A kind of anti-blocking type closed ore-heat furnace pressure taking device

Abstract

The present invention discloses a blocking-proof closed ore-heating furnace pressure taking device. The device comprises a blocking-proof pressure taking box, a solenoid valve group, and a pressure transmitter. The blocking-proof pressure taking box is composed of an electrostatic precipitation orifice plate, a bracket, a pressure taking hole pipe, and a pressure equalizing chamber cover. The electrostatic precipitation orifice plate is welded on the bracket, the bracket is welded on the cover of the pressure equalizing chamber cover, the pressure taking hole pipe is inserted into the inside of the pressure equalizing chamber cover and welded to the top of the pressure equalizing chamber cover, the blocking-proof pressure taking box is connected to the solenoid valve group through a conduit, the solenoid valve group is connected to the pressure transmitter through a conduit, the solenoid valve group is connected to the control cabinet through a wire, and the blocking-proof pressure taking box is welded on the furnace cover of the closed ore-heating furnace. The present invention has a dust adsorption and sedimentation function, solves the problem of blockage of the pressure taking pipe for measuring the furnace pressure of the ore-heating furnace, has an N2 cleaning function, and can ensure continuous measurement of the furnace pressure.

Description

Technical Field

[0001] The invention relates to an anti-blocking type closed ore-heating furnace pressure taking device, wherein the ore-heating furnace includes a ferroalloy furnace, a calcium carbide furnace, etc., and is a pressure taking device for measuring the gas pressure in a closed ore-heating furnace in the metallurgical industry. Background Art

[0002] Submerged arc furnace is a kind of industrial electric furnace which operates continuously. It is mainly used for reducing and smelting ores, producing ferrosilicon, ferromanganese, ferrochrome, silicon-manganese alloy and other ferroalloys as raw materials for smelting alloy steel, and can also produce chemical raw materials such as calcium carbide.

[0003] When a submerged arc furnace is closed for smelting, coal gas will inevitably be produced, mainly in the form of flammable and explosive CO gas. The coal gas has a high dust concentration and a temperature of up to 800°C. The dust particles are extremely fine and very sticky, especially the dust carries static electricity and the adhesion phenomenon is very serious.

[0004] In order to ensure the safety of smelting production in an electric arc furnace, the furnace pressure must be accurately controlled within the range of +20 to 30 Pa.

[0005] In order to obtain the pressure inside the furnace, the current common practice is to drill a hole on the furnace cover and then weld a pressure-taking steel pipe of about DN30mm to sense the pressure inside the furnace and its changes. However, due to the stickiness of dust and the electrostatic effect, the pressure-taking pipe is frequently blocked and cannot truly reflect the pressure and changes inside the furnace, resulting in frequent smoke from the furnace door in front of the furnace and CO poisoning incidents occurring from time to time, seriously affecting production and safety. Therefore, in order to achieve precise control of the furnace pressure of a closed ore-fired furnace, the problem of blockage of the pressure-taking pipe must be solved first to eliminate safety hazards. Summary of the invention

[0006] In order to solve the problem of blockage of the pressure taking pipe existing in the background technology, the present invention provides an anti-blocking type closed ore-fired furnace pressure taking device.

[0007] The technical solution of the present invention is: a blocking-proof closed ore-heating furnace pressure taking device, including a blocking-proof pressure taking box, a solenoid valve group, and a pressure transmitter. The blocking-proof pressure taking box is composed of an electrostatic precipitation orifice plate, a bracket, a pressure taking hole tube, and a pressure equalizing chamber cover. The electrostatic precipitation orifice plate is welded to the bracket, the bracket is welded to the cover opening of the pressure equalizing chamber cover, the pressure taking hole tube is inserted into the interior of the pressure equalizing chamber cover and welded to the top of the pressure equalizing chamber cover, the blocking-proof pressure taking box is connected to the solenoid valve group through a conduit, the solenoid valve group is connected to the pressure transmitter through a conduit, the solenoid valve group is connected to the control cabinet through a wire, the blocking-proof pressure taking box is welded on the furnace cover of the closed ore-heating furnace, and the pressure transmitter monitors the pressure in the furnace in real time and outputs a pressure signal.

[0008] According to an embodiment of the present invention, the electrostatic precipitation orifice plate is a metal porous plate, and the pressure equalization chamber cover is a metal round box.

[0009] According to an embodiment of the present invention, the pressure-taking hole tube is a metal porous tube, the lower end of which is open, and the upper part is trumpet-shaped and connected to a conduit.

[0010] According to an embodiment of the present invention, two circular holes are opened on the furnace cover of the closed submerged arc furnace, and anti-blocking pressure-taking boxes are respectively welded at the positions of the two openings.

[0011] According to an embodiment of the present invention, the solenoid valve group includes a first solenoid valve, a second solenoid valve, a third solenoid valve, and a fourth solenoid valve.

[0012] According to an embodiment of the present invention, the solenoid valve group is connected to the nitrogen tank through a conduit.

[0013] According to the embodiment of the present invention, the control cabinet issues instructions to the No. 1 solenoid valve, No. 2 solenoid valve, No. 3 solenoid valve and No. 4 solenoid valve of the solenoid valve group. During normal operation, the No. 1 solenoid valve and No. 2 solenoid valve are opened, and the No. 3 solenoid valve and No. 4 solenoid valve are closed. After the device has worked for a certain period of time, the control cabinet switches the solenoid valve group, the No. 1 solenoid valve is opened, the No. 2 solenoid valve is closed, the No. 3 solenoid valve is closed, and the No. 4 solenoid valve is opened, and the anti-blocking pressure box N on the right is turned on. 2 Cleaning, and so on, the control cabinet issues a rotation cleaning command, and then the left anti-blocking pressure box N 2 Clean up.

[0014] The electrostatic precipitation orifice plate can not only precipitate dust with static electricity, but also play a role in filtering and equalizing pressure; the pressure taking hole tube can sense the average pressure in all directions; the gas pressure field in the inner cavity of the pressure equalizing chamber cover is relatively uniform and stable, and can truly reflect the pressure in the furnace.

[0015] The solenoid valve group composed of four solenoid valves can realize that the pressure sensor always continuously measures the furnace pressure by controlling the opening and closing schemes of different solenoid valves, that is, at least one anti-blocking pressure taking box is guaranteed to be working, and the other anti-blocking pressure taking box is N 2 Sweep and vice versa.

[0016] The pressure transmitter can convert the pressure signal into an electrical signal and output it for the smelting process automatic control system to adjust the fan suction force, thereby controlling the furnace pressure.

[0017] The working principle of the present invention is: when the anti-blocking pressure-taking box is working, the gas pressure and its fluctuation signal in the furnace can be collected, transmitted to the pressure transmitter through the conduit, and then converted into an electrical signal for output; when the charged dust in the gas diffuses, it can be adsorbed and settled on the electrostatic precipitation orifice plate due to the viscosity and electrostatic effects, avoiding its entry into the conduit and clogging, and at the same time, the electrostatic precipitation orifice plate also plays a filtering and pressure-equalizing role; when the device is working normally (solenoid valve No. 1 is open, solenoid valve No. 2 is open, solenoid valve No. 3 is closed, and solenoid valve No. 4 is closed), the pressure transmitter reflects the average pressure of the two anti-blocking pressure-taking boxes. After the device has been working for a certain period of time, the control cabinet issues a command to switch two of the solenoid valves (solenoid valve No. 1 is open, solenoid valve No. 2 is closed, solenoid valve No. 3 is closed, and solenoid valve No. 4 is open), and the anti-blocking pressure-taking box N on the right is switched. 2 Cleaning, similarly, the control cabinet issues a rotation cleaning command, and then the left anti-blocking pressure box N 2 During cleaning, only one of the anti-blocking pressure taking boxes is allowed to be N 2 Clean, so that the device can always continuously measure the furnace pressure.

[0018] The beneficial technical effects of the present invention are: the device has the function of dust adsorption and sedimentation, solves the problem of blockage of the pressure measuring and taking pipe of the ore-fired furnace, and has N 2 The cleaning function can ensure continuous measurement of furnace pressure. The device has a simple structure and is easy to manufacture and install. It is suitable for real-time and accurate monitoring of gas pressure in closed ore-fired furnaces. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The present invention is a diagram of the structure of a pressure taking device for a closed ore-fired furnace with an anti-blocking type.

[0020] Figure 2 This is the front view of the anti-blocking pressure box.

[0021] Figure 3 This is a top view of the anti-blocking pressure box.

[0022] In the figure: 1-anti-blocking pressure box; 2-solenoid valve group; 3-pressure transmitter; 4-nitrogen tank; 5-conduit; 6-control cabinet; 101-electrostatic precipitation orifice plate; 102-bracket; 103-pressure taking hole tube; 104-pressure equalizing chamber cover; 201-solenoid valve No. 1; 202-solenoid valve No. 2; 203-solenoid valve No. 3; 204-solenoid valve No. 4. DETAILED DESCRIPTION

[0023] The present invention will be further described below in conjunction with the accompanying drawings.

[0024] The specific implementation plan of this embodiment is as follows.

[0025] like Figure 2As shown, two anti-blocking pressure-taking boxes 1 are manufactured. The electrostatic precipitation orifice plate 101 is welded to the bracket 102, and the bracket 102 is welded to the cover of the pressure equalizing chamber cover 104, and the pressure-taking orifice tube 103 is inserted into the pressure equalizing chamber cover 104 and welded to the top of the pressure equalizing chamber cover 104.

[0026] Two circular holes are opened at two positions on the cover of the ore-fired furnace, and anti-blocking pressure-taking boxes 1 are welded at the opening positions.

[0027] Press Figure 1 As shown in the connection relationship, the anti-blocking pressure box 1, the solenoid valve group 2, the pressure transmitter 3, and the nitrogen tank 4 are connected by a conduit 5, and the control cabinet 6 is connected to the solenoid valve No. 1 201, the solenoid valve No. 202, the solenoid valve No. 3 203, and the solenoid valve No. 4 204 respectively by wires.

[0028] The control cabinet 6 issues a command, the No. 1 solenoid valve 201 opens, the No. 2 solenoid valve 202 opens, the No. 3 solenoid valve 203 closes, and the No. 4 solenoid valve 204 closes, and the device starts to work normally. The pressure transmitter 3 monitors the pressure in the furnace in real time and outputs a pressure signal.

[0029] According to the set control program, the control cabinet 6 issues a timed cleaning command to switch two of the solenoid valves, that is, the No. 1 solenoid valve 201 is opened, the No. 2 solenoid valve 202 is closed, the No. 3 solenoid valve 203 is closed, and the No. 4 solenoid valve 204 is opened, and the right anti-blocking pressure box 1N 2 After cleaning, the anti-blocking pressure taking box 1 on the left still works normally, and the device can always measure the furnace pressure continuously. 2 Clean up.

[0030] The device was successfully applied in the Jilin ferroalloy electric furnace gas dry purification project with ideal results.

[0031] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A closed anti-blocking furnace pressure taking device, characterized in that The invention comprises an anti-blocking pressure-taking box (1), an electromagnetic valve group (2), and a pressure transmitter (3); the anti-blocking pressure-taking box (1) is composed of an electrostatic precipitation orifice plate (101), a bracket (102), a pressure-taking orifice tube (103), and a pressure equalizing chamber cover (104); the electrostatic precipitation orifice plate (101) is welded to the bracket (102); the bracket (102) is welded to the cover opening of the pressure equalizing chamber cover (104); the pressure-taking orifice tube (103) is inserted into the interior of the pressure equalizing chamber cover (104) and welded to the top of the pressure equalizing chamber cover (104); the anti-blocking pressure-taking box (1) is connected to the electromagnetic valve group (2) via a conduit (5); and the electromagnetic valve group (2) is connected to the pressure equalizing chamber cover (104) via a conduit (5). The electromagnetic valve group (2) is connected to a control cabinet (6) via a wire; the anti-blocking pressure-taking box (1) is welded on the furnace cover of the closed ore-heating furnace; the pressure transmitter (3) monitors the pressure in the furnace in real time and outputs a pressure signal; two circular holes are opened on the furnace cover of the closed ore-heating furnace, and the anti-blocking pressure-taking boxes (1) are welded at the positions of the two openings respectively; the electromagnetic valve group (2) is connected to a nitrogen tank (4) via a conduit (5); the electromagnetic valve group (2) comprises a No. 1 electromagnetic valve (201), a No. 2 electromagnetic valve (202), a No. 3 electromagnetic valve (203), and a No. 4 electromagnetic valve (204); the pressure transmitter (3) The first solenoid valve (201), the third solenoid valve (203), and the nitrogen tank (4) are connected in sequence through the conduit (5); the pressure transmitter (3) is connected in sequence to the second solenoid valve (202), the fourth solenoid valve (204), and the nitrogen tank (4) through the conduit (5); the connecting conduit (5) between the first solenoid valve (201) and the third solenoid valve (203) is connected to the anti-blocking pressure taking box (1); the connecting conduit (5) between the second solenoid valve (202) and the fourth solenoid valve (204) is connected to the anti-blocking pressure taking box (1); the control cabinet (6) is connected to the first solenoid valve (201) and the second solenoid valve (202) of the solenoid valve group (2) , the No. 3 solenoid valve (203), and the No. 4 solenoid valve (204) issue instructions. During normal operation, the No. 1 solenoid valve (201) and the No. 2 solenoid valve (202) are opened, and the No. 3 solenoid valve (203) and the No. 4 solenoid valve (204) are closed. After the device has been operating for a certain period of time, the control cabinet (6) switches the solenoid valve group (2), the No. 1 solenoid valve (201) is opened, the No. 2 solenoid valve (202) is closed, the No. 3 solenoid valve (203) is closed, and the No. 4 solenoid valve (204) is opened, and the right anti-blocking pressure taking box (1) N2 is cleaned. Similarly, the control cabinet (6) issues a rotation cleaning instruction, and then the left anti-blocking pressure taking box (1) N2 is cleaned.

2. The anti-blocking type closed ore-arc furnace pressure taking device according to claim 1 is characterized in that The electrostatic precipitation orifice plate (101) is a metal porous plate, and the pressure equalization chamber cover (104) is a metal round box.

3. The anti-blocking type closed ore-arcing furnace pressure taking device according to claim 1 is characterized in that The pressure-taking hole tube (103) is a metal porous tube, the lower end of which is open, and the upper part of which is trumpet-shaped and connected to the conduit (5).

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