Alkali spraying and acid removing device for converter gas

Abstract

The utility model relates to an alkali spraying and acid removing device for converter gas. Comprising an alkali storage tank, a water storage tank, an alkali liquor pump, a liquid pressure sensor II, a pressure pump, a liquid flow sensor, a liquid pressure sensor I, an electric flow regulating valve, a gas pressure sensor, a spray gun, a converter gas pipeline, a dehydrator, a pH value detection device, an electric control cabinet, a liquid supply unit, a gas supply unit, a spray unit and a dehydrator drain pipe. The device can automatically adjust the liquid spraying amount generated by the spraying gun according to the pH value, fed back by the monitoring unit, of condensate water in the pipeline, manual operation is reduced, acidic substances in the pipeline can be effectively neutralized, equipment corrosion is reduced, and the safe operation period of equipment is prolonged.

Description

Technical Field

[0001] This patent application belongs to the field of metallurgical technology, and more specifically, it relates to an alkali spraying and acid removal device for converter gas, used to prevent corrosion of converter gas pipelines and auxiliary facilities. Background Technology

[0002] In the steelmaking process of a converter, converter gas is produced intermittently. After being pressurized in a gas holder, the converter gas is continuously supplied to downstream users through iron pipelines. However, converter gas typically contains 20% carbon dioxide, which dissolves in water to form acidic substances. In actual production, as the gas temperature decreases and water is released, the carbon dioxide in the gas dissolves in the condensate, forming corrosive acidic wastewater. Under the prolonged corrosive effect of this acidic wastewater, iron pipelines and auxiliary facilities are highly susceptible to damage, leading to gas leaks and even safety accidents, resulting in economic losses and maintenance costs. Furthermore, the corrosiveness of this acidic wastewater increases the difficulty of recycling and reuse. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide an alkali spraying and acid removal device for converter gas. This device can effectively neutralize acidic substances in the pipeline, reduce equipment corrosion, extend the safe operation cycle of the equipment, and thus avoid economic losses caused by equipment corrosion.

[0004] To solve the above problems, the technical solution adopted by this utility model is as follows:

[0005] An alkaline spray deacidification device for converter gas includes a spray unit installed in a converter gas pipeline, a liquid supply unit and a gas supply unit connected to the spray unit, a dehydrator connected to the end of the converter gas pipeline, a dehydrator drain pipe connected to the bottom of the dehydrator, a pH value detection device installed on the dehydrator drain pipe, and an electrical control cabinet connected to the pH value detection device. The electrical control cabinet is also connected to the liquid supply unit, the gas supply unit, and the spray unit. The lower part of the dehydrator is also connected to the converter gas pipeline.

[0006] The liquid supply unit is used to supply low-concentration alkaline solution to the spray unit; the gas supply unit is used to supply nitrogen to the spray unit; and the electrical control cabinet is used to control and adjust the amount of alkaline sprayed by the spray unit.

[0007] Furthermore, the spray unit includes two spray guns, which pass through the converter gas pipeline and are symmetrically installed on both sides inside the converter gas pipeline.

[0008] Furthermore, the liquid supply unit includes an independently set alkali storage tank and a water storage tank, a pressure pump connected to both the alkali storage tank and the water storage tank via a liquid supply pipeline, and an alkali pump installed on the liquid supply pipeline of the alkali storage tank. The pressure pump and the spray unit are connected via a transmission pipeline, which is equipped with a liquid flow sensor and a liquid pressure sensor.

[0009] Furthermore, both the alkali pump and the booster pump are installed in parallel, with one in use and one on standby.

[0010] Furthermore, a second liquid pressure sensor is also provided, which is installed on the liquid supply pipeline and located in front of the pressurization pump.

[0011] Furthermore, the gas supply unit includes a nitrogen pipeline connected to nitrogen, an electric flow regulating valve and a gas pressure sensor sequentially installed on the nitrogen pipeline, and the nitrogen pipeline is connected to the spray unit.

[0012] Furthermore, the electrical control cabinet includes a control box and a touch screen installed on the control box. The control box is electrically connected to the pH value detection device, liquid pressure sensor II, liquid flow sensor, liquid pressure sensor I, electric flow regulating valve, and gas pressure sensor. The control box is also electrically connected to the pressurization pump and alkali pump.

[0013] The beneficial effects achieved by this utility model due to the adoption of the above technical solution are as follows:

[0014] This invention features a simple structure, ease of use, and a high degree of automation. It can automatically start, stop, and adjust the entire device based on the pH value of the condensate in the downstream pipeline, ensuring the pH value of the condensate meets requirements while preventing material waste. It effectively neutralizes acidic substances in the pipeline to reduce corrosion and significantly reduces manual operation. This invention can be widely applied to various converter gas pipelines in industrial enterprises. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model.

[0016] Figure 2 yes Figure 1 A schematic diagram of the flow direction.

[0017] The following are the markings in the diagram: Alkali storage tank 1, Water storage tank 2, Alkali pump 3, Liquid pressure sensor 2 4, Pressurization pump 5, Liquid flow sensor 6, Liquid pressure sensor 1 7, Electric flow regulating valve 8, Gas pressure sensor 9, Spray gun 10, Converter gas pipeline 11, Dehydrator 12, pH value detection device 13, Electrical control cabinet 14, Liquid supply unit 15, Gas supply unit 16, Spray unit 17, Dehydrator drain pipe 18. Detailed Implementation

[0018] The present invention will be further described in detail below with reference to the embodiments.

[0019] An alkali spraying deacidification device for converter gas includes a spray unit 17 installed in a converter gas pipeline 11, a liquid supply unit 15 and a gas supply unit 16 connected to the spray unit 17, a dehydrator 12 connected to the end of the converter gas pipeline 11, a dehydrator drain pipe 18 connected to the bottom of the dehydrator 12, a pH value detection device 13 installed on the dehydrator drain pipe 18, and an electrical control cabinet 14 connected to the pH value detection device 13. The electrical control cabinet 14 is also connected to the liquid supply unit 15, the gas supply unit 16, and the spray unit 17. The lower part of the dehydrator 12 is also connected to the converter gas pipeline 11.

[0020] The liquid supply unit 15 is used to supply low-concentration alkaline solution to the spray unit 17; the gas supply unit 16 is used to supply nitrogen gas to the spray unit 17; and the electrical control cabinet 14 is used to control and adjust the amount of alkaline sprayed by the spray unit 17.

[0021] The spray unit 17 includes two spray guns 10, which pass through the converter gas pipe and are symmetrically installed on both sides of the converter gas pipe 11.

[0022] The liquid supply unit 15 includes an independently installed alkali storage tank 1 and a water storage tank 2, a pressure pump 5 connected to both the alkali storage tank 1 and the water storage tank 2 via a liquid supply pipeline, and an alkali pump 3 installed on the liquid supply pipeline of the alkali storage tank 1. The pressure pump 5 and the spray unit 17 are connected via a transmission pipeline, which is equipped with a liquid flow sensor 6 and a liquid pressure sensor 7. Both the alkali pump 3 and the pressure pump 5 are installed in parallel.

[0023] A second liquid pressure sensor 4 is also provided, which is installed on the liquid supply pipeline and located in front of the pressurization pump 5. The gas supply unit 16 includes a nitrogen pipeline connected to nitrogen, an electric flow regulating valve 8 and a gas pressure sensor 9 installed sequentially on the nitrogen pipeline, and the nitrogen pipeline is connected to the spray unit 17.

[0024] The electrical control cabinet 14 includes a control box and a touch screen on the control box. The control box is electrically connected to the pH value detection device 13, the liquid pressure sensor 2 4, the liquid flow sensor 6, the liquid pressure sensor 1 7, the electric flow regulating valve 8, and the gas pressure sensor 9. The control box is also electrically connected to the pressurizing pump 5 and the alkali pump (3).

[0025] An embodiment of this utility model is as follows:

[0026] like Figure 1 , Figure 2An alkali spraying deacidification device for converter gas includes a spray unit 17 installed inside a converter gas pipeline, a liquid supply unit 15 and a gas supply unit 16 both connected to the spray unit 17, a dehydrator 12 connected to the end of the converter gas pipeline, a dehydrator drain pipe 18 connected to the bottom of the dehydrator 12, a pH value detection device 13 installed on the dehydrator drain pipe 18, and an electrical control cabinet 14 connected to the pH value detection device 13. The electrical control cabinet 14 is also connected to the liquid supply unit 15, the gas supply unit 16, and the spray unit 17. A converter gas pipeline 11 is also connected to the lower part of the dehydrator 12 and above the dehydrator drain pipe 18. Figure 1 The locations marked 11 on the converter gas pipeline all indicate the direction of converter gas flow.

[0027] The liquid supply unit 15 is used to supply low-concentration alkaline solution to the spray unit 17; the gas supply unit 16 is used to supply nitrogen gas to the spray unit 17; and the electrical control cabinet 14 is used to control and adjust the amount of alkaline sprayed by the spray unit 17.

[0028] The spray unit 17 includes two spray guns 10, which pass through the converter gas pipe and are symmetrically installed on both sides of the converter gas pipe 11.

[0029] The liquid supply unit 15 includes an independently installed alkali storage tank 1 and a water storage tank 2, a booster pump 5 connected to both the alkali storage tank 1 and the water storage tank 2 via a liquid supply pipeline, and an alkali pump 3 installed on the liquid supply pipeline of the alkali storage tank 1. The booster pump 5 and the spray system 17 are connected via a transmission pipeline, which is equipped with a liquid flow sensor 6 and a liquid pressure sensor 7. The input end of the water storage tank 2 is connected to the industrial water network via a pipeline, and the output end is connected to the booster pump 5 via a pipeline. Both the alkali pump 3 and the booster pump 5 are installed in parallel, one in use and one on standby.

[0030] It is also equipped with a liquid pressure sensor 24, which is installed on the liquid supply pipeline and is located in front of the pressure pump 5.

[0031] The gas supply unit 16 includes a nitrogen pipeline connected to nitrogen, an electric flow regulating valve 8 and a gas pressure sensor 9 arranged sequentially on the nitrogen pipeline, and the nitrogen pipeline is connected to the spray unit 17.

[0032] The electrical control cabinet 14 includes a control box (PLC controller, microcontroller or other controller, which is conventional technology and not the core of this case), a touch screen installed on the control box (which may also include electrical components such as frequency converters, which are existing technologies), and the control box is electrically connected to the pH value detection device 13, liquid pressure sensor 2 4, liquid flow sensor 6, liquid pressure sensor 1 7, electric flow regulating valve 8, and gas pressure sensor 9.

[0033] pH value detection device 13 is installed on the drain pipe 18 of the dehydrator and is electrically connected to the electrical control cabinet 14.

[0034] In use, this invention uses two spray guns 10 to spray atomized alkaline solution into the converter gas pipeline, which comes into full contact with the flowing converter gas, causing a neutralization reaction and removing carbon dioxide from the gas. Simultaneously, after receiving a signal from the pH detection device 13, the electrical control cabinet 14 adjusts the pressurization pump 5, the electric flow regulating valve 8, and the alkaline solution pump 3 to ensure that the pH value of the pipeline condensate meets production requirements.

[0035] One alkali storage tank has a volume of 20m³, is made of horizontal fiberglass with a thickness of 12mm, and is equipped with a magnetic level gauge and inlet / outlet valves;

[0036] Two water storage tanks with a volume of 3m³, made of 304 stainless steel, equipped with magnetic level gauges and inlet / outlet valves;

[0037] Alkali pump 3 has a flow rate of 150 L / h and a head of 100 m;

[0038] 5-watt booster pump with a power of 4kW;

[0039] Two spray guns, model 10, SCI03020L6-800-90-M1;

[0040] Figure 1 The uppermost converter gas pipe has a diameter of DN1800mm, with a converter gas pressure of 2.3-3KPa.

[0041] Dehydrator 12 adopts a cyclone dehydrator;

[0042] The pH value detection device 13 is installed on the drain pipe 18 of the dehydrator, with a flange mounting, outputting a 4-20mA signal, and is electrically explosion-proof;

[0043] The PLC controller in electrical control cabinet 14 uses Siemens S7-1200 series products.

[0044] Nitrogen is supplied directly from the pipeline network at a pressure of 0.6 MPa.

Claims

1. A caustic injection acid removal device for converter gas, characterized by: The device comprises a spraying unit (17) installed in a converter gas pipeline (11), a liquid supply unit (15) and a gas supply unit (16) connected with the spraying unit (17), a dehydrator (12) connected with the end of the converter gas pipeline (11), a dehydrator drain pipe (18) connected with the bottom end of the dehydrator (12), a pH value detection device (13) installed on the dehydrator drain pipe (18), and an electrical control cabinet (14) connected with the pH value detection device (13); the electrical control cabinet (14) is also connected with the liquid supply unit (15), the gas supply unit (16) and the spraying unit (17), and the lower part of the dehydrator (12) is also connected with the converter gas pipeline (11). The liquid supply unit (15) is used for supplying low-concentration lye to the spraying unit (17); the gas supply unit (16) is used for supplying nitrogen to the spraying unit (17); and the electrical control cabinet (14) is used for controlling the amount of lye sprayed by the spraying unit (17).

2. A device for removing acid from converter gas by spraying alkali according to claim 1, characterized in that: The spraying unit (17) comprises two spray guns (10) penetrating through the converter gas pipeline and symmetrically installed on both sides of the converter gas pipeline (11).

3. A device for removing acid from converter gas by spraying alkali according to claim 2, characterized in that: The liquid supply unit (15) comprises a lye storage tank (1) and a water storage tank (2) independently arranged, a pressurizing pump (5) connected with the lye storage tank (1) and the water storage tank (2) through a liquid supply pipeline, and a lye pump (3) arranged on the liquid supply pipeline of the lye storage tank (1); the pressurizing pump (5) and the spraying unit (17) are connected through a transmission pipeline, and the transmission pipeline is provided with a liquid flow sensor (6) and a liquid pressure sensor I (7).

4. A device for removing acid from converter gas by spraying alkali according to claim 3, characterized in that: The lye pump (3) and the pressurizing pump (5) are both arranged in parallel.

5. A device for removing acid from converter gas by injection of alkali according to claim 4, characterized in that: A liquid pressure sensor II (4) is further arranged on the liquid supply pipeline and located on the front side of the pressurizing pump (5).

6. A device for removing acid from converter gas by injection of alkali according to claim 5, characterized in that: The gas supply unit (16) comprises a nitrogen pipeline connected with nitrogen, an electric flow regulating valve (8) and a gas pressure sensor (9) arranged on the nitrogen pipeline in sequence, and the nitrogen pipeline is connected with the spraying unit (17).

7. A device for removing acid from converter gas by injection of alkali according to claim 6, characterized in that: The electrical control cabinet (14) comprises a control box and a touch display screen arranged on the control box; the control box is electrically connected with the pH value detection device (13), the liquid pressure sensor II (4), the liquid flow sensor (6), the liquid pressure sensor I (7), the electric flow regulating valve (8) and the gas pressure sensor (9); and the control box is electrically connected with the pressurizing pump (5) and the lye pump (3).

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