CN210410024U - Be used for modified device of sintering flue gas quenching and tempering - Google Patents
Be used for modified device of sintering flue gas quenching and tempering Download PDFInfo
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- CN210410024U CN210410024U CN201920845451.3U CN201920845451U CN210410024U CN 210410024 U CN210410024 U CN 210410024U CN 201920845451 U CN201920845451 U CN 201920845451U CN 210410024 U CN210410024 U CN 210410024U
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Abstract
A device for modifying and tempering sintering flue gas comprises a powder bin, wherein the powder bin is connected with a compressed air system through a pipeline, a manual inserting plate door and a rotary feeding valve are arranged on the pipeline at the bottom of the powder bin, the rotary feeding valve is connected with an ejector, the ejector is connected with a fan, and natural wind from the fan is mixed with modified powder in the powder bin in the ejector; the ejector is further connected with a gas uniform distributor through a pipeline, the gas uniform distributor is connected with a powder spray gun, and the powder spray gun is connected with a compressed air system and is installed on a sintering flue gas denitration front flue. Through sintering flue gas conditioner agent device, the effectual smoke and dust fusion bonding under high temperature in the sintering flue gas that has solved blocks up the problem of catalyst, has ensured sintering flue gas SCR deNOx systems's safe and stable operation simultaneously, has guaranteed SCR's denitration efficiency, guarantees sintering machine system's safe and stable operation, makes sintering flue gas NOx reach the emission standard that environmental protection department required.
Description
Technical Field
The utility model relates to a flue gas treatment technical field, in particular to be used for modified device of sintering flue gas quenching and tempering.
Background
At present, steel enterprises in China face severe problems of excess capacity, insufficient innovation, continuously strengthened environmental energy constraint and the like. The government work report in 2018 provides the task requirement of promoting ultralow emission modification in industries such as steel and the like, wins the blue sky guard war and creates green water and green mountains together. The ecological environment department drafted "ultra-low emission reconstruction working scheme (draft of comments) of iron and steel enterprises," it is clear that "the sintering head flue gas and pellet roasting flue gas have a standard oxygen content of below 16%, and the hourly mean emission concentrations of particulate matters, sulfur dioxide and nitrogen oxides are not higher than 10mg/m3, 35mg/m3 and 50mg/m3, respectively. In order to respond to the national environmental protection requirement, various steel enterprises treat the sintering flue gas following the national requirement.
The mainstream process of sintering flue gas denitration adopts an SCR (selective catalytic reduction) denitration process, because the temperature of sintering flue gas is low and cannot meet the temperature requirement of SCR denitration, the flue gas needs to be heated to about 300 ℃, a large amount of alkali metal substances such as Na +, K + and the like contained in the sintering flue gas are melted at high temperature, smoke dust is bonded and bridged, dust is adhered to the surface of a catalyst, the holes of the catalyst are blocked, the resistance of the flue gas is increased, and the normal operation of a system is influenced.
The denitration of sintering flue gas is just started at home, and only a few sintering flue gas denitration treatments are performed worldwide, so that the denitration of sintering flue gas is in an exploration stage and no mature technical experience is referred to. National policy requires that denitration of sintering flue gas must be carried out, and under the background, only a flue gas denitration technology of a power plant can be introduced, and because the characteristics of two types of flue gas are greatly different, the problems of blockage and the like occur after denitration of sintering flue gas is established and operated, so that the denitration efficiency and the safe and stable operation of a sintering machine are seriously influenced.
In the face of the problem which needs to be solved urgently, measures such as interception, increase of purging strength and the like have certain effect on the blockage of the catalyst, but the effect is very little, and the blockage problem cannot be solved fundamentally. The problem of sticking and blocking cannot be solved by pure mechanical measures.
At present, no technology for tempering denitration flue gas is available in China, and the invention fundamentally solves the problem that the sintering flue gas is fused, lapped and blocked at high temperature.
SUMMERY OF THE UTILITY MODEL
In order to overcome the problems in the prior art, the utility model provides a device for modifying sintering flue gas through tempering.
The utility model provides a technical scheme that its technical problem adopted is: the device for modifying the sintering flue gas quality comprises a powder bin, wherein the powder bin is connected with a compressed air system through a pipeline, a manual inserting plate door and a rotary feeding valve are arranged on the pipeline at the bottom of the powder bin, the rotary feeding valve is connected with an ejector, the ejector is connected with a fan, and natural wind from the fan is mixed with modified powder in the powder bin in the ejector; the ejector is further connected with a gas uniform distributor through a pipeline, the gas uniform distributor is connected with a powder spray gun, and the powder spray gun is connected with a compressed air system and is installed on a sintering flue gas denitration front flue.
Further, a bag-type dust collector is arranged at the top of the powder bin.
Further, an electric heater is arranged on a pipeline between the compressed air system and the powder bin.
Furthermore, the rotary feeding valve is variable in frequency and is arranged at the upper part of the jet pump to uniformly and quantitatively feed the powder from the powder bin into the jet pump.
Furthermore, the bottom of the powder bin is provided with a fluidizing device which comprises fluidizing plates uniformly distributed at the bottom of the powder bin, each fluidizing plate is provided with a switch valve, and air from a compressed air system fluidizes powder in the powder bin through the fluidizing plates.
Furthermore, the blower is a roots blower, the roots blower comprises two roots blowers, and the two roots blowers are connected with the ejector through pipelines.
To sum up, the utility model discloses an above-mentioned technical scheme's beneficial effect as follows:
through sintering flue gas conditioner agent device, the effectual smoke and dust fusion bonding under high temperature in the sintering flue gas that has solved blocks up the problem of catalyst, has ensured sintering flue gas SCR deNOx systems's safe and stable operation simultaneously, has guaranteed SCR's denitration efficiency, guarantees sintering machine system's safe and stable operation, makes sintering flue gas NOx reach the emission standard that environmental protection department required.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a schematic view of the installation position relationship of the spray gun and the flue gas pipeline.
In the figure:
1. the device comprises a Roots blower, 2, an injector, 3, a rotary feeding valve, 4, a manual inserting plate door, 5, a fluidizing device, 6, a powder bin, 7, a bag-type dust remover, 8, a gas distributor, 9, a spray gun, 10, an electric heater, 11, a compressed air system and 12, a flue.
Detailed Description
The features and principles of the present invention will be described in detail below with reference to the accompanying drawings, and the illustrated embodiments are only for explaining the present invention, and do not limit the scope of the present invention.
As shown in fig. 1 and 2, the device for modifying and tempering sintering flue gas comprises a powder bin 6, wherein the powder bin 6 is connected with a compressed air system 11 through a pipeline, a manual inserting plate door 4 and a rotary feeding valve 3 are arranged on the pipeline at the bottom of the powder bin 6, the rotary feeding valve 3 is connected with an ejector 2, the ejector 2 is connected with a fan, and natural wind from the fan is mixed with modified powder in the powder bin 6 in the ejector 2; the ejector 2 is further connected with a gas uniform distributor 8 through a pipeline, the gas uniform distributor 8 is connected with a powder spray gun 9, and the powder spray gun 9 is connected with a compressed air system 11 and is installed on a sintering flue gas denitration front flue 12.
And a bag-type dust collector 7 is arranged at the top of the powder bin 6.
An electric heater 10 is arranged on a pipeline between the compressed air system 11 and the powder bin 6, and the electric heater 10 heats the compressed air from the compressed air system 11 and then leads the heated compressed air into the powder bin 6.
The bottom of the powder bin 6 is provided with a fluidizing device 5, the fluidizing device 5 comprises fluidizing plates uniformly distributed at the bottom of the powder bin 6, each fluidizing plate is provided with a switch valve, and air from a compressed air system 11 fluidizes powder in the powder bin 6 through the fluidizing plates.
The rotary feeding valve 3 is variable in frequency and is arranged at the upper part of the jet pump to uniformly and quantitatively feed the powder from the powder bin 6 into the jet pump 2.
The blower is roots blower 1, and roots blower 1 includes two, and two roots blowers 1 are connected with ejector 2 through the pipeline.
The working principle of the device is as follows:
the system adopts dilute phase conveying (when the speed of a fluidized medium is higher, solid particles are taken out, the particle entrainment is increased along with the increase of the speed of the fluidized medium, the void ratio is increased, the pressure drop is reduced, the solid particles form a suspended dilute phase in fluid and are entrained out together with the fluid from a fluidized bed, the stage is called as an air flow conveying stage and is also called as dilute phase conveying), two Roots blowers 1 are arranged for conveying the modifying agent powder, natural wind from the Roots blowers 1 and the modifying agent powder are sprayed out from an ejector 2 (an ejector 2, also called as an ejector, a jet vacuum ejector 2, a jet pump, a water ejector 2 and a vacuum ejector 2) through a vacuum obtaining device which utilizes the fluid to transfer energy and mass, water flow with certain pressure is sprayed out through nozzles symmetrically and uniformly distributed into certain lateral inclination, converging on one focal point; because the flow velocity of the sprayed water is extremely high, the pressure energy is converted into the velocity energy, so that the pressure in the air suction area is reduced to generate vacuum), and the mixture is sprayed out by a spraying pump of the sprayer 2 at a certain speed under the action of the Roots blower 1 and is conveyed to the air uniform distributor 8 through a conveying pipeline, so that the powder-air mixture is uniformly distributed into the powder spray gun 9. Meanwhile, the powder spray gun 9 is also provided with a compressed air interface, the compressed air has the function of atomizing the powder-air mixture into fine particles, the powder-air mixture is sprayed into the flue at a high speed under the pushing of the compressed air, and the fine modified powder particles in the flue react with dust in the flue gas quickly to finish the purpose of modifying the smoke dust in a short time.
The powder spray gun 9 is a double-fluid spray gun 9 and is provided with two connectors, one is a powder-gas mixture connector and the other is a compressed air connector. The bottom of the conditioning agent powder bin 6 is provided with a fluidizing device 5, and fluidizing air heated by an electric heater 10 has a fluidizing effect on powder through a fluidizing plate so as to prevent the powder from being agglomerated in the bin and prevent the system from running.
The spray gun 9 is arranged on the flue wall before entering the SCR reactor, flow field simulation is required to be carried out on the arrangement on the flue, the quantity, the arrangement form and the installation form all need to meet the requirements of the flow field, and the powder-gas mixture can be ensured to be contacted with the flue gas in the flue in the largest area and mixed uniformly as far as possible.
The powder spraying atomizer is arranged on the wall of the flue gas according to the flow field simulation, the gas-powder mixture entering the powder atomizing device is atomized into fine particles under the action of compressed air and sprayed into the flue, the conditioning powder is uniformly mixed with the smoke dust in the flue gas in the flue, the smoke dust characteristics of the sintering flue gas are modified under the action of the conditioning agent, the original sintering smoke dust is fused and bonded at high temperature, the modified sintering smoke dust is not bonded, and the flowability is good. The device can effectively change the smoke characteristics in the sintering smoke, thereby avoiding the problem that the sintering smoke is bonded and bridged at high temperature and easily blocks a catalyst, and ensuring the normal and efficient operation of the sintering smoke SCR denitration system.
This modified device of sintering flue gas quenching and tempering can effectually change alkali metal material such as Na +, K + in the sintering flue gas and take place the melt adhesion characteristic under high temperature, and the mobility that the smoke and dust was taken up the bridge change by original bonding is good, and the non-adhesion is not adhered, can very easily pass through the catalyst hole to avoid its jam to the catalyst, the problem that denitration efficiency was reduced in the deactivation of catalyst, guaranteed the normal high-efficient operation of sintering flue gas SCR deNOx systems and sintering machine system.
The above-mentioned embodiments are merely descriptions of the preferred embodiments of the present invention, and are not intended to limit the scope of the present invention, and those skilled in the art should be able to make various modifications and improvements on the present invention without departing from the spirit of the present invention.
Claims (6)
1. A device for modifying and tempering sintering flue gas is characterized by comprising a powder bin, wherein the powder bin is connected with a compressed air system through a pipeline, a manual inserting plate door and a rotary feeding valve are arranged on the pipeline at the bottom of the powder bin, the rotary feeding valve is connected with an ejector, the ejector is connected with a fan, and natural wind from the fan is mixed with modified powder in the powder bin in the ejector; the ejector is further connected with a gas uniform distributor through a pipeline, the gas uniform distributor is connected with a powder spray gun, and the powder spray gun is connected with a compressed air system and is installed on a sintering flue gas denitration front flue.
2. The device for modifying and tempering sintering flue gas according to claim 1, wherein a bag-type dust collector is installed at the top of the powder bin.
3. The device for modifying and tempering sintering flue gas as recited in claim 1, wherein an electric heater is installed on the pipeline between the compressed air system and the powder bin.
4. The device for modifying and tempering sintering flue gas as recited in claim 1, wherein said rotary feed valve is variable frequency and is disposed at the upper part of the ejector pump for feeding the powder from the powder bin into the ejector uniformly and quantitatively.
5. The device for conditioning and modifying sintering flue gas as claimed in claim 1, wherein the powder bin is provided with a fluidizing device at the bottom, the fluidizing device comprises fluidizing plates uniformly distributed at the bottom of the powder bin, each fluidizing plate is provided with a switch valve, and air from a compressed air system fluidizes powder in the powder bin through the fluidizing plates.
6. The device for modifying sintering flue gas according to claim 1, wherein the blower is a roots blower, the roots blower comprises two roots blowers, and the two roots blowers are connected with the ejector through pipelines.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201920845451.3U CN210410024U (en) | 2019-06-05 | 2019-06-05 | Be used for modified device of sintering flue gas quenching and tempering |
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| CN201920845451.3U CN210410024U (en) | 2019-06-05 | 2019-06-05 | Be used for modified device of sintering flue gas quenching and tempering |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110090523A (en) * | 2019-06-05 | 2019-08-06 | 山东国舜建设集团有限公司 | One kind being used for the quenched reforming apparatus of sintering flue gas |
| CN112027675A (en) * | 2020-07-16 | 2020-12-04 | 北京国电龙源环保工程有限公司 | Anti-clogging and accumulation-preventing slaked lime discharging system and method |
-
2019
- 2019-06-05 CN CN201920845451.3U patent/CN210410024U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110090523A (en) * | 2019-06-05 | 2019-08-06 | 山东国舜建设集团有限公司 | One kind being used for the quenched reforming apparatus of sintering flue gas |
| CN112027675A (en) * | 2020-07-16 | 2020-12-04 | 北京国电龙源环保工程有限公司 | Anti-clogging and accumulation-preventing slaked lime discharging system and method |
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