CN219272636U - Multistage spraying wet flue gas mercury removal integrated device - Google Patents

Multistage spraying wet flue gas mercury removal integrated device Download PDF

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Publication number
CN219272636U
CN219272636U CN202223475303.8U CN202223475303U CN219272636U CN 219272636 U CN219272636 U CN 219272636U CN 202223475303 U CN202223475303 U CN 202223475303U CN 219272636 U CN219272636 U CN 219272636U
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mercury removal
flue gas
inlet
tower
outlet
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贺治国
刘鉴葶
倪晨权
王廷峰
钟慧
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Hunan Zhuye Environmental Protection Technology Co ltd
Central South University
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Hunan Zhuye Environmental Protection Technology Co ltd
Central South University
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02ATECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters

Abstract

A multi-stage spray wet flue gas mercury removal integrated device comprises a primary mercury removal tower, a secondary mercury removal tower and an inclined plate sedimentation tank for flocculating a saturated mercury removal agent; the utility model can improve the mercury removal efficiency of the flue gas of a typical lead-zinc smelting enterprise, effectively reduce the mercury content in the flue gas and ensure that the flue gas can reach the standard and be discharged.

Description

Multistage spraying wet flue gas mercury removal integrated device
Technical Field
The utility model belongs to the technical field of flue gas purification of typical lead-zinc smelting enterprises, and particularly relates to a multi-stage spray wet flue gas mercury removal integrated device.
Background
Mercury removal using existing flue gas control devices is the most economical measure. At present, domestic smelting enterprises mainly remove mercury through desulfurization, and the pertinence to mercury removal is insufficient. For example, chinese utility model (CN 205145917U) discloses a flue gas mercury removal system, which is composed of a flue gas temperature control device, a dust removal device and a mercury adsorption tower, wherein the flue gas temperature control device, the dust removal device and the mercury adsorption tower are connected, and the flue gas mercury removal system primarily removes particulate matters in the flue gas in a physical filtration mode, and simultaneously removes mercury in the particulate matters, so that the particulate matters are prevented from being adsorbed on a subsequent adsorbent to affect adsorption efficiency; when removing mercury, the flue gas is enabled to pass through the gold-plated quartz sand of the adsorbent according to a certain flow, mercury and gold on the surface of the adsorbent form amalgam, so that the mercury is fixed on the adsorbent to remove the mercury in the flue gas, and then the adsorbed mercury is released for subsequent utilization by heating the gold-plated quartz sand. The device uses expensive noble metal as mercury adsorbent, and needs to consume a large amount of electric energy, and has high cost. As disclosed in chinese utility model (CN 206229181U), a flue gas mercury removal system is disclosed, comprising a flue, an induced draft fan, a heater, an activated carbon layer and a dust remover, wherein the dust remover is installed on the flue and is used for capturing fly ash in the flue; the inlet of the induced draft fan is communicated with a flue at the outlet end of the dust remover, the outlet of the induced draft fan is communicated with the inlet of the active carbon layer, and the induced draft fan introduces the dust-removed flue gas into the active carbon layer for reaction to generate elemental sulfur; the heater heats the active carbon layer and heats the elemental sulfur, so that the elemental sulfur is heated and gasified; activated carbon layerThe outlet of the flue gas filter is communicated with the flue at the inlet end of the dust remover, and gasified elemental sulfur enters the flue through the pipeline under the action of flue gas. The reactor heats the activated carbon and SO in the flue gas 2 The elemental sulfur is converted into elemental sulfur in the process of contacting the heated activated carbon, the elemental sulfur is distributed in the flue gas, enters the flue along with the flue gas, reacts with mercury in the flue gas to generate mercuric sulfide, and is captured and removed by a dust remover. The device utilizes sulfur dioxide in the flue gas to reduce into elemental sulfur, and then utilizes elemental sulfur to catch the elemental mercury in the flue gas, and the device energy consumption is big, and utilizes elemental sulfur to catch the reaction inefficiency of mercury.
The mercury removal technology closest to production application is to directly spray active carbon particles into the flue gas to remove elemental mercury or to remove elemental mercury by using an active carbon adsorption bed. Spraying Powdered Activated Carbon (PAC) into the flue gas, removing the powdered activated carbon by a dust remover (such as an electrostatic precipitator and a bag-type dust remover) at the downstream of the powdered activated carbon after adsorbing mercury, wherein the powdered activated carbon is mixed with fly ash and cannot be regenerated. The problems of low capacity, poor mixing property and low thermodynamic stability exist, and the utilization rate and the consumption of the activated carbon are low, so that the cost of directly adopting the activated carbon adsorption method is too high. But the economy is not enough for enterprises, so the adoption of the more economical and efficient mercury removal agent for realizing the integrated flue gas mercury removal has very important significance.
Disclosure of Invention
The utility model solves the defects of the prior art and provides a multi-stage spraying wet flue gas mercury removal integrated device which improves the flue gas mercury removal efficiency of lead-zinc smelting enterprises and reduces the material cost in wet mercury removal.
In order to achieve the aim, the utility model firstly provides a multi-stage spray wet flue gas mercury removal integrated device, which comprises a primary mercury removal tower, a secondary mercury removal tower and an inclined plate sedimentation tank for flocculating a saturated mercury removal agent; the flue gas outlet of the primary mercury removal tower is connected with the flue gas inlet of the secondary mercury removal tower, the feed inlet of the primary mercury removal tower and the feed inlet of the secondary mercury removal tower are respectively connected with the outlet of the mercury removal agent conveying pump through conveying pipes, the inlet of the mercury removal agent conveying pump is connected with the outlet of the mercury removal agent preparation tank through pipelines, the inlet of the inclined plate settling tank is connected with the outlet of the underflow pump through pipelines, and the inlet of the underflow pump is respectively connected with the material circulation spraying systems of the primary mercury removal tower and the secondary mercury removal tower through pipelines.
In this embodiment, the inclined plate settling tank is provided with a flocculant inlet, a sediment outlet and a liquid outlet, the liquid outlet of the inclined plate settling tank is connected with an inlet of the sewage acid treatment system, the flocculant inlet of the inclined plate settling tank is connected with an outlet of the flocculant delivery pump through a pipeline, and an inlet of the flocculant delivery pump is connected with an outlet of the flocculant configuration tank.
In this embodiment, the one-level mercury removal tower includes first tower body and material circulation spray system, the bottom of first tower body is equipped with first discharge gate, the middle part is equipped with first flue gas import and first feed inlet, the top is equipped with first flue gas export, material circulation spray system includes first circulating pump and sets up in first tower body, lay the first spraying system of multilayer between first flue gas import and first flue gas export, the first discharge gate of one-level mercury removal tower passes through the inlet connection of pipeline and first circulating pump, the export of first circulating pump passes through the inlet connection of pipeline and first spraying system.
In this embodiment, a gas sampler is disposed in the first flue gas inlet.
In this embodiment, the second-stage mercury removal tower includes second tower body and material circulation spray system, the bottom of second tower body is provided with the second discharge gate, the middle part is provided with second flue gas import and second feed inlet, the top is provided with the second flue gas export, material circulation spray system includes the second circulating pump and sets up in the second tower body, lay the multilayer second spray system between second flue gas import and second flue gas export, the second discharge gate of second-stage mercury removal tower passes through the inlet connection of pipeline and second circulating pump, the export of second circulating pump passes through the inlet connection of pipeline and second spray system.
In this embodiment, the second flue gas outlet of the secondary mercury removal tower is connected to the fan through a pipeline, and a gas sampler is also installed in the pipeline between the secondary mercury removal tower and the fan.
By adopting the structure, the utility model has the following technical effects:
1) The device adopts a spraying mode to remove mercury from flue gas, and after the mercury removing agent is saturated, the mercury removing agent can be recovered through the inclined plate sedimentation tank, and new mercury removing agent can be conveyed into the tower through the mercury removing agent conveying pump, so that a set of recyclable flue gas mercury removing device is formed, the downtime is reduced, the flue gas mercury removing efficiency of enterprises is improved, and the mercury removing cost is saved.
2) The mercury removing agent adopted in the device is obtained by reacting iron-containing silicate mineral with a multi-element organic acid solution, then carrying out solid-liquid separation, and drying a solid product.
Drawings
Fig. 1 is a schematic structural view of the present utility model.
In the attached drawing, a primary mercury removal tower is shown in the specification, wherein the primary mercury removal tower is shown in the specification; 11. a first flue gas inlet; 12. a first feed port; 13. a first flue gas outlet; 14. a first spray system; 15. a first discharge port; 16. a first circulation pump; 2. a secondary mercury removal tower; 21. a second flue gas inlet; 22. a second discharge port; 23. a second spray system; 24. a second flue gas outlet; 25. a second discharge port; 26. a second circulation pump; 3. a sloping plate sedimentation tank; 31. an underflow pump; 4. a mercury removal agent preparation tank; 41. a mercury removal agent delivery pump; 42. a delivery tube; 5. a flocculant preparation tank; 51. a flocculant delivery pump; 6. a waste acid treatment system; 7. a blower.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
In addition, the technical solutions of the embodiments of the present utility model may be combined with each other, but it is necessary to be based on the fact that those skilled in the art can implement the technical solutions, and when the technical solutions are contradictory or cannot be implemented, the combination of the technical solutions should be considered as not existing, and not falling within the scope of protection claimed by the present utility model.
As shown in fig. 1, the utility model provides a multi-stage spray wet flue gas mercury removal integrated device, which comprises a primary mercury removal tower 1, a secondary mercury removal tower 2 and an inclined plate sedimentation tank 3.
The primary mercury removal tower 1 comprises a first tower body, a first discharge hole 15 arranged at the bottom of the first tower body, a first flue gas inlet 11 and a first feed inlet 12 arranged in the middle of the first tower body, a first flue gas outlet 13 arranged at the top of the first tower body, and a plurality of layers of first spraying systems 14 arranged in the first tower body and arranged between the first flue gas inlet 11 and the first flue gas outlet 13, wherein a gas sampler is arranged in the first flue gas inlet 11,
the secondary mercury removal tower 2 comprises a second tower body, a second discharge hole 22 arranged at the bottom of the second tower body, a second flue gas inlet 21 and a second feed inlet 25 which are arranged in the middle of the second tower body, a second flue gas outlet 24 arranged at the top of the second tower body, and a plurality of layers of second spraying systems 23 which are arranged in the second tower body and are arranged between the second flue gas inlet 21 and the second flue gas outlet 24,
the first flue gas outlet 13 of the primary mercury removal tower 1 is connected with the second flue gas inlet 21 of the secondary mercury removal tower 2 through a pipeline, the second flue gas outlet 24 of the secondary mercury removal tower 2 is connected with the fan 7 through a pipeline, and a gas sampler is arranged in the pipeline between the secondary mercury removal tower 2 and the fan 7.
The first discharge port of the primary mercury removal tower 1 is connected with the inlet of a first circulating pump 16 through a pipeline, the outlet of the first circulating pump 16 is connected with the inlet of a first spraying system 14 through a pipeline, the second discharge port of the secondary mercury removal tower 2 is connected with the inlet of a second circulating pump 26 through a pipeline, and the outlet of the second circulating pump 26 is connected with the inlet of a second spraying system 23 through a pipeline;
the first feed inlet 12 of the primary mercury removal tower 1 is connected with the outlet of a mercury removal agent delivery pump 41 through a delivery pipe 42 and the second feed inlet 25 of the secondary mercury removal tower 2, the inlet of the mercury removal agent delivery pump 41 is connected with the outlet of a mercury removal agent preparation tank 4 through a pipeline, and mercury removal adsorption materials in the mercury removal agent preparation tank 4 adopt the following publication number: CN114425305a, patent name: a mercury adsorbing material, a preparation method thereof and application thereof in flue gas or solution mercury removal, and the mercury removing agent prepared by the utility model patent;
the inlet of the inclined plate sedimentation tank 3 is connected with the outlet of the underflow pump through a pipeline, and the inlet of the underflow pump is respectively connected with the outlets of the first circulating pump 16 and the second circulating pump 26 through a pipeline; the inclined plate sedimentation tank 3 is provided with a flocculating agent inlet, a sediment outlet and a liquid outlet, the liquid outlet of the inclined plate sedimentation tank 3 is connected with the inlet of the sewage acid treatment system 6, the flocculating agent inlet of the inclined plate sedimentation tank 3 is connected with the outlet of a flocculating agent conveying pump through a pipeline, and the inlet of the flocculating agent conveying pump is connected with the outlet of the flocculating agent configuration tank 5; PAM is used as the flocculant in this example.
The device has the following using process:
firstly, preparing a tailing mercury removal agent in a mercury removal agent preparation tank 4, inputting the tailing mercury removal agent into a primary mercury removal tower 1 and a secondary mercury removal tower 2 by a mercury removal agent delivery pump 41, and then opening a primary circulating pump 16 and a secondary circulating pump 26 to carry out circulating spraying, wherein a three-layer first spraying device is arranged in the secondary mercury removal tower 2. After stable operation, the flue gas valve is opened, flue gas enters the primary mercury removal tower 1 from the first flue gas inlet 11, and the flue gas is fully contacted and adsorbed with the tailing mercury removal agent sprayed by the first spraying device 14, so that primary mercury removal is completed. Then the flue gas enters a secondary mercury removal tower 2 to carry out secondary mercury removal, and the mercury in the flue gas passes through a mercury removal agent and then has ion exchange effect, so that the effect of removing the mercury in the flue gas is realized; finally, the flue gas is driven by a fan 7 to enter the next treatment step.
After the mercury removal tower is used for a period of time, after the mercury removal agent is saturated, the underflow pump 31 is opened, PAM flocculation dust in the flocculant preparation tank 5 is discharged into the inclined plate sedimentation tank 3 through the flocculant delivery pump 51, the flocculated solid matters are collected by utilizing the solid-liquid separation function of the inclined plate sedimentation tank 3, and the surface layer liquid is discharged into the sewage acid treatment system 6 for further treatment.
The foregoing description of the preferred embodiments of the present utility model should not be construed as limiting the scope of the utility model, but rather utilizing equivalent structural changes made in the present utility model description and drawings or directly/indirectly applied to other related technical fields are included in the scope of the present utility model.

Claims (6)

1. The multi-stage spray wet flue gas mercury removal integrated device is characterized by comprising a primary mercury removal tower, a secondary mercury removal tower and an inclined plate sedimentation tank for flocculating a saturated mercury removal agent; the flue gas outlet of the primary mercury removal tower is connected with the flue gas inlet of the secondary mercury removal tower, the feed inlet of the primary mercury removal tower and the feed inlet of the secondary mercury removal tower are respectively connected with the outlet of the mercury removal agent conveying pump through conveying pipes, the inlet of the mercury removal agent conveying pump is connected with the outlet of the mercury removal agent preparation tank through pipelines, the inlet of the inclined plate settling tank is connected with the outlet of the underflow pump through pipelines, and the inlet of the underflow pump is respectively connected with the material circulation spraying systems of the primary mercury removal tower and the secondary mercury removal tower through pipelines.
2. The integrated multi-stage spray wet flue gas mercury removal device according to claim 1, wherein the inclined plate settling tank is provided with a flocculant inlet, a sediment outlet and a liquid outlet, the liquid outlet of the inclined plate settling tank is connected with the inlet of the sewage acid treatment system, the flocculant inlet of the inclined plate settling tank is connected with the outlet of the flocculant delivery pump through a pipeline, and the inlet of the flocculant delivery pump is connected with the outlet of the flocculant configuration tank.
3. The multi-stage spray wet flue gas mercury removal integrated device according to claim 1, wherein the primary mercury removal tower comprises a first tower body and a material circulating spray system, a first discharge hole is formed in the bottom of the first tower body, a first flue gas inlet and a first feed hole are formed in the middle of the first tower body, a first flue gas outlet is formed in the top of the first tower body, the material circulating spray system comprises a first circulating pump and a plurality of layers of first spray systems which are arranged in the first tower body and are arranged between the first flue gas inlet and the first flue gas outlet, the first discharge hole of the primary mercury removal tower is connected with the inlet of the first circulating pump through a pipeline, and the outlet of the first circulating pump is connected with the inlet of the first spray system through a pipeline.
4. The multi-stage spray wet flue gas mercury removal integrated device of claim 3, wherein a gas sampler is disposed in the first flue gas inlet.
5. The multi-stage spray wet flue gas mercury removal integrated device according to claim 1, wherein the secondary mercury removal tower comprises a second tower body and a material circulation spray system, a second discharge hole is formed in the bottom of the second tower body, a second flue gas inlet and a second feed hole are formed in the middle of the second tower body, a second flue gas outlet is formed in the top of the second tower body, the material circulation spray system comprises a second circulation pump and a multi-layer second spray system which is arranged in the second tower body and between the second flue gas inlet and the second flue gas outlet, the second discharge hole of the secondary mercury removal tower is connected with the inlet of the second circulation pump through a pipeline, and the outlet of the second circulation pump is connected with the inlet of the second spray system through a pipeline.
6. The integrated multi-stage spray wet flue gas mercury removal device according to claim 5, wherein the second flue gas outlet of the secondary mercury removal tower is connected with a fan through a pipeline, and a gas sampler is installed in the pipeline between the secondary mercury removal tower and the fan.
CN202223475303.8U 2022-12-26 2022-12-26 Multistage spraying wet flue gas mercury removal integrated device Active CN219272636U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202223475303.8U CN219272636U (en) 2022-12-26 2022-12-26 Multistage spraying wet flue gas mercury removal integrated device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202223475303.8U CN219272636U (en) 2022-12-26 2022-12-26 Multistage spraying wet flue gas mercury removal integrated device

Publications (1)

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CN219272636U true CN219272636U (en) 2023-06-30

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