve 901 and the second manual shut-off valve 902;
Oxygen passes through first oxygen line 201 and second oxygen line 202, enters first air oxygen mixer 111 and second air oxygen mixer 112, respectively, and is then directed to first blower 141 and second blower 142, respectively, for blast furnace oxygen enrichment.
Mode 2: when the oxygen content in the first oxygen line 201 and the second oxygen line 202 is not more than 28% and the first blower 141 is suspended, the second blower 142 is operated normally:
The fourth manual shut-off valve 904, the second manual shut-off valve 902 and the third manual shut-off valve 903 are opened,
The third manual cut-off valve 903 and the first manual cut-off valve 901 are closed,
Atmospheric oxygen is sent to the second blower 142 through the second oxygen pipeline 202 and the second air-oxygen mixer 112 for blast furnace oxygen enrichment; the atmospheric oxygen is also sent to the third blower 143 through the fourth oxygen pipeline 204 and the third air-oxygen mixer 113 to perform blast furnace oxygen enrichment.
Mode 3: when the oxygen content in the first oxygen line 201 and the second oxygen line 202 is not more than 28% and the second blower 142 is suspended, the first blower 141 is operated normally:
the third manual cutoff valve 903 and the fifth manual cutoff valve 905 are opened; closing the fourth manual shut-off valve 904, the first manual shut-off valve 901, and the second manual shut-off valve 902;
Atmospheric oxygen is sent to the first blower 141 through the first oxygen pipeline 201 and the first air-oxygen mixer 111 to perform blast furnace oxygen enrichment; atmospheric oxygen is also sent to the third blower 143 through the third oxygen pipeline 203 and the third air oxygen mixer 113 for blast furnace oxygen enrichment.
Mode 4: the oxygen pneumatic quick-cut valve on the first oxygen pipeline 201 is a first oxygen pneumatic quick-cut valve 701, and the oxygen pneumatic quick-cut valve on the second oxygen pipeline 202 is a second oxygen pneumatic quick-cut valve 702; when any one working condition of starting, stopping and surging of the blower occurs to any one blower, the corresponding oxygen pneumatic quick-cutting valve needs to be cut off, so that the safety of the system is protected.
Specifically, when the oxygen content in the first oxygen pipeline 201 exceeds 28%, the first oxygen pneumatic quick-cut valve 701 is closed, and the second pneumatic quick-open valve 182 is opened to introduce nitrogen into the first oxygen pipeline 201. It should be noted that when the oxygen content of the air inlet pipeline exceeds 28%, the nitrogen pneumatic quick-opening valve is automatically opened, the oxygen pneumatic quick-opening valve is closed, and the oxygen pneumatic quick-opening valve is not allowed to be opened before the normal state is restored.
The first oxygen pneumatic quick-cut valve 701 is opened and the second pneumatic quick-open valve 182 is closed when the oxygen content in the first oxygen pipeline 201 is lower than 28% by real-time measurement by the oxygen content analyzer 19 on the first oxygen pipeline 201. The oxygen content is monitored by an oxygen on-line detector, whether the preset oxygen content is reached or not is automatically judged, and the valve position of the oxygen pneumatic regulating valve is controlled.
Mode 5: when the oxygen content in the second oxygen pipeline 202 exceeds 28%, the second oxygen pneumatic quick-cut valve 702 is closed, and the first pneumatic quick-open valve 181 is opened to introduce nitrogen into the second oxygen pipeline 202. It should be noted that when the oxygen content of the air inlet pipeline exceeds 28%, the nitrogen pneumatic quick-opening valve is automatically opened, the oxygen pneumatic quick-opening valve is closed, and the oxygen pneumatic quick-opening valve is not allowed to be opened before the normal state is restored.
The second oxygen pneumatic quick-cut valve 702 is opened and the first pneumatic quick-open valve 181 is closed when the oxygen content in the second oxygen pipeline 202 is lower than 28% by real-time measurement by the oxygen content analyzer 19 on the second oxygen pipeline 202. The oxygen content is monitored by an oxygen on-line detector, whether the preset oxygen content is reached or not is automatically judged, and the valve position of the oxygen pneumatic regulating valve is controlled.
The utility model can adopt two control modes of full automation and PLC manual operation to realize the control method of the oxygen enrichment system in front of the long-distance blast furnace smelting machine. Under the automatic mode, the system realizes the automatic control of the oxygen enrichment of the blast furnace through the oxygen content (or the oxygen flow) of the oxygen enriched air and the opening and closing of the oxygen regulating valve. The PID module in the PLC system calculates the opening of the regulating valve according to the PV value and the set value SP (the blast furnace is given in real time), and realizes the automatic control of the fixed oxygen enrichment rate (or the fixed oxygen enrichment). In the manual PLC mode, an operator sets the opening of the regulating valve from an operator station according to operation experience, and the oxygen flow is manually controlled.
Examples
In order to solve the problem of contradiction between oxygen supply and demand in high-efficiency smelting of iron-making, a certain company researches the oxygen utilization condition of surrounding industrial and mining enterprises, and finally determines that the surplus oxygen of the enterprises within 4 km around is led to perform 1800m 3 of blast furnace front oxygen enrichment. The benefits produced are as follows:
(1) The implementation effect is as follows: after project operation, the high-efficiency smelting target of 'coal lifting, coke reducing, iron increasing and steel protecting' of the blast furnace is realized, the oxygen enrichment rate is improved by 0.85 percent, and the molten iron yield is increased by more than 670 tons per day.
(2) Annual benefits (benefit calculation divided into scrap replacement and coke ratio reduction):
a. molten iron replaces scrap steel: the average value of the price difference of molten iron below scrap steel is 80 yuan/ton, and the calculation is carried out:
The method has the following advantages: 670 tons x 320 days x 80 yuan/ton = 1715.2 ten thousand yuan;
Remarks: the oxygen enrichment smelting time of each year is calculated according to 320 days (the overhauling time of the air separation unit and the overhauling time of the blast furnace are removed)
B. The cost of the coke ratio is reduced: according to the empirical value, when the oxygen enrichment is increased by 1%, the coke ratio is reduced by 0.5%, the coke ratio of two 1800m 3 blast furnaces is 364kg/t, and the average daily output is calculated according to 5200 tons:
Saving coke: 1.755% ≡1% ×0.5% ×5200×364kg/t ≡1000×320 days×2=10630 tons, the primary coke price is calculated as 2200 yuan/ton:
the production benefits are as follows: 10630 tons x 2200 yuan/ton = 2338.6 ten thousand yuan;
c. Annual oxygen purchase cost: oxygen cost: 0.29 yuan/m 3 x 10000m3/h x 24h x 320 days = 2227.2 ten thousand yuan;
Annual production benefits: (benefit 1) + (benefit 2) - (annual oxygen purchase cost) = 1715.2 ten thousand yuan+ 2338.6 ten thousand yuan-2227.2 ten thousand yuan= 1826.6 ten thousand yuan.
(3) Social benefit: the blast furnace oxygen-enriched blast mode comprises after-machine oxygen enrichment and before-machine oxygen enrichment, and the after-machine oxygen enrichment is a mode which is adopted by many iron and steel enterprises. A large amount of compressed oxygen must be consumed in the oxygen enrichment process after the machine, which causes a large amount of electric energy consumption. In order to relieve the dual pressure of cost and environmental protection, the after-machine oxygen-enriched mode is gradually eliminated, and the more energy-saving before-machine oxygen-enriched technology is gradually popularized and applied in more and more iron and steel enterprises.
The utility model adds an air-oxygen mixer between the blower and the air filter, communicates the air-separating unit with the air-oxygen mixer, and conveys normal pressure oxygen to the air-oxygen mixer, and conveys the mixed gas to the blower for blast furnace oxygen enrichment. The utility model adopts normal pressure oxygen to mix oxygen and air in the oxygen-enriched mixer (2L 2022 2 1821023.5) in front of the blast furnace machine for iron and steel treatment from the suction side of the blast furnace blower, and adopts stainless steel with good flame-proof and fire-retarding properties for improving the system safety, and the pipeline is provided with a filter and a flame retardant device, and a pneumatic quick-cutting valve cuts off the supply of oxygen and fills nitrogen in emergency, thereby improving the safety of the system.
The utility model sets three blowers, wherein the third blower is a standby blower, the blowers adopt a two-to-one operation mode, and two of the blowers are selected to work normally by controlling valves on pipelines communicated with the blowers. The safety nitrogen pipeline is respectively communicated with the first oxygen pipeline and the second oxygen pipeline, and the oxygen content in the first oxygen pipeline and/or the second oxygen pipeline exceeds the standard, namely, the oxygen content can be reduced by closing the oxygen input of the first oxygen pipeline and/or the second oxygen pipeline and then introducing nitrogen into the first oxygen pipeline and/or the second oxygen pipeline, so that the safety of operators and equipment and facilities can be protected. The utility model has the advantages of relatively simple structure, good gas mixing effect, convenient operation, energy conservation and cost reduction, can improve the smelting strength of the blast furnace after being used, is favorable for the smooth running of the blast furnace condition, has considerable economic benefit and can also achieve the aims of energy conservation and emission reduction.
Claims (4)
1. A long-distance pre-blast furnace smelting machine oxygen enrichment system, which is characterized by comprising a first air filter (101), a second air filter (102) and a third air filter (103), wherein the first air filter (101) is communicated with a first blower (141) through a first air-oxygen mixer (111), the second air filter (102) is communicated with a second blower (142) through a second air-oxygen mixer (112), and the third air filter (103) is communicated with a third blower (143) through a third air-oxygen mixer (113);
Wherein, the first air oxygen mixer (111) is communicated to an air separation unit (1) through a first oxygen pipeline (201), the second air oxygen mixer (112) is communicated to the same air separation unit (1) through a second oxygen pipeline (202), the third air oxygen mixer (113) is communicated to the first oxygen pipeline (201) through a third oxygen pipeline (203), and the third air oxygen mixer (113) is communicated to the second oxygen pipeline (202) through a fourth oxygen pipeline (204);
The air separation unit (1) is used for providing normal pressure oxygen for the first air-oxygen mixer (111), the second air-oxygen mixer (112) and the third air-oxygen mixer (113); the first air-oxygen mixer (111), the second air-oxygen mixer (112) and the third air-oxygen mixer (113) are respectively used for adding normal-pressure oxygen into air output by the first air filter (101), the second air filter (102) and the third air filter (103), and finally, the air is conveyed to the first air blower (141), the second air blower (142) and the third air blower (143);
The device comprises a first oxygen pipeline (201), a second oxygen pipeline (202), a third oxygen pipeline (203) and a fourth oxygen pipeline (204), wherein manual cut-off valves are arranged on the first oxygen pipeline and the second oxygen pipeline, and each manual cut-off valve is used for controlling the on-off of the oxygen pipeline through the on-off of the manual cut-off valve.
2. The oxygen enrichment system before long-distance blast furnace smelting machine according to claim 1, wherein the air separation unit (1) is respectively communicated with the first oxygen pipeline (201) and the second oxygen pipeline (202) through a main pipe cut-off valve (2); the first oxygen pipeline (201) and the second oxygen pipeline (202) are sequentially provided with a second branch pipe cut-off valve (3), a flowmeter (4), an oxygen filter (5), a start regulating valve (6), an oxygen pneumatic quick cut valve, a flame arrester (8) and an oxygen content analyzer (19) along the oxygen output direction.
3. The oxygen enrichment system before long-distance blast furnace smelting machine according to claim 1 or 2, further comprising a safety nitrogen pipeline, wherein the safety nitrogen pipeline comprises a nitrogen main pipeline (205), an output end of the nitrogen main pipeline (205) is divided into a first nitrogen branch (206) and a second nitrogen branch (207), the first nitrogen branch (206) is communicated with the second oxygen pipeline (202) through a first pneumatic quick-opening valve (181), and the second nitrogen branch (207) is communicated with the first oxygen pipeline (201) through a second pneumatic quick-opening valve (182).
4. A long-distance pre-blast furnace smelting machine oxygen enrichment system as claimed in claim 3, wherein the nitrogen main pipeline (205) is provided with a first stop valve (15), a nitrogen tank (16) and a second stop valve (17) in sequence along the air inlet direction.
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| CN116926256A (en) * | 2023-08-04 | 2023-10-24 | 陕西龙门钢铁有限责任公司 | Long-distance oxygen enrichment system in front of blast furnace smelting machine and control method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116926256A (en) * | 2023-08-04 | 2023-10-24 | 陕西龙门钢铁有限责任公司 | Long-distance oxygen enrichment system in front of blast furnace smelting machine and control method thereof |
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