Parallel instrument air ducts for side-blown furnaces

Abstract

A parallel instrument air duct for a side-blown furnace includes an instrument air duct and a nitrogen line. The inlet section of the instrument air duct is equipped with a first pressure sensor, and the outlet section is equipped with a second pressure sensor. The middle section of the instrument air duct connects to the nitrogen line, and the outlet section of the nitrogen line is equipped with a second electric valve. The first electric valve is located in the first half of the nitrogen line, between the first pressure sensor and the connection point of the nitrogen line. A gas buffer device is located in the second half of the nitrogen line, between the connection point of the nitrogen line and the second pressure sensor. This design ensures stable gas supply pressure, improves the operational reliability of the instrument air duct, eliminates valve malfunctions caused by insufficient instrument air pressure, guarantees safe production, and prevents furnace overheating and freezing accidents due to insufficient pressure in the instrument air duct.

Description

Technical Field

[0001] This utility model relates to the field of gas pipeline technology, specifically to a parallel instrument air duct for a side-blown furnace. Background Technology

[0002] In zinc smelting and leaching slag treatment processes, the use of side-blown melting furnaces (side-blown furnaces) and fuming furnaces has become the mainstream solution in the industry. During production, the side-blown furnace, as a core piece of equipment, relies on the precise control of various gas media for stable operation. The gas piping system of the side-blown furnace mainly includes: a mixed oxygen-enriched gas pipeline providing an oxidizing atmosphere for combustion within the furnace; a compressed air pipeline for regulating the mixing of the oxygen-enriched gas; a nitrogen pipeline for lance protection and pulverized coal fluidization; and an instrument air pipeline controlling all pneumatic valves of the pulverized coal injection system.

[0003] However, existing instrument air duct systems have the following prominent problems: the stability of the air pressure in the instrument air duct is crucial, and its pressure fluctuations directly affect the reliability of the pneumatic valves. When the pressure in the instrument air duct is insufficient, it will cause the valves to respond late or fail. When the air pressure in the existing instrument air duct fluctuates, the traditional emergency measures respond slowly, which may cause fluctuations in the furnace condition of the side-blown furnace, furnace explosion, or even furnace freezing accidents.

[0004] Therefore, there is an urgent need in the existing technology for a parallel instrument air duct for a side-blown furnace that can ensure stable gas supply pressure. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a parallel instrument air duct for a side-blown furnace that can ensure stable gas supply pressure.

[0006] The purpose of this utility model is achieved through the following technical solution: a parallel instrument air duct for a side-blown furnace, comprising an instrument air duct and a nitrogen duct, wherein a first pressure detection sensor is provided in the air inlet section of the instrument air duct, a second pressure detection sensor is provided in the air outlet section of the instrument air duct, the middle section of the instrument air duct is connected to the nitrogen duct, a second electric valve is provided in the air outlet section of the nitrogen duct, a first electric valve is provided in the first half section of the nitrogen duct, the first electric valve being located between the first pressure detection sensor and the connection point of the nitrogen duct, and a gas buffer device is provided in the second half section of the nitrogen duct, the gas buffer device being located between the connection point of the nitrogen duct and the second pressure detection sensor.

[0007] The gas buffer device includes a housing, an air inlet pipe located on the left side of the housing and communicating with the inside of the housing, an air outlet pipe located on the right side of the housing and communicating with the inside of the housing, and a first buffer baffle and a second buffer baffle located in the left half of the housing. The first buffer baffle extends obliquely to the upper right from the bottom surface of the housing and is connected to the bottom surface and the front and rear sides of the housing. A gap is left between the first buffer baffle and the top surface of the housing. The second buffer baffle extends obliquely to the lower right from the top surface of the housing and is connected to the top surface and the front and rear sides of the housing. A gap is left between the second buffer baffle and the bottom surface of the housing.

[0008] The beneficial effects of this utility model are: it can ensure stable gas supply pressure, improve the operational reliability of instrument air ducts, eliminate valve failures caused by insufficient instrument air pressure, ensure safe production, and thus avoid furnace explosions and freezing accidents caused by insufficient pressure in instrument air ducts. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of a gas buffer device.

[0010] In the diagram: 1-Instrument air duct; 2-Nitrogen duct; 3-First pressure sensor; 4-First electric valve; 5-Second electric valve; 6-Gas buffer device; 7-Second pressure sensor; 8-Box; 9-First buffer baffle; 10-Second buffer baffle; 11-Inlet pipe; 12-Outlet pipe. Detailed Implementation

[0011] The present invention will now be described in detail with reference to the accompanying drawings.

[0012] like Figure 1 As shown, a parallel instrument air duct 1 for a side-blown furnace includes an instrument air duct 1 and a nitrogen duct 2. The inlet section of the instrument air duct 1 is equipped with a first gas pressure detection sensor 3, and the outlet section of the instrument air duct 1 is equipped with a second gas pressure detection sensor 7. The middle section of the instrument air duct 1 is connected to the nitrogen duct 2. The outlet section of the nitrogen duct 2 is equipped with a second electric valve 5. The first electric valve 4 is installed in the first half of the nitrogen duct 2 and is located between the first gas pressure detection sensor 3 and the connection point of the nitrogen duct 2. The gas buffer device 6 is installed in the second half of the nitrogen duct 2 and is located between the connection point of the nitrogen duct 2 and the second gas pressure detection sensor 7.

[0013] This invention connects the nitrogen pipeline 2 to the middle section of the instrument air duct. The nitrogen pipeline 2 and the first half of the instrument air duct 1 form a parallel pipeline system. The nitrogen pipeline 2 is equipped with a first electric valve 4. The first air pressure detection sensor 3 monitors the air pressure value of the inlet section of the instrument air duct 1. When the gas pressure here is lower than the set lower limit, the first electric valve 4 is opened to supplement nitrogen. The second air pressure detection sensor 7 measures the air pressure value of the outlet section of the instrument air duct 1. This air pressure value must meet the working air pressure requirements. When the first air pressure detection sensor 3 detects that the air pressure value of the inlet section of the instrument air duct 1 has recovered to the set upper limit, the first electric valve 4 is automatically closed. When the first air pressure detection sensor 3 detects that the air pressure value of the inlet section of the instrument air duct 1 is too high, the intake air volume can be controlled by the second electric valve 5.

[0014] In order to make the gas pressure output from the outlet section of the instrument air duct 1 more stable, the instrument air duct 1 is equipped with a gas buffer device 6.

[0015] like Figure 2 As shown, the gas buffer device 6 includes a housing 8, an air inlet pipe 11 located on the left side of the housing 8 and communicating with the inside of the housing 8, an air outlet pipe 12 located on the right side of the housing 8 and communicating with the inside of the housing 8, and a first buffer baffle 9 and a second buffer baffle 10 located in the left half of the housing 8. The first buffer baffle 9 extends obliquely to the upper right from the bottom surface of the housing 8 and is connected to the bottom surface and the front and rear sides of the housing 8. A gap is left between the first buffer baffle 9 and the top surface of the housing 8. The second buffer baffle 10 extends obliquely to the lower right from the top surface of the housing 8 and is connected to the top surface and the front and rear sides of the housing 8. A gap is left between the second buffer baffle 10 and the bottom surface of the housing 8.

[0016] During operation, gas enters the housing 8 through the inlet pipe 11, first acting on the first buffer baffle 9 for primary buffering, then passing through the gap between the first buffer baffle 9 and the top surface of the housing 8, and acting on the second buffer baffle 10 for secondary buffering. After that, the gas passes through the gap between the second buffer baffle 10 and the bottom surface of the housing 8 and enters the right half of the housing 8, and is then discharged through the outlet pipe 12, outputting the gas with stable pressure to the side-blown furnace.

[0017] Finally, it should be noted that the above content is only used to illustrate the technical solution of this utility model, and is not intended to limit the scope of protection of this utility model. Simple modifications or equivalent substitutions made by those skilled in the art to the technical solution of this utility model do not depart from the essence and scope of the technical solution of this utility model.

Claims

1. A parallel instrument air duct for a side-blown furnace, comprising an instrument air duct and a nitrogen duct, characterized in that: The instrument air duct is equipped with a first air pressure sensor at its inlet section and a second air pressure sensor at its outlet section. The middle section of the instrument air duct is connected to the nitrogen pipeline. The outlet section of the nitrogen pipeline is equipped with a second electric valve. The first electric valve is located between the first air pressure sensor and the connection point of the nitrogen pipeline in the first half of the nitrogen pipeline. The gas buffer device is located between the connection point of the nitrogen pipeline and the second air pressure sensor in the second half of the nitrogen pipeline.

2. The parallel instrument air duct of the side-blown furnace according to claim 1, characterized in that: The gas buffer device includes a housing, an air inlet pipe located on the left side of the housing and communicating with the inside of the housing, an air outlet pipe located on the right side of the housing and communicating with the inside of the housing, and a first buffer baffle and a second buffer baffle located in the left half of the housing. The first buffer baffle extends obliquely to the upper right from the bottom surface of the housing and is connected to the bottom surface and the front and rear sides of the housing. A gap is left between the first buffer baffle and the top surface of the housing. The second buffer baffle extends obliquely to the lower right from the top surface of the housing and is connected to the top surface and the front and rear sides of the housing. A gap is left between the second buffer baffle and the bottom surface of the housing.

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