CN214937584U - Blast furnace top pressure-equalizing gas purification and recovery device - Google Patents
Blast furnace top pressure-equalizing gas purification and recovery device Download PDFInfo
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- CN214937584U CN214937584U CN202120709385.4U CN202120709385U CN214937584U CN 214937584 U CN214937584 U CN 214937584U CN 202120709385 U CN202120709385 U CN 202120709385U CN 214937584 U CN214937584 U CN 214937584U
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Abstract
The utility model discloses a pressure-equalizing gas purification and recovery device at the top of a blast furnace. The device comprises an intermediate buffer tank and a cyclone dust collector which are arranged between a furnace top charging bucket and a flow path of a blast furnace clean gas main pipe, and further comprises a pressure-equalizing gas recovery pipe, a pressure-equalizing gas outlet main pipe and a gas transmission and distribution pipeline, wherein a regulating valve is arranged on the pressure-equalizing gas outlet main pipe, the upper end part of the intermediate buffer tank is provided with a spraying mechanism for cooling, depressurizing and primary dedusting, and the lower part of the intermediate buffer tank is connected with a drain pipe. The pressure-equalizing gas purification and recovery device has good adaptability, and can use dry or wet dust removal; the device can recover most of the coal gas diffused from the top of the blast furnace, solves the problem of environmental pollution caused by the pressure-equalizing coal gas of the blast furnace, saves the production and operation cost, and solves the problem of impact of pressure fluctuation on a clean coal gas main pipe of the blast furnace when the pressure-equalizing coal gas is connected to a grid.
Description
Technical Field
The utility model relates to the technical field of iron-making blast furnace production, in particular to a blast furnace top pressure-equalizing gas purification and recovery device.
Background
The coal gas discharged for a long time along with the normal production of blast furnace ironmaking comprises two parts: one part is gas discharged from the charging bucket during top charging, which is called pressure equalizing gas, and the other part is gas discharged from the top of the blast furnace through chemical reaction of raw fuel in the blast furnace, which is called top gas. When the blast furnace stops production and stops air supply due to special reasons, the coal gas discharged from the top of the blast furnace is called large-emission coal gas.
Top pressure equalizing gas, which is necessary for blast furnace production and is a toxic, combustible mixture gas containing a large amount of carbon monoxide, carbon dioxide and dust, has been conventionally released into the atmosphere before each charging. The diffused gas seriously pollutes the atmospheric environment, and meanwhile, the noise is high in the discharging process, so that people are disturbed day and night. In recent years, with the improvement of energy conservation and emission reduction requirements, how to effectively and stably recover blast furnace top pressure-equalizing gas becomes a problem to be solved urgently.
With the proposition of the concepts of circular economy and sustainable development, the environmental protection problem of the blast furnace is increasingly emphasized, the recovery of the pressure-equalizing coal gas can not only fundamentally solve the problems of environmental pollution, noise disturbing residents and the like caused by diffusion, but also improve the energy utilization rate. The construction of the furnace top pressure-equalizing gas recovery facility can recover the engineering investment cost within a short period, and has better economic and social benefits.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is to provide a blast furnace roof voltage-sharing gas purification recovery unit, also reduce the pollution to the environment when reducing the rate of diffusing of voltage-sharing gas, also need guarantee simultaneously that voltage-sharing gas can be stable incorporate into in the blast furnace clean gas main.
The utility model discloses a solve the technical scheme who above-mentioned technical problem took and be:
the pressure-equalizing gas purification and recovery device for the top of the blast furnace is characterized by comprising an intermediate buffer tank and a dust remover, wherein the intermediate buffer tank is connected with a top charging bucket of the top of the blast furnace through a pressure-equalizing gas recovery pipe, a gas valve is arranged on the pressure-equalizing gas recovery pipe, the intermediate buffer tank is connected with the dust remover through a pressure-equalizing gas outlet header pipe, the dust remover is communicated with a blast furnace clean gas header pipe through a gas transmission and distribution pipeline, a gas flow detector is arranged on the gas transmission and distribution pipeline, and regulating valves for regulating and controlling gas flow are arranged on flow paths of the intermediate buffer tank and the gas flow detector and are respectively interlocked with signals established between the gas valve and the gas flow detector.
According to the requirement of upstream ironmaking production process, when the furnace top charging bucket is opened for 5 seconds, the pressure of the pressure-equalizing gas is reduced to 50kPa from 0.25MPa, a pressure-equalizing gas recovery pipe with enough large volume and an intermediate buffer tank are arranged between the furnace top charging bucket and the dust remover to store the pressure-equalizing gas so as to deal with the impact caused by instant release of a large amount of pressure-equalizing gas; when in use, the middle buffer tank is used for buffering the pressure-equalizing gas, the low-pressure vertical storage tank or the horizontal storage tank can be selected according to the actual engineering conditions, wherein the horizontal storage tank can also adopt a large-size gas main pipe, and the structure and the model of the middle buffer tank are not limited. The regulating valve is respectively interlocked with the gas valve and the gas flow detector through establishing signals, so that the pressure-equalizing gas can be smoothly carried out in a recovery stage and a slow release stage, data on the gas flow detector can be fed back to the regulating valve, the flow of the pressure-equalizing gas at the outlet of the dust remover can be ensured within a reasonable range according to the size of the regulating valve, and the phenomenon that the flow fluctuation is too large, the pressure of the pressure-equalizing gas is too large when the grid connection is carried out, and the pressure of a clean gas main pipe of the blast furnace is influenced is avoided.
Preferably, the pressure equalizing gas outlet main pipe is formed by connecting a plurality of gas pipelines, and the pipe diameters of the plurality of gas pipelines are sequentially reduced along the gas flowing direction.
The pipe diameters of the pressure-equalizing gas outlet header pipes are sequentially reduced, so that when pressure-equalizing gas flows through, the pipe diameters are reduced, the gas flow speed can be increased, the collision and accumulation probability of dust and liquid drops can be increased, and the purification efficiency of the pressure-equalizing gas is improved; the gas transmission and distribution pipeline can also adopt multi-section pipeline connection, and the design that the pipe diameters of the pipelines are reduced in sequence can also improve the purification efficiency of the pressure-equalizing gas.
Preferably, the regulating valve is arranged on the pressure equalizing gas outlet main pipe.
Preferably, the regulating valve is arranged on a gas transmission pipeline.
The adjusting valve is arranged between the middle buffer tank and the gas flow detector, the adjusting valve can regulate and control the flow when the pressure-sharing gas flows through according to the data of the gas flow detector, the adjusting gas can be arranged on the pressure-sharing gas outlet header pipe or a gas transmission pipeline, the optimal mode is that the adjusting valve is arranged on the pressure-sharing gas outlet header pipe, the adjusting valve not only plays a role in regulating and controlling the pressure, but also has a better practical effect on the dust remover.
Preferably, a temperature detector and a pressure detector are arranged on the intermediate buffer tank, and signal interlocking is established between the pressure detector and the regulating valve.
Preferably, the middle buffer tank is further connected with a spraying mechanism, the spraying mechanism comprises a fluid pipeline extending into the middle buffer tank, a flow regulating valve is arranged on the fluid pipeline, a plurality of downward atomizing nozzles are arranged on the fluid pipeline in the middle buffer tank, and the sum of the spraying areas of the atomizing nozzles is larger than the cross section of the middle buffer tank.
The temperature of the pressure-sharing gas when coming out of the furnace top charging bucket is 150-250 ℃, the temperature and the high pressure are high, the instant impact is large, the pressure-sharing gas recovery pipe is connected with the lower part of the middle buffer tank, the pressure-sharing gas outlet header pipe is connected with the top end of the middle buffer tank, the pressure-sharing gas enters from the lower part of the middle buffer tank and flows upwards, the upper end of the middle buffer tank is provided with a downward atomizing nozzle which is in reverse contact with the pressure-sharing gas, cooling water or other solutions are sprayed out after atomization, the temperature of the pressure-sharing gas is further reduced to 55-65 ℃ in the process of contacting with the pressure-sharing gas, the pressure-sharing gas pressure in the middle buffer tank is continuously reduced, and after liquid drop infiltration, part of large dust in the pressure-sharing gas is deposited downwards and discharged under the action of gravity, smaller dust particles and liquid drops continue to flow downwards along with the pressure-sharing gas, the pressure-sharing gas is cooled through the middle buffer tank, After being soaked, the mixture continuously and stably enters a dust remover, and then is dewatered and dedusted under the action of high-speed rotating centrifugal force.
The signal interlock between the pressure detector on governing valve and the middle buffer tank can guarantee going on smoothly of voltage-sharing coal gas recovery stage and slow-release stage to when the slow-release stage is close, the pressure in the middle buffer tank falls to normal within range.
Preferably, signal interlock is established between the temperature detector and the flow regulating valve.
The temperature that the temperature detector shows is directly proportional with flow control valve's aperture, and when the temperature in the middle buffer tank was high, flow control valve opened to the biggest, carries out cooling depressurization treatment to the voltage-sharing coal gas, and when the temperature dropped to 55 ~ 65 ℃, flow control valve's aperture also closed gradually, and the next voltage-sharing coal gas retrieves the stage, repeats the process of cooling the voltage-sharing coal gas.
Preferably, the bottom of the middle buffer tank is further connected with a drain pipe adopting a U-shaped water seal drainage mode, the drain pipe is provided with an electric drain valve, the tail end of the drain pipe is provided with a wastewater disposal basin, and the drain pipe is further provided with an access hole.
Middle buffer tank erodees the voltage-sharing coal gas that gets into, plays the effect of the first dust removal of cooling step down, and the waste liquid can gather in the bottom of middle buffer tank, and solid waste deposit is in the bottom, and the upper strata is the clear liquid, can pass through circulating pump and fluid pipeline with the clear liquid on upper strata and be connected, can realize the used repeatedly of cooling water or solution, and resources are saved is different according to the impurity of voltage-sharing coal gas, can wash voltage-sharing coal gas with different solution, carries out the edulcoration.
Preferably, the lower part of the dust remover is provided with a cleaning mechanism, the bottom end of the dust remover is connected with a dust discharging pipe comprising a dust discharging valve, and the tail end of the dust discharging pipe is provided with a slurry collecting pool.
The gas dust removal can adopt a dry process or a wet process, the dust remover can be a bag dust remover, a cyclone dust remover, a pulse dust remover and the like, and the cyclone dust remover is preferably selected, so that the dust removal effect is good due to the high cost performance of the cyclone dust remover.
The dust removal efficiency of the dust remover is more than 80-85%, the pressure-equalizing gas can be effectively purified, the dust stored in the lower part of the dust remover is considered to be absorbed, deliquesced and blocked on the lower part or the inner wall of the dust remover, a cleaning mechanism can be arranged on the lower part of the dust remover, the cleaning mechanism can be of a chain or steel wire rope structure and can be used for cleaning under the action of air flow, a rotary scraper or an air hammer or a flat vibrator structure can also be used for cleaning under the action of external force, and the cleaning mechanism is a device commonly used on the dust remover, is not shown in the figure and is not limited to the structure.
The utility model discloses owing to adopt above technical scheme, make it compare with prior art, have following beneficial effect:
1) the middle buffer tank with enough volume is arranged, the pressure-equalizing coal gas in the furnace top material tank can be efficiently recovered in a short time, and the dispersion amount is reduced as low as possible;
2) the recycled pressure-equalizing coal gas is subjected to primary dust removal in the middle buffer pipe, and then is subjected to dust removal and impurity removal in the dust remover, so that the dust content of the purified pressure-equalizing coal gas is ensured to be within an allowable range, and the purified pressure-equalizing coal gas can be safely merged into a clean coal gas main pipe of the blast furnace;
3) the furnace top pressure equalizing gas has the characteristics of high pressure, short recovery time, large instant impact and the like, and the gas flow detector interlocked with the signal of the regulating valve is arranged on the gas transmission and distribution pipeline, so that the flow of the pressure equalizing gas at the outlet of the dust remover can be ensured to be in a normal range, and the excessive pressure fluctuation caused by the excessive flow fluctuation when the pressure equalizing gas is connected to the grid is avoided, and the pressure fluctuation is controlled to be in the normal range.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
1-furnace top charging bucket; 2-blast furnace clean gas main pipe; 3-pressure equalizing gas recovery pipe; 4-intermediate buffer tank; 5-pressure equalizing gas outlet main pipe; 6-a dust remover; 7-gas transmission and distribution pipelines; 8-a gas valve; 9-adjusting the valve; 10-gas flow detector; 11-temperature detector; 12-a pressure detector; 13-a fluid conduit; 14-a flow regulating valve; 15-an atomizing spray head; 16-a drain pipe; 17-an electric drain valve; 18-a wastewater basin; 19-access hole; 20-an ash discharge valve; 21-ash discharging pipe; 22-mud collection tank.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, rather than all embodiments, and all other embodiments obtained by a person of ordinary skill in the art without creative work belong to the protection scope of the present invention based on the embodiments of the present invention. In the drawings, the size and relative sizes of certain features may be exaggerated for clarity.
In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected" and "connected" are to be construed broadly, e.g., as meaning a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; the term "connected" refers to a connection between two elements or an interaction between two elements, and the term is used in the present invention to be understood as a specific meaning for those skilled in the art.
In the description of the present invention, the terms "upper", "lower", "left", "right", "front", "back", and the like are used in the orientation or positional relationship shown in the drawings for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and therefore should not be construed as limiting the present invention.
As shown in the attached figure 1 of the specification, the invention provides a blast furnace top pressure-equalizing gas purification and recovery device, which comprises a pressure-equalizing gas recovery pipe 3, an intermediate buffer tank 4, a pressure-equalizing gas outlet header pipe 5, a dust remover 6 and a gas transmission and distribution pipeline 7, wherein the pressure-equalizing gas is communicated with a furnace top charging bucket 1 and a blast furnace clean gas header pipe 2, the pressure-equalizing gas is discharged from the furnace top charging bucket 1, sequentially treated by the purification and recovery device and then is merged into the blast furnace clean gas header pipe 2 to complete a recovery period, the pressure-equalizing gas recovery pipe 3 is connected with the lower end part of the intermediate buffer tank 4, the gas transmission and distribution pipeline 7 is connected with the top part of the dust remover 6, a gas valve 8 is arranged on the pressure-equalizing gas recovery pipe 3, an adjusting valve 9 is arranged on the pressure-equalizing gas outlet main pipe 5, a gas flow detector 10 is arranged on the gas transmission and distribution pipeline 7, and a temperature detector 11 and a pressure detector 12 are arranged on the intermediate buffer tank 4; the regulating valve 9 is respectively interlocked with the gas valve 8, the gas flow detector 10 and the pressure detector 12 to ensure that the pressure equalizing gas recovery stage and the slow release stage are smoothly carried out, and the pressure when the pressure equalizing gas is purified and then is merged into the blast furnace clean gas main pipe is in a normal range.
Middle buffer tank 4 still is connected with sprays the mechanism, spray the mechanism including extending to fluid pipeline 13 in middle buffer tank 4, be provided with flow control valve 14 on the fluid pipeline 13, be provided with a plurality of atomizer 15 down on the fluid pipeline 13 of middle buffer tank 4 upper end, its spray area is greater than middle buffer tank 4's cross section, middle buffer tank 4's sub-unit connection has drain pipe 16, drain pipe 16 adopts U type water seal drainage mode, be provided with electronic drain valve 17 on the drain pipe 16, the end of drain pipe 16 is provided with wastewater disposal basin 18, still be provided with access hole 19 on the drain pipe 16.
In a further optimized implementation mode, the pressure-equalizing gas outlet header pipe 5 is formed by connecting a plurality of gas pipelines, and the pipe diameters of the plurality of gas pipelines are sequentially reduced along the gas flowing direction.
And signal interlocking is established between the temperature detector 11 and the flow regulating valve 14, and the temperature of the sprayed liquid is reduced according to the temperature in the intermediate buffer tank 4, so that the method is more accurate and quicker.
The lower part of the dust remover 6 is provided with a cleaning mechanism, the bottom end of the cleaning mechanism is connected with a lower ash pipe 21 comprising an ash discharge valve 20, and the tail end of the lower ash pipe 21 is provided with a slurry collecting pool 22.
The working principle is that when the recovery period of the pressure-equalizing gas begins, a gas valve 8 is opened, a regulating valve 9 is closed, the pressure-equalizing gas in a furnace top charging bucket 1 flows into an intermediate buffer tank under the action of pressure difference, the temperature of the pressure-equalizing gas when the pressure-equalizing gas is discharged from the furnace top charging bucket is 150-250 ℃, when the pressure-equalizing gas enters the intermediate buffer tank, the flow regulating valve is opened to the maximum, cooling water or other solution is sprayed to cool and depressurize the pressure-equalizing gas and primarily remove dust, when the pressure in the furnace top charging bucket is reduced to 50kPa, the pressure in the intermediate buffer tank is 40-50 kPa, the gas valve 8 is closed, the regulating valve 9 is opened, the temperature of the pressure-equalizing gas is continuously reduced to 55-65 ℃, the pressure-equalizing gas flows downstream under the action of the pressure difference, after dust is removed by a dust remover 6, the gas is merged into a blast furnace clean gas main pipe 2 by a gas pipeline 7, a gas flow detector 10 interlocked with the regulating valve 9 is arranged on the gas pipeline 7, the accessible regulation and control governing valve 9 keeps the pressure-sharing gas flow when being incorporated into the power networks in normal range, avoids because flow fluctuation is too big, and the pressure fluctuation is too big when leading to being incorporated into the power networks, causes the influence to blast furnace clean gas house steward 2, and the pressure constant value of blast furnace clean gas house steward 2 is 12kPa, and when the pressure in the middle buffer tank was close to the pressure of blast furnace clean gas house steward 2, the slow-release stage ended, and governing valve 9 closed, got into next pressure-sharing gas and retrieved the cycle.
And those not described in detail in this specification are well within the skill of those in the art.
It will be appreciated by those skilled in the art that the invention can be embodied in many other specific forms without departing from the spirit or scope of the invention. Although the embodiments of the present invention have been described, it is to be understood that the present invention should not be limited to such embodiments, and that changes and modifications can be made by one skilled in the art within the spirit and scope of the present invention as defined by the appended claims.
Claims (9)
1. The pressure-equalizing gas purification and recovery device for the top of the blast furnace is characterized by comprising an intermediate buffer tank and a dust remover, wherein the intermediate buffer tank is connected with a top charging bucket of the top of the blast furnace through a pressure-equalizing gas recovery pipe, a gas valve is arranged on the pressure-equalizing gas recovery pipe, the intermediate buffer tank is connected with the dust remover through a pressure-equalizing gas outlet header pipe, the dust remover is communicated with a blast furnace clean gas header pipe through a gas transmission and distribution pipeline, a gas flow detector is arranged on the gas transmission and distribution pipeline, and regulating valves for regulating and controlling gas flow are arranged on flow paths of the intermediate buffer tank and the gas flow detector and are respectively interlocked with signals established between the gas valve and the gas flow detector.
2. The blast furnace top pressure equalizing gas purifying and recovering device according to claim 1, wherein said pressure equalizing gas outlet header pipe is formed by connecting a plurality of gas pipes, and the pipe diameters of said plurality of gas pipes decrease in sequence in a gas flowing direction.
3. The blast furnace top pressure equalizing gas purification and recovery device according to claim 1, wherein the regulating valve is disposed on the pressure equalizing gas outlet header pipe.
4. The blast furnace top pressure equalizing gas purification and recovery device according to claim 1, wherein said regulating valve is provided on a gas transmission line.
5. The blast furnace top pressure equalizing gas purification and recovery device according to claim 1, wherein a temperature detector and a pressure detector are arranged on the intermediate buffer tank, and signal interlocking is established between the pressure detector and the regulating valve.
6. The blast furnace top pressure equalizing gas purification and recovery device according to claim 5, wherein the intermediate buffer tank is further connected with a spraying mechanism, the spraying mechanism comprises a fluid pipeline extending into the intermediate buffer tank, a flow regulating valve is arranged on the fluid pipeline, a plurality of downward atomizing nozzles are arranged on the fluid pipeline in the intermediate buffer tank, and the sum of the spraying areas of the atomizing nozzles is larger than the cross section of the intermediate buffer tank.
7. The blast furnace top pressure equalizing gas purification and recovery device according to claim 6, wherein the temperature detector and the flow regulating valve are interlocked by signals.
8. The blast furnace top pressure-equalizing gas purification and recovery device as claimed in claim 6, wherein a drain pipe adopting a U-shaped water seal drainage mode is further connected to the bottom of the intermediate buffer tank, an electric drain valve is arranged on the drain pipe, a wastewater disposal basin is arranged at the tail end of the drain pipe, and an access hole is further arranged on the drain pipe.
9. The blast furnace top pressure equalizing gas purification and recovery device according to claim 1, wherein a cleaning mechanism is arranged at the lower part of the dust remover, a dust discharging pipe comprising a dust discharging valve is connected to the bottom end of the dust remover, and a slurry collecting tank is arranged at the tail end of the dust discharging pipe.
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| CN202120709385.4U CN214937584U (en) | 2021-04-08 | 2021-04-08 | Blast furnace top pressure-equalizing gas purification and recovery device |
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| CN202120709385.4U CN214937584U (en) | 2021-04-08 | 2021-04-08 | Blast furnace top pressure-equalizing gas purification and recovery device |
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| CN214937584U true CN214937584U (en) | 2021-11-30 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112941259A (en) * | 2021-04-08 | 2021-06-11 | 中冶南方工程技术有限公司 | Blast furnace top pressure-equalizing gas purification and recovery device and process |
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- 2021-04-08 CN CN202120709385.4U patent/CN214937584U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112941259A (en) * | 2021-04-08 | 2021-06-11 | 中冶南方工程技术有限公司 | Blast furnace top pressure-equalizing gas purification and recovery device and process |
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