CN113639200A - Pipeline system and method for merging high-pressure oxygen of chemical plant into medium-pressure oxygen pipe network of iron and steel plant - Google Patents
Pipeline system and method for merging high-pressure oxygen of chemical plant into medium-pressure oxygen pipe network of iron and steel plant Download PDFInfo
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- CN113639200A CN113639200A CN202110934174.5A CN202110934174A CN113639200A CN 113639200 A CN113639200 A CN 113639200A CN 202110934174 A CN202110934174 A CN 202110934174A CN 113639200 A CN113639200 A CN 113639200A
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- pressure
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- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims abstract description 132
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 132
- 239000001301 oxygen Substances 0.000 title claims abstract description 132
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 63
- 239000010959 steel Substances 0.000 title claims abstract description 63
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 60
- 239000000126 substance Substances 0.000 title claims abstract description 47
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 30
- 238000000034 method Methods 0.000 title claims description 18
- 238000000926 separation method Methods 0.000 claims abstract description 32
- 230000001105 regulatory effect Effects 0.000 claims description 54
- 230000001276 controlling effect Effects 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims 1
- 239000002994 raw material Substances 0.000 claims 1
- 238000003723 Smelting Methods 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 3
- 239000013589 supplement Substances 0.000 abstract description 3
- 239000008399 tap water Substances 0.000 abstract description 3
- 235000020679 tap water Nutrition 0.000 abstract description 3
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 3
- 238000002309 gasification Methods 0.000 description 3
- 229910000792 Monel Inorganic materials 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 229910000881 Cu alloy Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000012946 outsourcing Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000000844 transformation Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D1/00—Pipe-line systems
- F17D1/02—Pipe-line systems for gases or vapours
- F17D1/04—Pipe-line systems for gases or vapours for distribution of gas
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D35/00—Filtering devices having features not specifically covered by groups B01D24/00 - B01D33/00, or for applications not specifically covered by groups B01D24/00 - B01D33/00; Auxiliary devices for filtration; Filter housing constructions
- B01D35/02—Filters adapted for location in special places, e.g. pipe-lines, pumps, stop-cocks
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D3/00—Arrangements for supervising or controlling working operations
- F17D3/01—Arrangements for supervising or controlling working operations for controlling, signalling, or supervising the conveyance of a product
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D3/00—Arrangements for supervising or controlling working operations
- F17D3/18—Arrangements for supervising or controlling working operations for measuring the quantity of conveyed product
Abstract
The invention discloses a pipeline system for merging high-pressure oxygen in a chemical plant into a medium-pressure oxygen pipe network in a steel plant, which relates to the technical field of oxygen generation equipment and comprises a chemical plant air separation device; the air inlet end of the oxygen conveying pipeline is communicated with the air separation device of the chemical plant, and a stop valve, a pipeline pressure gauge, a flow meter and an adjusting valve are sequentially arranged on the oxygen conveying pipeline from the air inlet end to the air outlet end; and the air outlet end of the oxygen conveying pipeline is communicated with the inlet end of the oxygen pipe network of the iron and steel plant. The invention introduces the surplus high-pressure oxygen in the chemical plant as the supplement of the medium-pressure oxygen in the steel plant, effectively relieves the problem of difficult oxygen demand for steel smelting, and simultaneously can use the oxygen in the chemical plant in a tap water mode to achieve the effects of being taken at any time and being used quickly.
Description
Technical Field
The invention relates to the technical field of oxygen generation equipment, in particular to a pipeline system and a method for merging high-pressure oxygen in a chemical plant into a medium-pressure oxygen pipe network in an iron and steel plant.
Background
Along with the rapid implementation of the large oxygen-rich fuel ratio reducing technology of the iron-making blast furnace, the existing oxygen production equipment of the iron and steel plant is completely opened and can not meet the oxygen demand, a large amount of liquid oxygen needs to be purchased to return to a charging storage tank for gasification and oxygen conservation, so that the normal production oxygen demand of the iron and steel plant can be met, the oxygen conservation cost is greatly increased, and the liquid oxygen return charging and gasification operation has great risk. The chemical plants generally have oxygen surplus, which causes waste of oxygen.
Disclosure of Invention
The invention aims to solve the technical problem of overcoming the defects of the prior art and provides a pipeline system and a method for merging high-pressure oxygen of a chemical plant into a medium-pressure oxygen pipe network of a steel plant.
In order to solve the technical problems, the technical scheme of the invention is as follows:
a pipeline system for merging high-pressure oxygen in a chemical plant into a medium-pressure oxygen pipe network in an iron and steel plant comprises,
an air separation unit of a chemical plant;
the air inlet end of the oxygen conveying pipeline is communicated with the air separation device of the chemical plant, and a stop valve, a pipeline pressure gauge, a flow meter and an adjusting valve are sequentially arranged on the oxygen conveying pipeline from the air inlet end to the air outlet end; and the number of the first and second groups,
and the air outlet end of the oxygen conveying pipeline is communicated with the inlet end of the oxygen pipe network of the iron and steel plant.
As a preferred scheme of the pipeline system for merging the high-pressure oxygen of the chemical plant into the medium-pressure oxygen pipe network of the steel plant, the method comprises the following steps: the chemical plant air separation unit comprises a first air separation unit and a second air separation unit, and the pressure of oxygen separated by the first air separation unit is smaller than that of oxygen separated by the second air separation unit.
As a preferred scheme of the pipeline system for merging the high-pressure oxygen of the chemical plant into the medium-pressure oxygen pipe network of the steel plant, the method comprises the following steps: oxygen conveying line includes first conveying line and second conveying line, first conveying line's inlet end with first air separation plant intercommunication, second conveying line's inlet end with second air separation plant intercommunication, first conveying line with second conveying line's the end of giving vent to anger all with the entry end intercommunication of steel plant oxygen pipe network.
As a preferred scheme of the pipeline system for merging the high-pressure oxygen of the chemical plant into the medium-pressure oxygen pipe network of the steel plant, the method comprises the following steps: a first stop valve, a second stop valve, a third stop valve, a first pipeline pressure gauge, a first flowmeter, a first regulating valve, a fourth stop valve, a second pipeline pressure gauge and a fifth stop valve are sequentially arranged on the first conveying pipeline from the air inlet end to the air outlet end, and two ends of the first stop valve are connected in parallel with a first pressure equalizing valve;
and a sixth stop valve, a seventh stop valve, an eighth stop valve, a third pipeline pressure gauge, a second flowmeter, a second regulating valve, a ninth stop valve, a fourth pipeline pressure gauge and a tenth stop valve are sequentially arranged on the second conveying pipeline from the air inlet end to the air outlet end, and second pressure equalizing valves are connected in parallel at two ends of the sixth stop valve.
As a preferred scheme of the pipeline system for merging the high-pressure oxygen of the chemical plant into the medium-pressure oxygen pipe network of the steel plant, the method comprises the following steps: a first filter is arranged on the first conveying pipeline between the third stop valve and the first pipeline pressure gauge;
and a second filter is arranged on the second conveying pipeline between the seventh stop valve and the third pipeline pressure gauge.
As a preferred scheme of the pipeline system for merging the high-pressure oxygen of the chemical plant into the medium-pressure oxygen pipe network of the steel plant, the method comprises the following steps: the first regulating valve and the second regulating valve are both solenoid valves.
As a preferred scheme of the pipeline system for merging the high-pressure oxygen of the chemical plant into the medium-pressure oxygen pipe network of the steel plant, the method comprises the following steps: the first regulator valve interlocks with the second regulator valve.
The invention also discloses a method for merging the high-pressure oxygen of the chemical plant into the medium-pressure oxygen pipe network of the steel plant, which comprises the following steps:
s1: opening all stop valves on the oxygen conveying pipeline, and controlling the first regulating valve and the second regulating valve to be opened;
s2: and controlling the valve openness of the first regulating valve and the second regulating valve according to the numerical values of the first flowmeter, the second pipeline pressure gauge and the fourth pipeline pressure gauge, and supplying oxygen in a constant-flow oxygen supply mode.
As a preferable scheme of the method for merging the high-pressure oxygen of the chemical plant into the medium-pressure oxygen pipe network of the steel plant, the method comprises the following steps: also comprises the following steps of (1) preparing,
when the pipeline pressure measured by the second pipeline pressure gauge and the fourth pipeline pressure gauge exceeds the set pipe network pressure of the iron and steel plant, the first regulating valve and the second regulating valve are controlled to be switched into pressure control, and the valve opening degrees of the first regulating valve and the second regulating valve are controlled, so that the pipeline pressure is less than or equal to the set pipe network pressure of the iron and steel plant.
The invention has the beneficial effects that:
(1) the invention introduces the surplus high-pressure oxygen in the chemical plant as the supplement of the medium-pressure oxygen in the iron and steel plant, effectively relieves the problem of difficult oxygen demand for steel smelting, reduces the safety risks of outsourcing liquid oxygen recharging, gasification and the like, realizes energy conservation and emission reduction, optimizes the resource utilization and brings huge economic benefits.
(2) According to the oxygen with different pressures separated by the air separation device in the chemical plant, two conveying pipelines are established to supply oxygen to the iron and steel plant together, the oxygen gap for iron and steel smelting is filled by effectively utilizing the oxygen left in the chemical plant, and the oxygen requirement of the iron and steel plant is ensured.
(3) The invention enables the steel plant to use the oxygen of the chemical plant in a 'tap water' mode through the conveying pipeline, thereby achieving the effects of being taken at any time and being used quickly.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is a schematic structural diagram of a system for merging high-pressure oxygen of a chemical plant into a medium-pressure oxygen pipe network of a steel plant provided by the invention.
Detailed Description
In order that the present invention may be more readily and clearly understood, a more particular description of the invention briefly described above will be rendered by reference to specific embodiments that are illustrated in the appended drawings.
The embodiment provides a pipeline system for merging high-pressure oxygen in a chemical plant into a medium-pressure oxygen pipe network in an iron and steel plant, which comprises a chemical plant air separation device, an oxygen conveying pipeline and the oxygen pipe network in the iron and steel plant. The air separation device in the chemical plant conveys the surplus oxygen in the chemical plant to an oxygen pipe network of an iron and steel plant through an oxygen conveying pipeline for iron and steel smelting in the iron and steel plant.
Specifically, the air separation plant of the chemical plant comprises a first air separation plant and a second air separation plant. The purity of the oxygen separated by the first air separation device is more than or equal to 99.5 percent, the pressure is 7MPa, and the purity of the oxygen separated by the second air separation device is more than or equal to 99.5 percent, and the pressure is 10 MPa. The normal operating pressure of the oxygen pipe network of the steel plant is generally less than or equal to 2.2 MPa, and the pressure alarm value is generally set to be 2.5 MPa.
The oxygen conveying pipeline comprises a first conveying pipeline and a second conveying pipeline. The air inlet end of the first conveying pipeline is communicated with the first air separation device, and the air outlet end of the first conveying pipeline is communicated with the air inlet end of the oxygen pipe network of the iron and steel plant. The first conveying pipeline is sequentially provided with a first stop valve J1, a second stop valve J2, a third stop valve J3, a first pipeline pressure gauge P1, a first flowmeter S1, a first regulating valve F1, a fourth stop valve J4, a second pipeline pressure gauge P2 and a fifth stop valve J5 from an air inlet end to an air outlet end, and two ends of the first stop valve J1 are connected with a first pressure equalizing valve B1 in parallel. And the air inlet end of the second conveying pipeline is communicated with a second air separation device, and the air outlet end of the second conveying pipeline is communicated with the air inlet end of an oxygen pipe network of the steel plant. And a sixth stop valve J6, a seventh stop valve J7, an eighth stop valve J8, a third pipeline pressure gauge P3, a second flow meter S2, a second regulating valve F2, a ninth stop valve J9, a fourth pipeline pressure gauge P4 and a tenth stop valve J1 are sequentially arranged on the second conveying pipeline from the air inlet end to the air outlet end, and second pressure equalizing valves B2 are connected in parallel at two ends of the sixth stop valve J6.
The stop valve can temporarily disconnect part of pipelines, and is convenient for maintaining and repairing the pipelines and the like. The pipeline pressure gauge can monitor the pressure of the pipeline in real time, and the flowmeter can monitor the flow of the pipeline in real time. The regulating valve regulates the flow and pressure of the pipeline by regulating the opening of the valve.
It should be noted that the first regulating valve and the second regulating valve are both solenoid valves, and the first regulating valve and the second regulating valve are interlocked, and the interlock set value is 2.6MPa, that is, when the pipeline pressure reaches 2.6MPa, the first regulating valve and the second regulating valve are de-energized, so that the first regulating valve and the second regulating valve are both closed.
The high-pressure oxygen that first air separation plant separated is through first conveyer pipe way to the oxygen pipe network oxygen suppliment of iron and steel plant, and the high-pressure oxygen that second air separation plant separated is through second conveyer pipe way to the oxygen pipe network oxygen suppliment of iron and steel plant. First conveying line and second conveying line are when the oxygen suppliment, and the numerical value that records through flowmeter and pipeline manometer controls the valve aperture of governing valve to satisfy the demand pressure and the flow of iron and steel plant.
Preferably, a first filter is arranged between the third stop valve and the first pipeline pressure gauge on the first conveying pipeline, and a second filter is arranged between the seventh stop valve and the third pipeline pressure gauge on the second conveying pipeline. The two filters can filter impurity particles and the like in the first conveying pipeline and the second conveying pipeline, and the impurity particles are prevented from entering an oxygen pipe network of an iron and steel plant along with the pipelines.
In addition, the air outlet ends of the first conveying pipeline and the second conveying pipeline are communicated and then communicated with the air inlet end of the oxygen pipe network of the steel plant. The pipeline after the air outlet ends of the first conveying pipeline and the second conveying pipeline are combined is provided with a mass flow meter, and the pipeline at the front end of the oxygen pipeline network of the steel plant is sequentially provided with a vortex flow meter, a check valve and an eleventh stop valve. The reading of the vortex shedding flowmeter is compared with the reading of the mass flowmeter to judge whether the conveying pipeline has the problems of leakage and the like.
In view of the safety risk that the front end may have working pressure exceeding the allowable working pressure of carbon steel, the main pipeline adopts 06Cr19Ni10 seamless steel pipe; monel is adopted at the front and back 1.5m of the first pressure regulating valve bank and the second pressure regulating valve bank; and the emptying pipeline is made of monel and copper alloy.
The embodiment also provides a method for merging high-pressure oxygen in a chemical plant into a medium-pressure oxygen pipe network in an iron and steel plant, which comprises the following steps:
s1: opening all stop valves on the first oxygen conveying pipeline and the second oxygen conveying pipeline;
s2: the valve opening of the first regulating valve is remotely controlled according to the numerical values of the first flowmeter and the second pipeline pressure gauge, and the valve opening of the second regulating valve is remotely controlled according to the numerical values of the second flowmeter and the fourth pipeline pressure gauge so as to meet the required pressure and flow of the steel plant;
s3: during the period that the first conveying pipeline and the second conveying pipeline supply oxygen to the oxygen pipe network of the steel plant, the first regulating valve and the second regulating valve are placed through automatic flow control, and the oxygen supply amount is controlled to keep a certain value;
s4: when the pressure of the pipe network behind the first regulating valve and the second regulating valve rises to exceed a set value of 2.5MPa, the controller switches the first regulating valve and the second regulating valve into pressure control, and the opening degree of the first regulating valve and the second regulating valve is reduced so as to reduce the oxygen conveying capacity and ensure that the pressure behind the first regulating valve and the second regulating valve does not exceed an index; when the pipeline pressure behind the first regulating valve and the second regulating valve is reduced to be 2.4MPa of a set value, the controller controls the first regulating valve and the second regulating valve to be switched to flow control, and the normal operation mode is recovered.
By the pipeline system and the control method, the surplus high-pressure oxygen in the chemical plant can be introduced to supplement the medium-pressure oxygen in the iron and steel plant, the problem of difficulty in oxygen demand for iron and steel smelting is effectively solved, and meanwhile, the oxygen in the chemical plant can be used in a tap water mode, so that the effects of being taken at any time and being used quickly are achieved.
In addition to the above embodiments, the present invention may have other embodiments; all technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope of the claims of the present invention.
Claims (9)
1. The utility model provides a chemical plant high pressure oxygen merges pipe-line system of steel plant middling pressure oxygen pipe network which characterized in that: comprises the steps of (a) preparing a mixture of a plurality of raw materials,
an air separation unit of a chemical plant;
the air inlet end of the oxygen conveying pipeline is communicated with the air separation device of the chemical plant, and a stop valve, a pipeline pressure gauge, a flow meter and an adjusting valve are sequentially arranged on the oxygen conveying pipeline from the air inlet end to the air outlet end; and the number of the first and second groups,
and the air outlet end of the oxygen conveying pipeline is communicated with the inlet end of the oxygen pipe network of the iron and steel plant.
2. The pipeline system for merging high-pressure oxygen of a chemical plant into a medium-pressure oxygen pipe network of a steel plant according to claim 1, characterized in that: the chemical plant air separation unit comprises a first air separation unit and a second air separation unit, and the pressure of oxygen separated by the first air separation unit is smaller than that of oxygen separated by the second air separation unit.
3. The pipeline system for merging high-pressure oxygen of a chemical plant into a medium-pressure oxygen pipe network of a steel plant according to claim 2, characterized in that: oxygen conveying line includes first conveying line and second conveying line, first conveying line's inlet end with first air separation plant intercommunication, second conveying line's inlet end with second air separation plant intercommunication, first conveying line with second conveying line's the end of giving vent to anger all with the entry end intercommunication of steel plant oxygen pipe network.
4. The pipeline system for merging high-pressure oxygen of a chemical plant into a medium-pressure oxygen pipe network of a steel plant according to claim 1, characterized in that: a first stop valve, a second stop valve, a third stop valve, a first pipeline pressure gauge, a first flowmeter, a first regulating valve, a fourth stop valve, a second pipeline pressure gauge and a fifth stop valve are sequentially arranged on the first conveying pipeline from the air inlet end to the air outlet end, and two ends of the first stop valve are connected in parallel with a first pressure equalizing valve;
and a sixth stop valve, a seventh stop valve, an eighth stop valve, a third pipeline pressure gauge, a second flowmeter, a second regulating valve, a ninth stop valve, a fourth pipeline pressure gauge and a tenth stop valve are sequentially arranged on the second conveying pipeline from the air inlet end to the air outlet end, and second pressure equalizing valves are connected in parallel at two ends of the sixth stop valve.
5. The pipeline system for merging high-pressure oxygen of a chemical plant into a medium-pressure oxygen pipe network of a steel plant according to claim 4, characterized in that: a first filter is arranged on the first conveying pipeline between the third stop valve and the first pipeline pressure gauge;
and a second filter is arranged on the second conveying pipeline between the seventh stop valve and the third pipeline pressure gauge.
6. The pipeline system for merging high-pressure oxygen of a chemical plant into a medium-pressure oxygen pipe network of a steel plant according to claim 4, characterized in that: the first regulating valve and the second regulating valve are both solenoid valves.
7. The pipeline system for merging high-pressure oxygen of a chemical plant into a medium-pressure oxygen pipe network of a steel plant according to claim 6, characterized in that: the first regulator valve interlocks with the second regulator valve.
8. A method for incorporating high-pressure oxygen of a chemical plant into a medium-pressure oxygen pipe network of a steel plant is characterized by comprising the following steps: the method comprises the following steps:
s1: opening all stop valves on the oxygen conveying pipeline, and controlling the first regulating valve and the second regulating valve to be opened;
s2: and controlling the valve openness of the first regulating valve and the second regulating valve according to the numerical values of the first flowmeter, the second pipeline pressure gauge and the fourth pipeline pressure gauge, and supplying oxygen in a constant-flow oxygen supply mode.
9. The method of incorporating high pressure oxygen from chemical plant into medium pressure oxygen piping network of steel plant as claimed in claim 8, wherein: also comprises the following steps of (1) preparing,
when the pipeline pressure measured by the second pipeline pressure gauge and the fourth pipeline pressure gauge exceeds the set pipe network pressure of the iron and steel plant, the first regulating valve and the second regulating valve are controlled to be switched into pressure control, and the valve opening degrees of the first regulating valve and the second regulating valve are controlled, so that the pipeline pressure is less than or equal to the set pipe network pressure of the iron and steel plant.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110934174.5A CN113639200A (en) | 2021-08-16 | 2021-08-16 | Pipeline system and method for merging high-pressure oxygen of chemical plant into medium-pressure oxygen pipe network of iron and steel plant |
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| CN202110934174.5A CN113639200A (en) | 2021-08-16 | 2021-08-16 | Pipeline system and method for merging high-pressure oxygen of chemical plant into medium-pressure oxygen pipe network of iron and steel plant |
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| CN111271602A (en) * | 2020-02-28 | 2020-06-12 | 宁夏建龙龙祥钢铁有限公司 | Method for realizing complementation of communication gas quantity of low-pressure pipe network and medium-pressure pipe network |
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