CN212440690U - Ultra-low emission treatment device for lime kiln flue gas - Google Patents
Ultra-low emission treatment device for lime kiln flue gas Download PDFInfo
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- CN212440690U CN212440690U CN202020998724.0U CN202020998724U CN212440690U CN 212440690 U CN212440690 U CN 212440690U CN 202020998724 U CN202020998724 U CN 202020998724U CN 212440690 U CN212440690 U CN 212440690U
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Abstract
The utility model discloses a lime kiln flue gas ultra-low emission treatment device, which comprises an SDS dry desulfurization system, a bag-type dust remover, an SCR low-temperature denitration system and an induced draft fan which are arranged in sequence according to the technological process; the SCR low-temperature denitration system comprises a rotary heat exchanger connected with a bag-type dust collector, the rotary heat exchanger is connected with a heating furnace, the heating furnace is connected with a denitration reactor, the denitration reactor is connected with the rotary heat exchanger in a return mode, and the denitration reactor is provided with an ammonia water adding system. The device realizes the ultralow emission treatment work of the flue gas on the premise of low energy consumption, high efficiency, stable and safe operation of the lime kiln flue gas treatment device through the most reasonable and optimal process configuration.
Description
Technical Field
The utility model relates to a coal fired power plant desulfurization waste water treatment and resource cyclic utilization technical field, concretely relates to utilize processing apparatus of flue gas waste heat evaporative concentration and cooperation electrolysis system chlorine recovery resource.
Background
The flue gas discharged during the calcination of the lime contains a large amount of harmful gases and dust, and the harmful gases and dust have great harm to human bodies. And part of enterprises have thin environmental protection awareness and weak regulation and control force, so that serious air pollution is caused. Under the high pressure situation that the country advocates environmental protection and energy saving, the pollution control of the lime kiln is not slow enough. However, at present, no deep research and development is carried out on the work of ultra-low emission treatment of the lime kiln flue gas.
The existing lime kiln flue gas treatment device mainly comprises a desulfurization system and a dust removal system, most of the denitrification systems are not arranged, and most of desulfurization is carried out by adopting a sodium-alkali wet desulfurization process. Although the desulfurization efficiency of the sodium-alkali wet desulfurization process is high, the process is difficult to be matched with the SCR denitration process, if SCR is arranged before desulfurization, the influence of the sulfur dioxide low-temperature denitration catalyst in flue gas is large, and the catalyst poisoning can be caused after long-term operation. If SCR is arranged after desulfurization, because the temperature of the flue gas after desulfurization is lower, about 50 ℃, and the lowest operation temperature of the low-temperature catalyst is about 180 ℃, the flue gas needs to be heated, and the energy consumption is higher.
SUMMERY OF THE UTILITY MODEL
In view of the above problem, the utility model discloses a lime kiln flue gas ultralow emission processing apparatus through the most reasonable, the technological configuration of optimization, makes lime kiln flue gas processing apparatus under the prerequisite of low energy consumption, high efficiency, stable safe operation, has realized the ultralow emission of flue gas and has administered work.
A lime kiln flue gas ultra-low emission treatment device comprises an SDS dry desulfurization system, a bag-type dust collector, an SCR low-temperature denitration system and an induced draft fan which are sequentially arranged according to the technological process; the SCR low-temperature denitration system comprises a rotary heat exchanger connected with a bag-type dust collector, the rotary heat exchanger is connected with a heating furnace, the heating furnace is connected with a denitration reactor, the denitration reactor is connected with the rotary heat exchanger in a return mode, and the denitration reactor is provided with an ammonia water adding system.
Preferably, the ammonia water adding system comprises an ammonia water tank, an ammonia water pump and an ammonia water evaporator which are connected in sequence, and the discharge end of the ammonia water evaporator is connected with the feed inlet of the denitration reactor.
Preferably, the ammonia water evaporator is provided with a dilution fan, and a feed inlet of the dilution fan is connected with a discharge outlet of the denitration reactor.
Preferably, the SDS dry desulphurization system comprises a baking soda powder bin, a grinder is connected with the baking soda powder bin, and a conveying fan is connected with the grinder.
Preferably, a flue reactor for mixing baking soda and lime kiln flue gas is arranged between the conveying fan and the bag-type dust collector.
The utility model has the advantages that:
the device meets the treatment requirement of lime kiln flue gas treatment, the flue gas reaches the ultralow emission index, and the atmospheric environment quality is promoted to be effectively improved.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic view of the overall structure of the present invention;
in the figure, the device comprises a baking soda powder bin 1, a baking soda powder bin 2, a grinder 3, a conveying fan 4, a flue reactor 5, a bag-type dust remover 6, an induced draft fan 7, a denitration reactor 8, a rotary heat exchanger 9, an ammonia water tank 10, an ammonia water evaporator 11, an ammonia water pump 12 and a heating furnace.
Detailed Description
The technical solutions in the embodiments of the present application will be described clearly and completely with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present application without making any creative effort, shall fall within the protection scope of the present application.
In the description of the present invention, it should be understood that the terms "inside", "outside", "left" and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention.
The utility model discloses a lime kiln furnace flue gas ultralow emission processing apparatus as shown in figure 1, the device carries out the treatment flow that ultralow emission was handled to lime kiln furnace flue gas and does: sodium bicarbonate dry desulfurization system (SDS) → bag dust collector 5 → rotary heat exchanger 8 → heating furnace 7 → denitration reactor 7 → rotary heat exchanger 8 → induced draft fan 6 → chimney discharge.
Baking soda dry desulfurization system: the waste gas (150 ℃) from the lime kiln enters a sodium-based (NaHCO 3) dry desulphurization (SDS) dust removal integrated system. Flue gas firstly enters an SDS desulfurization flue reactor 4, sodium bicarbonate ultrafine powder is sprayed into the reactor, the sodium bicarbonate ultrafine powder is ground by a sodium bicarbonate powder bin 1 through a grinder 2 and then pumped into the reactor 4 through a conveying fan, and in the reactor, the sodium bicarbonate ultrafine powder is decomposed into high-activity sodium carbonate and carbon dioxide under the action of high-temperature flue gas, and Na2CO3 with strong activity and the flue gasSO2 and other acidic media in the flue gas are fully contacted to generate chemical reaction, and are absorbed and purified. The emission concentration of SO2 after treatment reaches 50mg/Nm3The following.
The desulfurized powdery particle product enters a bag-type dust collector 5 along with the air flow to collect dust and a desulfurization byproduct sodium sulfate. The dust remover adopts a low-pressure pulse bag type dust remover, the dust remover adopts a special superfine fiber filter bag, and the filter material adopts PPS + PTFE high-quality filter material. The dust emission concentration after treatment reaches 10mg/Nm3The following.
The flue gas after desulfurization and dust removal needs to be subjected to denitration treatment, the flue gas needs to be heated to the temperature of low-temperature SCR reaction (about 220 ℃) due to low temperature (about 120 ℃), and the heating mode adopts a mode of configuring the heating furnace 12 for the rotary heat exchanger.
The rotary heat exchanger transfers heat in a regeneration mode, and hot flue gas after denitration and cold flue gas before denitration alternately flow through the heating surface. When the flue gas flows through, the heat of the denitrated hot flue gas is transferred to the heating surface, the temperature of the heating surface is increased, and the heat storage capacity is accumulated; when the cold flue gas flows through before denitration, the heat accumulated by the heating surface is released to the cold flue gas before denitration.
The heating furnace system is characterized in that after fuel gas is fully combusted in the heating furnace through the combustor, hot air with the temperature of 800-1100 ℃ is formed and is mixed with a large amount of low-temperature flue gas in the flue. The low-temperature flue gas in the flue during initial operation is heated from 120 ℃ to about 220 ℃ so as to reach the temperature index required by denitration. After the denitration system runs stably, the temperature of the heating furnace system to be heated is very low due to the operation of the rotary heat exchanger, and only a small amount of fuel gas needs to be consumed.
The denitration system adopts a Selective Catalytic Reduction (SCR) denitration process, the catalyst adopts a low-temperature honeycomb catalyst, and the reducing agent (ammonia water) is utilized to selectively reduce NOx in the flue gas to generate N2And H2O, the emission concentration of nitrogen oxides in the flue gas treated by the SCR reactor reaches 100mg/Nm3The following. Ammonia water is provided by an ammonia water tank 9, the ammonia water in the ammonia water tank enters an ammonia water evaporator 10 under the pressurization action of an ammonia water pump 11, the ammonia water evaporator is provided with a dilution fan, and the dilution fan reactsAnd (2) feeding part of denitrated flue gas into an ammonia water evaporator, evaporating ammonia water by using the heat of the part of flue gas, then feeding the ammonia water into the denitration reactor again, reducing the temperature (220 ℃) of the flue gas after the reactor to below 140 ℃ after heat exchange through a rotary heat exchanger, and discharging the flue gas into a chimney by an induced draft fan 6.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (5)
1. The ultra-low emission treatment device for the lime kiln flue gas is characterized by comprising an SDS dry desulfurization system, a bag-type dust remover, an SCR low-temperature denitration system and an induced draft fan which are sequentially arranged according to the technological process; the SCR low-temperature denitration system comprises a rotary heat exchanger connected with a bag-type dust collector, the rotary heat exchanger is connected with a heating furnace, the heating furnace is connected with a denitration reactor, the denitration reactor is connected with the rotary heat exchanger in a return mode, and the denitration reactor is provided with an ammonia water adding system.
2. The ultra-low emission treatment device for the lime kiln flue gas as recited in claim 1, wherein the ammonia water feeding system comprises an ammonia water tank, an ammonia water pump and an ammonia water evaporator which are connected in sequence, and a discharge end of the ammonia water evaporator is connected with a feed inlet of the denitration reactor.
3. The lime kiln furnace flue gas ultra-low emission treatment device as claimed in claim 2, wherein the ammonia water evaporator is provided with a dilution fan, and a feed inlet of the dilution fan is connected with a discharge outlet of the denitration reactor.
4. The lime kiln furnace flue gas ultra-low emission treatment device according to claim 1, wherein the SDS dry desulphurization system comprises a baking soda bin, a grinder is connected to the baking soda bin, and a conveying fan is connected to the grinder.
5. The ultra-low emission treatment device for the lime kiln furnace flue gas as claimed in claim 4, wherein a mixer for mixing the baking soda and the lime kiln flue gas is arranged between the conveying fan and the bag-type dust remover.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115582016A (en) * | 2022-11-08 | 2023-01-10 | 山东万达环保科技有限公司 | Special ultralow-temperature desulfurization and denitrification process for lime kiln |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115582016A (en) * | 2022-11-08 | 2023-01-10 | 山东万达环保科技有限公司 | Special ultralow-temperature desulfurization and denitrification process for lime kiln |
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Denomination of utility model: An ultra-low emission treatment device for lime kiln flue gas Effective date of registration: 20230227 Granted publication date: 20210202 Pledgee: Branches of Jinan Rural Commercial Bank Co.,Ltd. Pledgor: SHANDONG QINGSHUO ENVIRONMENTAL SCIENCE AND TECHNOLOGY CO.,LTD. Registration number: Y2023980033548 |