CN114001555B - Partition plate type dust-settling temperature-regulating pressure-stabilizing flue gas pretreatment device and application process - Google Patents
Partition plate type dust-settling temperature-regulating pressure-stabilizing flue gas pretreatment device and application process Download PDFInfo
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- CN114001555B CN114001555B CN202111084055.1A CN202111084055A CN114001555B CN 114001555 B CN114001555 B CN 114001555B CN 202111084055 A CN202111084055 A CN 202111084055A CN 114001555 B CN114001555 B CN 114001555B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/001—Extraction of waste gases, collection of fumes and hoods used therefor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/008—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases cleaning gases
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D19/00—Arrangements of controlling devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D19/00—Arrangements of controlling devices
- F27D2019/0028—Regulation
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Abstract
The invention discloses a partition plate type dust-settling, temperature-regulating and pressure-stabilizing flue gas pretreatment device and an application process, and belongs to the field of metallurgical green production. The dust-settling, pressure-stabilizing and temperature-regulating dust-settling tank comprises a dust-settling, pressure-stabilizing and temperature-regulating tank body, a flue gas input pipe and a flue gas output pipe which are respectively provided with openings on the two side tank walls and fixedly connected with the openings, and a particle dust collecting hopper connected to the bottom of the dust-settling, pressure-stabilizing and temperature-regulating tank body; vertical fixedly connected with is from top to bottom two inside hollow gravity flow air heat exchange baffles of alternate distribution in the dust fall steady voltage temperature regulating box, is close to and reserves flue gas passageway towards the gravity flow air heat exchange baffle upper end of flue gas input tube, is close to and reserves flue gas passageway towards the gravity flow air heat exchange baffle bottom of flue gas output tube, can let the thick flue gas of production realize in the dust fall steady voltage temperature regulating box that "S" shape flows, increases the heat exchange distance of producing the interior indirect blending cold air of thick flue gas and dust fall steady voltage temperature regulating box. The invention ensures the stable pressure of the whole production system in large-scale sintering and pelletizing production.
Description
Technical Field
The invention relates to the technical field of metallurgical green production, in particular to a partition plate type dust-settling, temperature-regulating and pressure-stabilizing flue gas pretreatment device and an application process thereof.
Background
In the current large-scale sintering and pelletizing production, an induced draft combustion production process is usually adopted, and the flue gas generated by production combustion contains a large amount of metals, metal oxides and incompletely combusted fuel dust particles; and Hydrogen Chloride (HCL), sulfur Oxide (SOX), nitrogen Oxide (NOX), etc. produced by combustion; the highest temperature of the smoke is about 450 ℃, and the lowest temperature is about 80 ℃; various fluctuations in the production process are expressed as pressure fluctuation and temperature fluctuation of a production flue gas system.
With the continuous upgrade of the green production standard, the new standard requirements of national ultra-clean emission are as follows: the dust concentration is less than 10mg/Nm 3 NOx concentration less than 50mg/Nm 3 ,SO 2 The concentration is less than 35mg/Nm 3 . Therefore, the flue gas treatment is carried out by a single short-process electric dust removal (bag dust removal) device, and is upgraded into long-process electric dust removal (bag dust removal) + desulfurization + denitration + bag dust removal treatment.
When the flue gas system has large pressure and temperature fluctuation and large-particle metal dust enters the electric dust removal, the high-efficiency stable operation of the whole system is greatly influenced, and the flue gas dust removal with the dust concentration less than 10mg/Nm is difficult to complete 3 The target, more metal particle dirt also causes great wearing and tearing for main fan, other fan wheel and casing in the flue gas, and temperature fluctuation is more unfavorable for the steady operation of desulfurization + denitration, reduces the useless output of danger.
Through retrieval, the document with the Chinese patent application number of CN2017106384244 discloses a rotary hearth furnace zinc powder flue gas recovery pretreatment device and a pretreatment process thereof, and belongs to the technical field of rotary hearth furnace zinc powder recovery treatment. Comprises at least 2 rotary hearth furnace flue gas cooling and dust falling devices which are communicated in series through a dust-reducing flue gas eduction tube; the dust collecting device is communicated with the rotary hearth furnace flue gas cooling and dust falling device at the tail end through a final-stage dust reduction flue gas leading-out pipe; the smoke cooling mechanism is of a closed barrel-shaped structure, the zinc-containing dust smoke inlet pipe is communicated with the top of the barrel-shaped structure, and a downward extending dust baffle plate is fixed on the inner wall of the barrel-shaped structure; the dust-reduction flue gas outlet pipe is fixed on the upper side surface of the barrel-shaped structure; the bottom of the barrel-shaped structure is in a closing-up shape and is communicated with the dust-settling and ash-discharging pipe. The invention cools the flue gas by at least two stages of forced cooling mechanisms and air guide mechanisms which are relatively isolated, and removes dust by natural gravity and inertia, thereby achieving the purposes of recovering coarse zinc powder, cooling the flue gas to below 150 ℃ and ensuring the stability of the whole recovery process system. But the structure is complex and can not adapt to various application scenes of ultra-clean flue gas emission in metallurgical production.
Disclosure of Invention
1. Technical problems to be solved by the invention
Aiming at the defects that the pressure fluctuation and the temperature fluctuation of a flue gas production system are not beneficial to the stable operation of desulfurization and denitration in the large-scale sintering and pelletizing production in the prior art, the invention provides the partition plate type dust-settling temperature-regulating pressure-stabilizing flue gas pretreatment device and the application process.
2. Technical scheme
In order to achieve the purpose, the technical scheme provided by the invention is as follows:
the invention relates to a clapboard type dust-settling, temperature-regulating and pressure-stabilizing flue gas pretreatment device, which comprises a dust-settling, pressure-stabilizing and temperature-regulating tank body, a flue gas input pipe and a flue gas output pipe, wherein the flue gas input pipe and the flue gas output pipe are respectively provided with openings on the tank walls on two sides and are fixedly connected with each other; two self-flowing air heat exchange clapboards which are same in height and are alternately distributed up and down are vertically and fixedly connected in the dust-settling and pressure-stabilizing temperature-regulating box body, a flue gas channel is reserved at the upper end of the self-flowing air heat exchange clapboard close to and facing a flue gas input pipe, and a flue gas channel is reserved at the bottom end of the self-flowing air heat exchange clapboard close to and facing a flue gas output pipe, so that the produced crude flue gas can realize inverted S-shaped flow in the dust-settling and pressure-stabilizing temperature-regulating box body, and the heat exchange distance between the produced crude flue gas and the cold air indirectly blended in the dust-settling and pressure-stabilizing temperature-regulating box body is increased; the upper part of the self-flowing air heat exchange partition board is connected with a hot gas outlet pipe, the hot gas outlet pipe extends out of the dust-settling pressure-stabilizing temperature-regulating box body and then is communicated with the atmosphere, and the outer wall of the hot gas outlet pipe is fixedly connected to the top wall of the dust-settling pressure-stabilizing temperature-regulating box body; the two sides of the lower part of the self-flowing air heat exchange clapboard are respectively externally connected with an air inlet pipe, the air inlet pipes extend out of the dust-settling pressure-stabilizing temperature-regulating box body and then communicate the interior of the self-flowing air heat exchange clapboard with the atmosphere, the outer wall of the air inlet pipe is fixedly connected with the side wall of the dust-settling pressure-stabilizing temperature-regulating box body, cold air is added in the dust-settling pressure-stabilizing temperature-regulating box body, the direct cold air mixing amount is greatly reduced, strong disturbance of the cold air on smoke is avoided, the pressure of a smoke conveying pipeline is stabilized, the height of a smoke output pipe on a box wall is higher than that of a smoke input pipe, a flow channel of crude smoke from bottom to top is realized, the heat exchange process of the produced crude smoke and the cold air indirectly mixed in the dust-settling pressure-regulating box body when the smoke is pretreated between a production system and a conveying pipeline for smoke purification treatment is realized, the matching of the production system and a smoke purification system is fully cooperated, the pressure stability of the production system is ensured, the product quality is improved, the subsequent smoke purification treatment amount and the smoke emission amount is reduced, the fan load and the electricity consumption are reduced, and the mechanical crude smoke can be provided, the requirements of the dust-settling mechanical crude smoke, the dust-settling temperature, the requirements of the dust-settling temperature are met, and the requirements of different production processes, and the requirements of the various auxiliary systems are met.
Further, the gravity flow type air heat exchange partition plates are distributed in the dust falling, pressure stabilizing and temperature adjusting box body at equal intervals, so that the whole heat exchange process is uniformly connected, the violent exchange process is avoided, cold air is further prevented from generating strong disturbance on smoke, and the pressure of the smoke conveying pipeline is stabilized.
Furthermore, an adjustable air door is arranged at the pipe opening of the air inlet pipe, the size of the air door can be adjusted according to the temperature of the produced crude flue gas, and therefore the mixing amount of cold air in a room is adjusted.
Furthermore, the air door comprises a plurality of louver blades and an electric push rod, the louver blades are uniformly distributed from top to bottom, one end of each louver blade is rotatably connected with the left edge of the opening of the air inlet pipe through a pin shaft, the other end of each louver blade is rotatably connected with the right edge of the opening of the air inlet pipe through a pin shaft, the electric push rod is connected to the outer side surface of the opening of the air inlet pipe, a telescopic rod of the electric push rod is rotatably connected with one end of a rocker arm, and the other end of the rocker arm is connected with the pin shaft of the louver blades; the size of the mixing cold air volume of the adjusting room can be realized by controlling the electric push rod, manual on-site adjustment is not needed, and the automation and the convenience of operation are improved.
Furthermore, a W-shaped guide plate is connected between the front inner wall and the rear inner wall of the gravity flow type air heat exchange partition plate, so that the air can be prevented from generating circuitous disturbance in the dust fall pressure and temperature regulation box body, the flow velocity of the air is improved, meanwhile, the function of a reinforcing rib is achieved, and the mechanical strength of the dust fall pressure and temperature regulation box body is enhanced.
Furthermore, the front outer wall and the rear outer wall of the self-flowing air heat exchange partition are both connected with heat exchange fins, so that the heat exchange area for indirectly mixing cold air in the produced crude flue gas and the dust-settling pressure-stabilizing temperature-regulating box body is increased.
Furthermore, the heat exchange plates and the guide plates are uniformly distributed, so that the uniformity and the stability of heat exchange are further improved.
Furthermore, the two gravity flow air heat exchange clapboards are respectively a left clapboard and a right clapboard, wherein the top end of the left clapboard and the bottom end of the right clapboard are both fixedly connected with wear-resistant sleeves so as to prolong the service life of the clapboards; the bottom of the particle dust collecting hopper is connected with an ash discharge valve.
The application process of the clapboard type dust-settling, temperature-regulating and pressure-stabilizing flue gas pretreatment device is characterized in that after flue gas of a metallurgical production system enters a dust-settling, pressure-stabilizing and temperature-regulating box body through a flue gas input pipe, the flue gas is cooled by self-convection cold air in a self-flow air heat exchange clapboard, so that indirect cold air blending is realized.
In the further application process, when the temperature of the inlet flue gas is higher than the target temperature of the outlet, the adjustable air door on the left side is opened; when the temperature of the inlet flue gas is lower than the target temperature of the outlet, the adjustable air door on the left side is opened; when the temperature of the outlet flue gas is higher than the target temperature of the outlet, the adjustable air door on the right side is opened; when the outlet flue gas temperature is lower than the target temperature of the outlet, the adjustable air door on the right side is closed.
3. Advantageous effects
Compared with the prior art, the technical scheme provided by the invention has the following beneficial effects:
(1) The clapboard type dust-settling, temperature-regulating and pressure-stabilizing flue gas pretreatment device can be used for pretreating coarse flue gas of various scenes in metallurgical production and providing unpowered mechanical coarse flue gas dust-settling, temperature-reducing and pressure-stabilizing pretreatment for the coarse flue gas in metallurgical production, so that the operation stability of a long-flow flue gas system in sintering and ductile iron production is met, and the quality and the yield of sintered ore and pellet ore products are further improved; by cooperating with the respective characteristics of electric dust removal (bag-type dust removal), the optimized flue gas treatment system has optimal synergistic efficiency, unpowered indirect cold air introduction is performed to reduce the temperature of the flue gas, the stability of the system is increased, the load of a main fan is reduced, the discharge amount of the flue gas in process production is reduced, and meanwhile, large-particle dust of the crude flue gas can be recycled in advance, and the desulfurization and denitrification hazardous waste amount is reduced; the effects of ultra-clean exhaust of the flue gas and less regeneration hazardous waste are realized by cooperative work, and the method can be applied to various scenes of ultra-clean exhaust of the flue gas in production, environmental protection and the like;
(2) The clapboard type dust-settling temperature-regulating pressure-stabilizing flue gas pretreatment device has stable pressure in an indirect cold air dust removal mode, and reduces the load of a main fan; the temperature of the crude flue gas can be stably reduced to meet the requirement that the temperature of cloth bag dust removal is below 120 ℃; 5% -30% of dust particles can be recovered, the cloth bag (electric) dust removal efficiency is cooperatively improved, and the temperature of the stable crude flue gas meets the smoke outlet requirement of 150 +/-5 ℃ of efficient cooperative operation of an electric bag dust removal, desulfurization and denitrification system;
(3) The partition plate type dust-fall temperature-regulation and pressure-regulation flue gas pretreatment device overcomes the defect that flue gas of the whole metallurgical production system is completely mixed with cold air into a pipeline to reduce the temperature of the flue gas, the flue gas is pretreated between the production system and a conveying pipeline for flue gas purification treatment, the temperature of the flue gas is regulated by utilizing natural atmosphere, the mixed cold air is increased, the direct cold air mixing amount is greatly reduced, strong disturbance of the cold air on the flue gas is avoided, the pressure of the flue gas conveying pipeline is stabilized, the matching of the production system and the flue gas purification system is fully cooperated, the pressure stability of the production system is ensured, the product quality is improved, the subsequent flue gas purification treatment amount and the flue gas discharge amount are reduced, and the load and the power consumption of a fan are reduced. The whole production is further ensured, the production cost is saved, and the production efficiency is improved;
(4) According to the partition plate type dust fall, temperature and pressure regulating and stabilizing flue gas pretreatment device, the guide plates are arranged in a W shape, so that disturbance of atmosphere in the dust fall, pressure and temperature regulating box body can be prevented, the flow velocity of the atmosphere is improved, and meanwhile, the mechanical strength of the dust fall, pressure and temperature regulating box body is enhanced; the heat exchange fins are arranged to facilitate the flue gas to fully exchange heat with the dust-settling, pressure-stabilizing and temperature-regulating box body;
(5) The invention relates to an application process of a clapboard type dust-settling, temperature-regulating and pressure-stabilizing flue gas pretreatment device, wherein a dust-settling, pressure-stabilizing and temperature-regulating box body is subjected to heat exchange of flue gas, and the atmosphere in the dust-settling, pressure-stabilizing and temperature-regulating box body is heated to form a typical chimney effect.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic view of the partial cross-sectional structure of FIG. 1;
FIG. 3 isbase:Sub>A schematic sectional view A-A of FIG. 1;
FIG. 4 is a schematic view of the partial cross-sectional structure of FIG. 3;
FIG. 5 is a schematic view of the flow of flue gas in the present invention;
fig. 6 is a schematic view of the flow of atmospheric air in the present invention.
The reference numerals in the schematic drawings illustrate: 1. a flue gas input pipe; 3. a gravity flow air heat exchange baffle; 4. a wear-resistant sleeve; 5. a hot gas delivery pipe; 7. a flue gas output pipe; 11. a dust-settling pressure-stabilizing temperature-regulating box body; 12. a particle dust collecting hopper; 23. an air inlet pipe; 24. an adjustable air door; 25. a heat exchanger fin; 26. a baffle; 241. louver blades; 242. an electric push rod; 243. a telescopic rod.
Detailed Description
For a further understanding of the invention, reference should be made to the following detailed description taken in conjunction with the accompanying drawings.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
The present invention will be further described with reference to the following examples.
Example 1
As shown in fig. 1, the partition type dust-settling, temperature-regulating and pressure-stabilizing flue gas pretreatment device of the embodiment comprises a dust-settling, pressure-stabilizing and temperature-regulating tank body 11, a flue gas input pipe 1 and a flue gas output pipe 7 which are respectively provided with openings on two side tank walls and fixedly connected with the tank walls, and a particle dust collecting hopper 12 connected to the bottom of the dust-settling, pressure-stabilizing and temperature-regulating tank body 11; two self-flowing air heat exchange clapboards 3 which are same in height and are alternately distributed up and down are vertically and fixedly connected in the dust-settling and pressure-stabilizing temperature-regulating box body 11, a flue gas channel is reserved at the upper ends of the self-flowing air heat exchange clapboards 3 which are close to and face the flue gas input pipe 1, and a flue gas channel is reserved at the bottom ends of the self-flowing air heat exchange clapboards 3 which are close to and face the flue gas output pipe 7, so that the produced crude flue gas can realize inverted S-shaped flow in the dust-settling and pressure-stabilizing temperature-regulating box body 11, and the heat exchange distance between the produced crude flue gas and the cold air indirectly blended in the dust-settling and pressure-stabilizing temperature-regulating box body is increased; the upper part of the gravity flow type air heat exchange partition plate 3 is connected with a hot gas outlet pipe 5, the hot gas outlet pipe 5 extends out of the dust fall pressure stabilization and temperature regulation box body 11 and then is communicated with the atmosphere, and the outer wall of the hot gas outlet pipe 5 is fixedly connected to the top wall of the dust fall pressure stabilization and temperature regulation box body 11; the two sides of the lower part of the self-flowing air heat exchange partition plate 3 are respectively externally connected with an air inlet pipe 23, the air inlet pipe 23 extends out of the dust-settling pressure-stabilizing temperature-regulating box body 11 and then communicates the inside of the self-flowing air heat exchange partition plate 3 with the atmosphere, and the outer wall of the air inlet pipe 23 is fixedly connected to the side wall of the dust-settling pressure-stabilizing temperature-regulating box body 11.
The clapboard type dust-settling, temperature-regulating and pressure-stabilizing flue gas pretreatment device is applied to a sintering production scene, crude flue gas generated by sintering is pretreated in the clapboard type dust-settling, temperature-regulating and pressure-stabilizing flue gas pretreatment device, cold air is added in a dust-settling, pressure-regulating and temperature-stabilizing box body, the direct cold air blending amount is greatly reduced, strong disturbance of the cold air to the flue gas is avoided, the pressure of a flue gas conveying pipeline is stabilized, the height of a flue gas output pipe on a box wall is higher than that of a flue gas input pipe, a flowing channel of the produced crude flue gas from bottom to top is realized, the heat exchange process of indirectly blending cold air in the produced crude flue gas and the dust-settling, pressure-regulating and temperature-stabilizing box body is realized when the flue gas is pretreated between a production system and a flue gas purification conveying pipeline, the matching of the production system and a flue gas purification system is fully cooperated, the pressure stability of the whole production system is ensured, the product quality is improved, the subsequent flue gas purification treatment amount and the flue gas emission amount are reduced, the fan load and the electricity consumption are reduced, and unpowered mechanical crude flue gas is provided.
In this embodimentThe pretreatment device can synchronously complete three functions of dust fall, temperature stabilization and pressure stabilization, and adopts automatic control and regulation to cooperatively meet the long-flow process requirements of ultra-clean discharge electric dust removal, desulfurization and denitration, namely, the dust concentration after electric dust removal is 30mg/Nm 3 The pressure of the flue gas pressure satisfies the range of-14.5 to-15.5 KPa, and the temperature of the flue gas satisfies the range of 145 to 155 ℃.
In the pretreatment device of the embodiment, the dust collected by the particle dust collecting hopper 12 can be returned to the sintering batching for recycling by the extended closed dust chain plate conveyor;
the pretreatment device of this embodiment, the configuration about combining original flue gas input pipe 1 in scene and flue gas output tube 7 adopts 2 grades of gravity flow formula air heat exchange baffle 3 to realize that 3 times of turning to of flue gas can collect about 50% of granule dust with the variable speed.
Example 2
The baffle-type dust fall temperature-regulating and pressure-stabilizing flue gas pretreatment device of the embodiment is basically the same as embodiment 1, and further, the self-flowing air heat exchange baffle 3 is distributed in the dust fall pressure-stabilizing and temperature-regulating box at equal intervals, so that the whole heat exchange process is uniformly handed over, the violent exchange process is avoided, cold air is further avoided from generating strong disturbance to flue gas, and the pressure of a flue gas conveying pipeline is stabilized. As shown in fig. 2, the orifice of the air inlet pipe 23 is provided with an adjustable air door 24, which can adjust the size of the air door according to the temperature of the crude flue gas, thereby adjusting the amount of cool air mixed in the room. The air door 24 comprises a plurality of louver blades 241 and electric push rods 242, the louver blades 241 are uniformly distributed from top to bottom, one end of each louver blade 241 is rotatably connected with the left edge of the opening of the air inlet pipe 23 through a pin shaft, the other end of each louver blade 241 is rotatably connected with the right edge of the opening of the air inlet pipe 23 through a pin shaft, each electric push rod 242 is connected to the outer side surface of the opening of the air inlet pipe 23, an expansion rod 243 of each electric push rod is rotatably connected with one end of a rocker arm, and the other end of each rocker arm is connected with the pin shaft of each louver blade 241; the size of the mixing cold air volume of the adjusting room can be realized by controlling the electric push rod, manual on-site adjustment is not needed, and the automation and the convenience of operation are improved.
The pretreatment device of the embodiment adopts an air self-convection heat exchange structure for the self-flow air heat exchange partition plate 3, and clean hot air after heat exchange is directly discharged through the hot air delivery pipe 5. The 2-stage partition plate is interlocked with the temperature of the flue gas inlet and the temperature of the flue gas outlet respectively, so that the self-convection air adjustable air door 24 is automatically controlled, and the temperature of the temperature-stabilizing flue gas can meet the requirement that the temperature of 145-155 ℃ is increased from the range of 57 percent. The pressure stability of the sintering production system is improved to 46 percent within the range of-14.5 to-15.5 KPa, and the finished product rate of the sintering ore is improved by 5 percent.
Example 3
The partition plate type dust fall temperature regulation and pressure stabilization flue gas pretreatment device of the embodiment has the same basic structure as the embodiment, and further, as shown in fig. 4, a guide plate 26 in a W shape is connected between the front inner wall and the rear inner wall of the gravity flow type air heat exchange partition plate 3, so that the air can be prevented from generating circuitous disturbance in the dust fall pressure stabilization and temperature regulation box body, the flow speed of the air is improved, meanwhile, the effect of reinforcing ribs is achieved, and the mechanical strength of the dust fall pressure stabilization and temperature regulation box body is enhanced. As shown in fig. 3, the front outer wall and the rear outer wall of the gravity flow type air heat exchange partition plate 3 are both connected with heat exchange fins 25, so that the heat exchange area of the produced crude flue gas and the indirect cold air mixed in the dust-settling pressure-stabilizing temperature-regulating box is increased. The heat exchange fins 25 and the guide plates 26 are uniformly distributed, and the uniformity and stability of heat exchange are further improved. The two self-flowing air heat exchange partition plates 3 are respectively a left partition plate and a right partition plate, wherein the top end of the left partition plate and the bottom end of the right partition plate are both fixedly connected with wear-resistant sleeves 4, so that the phenomenon that metal dust in high-temperature crude flue gas frequently rubs corners of the partition plates to cause air leakage is avoided, the wear-resistant sleeves 4 can be arc-shaped sleeve bodies and are sleeved on the corners or wing-shaped sleeves fixed to the corners close to the partition plates, and the dust is guided to be away from the corners, so that the service life of the partition plates is prolonged; the bottom of the particle dust collecting hopper 12 is connected with an ash discharge valve.
The application process of the partition type dust fall temperature and pressure regulating flue gas pretreatment device of the embodiment has the advantages that the maximum value of the flue gas pressure is-10.5 Kpa, and the minimum value is-17.5 Kpa; the maximum value of the smoke temperature is 170 ℃, and the minimum value is 85 ℃; the smoke dust is from 3000mg/Nm 3 After flue gas produced by sintering and pelletizing enters the dust-settling pressure-stabilizing temperature-regulating box body 11 through the flue gas input pipe 1, the flue gas is cooled by self-convection cold air in the self-flow air heat exchange partition plate 3,realizes indirect blending of cold air.
When the inlet flue gas temperature of the partition type dust-settling, temperature-regulating and pressure-stabilizing flue gas pretreatment device is higher than 150 ℃, an air door of an air inlet partition, namely an adjustable air door 24 on the left side is opened; the control mode is as follows: the air damper is opened 30% at 153 ℃ for 100-300 seconds, 60% at 155 ℃ for 100-300 seconds, and 100% at 157 ℃ for 100-300 seconds.
When the temperature of the inlet flue gas is lower than 150 ℃, the control mode of the air door of the air inlet partition plate, namely the left adjustable air door 24 is as follows: the closing opening of the air door is adjusted to 50% in a time delay of 100-300 seconds at 148 ℃, and the closing opening of the air door is adjusted to 0 in a time delay of 100-300 seconds at 145 ℃.
When the temperature of the flue gas entering the electric precipitation device is higher than 150 ℃, namely the temperature of the flue gas at the outlet is higher than 150 ℃, the air inlet adjusting air door of the air outlet clapboard, namely the adjustable air door 24 at the right side is opened; the control mode is as follows: the air damper is opened 30% at 153 ℃ for 100-300 seconds, 60% at 155 ℃ for 100-300 seconds, and 100% at 157 ℃ for 100-300 seconds. .
When the temperature of the flue gas entering the electric precipitation is lower than 150 ℃, the air inlet adjusting air door of the air outlet clapboard, namely the adjustable air door 24 on the right side, is closed; the control mode is that the closing opening of the air door is adjusted to 50% in a time delay of 100-300 seconds at 147 ℃ and 0 in a time delay of 100-300 seconds at 145 ℃.
After the temperature of the flue gas is stabilized, the cooperative supporting cold air mixing valve is closed and does not work, the continuous and stable production process is improved, the quality of the sinter is improved, and the power consumption of the main fan is reduced. The indirect cold air involved dust removal mode of the embodiment has stable pressure, and reduces the load of the main fan; the temperature of the crude flue gas can be stably reduced to meet the requirement that the temperature of cloth bag dust removal is below 120 ℃;5 to 30 percent of dust particles can be recovered, and the cloth bag (electric) dust removal efficiency is improved cooperatively; harmful elements such as zinc and the like in a single dedusting point are recycled in advance and do not enter a large system; the stable coarse flue gas temperature meets the requirement of 150 +/-5 ℃ of flue gas output by efficient collaborative operation of an electric bag dust removal system, a desulfurization system and a denitration system.
When the volume of the box body is large enough, because the dust-settling, pressure-stabilizing and temperature-regulating box body 11 is subjected to heat exchange of flue gas, as shown in fig. 5 and 6, the flue gas is input through the flue gas input pipe 1, passes through the self-flowing air heat exchange partition plate 3, and is output to the next station through the flue gas output pipe 7; the method is characterized in that the produced crude flue gas flows in an inverted S shape in the dust-settling, pressure-stabilizing and temperature-adjusting box body 11, the atmosphere in the dust-settling, pressure-stabilizing and temperature-adjusting box body 11 is heated, according to the chimney effect, at the moment, as shown in fig. 6, the atmosphere in the dust-settling, pressure-stabilizing and temperature-adjusting box body rapidly rises and is discharged outwards through the hot air discharge pipe 5, the outside atmosphere enters the dust-settling, pressure-stabilizing and temperature-adjusting box body through the air inlet pipe 23 in an accelerating manner, so that atmospheric convection is formed, the essence is that the flowing atmosphere generates heat exchange with the flue gas through the dust-settling, pressure-stabilizing and temperature-adjusting box body and cools the flue gas, the atmosphere in the dust-settling, pressure-stabilizing and temperature-adjusting box body is heated, the typical chimney effect is formed, namely, the higher the flue gas temperature is, the chimney effect is more obvious, the better the temperature adjusting effect on the flue gas is, the synergistic effect is achieved, the air inlet amount can be adjusted through the electric push rod 242, the temperature adjusting range is controlled, and the effect of preventing cold air from generating strong disturbance on the flue gas is achieved. Further, the length of the hot gas delivery pipe 5 can be set as required, and according to the chimney effect, the longer the length of the hot gas delivery pipe is, the larger the flow rate of the atmosphere is, and the higher the heat exchange efficiency is. Meanwhile, the mixing and buffering of the fluctuating flue gas temperature and pressure are cooperatively met, the continuous and stable pressure and temperature in the production process can be ensured, and the yield and quality of the sinter are improved.
The partition type dust-settling, temperature-regulating and pressure-stabilizing flue gas pretreatment device and the application process thereof have the applicable maximum value of-10.5 Kpa and the minimum value of-17.5 Kpa of flue gas pressure. The pressure of the flue gas pressure fluctuation meets the range of-14.5 to-15.5 KPa, and is increased from 26.3 percent to 59 percent. The maximum applicable flue gas temperature is 170 ℃ and the minimum is 85 ℃. The temperature of the flue gas meets the range of 145-155 ℃ and is 36.3 percent. The lifting rate is increased to 61 percent. Applicable electric precipitation inlet flue gas dust is from 3000mg/Nm 3 Reduced to 1800mg/Nm 3 The working efficiency of electric precipitation is improved, and the concentration of the dust in the flue gas at the outlet of the electric precipitation is 53mg/Nm 3 Reduced to 30mg/Nm 3 The following.
The present invention and its embodiments have been described above schematically, without limitation, and what is shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. Therefore, without departing from the spirit of the present invention, a person of ordinary skill in the art should understand that the present invention shall not be limited to the embodiments and the similar structural modes without creative design.
Claims (10)
1. A clapboard type dust-settling, temperature-regulating and pressure-stabilizing flue gas pretreatment device comprises a dust-settling, pressure-stabilizing and temperature-regulating box body (11), a flue gas input pipe (1) and a flue gas output pipe (7) which are respectively provided with openings on the box walls at two sides and are fixedly connected, and a particle dust collecting hopper (12) connected to the bottom of the dust-settling, pressure-stabilizing and temperature-regulating box body (11); the method is characterized in that: two self-flowing air heat exchange clapboards (3) which are alternately distributed up and down are vertically and fixedly connected in the dust-settling pressure-stabilizing and temperature-adjusting box body (11), a flue gas channel is reserved at the upper end of the self-flowing air heat exchange clapboard (3) close to and facing the flue gas input pipe (1), and a flue gas channel is reserved at the bottom end of the self-flowing air heat exchange clapboard (3) close to and facing the flue gas output pipe (7); the upper part of the self-flowing air heat exchange partition plate (3) is connected with a hot air outlet pipe (5), the hot air outlet pipe (5) extends out of the dust-settling pressure-stabilizing temperature-regulating box body (11) and then is communicated with the atmosphere, and the outer wall of the hot air outlet pipe (5) is fixedly connected to the top wall of the dust-settling pressure-stabilizing temperature-regulating box body (11); the two sides of the lower part of the self-flowing air heat exchange partition plate (3) are respectively and externally connected with an air inlet pipe (23), the air inlet pipe (23) stretches out of the dust-falling pressure-stabilizing temperature-adjusting box body (11) and then communicates the inside of the self-flowing air heat exchange partition plate (3) with the atmosphere, and the outer wall of the air inlet pipe (23) is fixedly connected to the side wall of the dust-falling pressure-stabilizing temperature-adjusting box body (11).
2. The partition type dust fall temperature-regulating and pressure-stabilizing flue gas pretreatment device according to claim 1, characterized in that: the self-flowing air heat exchange partition plates (3) are distributed in the dust-settling pressure-stabilizing temperature-regulating box body (11) at equal intervals.
3. The partition type dust fall temperature and pressure regulating flue gas pretreatment device according to claim 1, characterized in that: an adjustable air door (24) is installed at the opening of the air inlet pipe (23).
4. The partition type dust fall temperature-regulating and pressure-stabilizing flue gas pretreatment device according to claim 3, characterized in that: adjustable air door (24) include shutter plate (241) and electric putter (242), shutter plate (241) top-down evenly distributed is a plurality of, and the one end of shutter plate (241) is connected along rotating in the orificial left side of round pin axle and air intake pipe (23), and the other end of shutter plate (241) is connected along rotating through round pin axle and air intake pipe (23) orificial right side, electric putter (242) are connected in air intake pipe (23) mouth of pipe lateral surface, and electric putter's telescopic link (243) are connected with the one end rotation of rocking arm, and the other end of rocking arm is connected in the round pin axle of shutter plate (241).
5. The partition type dust fall temperature-regulating and pressure-stabilizing flue gas pretreatment device according to claim 3, characterized in that: a W-shaped guide plate (26) is connected between the front inner wall and the rear inner wall of the self-flowing air heat exchange partition plate (3).
6. The partition type dust fall temperature and pressure regulating flue gas pretreatment device according to claim 5, characterized in that: the front outer wall and the rear outer wall of the self-flowing air heat exchange partition plate (3) are both connected with heat exchange fins (25).
7. The partition type dust fall temperature and pressure regulating flue gas pretreatment device according to claim 6, characterized in that: the heat exchange plates (25) and the guide plates (26) are uniformly distributed.
8. The partition type dust fall temperature-regulating and pressure-stabilizing flue gas pretreatment device according to claim 5, characterized in that: the two gravity flow type air heat exchange partition plates (3) are respectively a left partition plate and a right partition plate, wherein the top end of the left partition plate and the bottom end of the right partition plate are fixedly connected with wear-resistant sleeves (4); the bottom of the particle dust collecting hopper (12) is connected with an ash discharge valve.
9. An application process of the clapboard type dust-settling temperature-regulating pressure-stabilizing flue gas pretreatment device as claimed in any one of claims 2 to 8, which is characterized in that: after flue gas of a metallurgical production system enters a dust-settling and pressure-stabilizing temperature-regulating box body (11) through a flue gas input pipe (1), the flue gas is cooled by self-convective cold air in a self-flowing air heat exchange partition plate (3), so that indirect cold air blending is realized.
10. The application process of the partition type dust fall temperature and pressure regulating flue gas pretreatment device according to claim 9, characterized in that: when the temperature of the inlet flue gas is higher than the target temperature, the adjustable air door (24) on the left side is opened; when the temperature of the inlet flue gas is lower than the target temperature, the adjustable air door (24) on the left side is opened; when the temperature of the outlet flue gas is higher than the target temperature, the adjustable air door (24) on the right side is opened; when the outlet flue gas temperature is lower than the target temperature, the adjustable air door (24) on the right side is closed.
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| CN201678713U (en) * | 2009-12-29 | 2010-12-22 | 攀枝花钢城集团有限公司 | Lower zinc oxide collection device for rotary kiln head |
| CN208990571U (en) * | 2019-02-28 | 2019-06-18 | 上海益格新技术工程有限公司 | A kind of natural air cooled register and the flue gas denitrification system using the device |
| CN211885970U (en) * | 2020-04-14 | 2020-11-10 | 沧州天泽环保科技有限公司 | Be applied to flue gas filter equipment in industrial production workshop |
| CN111878315A (en) * | 2020-08-05 | 2020-11-03 | 贵州环科环境工程有限公司 | Wind power generation device and method of high-temperature flue gas mechanical cooler |
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