Submerged arc furnace flue gas treatment system

Abstract

The utility model discloses a submerged arc furnace flue gas treatment system which comprises a waste heat boiler and a dust remover which are sequentially connected through a flue gas pipe and a conveying pipe, the flue gas pipe is connected with a switching pipeline through a plurality of bent heat dissipation pipes, the switching pipeline is connected with the conveying pipe through a connecting pipe and a bypass pipe, the bottommost portions of the bent heat dissipation pipes are connected with an impurity conveying system, and the impurity conveying system is connected with a dust collector. The flue gas pipe of the submerged arc furnace is provided with the bent heat dissipation pipe for bypass heat dissipation, and the impurity conveying system is arranged at the lower part of the bent heat dissipation pipe, so that the temperature of flue gas entering the dust remover can be reduced, the normal operation of the dust remover is ensured, the problem of blockage of the bent heat dissipation pipe is solved, and the operation stability of the whole system is improved.

Description

Technical Field

[0001] The utility model relates to the field of submerged arc furnace flue gas treatment, in particular to a submerged arc furnace flue gas treatment system. Background Art

[0002] When producing ferrosilicon alloy, the submerged arc furnace generates high-temperature flue gas, which will flow along the flue gas pipe 2 into the waste heat boiler 3 for heat exchange cooling. The cooled flue gas will then flow into the dust collector 5 for dust removal. However, after the waste heat boiler 3 fails, the control valve 7 at the inlet and outlet of the waste heat boiler 3 is closed and switched out, and the control valve 7 on the bypass pipe 6 is opened. The high-temperature flue gas from the submerged arc furnace 1 will flow directly into the dust collector 5 through the bypass pipe 6, causing the temperature of the dust collector 5 to be high, affecting the normal operation of the dust collector 5 (e.g. Figure 3 shown). Utility Model Content

[0003] In order to solve the above-mentioned problems, the utility model provides a fume treatment system for a submerged arc furnace.

[0004] The utility model is realized through the following technical solutions:

[0005] A submerged arc furnace flue gas treatment system includes a waste heat boiler and a dust collector connected in sequence to the submerged arc furnace through a flue gas pipe and a conveying pipe. The flue gas pipe is connected to a switching pipe through multiple bent heat dissipation pipes. The switching pipe is connected to the conveying pipe through a connecting pipe and a bypass pipe. The bottom of the bent heat dissipation pipe is connected to an impurity conveying system.

[0006] Further optionally, the impurity conveying system includes an impurity pipe, the upper part of the impurity pipe is connected to the lowest bend of the corresponding bent heat dissipation pipe through multiple adsorption pipes, and the outlet of the impurity pipe is connected to the bypass pipe through the impurity discharge pipe.

[0007] Further optionally, a fan is connected and installed at the end of the impurity pipeline, and a shut-off valve is installed at the fan outlet.

[0008] Further optionally, the bottommost bend of the bent heat pipe is formed by connecting two left and right downwardly inclined sedimentation inclined pipes.

[0009] Further optionally, the adsorption tube inlet is connected and fixed to the center of the two sedimentation inclined tubes of the bent heat dissipation tube, and the adsorption tube is arranged obliquely along the impurity pipeline conveying direction.

[0010] Further optionally, control valves are installed on the inlet and outlet flue gas pipes and the delivery pipe of the waste heat boiler, and control valves are installed on the connecting pipe and the exhaust pipe.

[0011] Compared with the existing technology, the beneficial effect of the present invention is: by arranging a bent heat dissipation pipe for bypass heat dissipation in the flue gas pipe of the electric arc furnace and arranging an impurity conveying system at the lower part of the bent heat dissipation pipe, the present invention can not only reduce the temperature of the flue gas entering the dust collector and ensure the normal operation of the dust collector, but also solve the problem of blockage of the bent heat dissipation pipe and improve the stability of the operation of the entire system. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the utility model system;

[0013] Figure 2 It is a three-dimensional schematic diagram of the local structure of this utility model;

[0014] Figure 3 It is a schematic diagram of the prior art of this utility;

[0015] In the figure: submerged arc furnace 1, flue gas pipe 2, waste heat boiler 3, conveying pipe 4, dust collector 5, bypass pipe 6, control valve 7, bent heat dissipation pipe 8, switching pipe 9, settling inclined pipe 10, adsorption pipe 11, impurity pipe 12, fan 13, shut-off valve 14, connecting pipe 15, and impurity discharge pipe 16. DETAILED DESCRIPTION

[0016] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments:

[0017] like Figure 1 As shown, a flue gas treatment system for an ore-fired furnace comprises an ore-fired furnace 1, which is connected in sequence to a waste heat boiler 3 and a dust collector 5 through a flue gas pipe 2 and a conveying pipe 4. The flue gas pipe 2 is connected to a switching pipe 9 through a plurality of bent heat dissipation pipes 8. The bent heat dissipation pipes 8 are longitudinally arranged with two bent elbows at the top and bottom. The longer bent heat dissipation pipes 8 can dissipate heat from high-temperature flue gas and reduce its temperature. The switching pipe 9 is connected to the conveying pipe 4 through a connecting pipe 15 and a bypass pipe 6. The bottom of the bent heat dissipation pipes 8 is connected to an impurity conveying system.

[0018] like Figure 2 As shown, the impurity conveying system includes an impurity pipe 12 , the upper part of the impurity pipe 12 is connected to the lowest bend of the corresponding bent heat dissipation pipe 8 through multiple adsorption pipes 11 , and the outlet of the impurity pipe 12 is connected to the bypass pipe 6 through the impurity discharge pipe 16 .

[0019] like Figure 2 As shown, a fan 13 is connected to the end of the impurity pipe 12, and a shut-off valve 14 is installed at the outlet of the fan 13.

[0020] like Figure 2As shown, the bottom bend of the bent heat pipe 8 is connected by two left and right downwardly inclined sedimentation inclined tubes 10. The inclined sedimentation inclined tubes 10 will discharge the accumulated dust into the adsorption tube 11, and then enter the impurity pipe 12 along the adsorption tube 11 for buffering, which can extend the blockage time of the sedimentation inclined tube 10.

[0021] like Figure 2 As shown, the inlet of the adsorption tube 11 is connected and fixed to the center of the two sedimentation inclined tubes 10 of the bent heat dissipation tube 8. The adsorption tube 11 is inclined along the conveying direction of the impurity pipe 12. The air force in the inclined impurity pipe 12 is transported along it to produce a siphon effect, which will generate negative pressure inside the inclined adsorption tube 11 for adsorption, thereby adsorbing and conveying the dust accumulated inside the sedimentation inclined tube 10.

[0022] like Figure 1 As shown, control valves 7 are installed on the inlet and outlet flue gas pipes 2 and the delivery pipe 4 of the waste heat boiler 3, and control valves 7 are installed on the connecting pipe 15 and the exhaust pipe 16. Pipeline switching is achieved through multiple control valves 7, which facilitates the control and operation of the entire system.

[0023] The implementation principle of the fume treatment system of a submerged arc furnace in the embodiment of the present application is as follows:

[0024] When the waste heat boiler 3 fails and the control valves 7 of its inlet and outlet are closed, the control valve 7 on the connecting pipe 15 is opened, and the high-temperature flue gas generated by the submerged arc furnace 1 enters the flue gas pipe 2 and passes through the multiple connected bent heat dissipation pipes 8. Since the bent heat dissipation pipes 8 are bent multiple times, the heat dissipation area can be increased, thereby greatly reducing the temperature of the high-temperature flue gas. The flue gas cooled by the bent heat dissipation pipes 8 enters the switching pipe 9 and enters the dust collector 5 through the connecting pipe 15 and the bypass pipe 6 for dust removal. The cooled flue gas will not damage the dust collector 5, ensuring the normal operation of the dust collector 5.

[0025] When high-temperature flue gas passes through the bent heat dissipation pipe 8 for a long time, dust will settle at the lowest point. In order to avoid clogging of the bent heat dissipation pipe 8, it is necessary to open the fan 13, the shut-off valve 14 and the control valve 7 on the exhaust pipe 16 for a period of time (4-6 hours). The fan 13 delivers air with a certain pressure to the impurity pipe 12, and realizes the siphon effect through the inclined adsorption pipe 11 to generate negative pressure inside the adsorption pipe 11 and the sedimentation inclined pipe 10, and adsorbs the dust impurities gathered at the bottom of the sedimentation inclined pipe 10 at the lowest point of the bent heat dissipation pipe 8 into the impurity pipe 12, and then transports them to the inside of the dust collector 5 along the exhaust pipe 16 bypass pipe 6, so as to clear the dust blockage problem inside the bent heat dissipation pipe 8. After clearing the clogged dust impurities, the fan 13, the shut-off valve 14 and the control valve 7 of the exhaust pipe 16 can be closed.

[0026] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and improvements are intended to fall within the scope of the present invention. The scope of protection claimed in this invention is defined by the appended claims and their equivalents.

Claims

1. A submerged arc furnace flue gas treatment system, comprising a submerged arc furnace (1), a waste heat boiler (3) and a dust collector (5) connected in sequence via a flue gas pipe (2) and a delivery pipe (4), characterized in that: The flue gas pipe (2) is connected to the switching pipe (9) via a plurality of bent heat dissipation pipes (8); the switching pipe (9) is connected to the delivery pipe (4) via a connecting pipe (15) and a bypass pipe (6); and the bottom of the bent heat dissipation pipe (8) is connected to an impurity delivery system.

2. The submerged arc furnace flue gas treatment system according to claim 1, characterized in that: The impurity conveying system comprises an impurity pipe (12), the upper portion of the impurity pipe (12) is connected to the lowest bend of the corresponding bent heat dissipation pipe (8) through a plurality of adsorption pipes (11), and the outlet of the impurity pipe (12) is connected to the bypass pipe (6) through an impurity discharge pipe (16).

3. The submerged arc furnace flue gas treatment system according to claim 2, characterized in that: A fan (13) is connected and installed at the end of the impurity pipe (12), and a shut-off valve (14) is installed at the outlet of the fan (13).

4. The submerged arc furnace flue gas treatment system according to claim 2, characterized in that: The bottom bend of the bent heat dissipation pipe (8) is formed by connecting two left and right downwardly inclined sedimentation inclined pipes (10).

5. The submerged arc furnace flue gas treatment system according to claim 2, characterized in that: The inlet of the adsorption tube (11) is fixedly connected to the center of the two sedimentation inclined tubes (10) of the bent heat dissipation tube (8), and the adsorption tube (11) is arranged obliquely along the conveying direction of the impurity pipeline (12).

6. The submerged arc furnace flue gas treatment system according to claim 2, characterized in that: The inlet and outlet flue gas pipes (2) and the delivery pipe (4) of the waste heat boiler (3) are both equipped with control valves (7), and the connecting pipe (15) and the exhaust pipe (16) are both equipped with control valves (7).

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