Calcium carbide furnace flue system with quenching function

Abstract

The present application relates to the technical field of calcium carbide furnace flue, and discloses a calcium carbide furnace flue system with quenching function, which comprises a calcium carbide furnace, a first settling bin, a second settling bin, a third settling bin, a bag-type dust collector, a clean gas fan and a rough gas fan, and a flue gas pipeline is fixedly connected between the outlet of the calcium carbide furnace and the inlet of the first settling bin. The present application has reasonable and compact structure, small investment, great effect, convenient installation, and the flue gas in the fourth pipeline enters the flue gas pipeline through the quenching main pipe and the quenching branch pipe, so that the temperature of the flue gas in the flue gas pipeline can be reduced, the temperature of the flue gas in the flue gas pipeline can be reduced to below 600 degrees in the running process, meanwhile, the flue gas in the quenching main pipe can accelerate the flow rate of the high-temperature flue gas in the flue gas pipeline, so that the scaling phenomenon of the flue gas in the flue gas pipeline is fundamentally solved, the downtime of the calcium carbide furnace is reduced, the safety risk in cleaning the flue gas pipeline is avoided, and the influence of scaling in the flue gas pipeline on the equipment is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of calcium carbide furnace flue, and is a calcium carbide furnace flue system with quenching function. BACKGROUND

[0002] The calcium carbide production process is a process of generating calcium carbide by using lime and carbon material as raw materials, relying on electric arc heat and resistance heat at a high temperature of 1900-2200 DEG C in a calcium carbide furnace. The high-temperature coal gas generated in the production of calcium carbide carries part of the powder (carbon material, lime) into the flue. The flue is provided with a circulating water cooling jacket to cool the high-temperature coal gas, and the cooled coal gas enters the purification system. Due to the high temperature (1900-2200 DEG C) of the reaction area of the calcium carbide furnace, the high temperature of the coal gas, and the melting of the carbon material and lime powder carried, the flue is scaled and blocked. Once the flue is scaled, the heat exchange between the circulating water and the flue gas will be blocked, and the scaling trend is irreversible. After a period of accumulation, the work needs to be stopped for treatment. The scaling of the flue has the following hazards.

[0003] Firstly, the scaling of the flue has an impact on the operation of the calcium carbide furnace: the calcium carbide furnace is stopped. The scaling of the flue will cause the flue diameter to become smaller, affecting the normal flow of the coal gas, and in severe cases, the calcium carbide furnace will not be able to normally transport the coal gas to the purification system, and the calcium carbide furnace needs to be stopped for cleaning the flue. Each calcium carbide furnace is cleaned once a month due to the scaling of the flue, and is stopped for 8 hours. Taking a conventional calcium carbide furnace in the industry as an example, the loss caused by the single flue cleaning is more than 200,000 yuan.

[0004] Secondly, the scaling of the flue has an impact on the operation of the equipment: the scaling of the flue reduces the heat exchange capacity of the flue, the temperature of the coal gas is high, and the flue, flue valve, bag in the bag house and ash / ash conveying equipment are burned. The burning of the above equipment and facilities may cause coal gas leakage, flue leakage and other high-risk events, and further cause coal gas fire, explosion and other serious safety incidents. At the same time, the high temperature reduces the service life of the equipment, increasing the equipment maintenance and replacement cost.

[0005] Finally, the cleaning of the flue scaling is a high-risk operation: the cleaning of the flue scaling involves climbing operation, hoisting operation, confined space operation and other high-risk special operations. A large number of maintenance personnel participate in the cleaning of the flue scaling in a short time, and the personnel are exposed to the operation risk, which may cause personal injury events.

[0006] Limited to the existing calcium carbide furnace and flue design of calcium carbide industry, flue scaling cannot be avoided, which is an industry problem that has plagued calcium carbide production. The current calcium carbide industry existing flue scaling control methods are: first, reduce the calcium carbide furnace charge surface temperature, strictly require electrode lowering, the high temperature reaction zone (hot zone) of the calcium carbide furnace is at the bottom, the high temperature coal gas is generated after heat exchange through the upper carbon material, the temperature entering the flue will be relatively low, but still cannot be reduced to below 700 degrees. And the electrode lowering depth cannot be guaranteed during calcium carbide production, the temperature in the flue is kept above 900 degrees for a long time; second, increase nitrogen back blowing and knockers in the flue, nitrogen back blowing and knockers can remove the relatively loose scaling in the back blowing and knocking area, but cannot clean the entire flue and hard scaling; third, try to stabilize the calcium carbide furnace operating pressure, maintain a slight positive pressure. Slow down the high temperature caused by the negative pressure of the calcium carbide furnace, air entering the flue system combustion, and slow down the speed of flue scaling. This measure can only very limitedly delay flue scaling, but cannot stop flue scaling from occurring.

[0007] The above measures can only slow down the speed of flue scaling, and cannot effectively solve the problem of flue scaling. The calcium carbide production industry urgently needs a technological innovation to completely solve the industry problem of flue scaling. SUMMARY

[0008] The present application provides a calcium carbide furnace flue system with quenching function, which overcomes the shortcomings of the prior art and effectively solves the problem of easy scaling of the existing calcium carbide furnace flue.

[0009] The technical scheme of the present application is realized by the following measures: a calcium carbide furnace flue system with quenching function, comprising a calcium carbide furnace, a first settling bin, a second settling bin, a third settling bin, a bag dust collector, a clean gas fan and a coarse gas fan, a flue gas pipeline is fixedly connected between the outlet of the calcium carbide furnace and the inlet of the first settling bin, a first pipeline is fixedly connected between the outlet of the first settling bin and the inlet of the second settling bin, a second pipeline is fixedly connected between the outlet of the second settling bin and the inlet of the coarse gas fan, a third pipeline is fixedly connected between the outlet of the coarse gas fan and the inlet of the third settling bin, a fourth pipeline is fixedly connected between the outlet of the third settling bin and the inlet of the clean gas fan, a fifth pipeline is fixedly connected between the outlet of the clean gas fan and the inlet of the bag dust collector, further comprising a quenching main pipe, a quenching branch pipe and a collector pipe sleeved outside the flue gas pipeline, a plurality of quenching branch pipes are circumferentially distributed between the outside of the flue gas pipeline corresponding to the right position of the collector pipe and the right side of the collector pipe, the upper end of the lowermost quenching branch pipe is inclined backward relative to the lower end, and the total cross-sectional area of all quenching branch pipes is less than the cross-sectional area of the quenching main pipe.

[0010] The following is a further optimization or / and improvement of the above-mentioned technical scheme of the invention:

[0011] The chilling main pipe can be provided with a first regulating valve, a second regulating valve is installed on the chilling main pipe corresponding to the position between the first regulating valve and the collecting pipe, and a differential pressure flowmeter is installed on the chilling main pipe corresponding to the position between the first regulating valve and the second regulating valve.

[0012] The chilling main pipe corresponding to the position between the second regulating valve and the collecting pipe can be provided with a first stop valve, a first connecting short pipe is fixedly communicated with the chilling main pipe corresponding to the position between the first stop valve and the second regulating valve, and a second stop valve is installed on the first connecting short pipe.

[0013] The chilling main pipe corresponding to the position between the first connecting short pipe and the second regulating valve can be provided with a first expansion short section.

[0014] The chilling main pipe corresponding to the position between the first regulating valve and the fourth pipe can be provided with a third stop valve, a second connecting short pipe is fixedly communicated with the chilling main pipe corresponding to the position between the third stop valve and the first regulating valve, and a fourth stop valve is installed on the second connecting short pipe.

[0015] The chilling main pipe corresponding to the position between the second connecting short pipe and the first regulating valve can be provided with a second expansion short section.

[0016] The total cross-sectional area of all the chilling branch pipes is less than the cross-sectional area of the chilling main pipe.

[0017] The present application has reasonable and compact structure, small investment, great effect, convenient installation, the flue gas in the fourth pipe enters the flue gas pipe through the chilling main pipe and the chilling branch pipe, the temperature of the flue gas in the flue gas pipe can be reduced, the temperature of the flue gas in the flue gas pipe can be reduced to below 600 degrees during operation, at the same time, the flue gas in the chilling main pipe can accelerate the flow rate of the high-temperature flue gas in the flue gas pipe, fundamentally solving the scaling phenomenon of the flue gas in the flue gas pipe, reducing the downtime of the calcium carbide furnace, avoiding the safety risk during cleaning of the flue gas pipe, and reducing the impact of scaling in the flue gas pipe on the equipment. BRIEF DESCRIPTION OF DRAWINGS

[0018] FIG. 1 is a schematic view of the front structure of the embodiment one. Figure 1 FIG. 1 is a schematic view of the front structure of the embodiment one.

[0019] FIG. 1 is a schematic view of the front structure of the embodiment one. Figure 2 FIG. 1 is a schematic view of the front structure of the embodiment one.

[0020] FIG. 1 is a schematic view of the front structure of the embodiment one. Figure 3 FIG. 1 is a schematic view of the front structure of the embodiment one.

[0021] FIG. 1 is a schematic view of the front structure of the embodiment one. Figure 4 FIG. 1 is a schematic view of the front structure of the embodiment one.

[0022] FIG. 1 is a schematic view of the front structure of the embodiment one.Figure 5 Figure 1 is a schematic diagram of the three-dimensional structure of the connection between the quenching branch pipe and the flue gas pipe in Example 1.

[0023] The codes in the drawings are as follows: 1 is a calcium carbide furnace, 2 is a first settling bin, 3 is a second settling bin, 4 is a third settling bin, 5 is a bag-type dust collector, 6 is a clean gas fan, 7 is a flue gas pipe, 8 is a first pipe, 9 is a second pipe, 10 is a third pipe, 11 is a fourth pipe, 12 is a quenching main pipe, 13 is a quenching branch pipe, 14 is a collecting pipe, 15 is a first regulating valve, 16 is a second regulating valve, 17 is a differential pressure flowmeter, 18 is a first stop valve, 19 is a second stop valve, 20 is a first expansion short section, 21 is a third stop valve, 22 is a fourth stop valve, 23 is a second expansion short section, 24 is a first connecting short pipe, 25 is a second connecting short pipe, 26 is a coarse gas fan, and 27 is a fifth pipe. DETAILED DESCRIPTION

[0024] The present application is not limited by the following examples, and the specific implementation manners can be determined according to the technical solutions of the present application and the actual situation.

[0025] In the present application, the relative position relationship of each component is described according to the layout of the drawings attached to the specification, for example, the position relationship of front, back, top, bottom, left, right, etc. is determined according to the layout direction of the drawings attached to the specification. Figure 1

[0026] The present application is further described below in combination with examples and drawings:

[0027] Example 1: as shown in Figure 1, the quenching branch pipe 13 is connected to the flue gas pipe 7 through the first connecting short pipe 24, the second connecting short pipe 25, the first regulating valve 15, the second regulating valve 16, the differential pressure flowmeter 17, the first stop valve 18, the second stop valve 19, the first expansion short section 20, the third stop valve 21, the fourth stop valve 22, the second expansion short section 23, the first pipe 8, the second pipe 9, the third pipe 10, the fourth pipe 11, the quenching main pipe 12, and the collecting pipe 14. Figures 1 to 5 ​As shown, the calcium carbide furnace flue system with quenching function comprises a calcium carbide furnace 1, a first settling bin 2, a second settling bin 3, a third settling bin 4, a bag-type dust collector 5, a clean gas fan 6 and a coarse gas fan 26, a flue gas pipeline 7 fixedly communicated between the outlet of the calcium carbide furnace 1 and the inlet of the first settling bin 2, a first pipeline 8 fixedly communicated between the outlet of the first settling bin 2 and the inlet of the second settling bin 3, a second pipeline 9 fixedly communicated between the outlet of the second settling bin 3 and the inlet of the coarse gas fan 26, a third pipeline 10 fixedly communicated between the outlet of the coarse gas fan 26 and the inlet of the third settling bin 4, a fourth pipeline 11 fixedly communicated between the outlet of the third settling bin 4 and the inlet of the clean gas fan 6, a fifth pipeline 27 fixedly communicated between the outlet of the clean gas fan 6 and the inlet of the bag-type dust collector 5, further comprising a quenching main pipe 12, quenching branch pipes 13 and a collecting pipe 14 sleeved outside the flue gas pipeline 7, a plurality of quenching branch pipes 13 are circumferentially and interval distributed between the outside of the flue gas pipeline 7 and the right side of the collecting pipe 14 corresponding to the right position of the collecting pipe 14, the upper end of the lowermost quenching branch pipe 13 is inclined backward relative to the lower end, the quenching main pipe 12 is fixedly communicated between the collecting pipe 14 and the fifth pipeline 27, and the total cross-sectional area of all the quenching branch pipes 13 is smaller than the cross-sectional area of the quenching main pipe 12.

[0028] According to the requirement, the center axis of each quenching branch pipe 13 and the center axis of the flue gas pipe 7 are provided with an included angle, the specification of the quenching main pipe 12 is DN300, the specification of the quenching branch pipe 13 is DN100, the number of the quenching branch pipe 13 is 3 or 4, the collecting pipe 14 is circular ring or C-shaped with both ends closed, a plurality of quenching branch pipes 13 are distributed along the circumference between the outer side of the flue gas pipe 7 corresponding to the right position of the collecting pipe 14 and the right side of the collecting pipe 14, the upper end of the lowermost quenching branch pipe 13 is inclined backward relative to the lower end, that is, the upper end of the lowermost quenching branch pipe 13 is inclined to the right rear relative to the lower end, and the quenching branch pipes 13 at other positions are the same as the lowermost quenching branch pipe 13 and are distributed along the circumference. In the use process, through such setting, the flue gas in the fifth pipe 27 enters the flue gas pipe 7 through the quenching main pipe 12 and the quenching branch pipe 13, which can reduce the temperature of the coal gas in the flue gas pipe 7, and the temperature of the coal gas in the flue gas pipe 7 can be reduced to below 600 degrees in the operation process. The upper end of the lowermost quenching branch pipe 13 is inclined backward relative to the lower end, that is, the upper end of the lowermost quenching branch pipe 13 is inclined to the right rear relative to the lower end, so that the flue gas in the flue gas pipe 7 can form a cyclone, which can improve the flow rate of the high-temperature coal gas in the flue gas pipe 7, fundamentally solve the scaling phenomenon of the coal gas in the flue gas pipe 7, reduce the downtime of the calcium carbide furnace 1, avoid the safety risk when cleaning the flue gas pipe 7, reduce the influence of scaling in the flue gas pipe 7 on the equipment, the total cross-sectional area of all quenching branch pipes 13 is less than the cross-sectional area of the quenching main pipe 12, which can improve the flow rate of the flue gas entering the flue gas pipe 7 through the quenching branch pipe 13, make the flue gas pipe 7 smooth, reduce the resistance, the operating frequency of the existing clean gas fan 6 is 25Hz, so that only the operating frequency of the clean gas fan 6 needs to be improved, the gas at the outlet of the clean gas fan 6 can be used to cool the flue gas pipe 7, without replacing the clean gas fan 6 with larger specification, which can reduce the modification cost. The structure of the present application is reasonable and compact, the investment is small, the effect is large, and the installation is convenient.

[0029] According to the actual need, the above-mentioned calcium carbide furnace flue system with quenching function can be further optimized or / and improved:

[0030] Example two: as an optimization of the above-mentioned examples, as shown in the accompanying drawings Figure 1As shown, the quenching main pipe 12 is provided with a first regulating valve 15, the quenching main pipe 12 is provided with a second regulating valve 16 corresponding to the position between the first regulating valve 15 and the collecting pipe 14, and the quenching main pipe 12 is provided with a differential pressure flowmeter 17 corresponding to the position between the first regulating valve 15 and the second regulating valve 16. According to the requirement, the first regulating valve 15 and the second regulating valve 16 are interlocked with the clean air fan 6, and the first regulating valve 15 and the second regulating valve 16 are closed when the clean air fan 6 stops running. In use, the flue gas flow in the quenching main pipe 12 can be adjusted by setting the first regulating valve 15, the flue gas flow in the quenching main pipe 12 can be measured by setting the differential pressure flowmeter 17, the flue gas flow in the quenching main pipe 12 is adjusted by the first regulating valve 15 and the second regulating valve 16, thereby reducing the flue gas temperature in the flue gas pipeline 7, avoiding the fouling phenomenon in the flue gas pipeline 7, and facilitating the maintenance of the differential pressure flowmeter 17 by setting the second regulating valve 16.

[0031] Embodiment three: as an optimization of the above-mentioned embodiments, as shown in the accompanying drawings Figure 1 As shown, the quenching main pipe 12 is provided with a first regulating valve 15, the quenching main pipe 12 is provided with a second regulating valve 16 corresponding to the position between the first regulating valve 15 and the collecting pipe 14, and the quenching main pipe 12 is provided with a differential pressure flowmeter 17 corresponding to the position between the first regulating valve 15 and the second regulating valve 16. According to the requirement, the first regulating valve 15 and the second regulating valve 16 are interlocked with the clean air fan 6, and the first regulating valve 15 and the second regulating valve 16 are closed when the clean air fan 6 stops running. In use, the flue gas flow in the quenching main pipe 12 can be adjusted by setting the first regulating valve 15, the flue gas flow in the quenching main pipe 12 can be measured by setting the differential pressure flowmeter 17, the flue gas flow in the quenching main pipe 12 is adjusted by the first regulating valve 15 and the second regulating valve 16, thereby reducing the flue gas temperature in the flue gas pipeline 7, avoiding the fouling phenomenon in the flue gas pipeline 7, and facilitating the maintenance of the differential pressure flowmeter 17 by setting the second regulating valve 16.

[0032] Embodiment four: as an optimization of the above-mentioned embodiments, as shown in the accompanying drawings Figure 1 As shown, the quenching main pipe 12 is provided with a first regulating valve 15, the quenching main pipe 12 is provided with a second regulating valve 16 corresponding to the position between the first regulating valve 15 and the collecting pipe 14, and the quenching main pipe 12 is provided with a differential pressure flowmeter 17 corresponding to the position between the first regulating valve 15 and the second regulating valve 16. According to the requirement, the first regulating valve 15 and the second regulating valve 16 are interlocked with the clean air fan 6, and the first regulating valve 15 and the second regulating valve 16 are closed when the clean air fan 6 stops running. In use, the flue gas flow in the quenching main pipe 12 can be adjusted by setting the first regulating valve 15, the flue gas flow in the quenching main pipe 12 can be measured by setting the differential pressure flowmeter 17, the flue gas flow in the quenching main pipe 12 is adjusted by the first regulating valve 15 and the second regulating valve 16, thereby reducing the flue gas temperature in the flue gas pipeline 7, avoiding the fouling phenomenon in the flue gas pipeline 7, and facilitating the maintenance of the differential pressure flowmeter 17 by setting the second regulating valve 16.

[0033] Embodiment five: as an optimization of the above-mentioned embodiments, as shown in the accompanying drawings Figure 1As shown, the quenching main pipe 12 at the position corresponding to the first regulating valve 15 and the fourth pipe 11 is provided with a third stop valve 21, the quenching main pipe 12 at the position corresponding to the third stop valve 21 and the first regulating valve 15 is fixedly communicated with a second connecting short pipe 25, and the second connecting short pipe 25 is provided with a fourth stop valve 22. In use, the third stop valve 21 can be set to facilitate the maintenance and replacement of the regulating valve and the differential pressure flowmeter 17, and the fourth stop valve 22 can be set to shorten the emptying time of the high-temperature flue gas in the quenching main pipe 12 after the third stop valve 21 is closed, thereby facilitating the subsequent maintenance work.

[0034] Embodiment six: as an optimization of the above-mentioned embodiments, as shown in the accompanying drawings Figure 1 As shown, the quenching main pipe 12 at the position corresponding to the second connecting short pipe 25 and the first regulating valve 15 is provided with a second expansion joint 23. The second expansion joint 23 is a publicly known corrugated expansion joint, which can compensate for the thermal expansion of the quenching main pipe 12 caused by the high-temperature flue gas in the quenching main pipe 12, thereby avoiding the influence on the connection between the quenching main pipe 12 and the fourth pipe 11 when the quenching main pipe 12 is subjected to thermal expansion.

[0035] The above technical features constitute embodiments of the present application, which have strong adaptability and implementation effects. Non-essential technical features can be added or removed according to actual needs to meet the needs of different situations.

Claims

1. A flue gas system for a calcium carbide furnace with a quenching function, comprising a calcium carbide furnace, a first settling chamber, a second settling chamber, a third settling chamber, a bag filter, a clean air fan, and a coarse air fan; a flue gas duct is fixedly connected between the outlet of the calcium carbide furnace and the inlet of the first settling chamber; a first duct is fixedly connected between the outlet of the first settling chamber and the inlet of the second settling chamber; a second duct is fixedly connected between the outlet of the second settling chamber and the inlet of the coarse air fan; a third duct is fixedly connected between the outlet of the coarse air fan and the inlet of the third settling chamber; a fourth duct is fixedly connected between the outlet of the third settling chamber and the inlet of the clean air fan; and a fifth duct is fixedly connected between the outlet of the clean air fan and the inlet of the bag filter, characterized in that... It also includes a quench main pipe, quench branch pipes, and a manifold pipe fitted outside the flue gas duct. Several quench branch pipes are distributed circumferentially between the outside of the flue gas duct and the right side of the manifold pipe, corresponding to the position to the right of the manifold pipe. The upper end of the lowest quench branch pipe is inclined backward relative to the lower end. The quench main pipe is fixedly connected between the manifold pipe and the fifth pipe. The total cross-sectional area of ​​all quench branch pipes is less than the cross-sectional area of ​​the quench main pipe.

2. The calcium carbide furnace flue system with quenching function according to claim 1, characterized in that... A first regulating valve is installed on the quench main pipe, a second regulating valve is installed on the quench main pipe corresponding to the position between the first regulating valve and the manifold, and a differential pressure flow meter is installed on the quench main pipe corresponding to the position between the first regulating valve and the second regulating valve.

3. The calcium carbide furnace flue system with quenching function according to claim 2, characterized in that... A first shut-off valve is installed on the quench main pipe at the position between the second regulating valve and the manifold. A first connecting short pipe is fixedly connected to the quench main pipe at the position between the first shut-off valve and the second regulating valve. A second shut-off valve is installed on the first connecting short pipe.

4. The calcium carbide furnace flue system with quenching function according to claim 3, characterized in that... A first expansion joint is installed on the quench main pipe corresponding to the position between the first connecting short pipe and the second regulating valve.

5. The calcium carbide furnace flue system with quenching function according to claim 2, 3, or 4, characterized in that... A third shut-off valve is installed on the quench main pipe corresponding to the position between the first regulating valve and the fourth pipe. A second connecting short pipe is fixedly connected to the quench main pipe corresponding to the position between the third shut-off valve and the first regulating valve. A fourth shut-off valve is installed on the second connecting short pipe.

6. The calcium carbide furnace flue system with quenching function according to claim 5, characterized in that... A second expansion joint is installed on the quench main pipe corresponding to the position between the second connecting short pipe and the first regulating valve.

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