Carbon dioxide top and bottom blowing system

Abstract

The carbon dioxide top and bottom blowing system comprises a liquid carbon dioxide storage tank, a heater, a buffer tank, a top blowing pipeline and a bottom blowing pipeline, a liquid carbon dioxide outlet end at the bottom of the carbon dioxide storage tank is connected to a feeding hole of the buffer tank through a pipeline; and the heater is arranged on a pipeline between the liquid carbon dioxide outlet end at the bottom of the carbon dioxide storage tank and the buffer tank. According to the system, carbon dioxide can react with carbon in molten steel, so that the carbon content is reduced, the consumption of oxygen is reduced, the production cost is reduced, and compared with argon, the carbon dioxide is generally cheaper, so that the production cost can be reduced by using the carbon dioxide; in addition, the carbon dioxide can react with sulfur in the molten steel to generate compounds such as calcium sulfide, so that the sulfur content in the steel is reduced, the quality of the steel is improved, and the nitrogen content in the molten steel can be reduced and the quality of the steel can be improved because the carbon dioxide does not contain nitrogen.

Description

Technical Field

[0001] The utility model relates to the technical field of converter top and bottom blowing, in particular to a carbon dioxide top and bottom blowing system. Background Art

[0002] The top blowing and bottom blowing gas sources used by existing steel mills are generally oxygen, nitrogen, and argon. Relatively speaking, the nitrogen content in molten steel is relatively high, there are more impurities, and the production cost is high. In addition, when oxygen is used as the top blowing and bottom blowing gas source, although it can reduce the impurities in the molten steel, the oxygen consumption is large, the production cost is high, and the impact on the environment is large. Therefore, the factory area has transformed the current top and bottom blowing systems to reduce the top and bottom blowing costs and improve production efficiency. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a carbon dioxide top and bottom blowing system which can reduce oxygen consumption, lower production cost and reduce impurities in molten steel.

[0004] The technical problem to be solved by the utility model is achieved through the following technical scheme: a carbon dioxide top and bottom blowing system, comprising a liquid carbon dioxide storage tank, a heater, a buffer tank, a top blowing pipeline and a bottom blowing pipeline;

[0005] The bottom liquid carbon dioxide outlet of the carbon dioxide storage tank is connected to the feed inlet of the buffer tank through a pipeline;

[0006] The heater is installed on the pipeline between the bottom liquid carbon dioxide outlet of the carbon dioxide storage tank and the buffer tank, valves I and II are arranged on the pipeline between the bottom liquid carbon dioxide outlet of the carbon dioxide storage tank and the heater, and valves III and IV are installed on the pipeline between the heater and the buffer tank;

[0007] The buffer tank is provided with a carbon dioxide outlet, and the inlet ends of the top blowing pipeline and the bottom blowing pipeline are connected in parallel to the carbon dioxide outlet of the buffer tank;

[0008] The outlet end of the top-blowing pipeline is connected in parallel with a plurality of top-blowing branch pipes with spray guns at the outlet ends, and the outlet end of the bottom-blowing pipeline is connected in parallel with a plurality of bottom-blowing branch pipes with spray guns at the outlet ends.

[0009] Preferably, the heater is a water bath heater.

[0010] Preferably, the valve I is a quick-cut valve.

[0011] Preferably, the valve IV is a check valve.

[0012] Preferably, the top blowing pipeline is provided with a stop valve, a filter I, a flow control valve, a pressure regulating valve, a flow control valve and a stop valve in sequence according to the airflow direction.

[0013] Preferably, a stop valve, a pressure regulating valve and a check valve are provided on the top blowing branch pipe in sequence according to the airflow direction.

[0014] Preferably, the bottom blowing pipeline is provided with valve V, filter II, pneumatic regulating valve group, pressure regulating valve, flow control valve, check valve and valve VI in sequence according to the airflow direction.

[0015] Compared with the prior art, the beneficial technical effects of the utility model are:

[0016] (1) Reduced oxygen consumption, because carbon dioxide can react with carbon in molten steel to reduce the carbon content, thereby reducing oxygen consumption;

[0017] (2) Reduced production costs. Compared with argon, carbon dioxide is usually cheaper, so the use of carbon dioxide can reduce production costs. In addition, carbon dioxide can react with sulfur in molten steel to produce compounds such as calcium sulfide, thereby reducing the sulfur content in steel and improving the quality of steel.

[0018] (3) Since carbon dioxide does not contain nitrogen, it can reduce the nitrogen content in molten steel and improve the quality of steel;

[0019] (4) Since carbon dioxide is a relatively environmentally friendly gas and its emission has little impact on the environment, the use of this system is more environmentally friendly;

[0020] (5) The carbon dioxide bottom blowing pipeline can speed up the chemical reaction rate in the steelmaking process, shorten the steelmaking time and improve production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is the system pipeline diagram of the utility model;

[0022] Figure 2 It is the pipeline diagram of the top blowing pipeline of the utility model;

[0023] Figure 3 It is the pipeline diagram of the bottom blowing pipeline of the utility model.

[0024] In the figure: 1. Carbon dioxide storage tank; 2. Heater; 3. Buffer tank; 4. Valve I; 5. Valve II; 6. Valve III; 7. Valve IV; 8. Carbon dioxide outlet; 9. Top blowing pipeline; 10. Bottom blowing pipeline; 11. Top blowing branch pipe; 12. Filter I; 13. Bottom blowing branch pipe; 14. Filter II; 15. Valve VI. DETAILED DESCRIPTION

[0025] The specific technical solutions of the present invention are further described below with reference to the accompanying drawings, so as to facilitate further understanding of the present invention by those skilled in the art, and do not constitute any limitation to the rights thereof.

[0026] Example 1, reference Figure 1-3 , a carbon dioxide top and bottom blowing system, comprising a liquid carbon dioxide storage tank 1, a heater 2, a buffer tank 3, a top blowing pipeline and a bottom blowing pipeline;

[0027] The bottom liquid carbon dioxide outlet of the carbon dioxide storage tank 1 is connected to the feed port of the buffer tank 3 through a pipeline;

[0028] The heater 2 is installed on the pipeline between the bottom liquid carbon dioxide outlet of the carbon dioxide storage tank 1 and the buffer tank 3. The heater 2 is a water bath heater. A valve Ⅰ4 and a valve Ⅱ5 are arranged on the pipeline between the bottom liquid carbon dioxide outlet of the carbon dioxide storage tank 1 and the heater 2. The valve Ⅰ4 is a quick-cut valve. A valve Ⅲ6 and a valve Ⅳ7 are installed on the pipeline between the heater 2 and the buffer tank 3. The valve Ⅳ7 is a check valve.

[0029] The buffer tank 3 is provided with a carbon dioxide outlet 8, and the inlet ends of the top blowing pipeline 9 and the bottom blowing pipeline 10 are connected in parallel to the carbon dioxide outlet 8 of the buffer tank 3;

[0030] The outlet end of the top blowing pipeline 9 is connected in parallel with a plurality of top blowing branch pipes 11 with spray guns at the outlet end. The top blowing pipeline 9 is provided with a stop valve, a filter I 12, a flow control valve, a pressure regulating valve, a flow control valve and a stop valve in sequence according to the airflow direction. The top blowing branch pipe 11 is provided with a stop valve, a pressure regulating valve and a check valve in sequence according to the airflow direction.

[0031] The outlet end of the bottom blowing pipeline 10 is connected in parallel with a plurality of bottom blowing branches 13 with spray guns at the outlet ends. The bottom blowing pipeline 10 is provided with valve V, filter II 14, pneumatic regulating valve group, pressure regulating valve, flow control valve, check valve and valve VI 15 in sequence according to the direction of airflow. The bottom blowing branch pipe 13 can also be provided with stop valve, pressure regulating valve and check valve in sequence according to the direction of airflow.

[0032] When the carbon dioxide top and bottom blowing system is used:

[0033] (1) First, the carbon dioxide in the carbon dioxide storage tank 1 in the oxygen plant passes through valve Ⅰ4, i.e., the quick-cut valve → valve Ⅱ5 → water bath heater 2 for heating. The heating temperature can be selected according to the use requirements. At this time, the liquid carbon dioxide is heated to become gas, passes through valve Ⅲ6 → valve Ⅳ7, i.e., the check valve → buffer tank 3, and comes out of the buffer tank 3 and is transported through pipelines to the top blowing pipeline 9 and bottom blowing pipeline 10 of the top blowing and bottom blowing valve stations of the steelmaking plant;

[0034] (2) Top blowing: The gas is transported through the pipeline to the top blowing pipeline 9 of the top blowing valve station (the gas pressure is approximately between 1.6MPa and 2.0MPa) → stop valve → filter I 12 → flow control valve → pressure regulating valve → flow control valve → stop valve, and enters the top blowing branch pipe 11, passes through the stop valve → pressure regulating valve → check valve in the top blowing branch pipe 11, and is sprayed out through the spray gun on the top blowing branch pipe 11;

[0035] (3) Bottom blowing: The gas is transported through the pipeline to the bottom blowing pipeline 10 of the bottom blowing valve station → valve V → filter II 14 → pneumatic regulating valve group → pressure regulating valve → flow control valve → check valve → valve IV 7, and enters the stop valve → pressure regulating valve → check valve → valve VI 15 in the bottom blowing branch pipe 13, and is sprayed out through the spray gun on the bottom blowing branch pipe 13.

[0036] This system uses carbon dioxide to react with carbon in molten steel to reduce the carbon content, thereby reducing oxygen consumption and lowering production costs. Compared with argon, carbon dioxide is usually cheaper, so using carbon dioxide can reduce production costs. In addition, carbon dioxide can react with sulfur in molten steel to generate compounds such as calcium sulfide, thereby reducing the sulfur content in steel and improving the quality of steel. Since carbon dioxide does not contain nitrogen, it can reduce the nitrogen content in molten steel and improve the quality of steel. Since carbon dioxide is a relatively environmentally friendly gas and its emission has little impact on the environment, the use of this system is more environmentally friendly. The carbon dioxide bottom blowing pipeline 10 can accelerate the chemical reaction rate in the steelmaking process, shorten the steelmaking time, and improve production efficiency.

Claims

1. A carbon dioxide top and bottom blowing system, characterized in that: Including liquid carbon dioxide storage tank, heater, buffer tank, top blowing pipeline and bottom blowing pipeline; The bottom liquid carbon dioxide outlet of the carbon dioxide storage tank is connected to the feed inlet of the buffer tank through a pipeline; The heater is installed on the pipeline between the bottom liquid carbon dioxide outlet of the carbon dioxide storage tank and the buffer tank, valves I and II are arranged on the pipeline between the bottom liquid carbon dioxide outlet of the carbon dioxide storage tank and the heater, and valves III and IV are installed on the pipeline between the heater and the buffer tank; The buffer tank is provided with a carbon dioxide outlet, and the inlet ends of the top blowing pipeline and the bottom blowing pipeline are connected in parallel to the carbon dioxide outlet of the buffer tank; The outlet end of the top-blowing pipeline is connected in parallel with a plurality of top-blowing branch pipes with spray guns at the outlet ends, and the outlet end of the bottom-blowing pipeline is connected in parallel with a plurality of bottom-blowing branch pipes with spray guns at the outlet ends.

2. A carbon dioxide top and bottom blowing system according to claim 1, characterized in that: The heater is a water bath heater.

3. A carbon dioxide top and bottom blowing system according to claim 1, characterized in that: The valve I described is a quick-cut valve.

4. A carbon dioxide top and bottom blowing system according to claim 1, characterized in that: The valve IV is a check valve.

5. A carbon dioxide top and bottom blowing system according to claim 1, characterized in that: The top blowing pipeline is provided with a stop valve, a filter I, a flow control valve, a pressure regulating valve, a flow control valve and a stop valve in sequence according to the air flow direction.

6. A carbon dioxide top and bottom blowing system according to claim 1, characterized in that: The top blowing branch pipe is provided with a stop valve, a pressure regulating valve and a check valve in sequence according to the air flow direction.

7. A carbon dioxide top and bottom blowing system according to claim 1, characterized in that: The bottom blowing pipeline is provided with a valve V, a filter II, a pneumatic regulating valve group, a pressure regulating valve, a flow control valve, a check valve and a valve VI in sequence according to the air flow direction.

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