Device for smelting stainless steel by blowing carbon dioxide in GOR converter

Abstract

The invention belongs to the technical field of steel smelting equipment, and particularly relates to a device for smelting stainless steel by blowing carbon dioxide through a GOR converter. Comprising a first compressor, and the first compressor is sequentially connected with a first membrane separator, a transfer tank, a first catalytic burner, a second catalytic burner, a third catalytic burner, a first heat exchange mechanism, a second compressor, a second membrane separator and a nitrogen tank through a main pipeline. Gas seepage ends of the first membrane separator and the second membrane separator are connected in parallel and then are sequentially connected with a third compressor, a third membrane separator and a gas storage tank through gas pipelines. According to the invention, nitrogen oxides, sulfur oxides and carbon monoxide in the metallurgical flue gas are converted into carbon dioxide, nitrogen and sulfur, and the metallurgical waste flue gas is comprehensively recovered, so that the emission of harmful gas is reduced, and the goal of green emission reduction is achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of steel smelting equipment, and in particular relates to a device for smelting stainless steel by injecting carbon dioxide into a GOR converter. Background Art

[0002] With the implementation of the national low-carbon environmental protection policy, the modern metallurgical industry wants to further reduce carbon dioxide emissions and achieve green emissions and low-carbon emissions. How to actively and fully utilize carbon dioxide has received more and more attention. Carbon dioxide (CO2) is a weak oxidizing gas. The heat absorption of carbon dioxide and carbon reaction can play the role of temperature control, stirring, covering protection and dilution. It can not only reduce carbon dioxide emissions, but also reduce production costs and improve the quality of molten steel. Therefore, it can be used in GOR converter steelmaking by bottom blowing or top blowing. At present, the technology of recycling carbon dioxide from metallurgical waste gas for steel smelting is limited to the recovery and purification of carbon dioxide, and no further research has been conducted on the comprehensive utilization of metallurgical waste gas. Metallurgical waste gas is produced from sintering, blast furnace, converter, gas boiler and other processes, which contains a large amount of dust, carbon dioxide, carbon monoxide, nitrogen oxides, sulfur oxides, etc. The simple recovery of carbon dioxide is only one of the links. The comprehensive utilization of metallurgical waste gas can maximize the realization of green emissions. Summary of the invention

[0003] The object of the present invention is to provide a device for smelting stainless steel by injecting carbon dioxide into a GOR converter, so as to solve the problems existing in the prior art.

[0004] The technical solution adopted by the present invention to solve its technical problem is:

[0005] A device for smelting stainless steel by injecting carbon dioxide into a GOR converter comprises a first compressor, wherein the first compressor is sequentially connected to a first membrane separator, a transfer tank, a first catalytic burner, a second catalytic burner, a third catalytic burner, a first heat exchange mechanism, a second compressor, a second membrane separator, and a nitrogen tank through a main pipeline, and gas seepage ends of the first membrane separator and the second membrane separator are connected in parallel and sequentially connected to a third compressor, a third membrane separator, and a gas storage tank through a gas pipeline.

[0006] Furthermore, one end of the gas pipeline close to the first membrane separator and the second membrane separator is connected to a liquid pipeline, and the liquid pipeline is sequentially connected to a fourth compressor, a second heat exchange mechanism, a cyclone separator, a coalescing separator, and a liquid storage tank.

[0007] Furthermore, the gas phase outlet of the cyclone separator is connected to the inlet of the coalescing separator, and the liquid phase outlet of the cyclone separator is connected to the liquid storage tank.

[0008] Furthermore, the gas phase outlet of the coalescing separator and the intercepted gas outlet of the third membrane separator are connected to the cold medium inlet of the first heat exchange mechanism through a reflux pipeline, and the cold medium outlet of the first heat exchange mechanism is connected to the inlet of the transfer tank through a reflux pipeline.

[0009] Furthermore, the first heat exchange mechanism is composed of at least two heat exchangers connected in series, and the return pipeline is connected to the heat exchanger close to the third catalytic burner.

[0010] Furthermore, a venting pipeline is connected to the reflux pipeline at the transfer tank inlet, and the venting pipeline is connected to a venting tower.

[0011] Furthermore, the catalyst in the first catalytic burner is a metal oxide, and the metal oxide contains copper oxide and one or more oxides doped with cerium, cobalt, manganese, and chromium.

[0012] Furthermore, the catalyst in the second catalytic burner is bauxite.

[0013] Furthermore, the catalyst in the third catalytic burner is an oxidation catalyst.

[0014] The present invention has the following beneficial effects:

[0015] 1. The present invention converts nitrogen oxides, sulfur oxides and carbon monoxide in metallurgical flue gas into carbon dioxide, nitrogen and sulfur, and comprehensively recovers metallurgical waste flue gas, thereby reducing the emission of harmful gases and achieving the goal of green emission reduction.

[0016] 2. Through multiple catalytic burners and different catalysts, nitrogen oxides, sulfur oxides and carbon monoxide are further reacted to generate recyclable carbon dioxide, nitrogen and sulfur, thereby improving the comprehensive utilization of metallurgical waste gas.

[0017] 3. The carbon dioxide in the flue gas is separated by the first membrane separator, thereby increasing the concentration of carbon monoxide and nitrogen monoxide in the flue gas in disguised form, which is beneficial to the reaction.

[0018] 4. Producing liquid and gaseous carbon dioxide at the same time can not only meet the requirements of long-distance carbon dioxide users for easy transportation, but also meet the requirements of nearby carbon dioxide users for nearby use. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of the present invention.

[0020] Among them: 1. the first compressor; 2. the main pipeline; 3. the first membrane separator; 4. the transfer tank; 5. the first catalytic burner; 6. the second catalytic burner; 7. the third catalytic burner; 8. the first heat exchange mechanism; 9. the second compressor; 10. the second membrane separator; 11. the nitrogen tank; 12. the gas pipeline; 13. the third compressor; 14. the third membrane separator; 15. the gas storage tank; 16. the liquid pipeline; 17. the fourth compressor; 18. the second heat exchange mechanism; 19. the cyclone separator; 20. the coalescing separator; 21. the liquid storage tank; 22. the reflux pipeline; 23. the vent pipeline; 24. the vent tower. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments and drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0022] like Figure 1 As shown, a device for injecting carbon dioxide into a GOR converter to smelt stainless steel comprises a first compressor 1, the first compressor 1 is sequentially connected to a first membrane separator 3, a transfer tank 4, a first catalytic burner 5, a second catalytic burner 6, a third catalytic burner 7, a first heat exchange mechanism 8, a second compressor 9, a second membrane separator 10, and a nitrogen tank 11 through a main pipeline 2, and the gas permeation ends of the first membrane separator 3 and the second membrane separator 10 are connected in parallel and sequentially connected to a third compressor 13, a third membrane separator 14, and a gas storage tank 15 through a gas pipeline 12. The first membrane separator 3, the second membrane separator 10, and the third membrane separator 14 are all membrane separation devices, which use the special polarity of carbon dioxide for permeation separation, and usually include equipment such as a buffer tank, which is a prior art, and the specific structure and connection method are not repeated again. A catalytic combustion device refers to a device or equipment that burns under the action of a catalyst, which is a prior art, and the specific structure is not repeated again.

[0023] One end of the gas pipeline 12 close to the first membrane separator 3 and the second membrane separator 10 is connected to a liquid pipeline 16, and the liquid pipeline 16 is sequentially connected to a fourth compressor 17, a second heat exchange mechanism 18, a cyclone separator 19, a coalescing separator 20, and a liquid storage tank 21.

[0024] The gas phase outlet of the cyclone separator 19 is connected to the inlet of the coalescing separator 20 , and the liquid phase outlet of the cyclone separator 19 is connected to the liquid storage tank 21 .

[0025] The gas phase outlet of the coalescing separator 20 and the intercepted gas outlet of the third membrane separator 14 are connected to the cold medium inlet of the first heat exchange mechanism 8 through the reflux pipeline 22 , and the cold medium outlet of the first heat exchange mechanism 8 is connected to the inlet of the transfer tank 4 through the reflux pipeline 22 .

[0026] The first heat exchange mechanism 8 is composed of at least two heat exchangers connected in series, and the return pipeline 22 is connected to the heat exchanger close to the third catalytic burner 7 .

[0027] The reflux pipeline 22 at the inlet of the transfer tank 4 is connected to a venting pipeline 23 , and the venting pipeline 23 is connected to a venting tower 24 .

[0028] The catalyst in the first catalytic burner 5 is a metal oxide, and the metal oxide contains copper oxide and one or more oxides doped with cerium, cobalt, manganese, and chromium.

[0029] The catalyst in the second catalytic burner 6 is bauxite.

[0030] The catalyst in the third catalytic burner 7 is an oxidation catalyst.

[0031] The working principle of the present invention is:

[0032] After the dust removal, the flue gas enters the first compressor 1 and is compressed to a specified pressure. The high-pressure flue gas enters the supporting buffer tank of the first membrane separator 3. After the pressure and flow are stabilized, carbon dioxide is separated by the first membrane separator 3. Carbon dioxide enters the gas pipeline 12 as permeate gas. The trapped flue gas enters the first catalytic burner 5 through the transfer tank 4. At a suitable temperature and under the catalysis of the catalyst, carbon monoxide and nitrogen oxides (nitric oxide and nitrogen dioxide) react to generate carbon dioxide and nitrogen. Since carbon dioxide is separated in the first membrane separator 3, the concentration of carbon monoxide and nitrogen monoxide in the flue gas is increased in disguise, which is conducive to the reaction. Since the content of carbon monoxide is much greater than that of nitrogen oxides, there is still a large amount of carbon monoxide in the flue gas. Subsequently, the flue gas enters the second catalytic burner 6. At a suitable temperature and under the catalysis of the catalyst, carbon monoxide and sulfur oxides (sulfur dioxide, etc.) react to generate carbon dioxide and sulfur. In the third catalytic burner 7, oxygen is introduced therein, and carbon monoxide and oxygen react to generate carbon dioxide under the catalysis of a suitable temperature and a catalyst. At this time, most of the flue gas is carbon dioxide and nitrogen, and a small part is other gases. After heat exchange by the first heat exchange mechanism 8, the flue gas is cooled to a suitable temperature, compressed again by the second compressor 9, and separated by the second membrane separator 10. The carbon dioxide therein is separated and seeped into the gas pipeline, while the nitrogen and some impurity gases enter the nitrogen tank 11. The nitrogen in the nitrogen tank 11 can be further purified for use.

[0033] In this way, the carbon dioxide separated by the first membrane separator 3 and the second membrane separator 10 are combined and enter the third compressor 13 or the fourth compressor 17, and are distributed according to the actual situation. If the carbon dioxide user is close, it will choose to enter the third compressor 13, and after compression, it will be further purified and separated by the third membrane separator 14 to produce high-purity carbon dioxide gas, which will be stored in the gas tank. The separated residual flue gas will be cooled by the first heat exchange mechanism 8 as a refrigerant and then enter the transfer tank 4, thus forming a cycle;

[0034] If the carbon dioxide user is far away, it will choose to enter the fourth compressor 17. After compression and cooling, the carbon dioxide in the flue gas becomes liquid, and the flue gas also becomes a gas-liquid mixture. The gas and liquid are separated by the cyclone separator 19, and the high-purity liquid carbon dioxide enters the liquid tank. The residual gas phase flue gas passes through the first heat exchange mechanism 8 as a refrigerant to cool the flue gas therein and then enters the transfer tank 4, thus forming a cycle.

[0035] Carbon dioxide users can be distributed as appropriate, whether they are far away or near. Liquid carbon dioxide is easy to transport and can be used for long-distance transmission, while gaseous carbon dioxide can be used nearby.

[0036] The above-described embodiments are merely descriptions of preferred implementations of the present invention, and are not intended to limit the concept and scope of the present invention. Without departing from the design concept of the present invention, various modifications and improvements made by ordinary persons in the art to the technical solution of the present invention should all fall within the scope of protection of the present invention.

[0037] The techniques, shapes, and structural parts not described in detail in the present invention are all well-known techniques.

Claims

1. A device for injecting carbon dioxide into a GOR converter to smelt stainless steel, characterized in that: The invention comprises a first compressor, which is sequentially connected to a first membrane separator, a transfer tank, a first catalytic burner, a second catalytic burner, a third catalytic burner, a first heat exchange mechanism, a second compressor, a second membrane separator and a nitrogen tank through a main pipeline; the gas seepage ends of the first membrane separator and the second membrane separator are connected in parallel and sequentially connected to a third compressor, a third membrane separator and a gas storage tank through a gas pipeline.

2. The device for smelting stainless steel by injecting carbon dioxide into a GOR converter according to claim 1, characterized in that: One end of the gas pipeline close to the first membrane separator and the second membrane separator is connected to a liquid pipeline, and the liquid pipeline is sequentially connected to a fourth compressor, a second heat exchange mechanism, a cyclone separator, a coalescing separator, and a liquid storage tank.

3. The device for smelting stainless steel by injecting carbon dioxide into a GOR converter according to claim 2, characterized in that: The gas phase outlet of the cyclone separator is connected to the inlet of the coalescing separator, and the liquid phase outlet of the cyclone separator is connected to the liquid storage tank.

4. The device for smelting stainless steel by injecting carbon dioxide into a GOR converter according to claim 3, characterized in that: The gas phase outlet of the coalescence separator and the intercepted gas outlet of the third membrane separator are connected to the cold medium inlet of the first heat exchange mechanism through a reflux pipeline, and the cold medium outlet of the first heat exchange mechanism is connected to the inlet of the transfer tank through a reflux pipeline.

5. The device for smelting stainless steel by injecting carbon dioxide into a GOR converter according to claim 4, characterized in that: The first heat exchange mechanism is composed of at least two heat exchangers connected in series, and the return pipeline is connected to the heat exchanger close to the third catalytic burner.

6. The device for smelting stainless steel by injecting carbon dioxide into a GOR converter according to claim 4, characterized in that: The reflux pipeline at the transfer tank inlet is connected with a venting pipeline, and the venting pipeline is connected with a venting tower.

7. The device for smelting stainless steel by injecting carbon dioxide into a GOR converter according to claim 1, characterized in that: The catalyst in the first catalytic burner is a metal oxide, and the metal oxide contains copper oxide and one or more oxides doped with cerium, cobalt, manganese and chromium.

8. The device for smelting stainless steel by injecting carbon dioxide into a GOR converter according to claim 1, characterized in that: The catalyst in the second catalytic burner is bauxite.

9. The device for smelting stainless steel by injecting carbon dioxide into a GOR converter according to claim 1, characterized in that: The catalyst in the third catalytic burner is an oxidation catalyst.

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