Hot gas valve bottom nitrogen purging device and method

Abstract

The invention belongs to the technical field of gas valve equipment, and particularly discloses a hot gas valve bottom nitrogen purging device which comprises a nitrogen supply system, a purging nozzle assembly and a control system used for automatically controlling the nitrogen purging process, and the nitrogen supply system comprises a nitrogen storage tank and a nitrogen conveying pipeline. One end of the nitrogen conveying pipeline is communicated with the nitrogen storage tank, the other end of the nitrogen conveying pipeline is communicated with the purging nozzle assembly, the purging nozzle assembly is connected with a purging connector in the bottom of the hot gas valve, and a pressure adjusting valve, a pressure gauge, a flow meter, a first manual stop valve, a pneumatic stop valve and a check valve are sequentially installed on the nitrogen conveying pipeline. And the control system is electrically connected with the hot gas valve, the pressure regulating valve, the flow meter, the pressure gauge and the pneumatic cut-off valve. High-pressure nitrogen is introduced into the bottom of the hot gas valve, so that deposits at the bottom of the valve are purged and cleaned in real time, normal operation of the valve is guaranteed, and safety and stability of a production system are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of gas valve equipment, and in particular to a nitrogen purge device and method for the bottom of a hot gas valve. Background Art

[0002] High-temperature hot gas is widely used as an important energy medium in industries such as metallurgy and chemical engineering. As a key device for controlling the flow of hot gas, the stable operation of hot gas valves directly impacts the safety and continuity of the entire production system. However, during actual operation, impurities such as dust, tar, and carbon deposits carried by the hot gas, as well as condensate generated by temperature fluctuations and refractory material debris caused by temperature fluctuations, gradually accumulate at the bottom of the hot gas valve. This accumulation not only increases the valve's operating resistance, resulting in poor opening and closing, but can also damage the valve's sealing structure, causing gas leaks and potentially leading to safety accidents. Furthermore, the long-term presence of accumulation accelerates corrosion of valve bottom components, shortening the valve's service life and increasing equipment maintenance costs. Currently, the main method for cleaning gas valves is manual disassembly and cleaning. This method is not only labor-intensive and inefficient, but also requires the blast furnace to be shut down and production interrupted. Furthermore, the disassembly process carries the risk of gas leakage, posing a threat to the operator's safety. Therefore, the development of a device and method for real-time and effective purging and cleaning of the bottom of hot gas valves is of great practical significance. Summary of the Invention

[0003] The present invention aims to provide a device and method for purging nitrogen from the bottom of a hot gas valve. By introducing high-pressure nitrogen into the bottom of the hot gas valve, the device can purge and clean the deposits at the bottom of the valve in real time, thereby ensuring the normal operation of the valve and improving the safety and stability of the production system.

[0004] To achieve the above objectives, the present invention provides a basic solution: a nitrogen purge device at the bottom of a hot gas valve, comprising a nitrogen supply system, a control system for automatically controlling the nitrogen purge process, and a purge nozzle assembly. The nitrogen supply system includes a nitrogen storage tank and a nitrogen delivery pipeline, one end of the nitrogen delivery pipeline is connected to the nitrogen storage tank, and the other end is connected to the purge nozzle assembly. The purge nozzle assembly is connected to the purge interface at the bottom of the hot gas valve. A pressure regulating valve, a pressure gauge, a flow meter, a first manual shut-off valve, a pneumatic shut-off valve, and a check valve are sequentially installed on the nitrogen delivery pipeline. The control system is electrically connected to the hot gas valve, pressure regulating valve, flow meter, pressure gauge, and pneumatic shut-off valve.

[0005] Furthermore, the purge nozzle assembly includes a purge nozzle tube, which is provided with a second manual shut-off valve. The purge nozzle tube is connected to the purge interface flange of the hot gas valve, one end of the purge nozzle tube is connected to the nitrogen delivery pipeline, and the other end of the purge nozzle tube extends to the interior of the hot gas valve.

[0006] Furthermore, 3-6 nitrogen purge holes are provided at the bottom end of the tube wall of the purge nozzle tube.

[0007] A method for purging nitrogen from the bottom of a hot gas valve, comprising the following steps: Purge parameter setting: The operator presets the nitrogen purge pressure, purge time and purge cycle on the human-machine interface of the control system according to the hydrogen enrichment ratio of the blast furnace hot gas; Purge start: The control system opens the pneumatic shut-off valve on the nitrogen delivery pipeline at a fixed time according to the preset purge cycle, allowing nitrogen to enter the pressure regulating valve. After pressure regulation, nitrogen is sprayed to the bottom of the hot gas valve through the purge nozzle assembly at the preset pressure; Purge process control: During the purge process, the control system monitors the flow rate and pressure of nitrogen in real time through the flow meter and pressure gauge. If the actual purge pressure deviates from the preset value, the control system controls the opening of the pressure regulating valve to restore the purge pressure to the preset value; End of purge: When the purge time reaches the preset value, the control system closes the pneumatic shut-off valve on the nitrogen delivery pipeline, stops nitrogen purge, and repeats the above steps when the next purge cycle arrives.

[0008] Furthermore, in the purge parameter setting step, the specific method for presetting the purge pressure, purge time and purge cycle according to the hydrogen enrichment ratio of the blast furnace hot gas is as follows: 1) When the hydrogen enrichment ratio of hot coal gas is less than or equal to 50m 3 / t, no purge; 2) When the hydrogen enrichment ratio of hot coal gas is 50-100m 3 / t, the purge pressure is preset to 0.4MPa, the purge time is preset to 3min, the purge cycle is preset to 0.5h, and the purge cycle is preset to 0.5h; 3) When the hydrogen enrichment ratio of hot coal gas is 100-150m 3 / t, the purge pressure is preset to 0.4MPa, the purge time is preset to 5min, and the purge cycle is preset to 0.5 hour; 4) When the hydrogen enrichment ratio of hot coal gas is 150-200m 3 / t, the purge pressure is preset to 0.5MPa, the purge time is preset to 10min, and the purge cycle is preset to 0.5 hour; 5) When the hydrogen-rich ratio of hot coal gas is greater than 200m 3 / t, the purge pressure is preset to 0.6MPa, the purge time is preset to 10min, and the purge cycle is preset to 0.5 hour.

[0009] Furthermore, during the purge control process, the control system monitors the temperature of the bottom of the hot gas valve in real time through the infrared camera on the hot gas valve. The operator views the temperature of the bottom of the hot gas valve in real time during the purge process through the human-machine interface and manually intervenes in the purge time based on the monitored temperature of the bottom of the hot gas valve.

[0010] Furthermore, the specific method for the operator to manually intervene in the purge time according to the monitored temperature at the bottom of the hot gas valve is as follows: When the temperature at the bottom of the hot gas valve is less than 60°C, the operator sets the purge time to 10 minutes on the human-machine interface of the control system. When the temperature at the bottom of the hot gas valve is greater than or equal to 60°C, the operator sets the purge time to 5 minutes on the human-machine interface of the control system. Compared with the prior art, the advantages of the present invention are: 1. Improve valve operation reliability: Through real-time purging and cleaning, it effectively prevents the accumulation of impurities, carbon deposits, refractory material shedding, and condensate at the bottom of the hot gas valve, reduces valve operation resistance, ensures smooth valve opening and closing, avoids sealing failure and leakage problems caused by accumulation, and improves valve operation reliability and safety.

[0011] 2. Reduce equipment maintenance costs: It reduces the workload of manual regular disassembly and cleaning, reduces the blast furnace outage time caused by hot gas valve failure, extends the service life of the valve, and thus reduces equipment maintenance costs.

[0012] 3. Realize automatic control: The control system can automatically adjust the purge process according to preset parameters and real-time monitoring data, which improves the accuracy and stability of the purge, while reducing the labor intensity of the operator and the influence of human factors.

[0013] 4. Strong adaptability: The adjustable design of the purge nozzle assembly enables it to adapt to hot gas valves of different models and structures, and has a wide range of application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a structural schematic diagram of a nitrogen purge device at the bottom of a hot gas valve according to the present invention. DETAILED DESCRIPTION

[0015] The present invention will be further described in detail below through specific embodiments: The reference numerals in the drawings of the specification include: hot gas valve 1, purge nozzle pipe 2, second manual shut-off valve 3, check valve 4, pneumatic shut-off valve 5, first manual shut-off valve 6, flow meter 7, pressure gauge 8, pressure regulating valve 9, nitrogen storage tank 10, and nitrogen delivery pipeline 11.

[0016] like Figure 1 The figure shows: a nitrogen purge device at the bottom of a hot gas valve, including a nitrogen supply system, a purge nozzle assembly and a control system for automatically controlling the nitrogen purge process. The purge nozzle assembly includes a purge nozzle pipe 2, on which a second manual shut-off valve 3 is provided. The purge nozzle pipe 2 is flange-connected to the purge interface of the hot gas valve 1, one end of the purge nozzle pipe 2 extends into the interior of the hot gas valve 1, and the bottom end of the pipe wall of the purge nozzle pipe 2 is provided with 3-6 purge nitrogen holes; the nitrogen supply system includes a nitrogen storage tank 10 and a nitrogen delivery pipeline 11, one end of the nitrogen delivery pipeline 11 is connected to the nitrogen storage tank 10, and the other end is connected to the end of the purge nozzle pipe 2 away from the hot gas valve 1. A pressure regulating valve 9, a pressure gauge 8, a flow meter 7, a first manual shut-off valve 6, a pneumatic shut-off valve 5 and a check valve 4 are installed in sequence on the nitrogen delivery pipeline 11. The control system is electrically connected to the hot gas valve 1, the pressure regulating valve 9, the flow meter 7, the pressure gauge 8 and the pneumatic shut-off valve 5.

[0017] A method for purging nitrogen from the bottom of a hot gas valve, comprising the following steps: Purge parameter setting: The operator presets the nitrogen purge pressure, purge time and purge cycle on the human-machine interface of the control system according to the hydrogen rich ratio of the blast furnace hot gas. The specific method for preset the purge pressure, purge time and purge cycle according to the hydrogen rich ratio of the blast furnace hot gas is as follows: 1) When the hydrogen enrichment ratio of hot coal gas is less than or equal to 50m 3 / t, no purge; 2) When the hydrogen enrichment ratio of hot coal gas is 50-100m 3 / t, the purge pressure is preset to 0.4MPa, the purge time is preset to 3min, the purge cycle is preset to 0.5h, and the purge cycle is preset to 0.5h; 3) When the hydrogen enrichment ratio of hot coal gas is 100-150m 3 / t, the purge pressure is preset to 0.4MPa, the purge time is preset to 5min, and the purge cycle is preset to 0.5 hours; 4) When the hydrogen enrichment ratio of hot coal gas is 150-200m 3 / t, the purge pressure is preset to 0.5MPa, the purge time is preset to 10min, and the purge cycle is preset to 0.5 hour; 5) When the hydrogen-rich ratio of hot coal gas is greater than 200m 3The purge pressure is preset to 0.6 MPa, the purge time is preset to 10 min, and the purge cycle is preset to 0.5 h; The purge is started: the control system opens the pneumatic cut valve 5 on the nitrogen conveying pipeline 11 according to the preset purge cycle, so that nitrogen enters the pressure regulating valve 9, and after pressure regulation, nitrogen is sprayed to the bottom of the hot gas valve 1 through the preset pressure of the purge nozzle assembly; The purge process is controlled: during the purge process, the control system monitors the flow and pressure of nitrogen in real time through the flow meter 7 and the pressure gauge 8, and if the actual purge pressure deviates from the preset value, the control system controls the opening of the pressure regulating valve 9 to restore the purge pressure to the preset value. The purge is ended: when the purge time reaches the preset value, the control system closes the pneumatic cut valve 5 on the nitrogen conveying pipeline 11 to stop the nitrogen purge, and repeats the above steps when the next purge cycle comes.

[0018] During the purge control process, the control system monitors the temperature at the bottom of the hot gas valve 1 in real time through the infrared camera on the hot gas valve 1, and the operator views the temperature at the bottom of the hot gas valve 1 in real time through the man-machine interface, and manually intervenes in the purge time according to the monitored temperature at the bottom of the hot gas valve 1. The specific method of manual intervention in the purge time by the operator according to the temperature at the bottom of the hot gas valve 1 is as follows: When the temperature at the bottom of the hot gas valve 1 is less than 60℃, the operator sets the purge time to 10 min on the man-machine interface of the control system, and when the temperature at the bottom of the hot gas valve 1 is greater than or equal to 60℃, the operator sets the purge time to 5 min on the man-machine interface of the control system.

[0019] The above is only an embodiment of the present application, and the specific structure and characteristics of the scheme are not described in detail. It should be noted that for those skilled in the art, without departing from the structure of the present application, a number of modifications and improvements can be made, which should be regarded as the protection scope of the present application, which does not affect the effect and practicality of the patent. The protection scope claimed in this application should be subject to the content of its claims, and the specific implementation mode and the like recorded in the specification can be used to explain the content of the claims.

Claims

1. A nitrogen purge device at the bottom of a hot gas valve, characterized in that: The invention comprises a nitrogen supply system, a purge nozzle assembly and a control system for automatically controlling a nitrogen purge process, wherein the nitrogen supply system comprises a nitrogen storage tank (10) and a nitrogen delivery pipeline (11), one end of the nitrogen delivery pipeline (11) is connected to the nitrogen storage tank (10), and the other end is connected to the purge nozzle assembly, the purge nozzle assembly is connected to a purge interface at the bottom of a hot gas valve (1), a pressure regulating valve (9), a pressure gauge (8), a flow meter (7), a first manual shut-off valve (6), a pneumatic shut-off valve (5) and a check valve (4) are sequentially installed on the nitrogen delivery pipeline (11), and the control system is electrically connected to the hot gas valve (1), the pressure regulating valve (9), the flow meter (7), the pressure gauge (8) and the pneumatic shut-off valve (5).

2. A nitrogen purge device at the bottom of a hot gas valve according to claim 1, characterized in that: The purge nozzle assembly comprises a purge nozzle pipe (2), a second manual shut-off valve (3) is provided on the purge nozzle pipe (2), the purge nozzle pipe (2) is flange-connected to the purge interface of the hot gas valve (1), one end of the purge nozzle pipe (2) is in communication with the nitrogen delivery pipeline (11), and the other end of the purge nozzle pipe (2) extends into the interior of the hot gas valve (1).

3. The nitrogen purge device at the bottom of a hot gas valve according to claim 1, characterized in that: The bottom end of the purge nozzle tube (2) is provided with 3-6 purge nitrogen holes.

4. A method for purging nitrogen from the bottom of a hot gas valve, characterized in that: The following steps are involved: Purge parameter setting: The operator presets the nitrogen purge pressure, purge time and purge cycle on the human-machine interface of the control system according to the hydrogen enrichment ratio of the blast furnace hot gas; Purge start: The control system opens the pneumatic shut-off valve (5) on the nitrogen delivery pipe (11) at a predetermined time according to the preset purge cycle, allowing nitrogen to enter the pressure regulating valve (9). After pressure regulation, nitrogen is sprayed toward the bottom of the hot gas valve (1) through the purge nozzle assembly at a predetermined pressure. Purge process control: During the purge process, the control system monitors the flow rate and pressure of nitrogen in real time through the flow meter (7) and the pressure gauge (8). If the actual purge pressure deviates from the preset value, the control system controls the opening of the pressure regulating valve (9) to restore the purge pressure to the preset value. End of purge: When the purge time reaches the preset value, the control system closes the pneumatic shut-off valve (5) on the nitrogen delivery pipeline (11), stops nitrogen purge, and repeats the above steps when the next purge cycle arrives.

5. A nitrogen purging method for the bottom of a hot gas valve according to claim 4, characterized in that: In the purge parameter setting step, the specific method for presetting the purge pressure, purge time and purge cycle according to the hydrogen enrichment ratio of the blast furnace hot gas is as follows: 1) When the hydrogen enrichment ratio of hot coal gas is less than or equal to 50m 3 / t, no purge; 2) When the hydrogen enrichment ratio of hot coal gas is 50-100m 3 / t, the purge pressure is preset to 0.4MPa, the purge time is preset to 3min, the purge cycle is preset to 0.5h, and the purge cycle is preset to 0.5h; 3) When the hydrogen enrichment ratio of hot coal gas is 100-150m 3 / t, the purge pressure is preset to 0.4MPa, the purge time is preset to 5min, and the purge cycle is preset to 0.5 hour; 4) When the hydrogen enrichment ratio of hot coal gas is 150-200m 3 / t, the purge pressure is preset to 0.5MPa, the purge time is preset to 10min, and the purge cycle is preset to 0.5 hour; 5) When the hydrogen rich ratio of hot coal gas is greater than 200m 3 / t, the purge pressure is preset to 0.6MPa, the purge time is preset to 10min, and the purge cycle is preset to 0.5 hour.

6. A nitrogen purging method for the bottom of a hot gas valve according to claim 5, characterized in that: During the purge control process, the control system monitors the temperature of the bottom of the hot gas valve (1) in real time through the infrared camera on the hot gas valve (1). The operator views the temperature of the bottom of the hot gas valve (1) in real time during the purge process through the human-machine interface, and manually intervenes in the purge time according to the monitored temperature of the bottom of the hot gas valve (1).

7. A nitrogen purging method for the bottom of a hot gas valve according to claim 6, characterized in that: The specific method for the operator to manually intervene in the purge time based on the monitored temperature at the bottom of the hot gas valve (1) is as follows: When the temperature of the bottom of the hot gas valve (1) is less than 60°C, the operator sets the purge time to 10 minutes on the human-machine interface of the control system. When the temperature of the bottom of the hot gas valve (1) is greater than or equal to 60°C, the operator sets the purge time to 5 minutes on the human-machine interface of the control system.

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