CN215842321U - Device for ultralow emission reconstruction of coal-fired boiler - Google Patents
Device for ultralow emission reconstruction of coal-fired boiler Download PDFInfo
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- CN215842321U CN215842321U CN202121474861.5U CN202121474861U CN215842321U CN 215842321 U CN215842321 U CN 215842321U CN 202121474861 U CN202121474861 U CN 202121474861U CN 215842321 U CN215842321 U CN 215842321U
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Abstract
The utility model disclosesThe device for the ultralow emission modification of the coal-fired boiler comprises a multi-tube dust remover, a bag-type dust remover, an ozone generator, a desulfurizing tower and a high-efficiency vortex demister; the entry end and the flue gas discharge pipe of multi-tube dust remover are connected, and the exit end of multi-tube dust remover is connected to the entry end of sack cleaner, the exit end of sack cleaner is connected to the entry end of desulfurizing tower, the waste liquid exit linkage in desulfurizing tower bottom is to alkali lye collecting pit, the exhanst gas outlet linkage in desulfurizing tower top is to the entry of high-efficient vortex defroster, ozone generator connects on the flue between sack cleaner and desulfurizing tower, the inside of desulfurizing tower sets up the box, the box divide into four regions that communicate in proper order with the desulfurizing tower inner space, and four regional middle smoke flow directions that communicate in proper order are downwards, upwards, downwards, upwards respectively. The utility model can lead the smoke dust and SO in the smoke of the coal-fired boiler2、NOxThe stable discharge after reaching the standard.
Description
Technical Field
The utility model belongs to the field of ultralow emission modification, and particularly relates to a device for ultralow emission modification of a coal-fired boiler.
Background
The ultra-low emission reconstruction technology of the coal-fired boiler is to complete SO emitted by the coal-fired boiler through technical reconstruction2And NOx, smoke dust and other pollutants to meet corresponding standards. Known as SO2Is the main cause of acid rain; NO and NO in NOx2Finally, nitric acid and nitrate particles are generated, and the fine particle pollution and dust haze phenomena in the atmosphere are aggravated. NOx may react with O3The reaction destroys the ozone layer in the stratosphere, so that the ultraviolet radiation shielding is lost; the emission of the smoke dust is easy to increase the content of pm10, pm2.5 and other particles in the air, and the particles in the air also provide carriers for photochemical reaction and the like, so that the air pollution is increased. When HNO3、SO2In the presence of dust, more toxic aerosol of the acid salt is produced by reaction, and NOx can form photochemical smog with hydrocarbon, causing harm to human beings, animals and plants. Therefore, the ultra-low emission reconstruction of the coal-fired boiler has important significance for protecting the environment.
At the present stage, due to the problems that the contact time of the desulfurization liquid and sulfur dioxide is short, the droplets of the desulfurization waste liquid are entrained, ammonia is escaped in the ammonia process denitration, the service life of a cloth bag is influenced by the high temperature of the flue gas, and the like, the flue gas treatment of the coal-fired boiler has many problems.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problems in the background art, the utility model provides a device for ultralow emission modification of a coal-fired boiler, which can ensure that smoke dust and SO in the flue gas of the coal-fired boiler2、NOxThe stable discharge after reaching the standard.
In order to achieve the purpose, the utility model adopts the following technical scheme:
a device for coal-fired boiler ultra-low emission reconstruction comprises a multi-tube dust collector, a bag-type dust collector, an ozone generator, a desulfurizing tower and a high-efficiency vortex demister;
the entry end and the flue gas discharge pipe of multi-tube dust remover are connected, the exit end of multi-tube dust remover is connected to the entry end of sack cleaner, the exit end of sack cleaner is connected to the entry end of desulfurizing tower, the waste liquid exit linkage in desulfurizing tower bottom is to alkali lye collecting pit, the exhanst gas outlet linkage in desulfurizing tower top is to the entry of high-efficient vortex defroster, ozone generator connects on the flue between sack cleaner and desulfurizing tower, the inside of desulfurizing tower sets up the box, the box divide into four regions that communicate in proper order with the desulfurizing tower inner space, and four regions that communicate in proper order in the flue gas flow direction be downwards, upwards, downwards, upwards respectively.
Further, the inside of the multi-tube dust collector is provided with the cyclone.
Further, the cloth bag used by the cloth bag dust remover adopts a PTFE film-coated filter bag.
Further, an ozone nozzle and a flue gas flow sensor are arranged on a flue between the bag-type dust collector and the desulfurizing tower, the ozone nozzle is connected with an ozone generator, and the ozone generator adjusts the ozone generation amount through data of the flue gas flow sensor.
Furthermore, the sizes of four sequentially communicated areas in the desulfurizing tower are consistent, and the cross section of the inner space of the desulfurizing tower is shaped like a Chinese character 'tian'.
Furthermore, two layers of alkali liquor nozzles are arranged in each area inside the desulfurizing tower, and the flow direction of flue gas in each area is opposite to the spray flow direction of the alkali liquor nozzles.
Further, the alkali liquor nozzle adopts a high-efficiency atomizing nozzle.
Further, the alkali liquor nozzle is connected to an alkali liquor collecting tank through a pipeline, and the alkali liquor collecting tank is connected to an alkali tank.
Further, the lower part of desulfurizing tower is provided with the pH monitor probe that is used for monitoring inside alkali lye pH value of desulfurizing tower, and the exit end of alkali jar is connected to the alkali lye collecting pit through automatic alkali adding device, and automatic alkali adding device passes through the pH value automatic completion alkali supplementing process that pH monitor probe surveyed.
Further, an aeration head is arranged in the alkali liquor collecting tank.
Compared with the prior art, the utility model has the following beneficial technical effects:
the utility model mainly aims at three aspects of dust removal, denitration and desulfurization: in the aspect of dust removal, a multi-tube dust remover and a bag-type dust remover are used in a combined manner to achieve the purpose of removing smoke dust in the smoke; in the aspect of denitration, an ozone generator is arranged, and NOx in the flue gas is completely oxidized into NO by ozone2、N2O5Then, the wastewater enters a desulfurizing tower, reacts with alkali liquor in the desulfurizing tower to generate nitrate, and the nitrate is subjected to denitrification reaction in the inner diameter of the sewage station to generate nitrogen for removal; in the aspect of desulfurization, a desulfurization tower is divided into cells, flue gas sequentially enters four regions, and reacts with alkali liquor in the desulfurization tower to generate nitrate, and the nitrate is subjected to denitrification reaction in the inner diameter of a sewage station to generate nitrogen for removal. In conclusion, the utility model can realize the aim of smoke dust and SO2The NOx removal efficiency is stable, the boiler flue gas is guaranteed to meet the ultralow emission standard, and the contact time of the flue gas and the desulfurization liquid can be prolonged by the grids and the flue gas trend in the desulfurization tower, so that the removal efficiency is improved.
Furthermore, the cloth bag in the cloth bag dust remover adopts a PTFE film-coated cloth bag, so that the problems of short service life of the cloth bag and frequent maintenance of a dust removal system caused by overhigh smoke temperature can be well solved.
Further, the ozone generator adjusts the ozone production amount according to the data of the flue gas flow sensor, and completes the oxidation of NOx in the flue gas before the flue gas enters the desulfurizing tower to generate NO2、N2O5A small excess of ozone may be reacted with SO2Reaction to form SO3。
Further, the flue gas is denitrified and then is desulfurized and NO is treated by four steps of downward-upward-downward-upward2The removal reaction of (1). Wherein, in the desulfurizing tower, two layers of alkali liquor nozzles are arranged in each grid, and the nozzles adopt high-efficiency atomizing nozzles for removing SO2Meanwhile, the smoke dust is further captured by means of the good atomization effect of the efficient atomization nozzle, the liquid spraying direction is opposite to the smoke gas direction, the contact time of the smoke gas and alkali liquor is prolonged in a four-grid series mode, the reaction efficiency is improved, and the efficient vortex demister is arranged at the outlet of the last grid of the desulfurization tower, so that the desulfurization waste liquid drops in the smoke gas are preliminarily removed; an automatic alkali adding device is arranged in an alkali liquor collecting pool at the lower end of the desulfurizing tower, the alkali supplementing process is automatically completed according to the change of the pH value of the desulfurizing liquid, single-tower single control is realized, the efficiency is high, and the pertinence is strong.
Further, waste liquid discharged from the desulfurization system is aerated by arranging an aeration head, and Ca (OH) is added2Removal of SO by production of calcium sulfate solids4 2-The purpose of (1).
Further, the desulfurizing tower export links to each other with high-efficient vortex defroster import, and the salt content that the desulfurated droplet of alkali method smugglied leads to the fact the smoke and dust to exceed standard to the flue gas treatment of coal fired boiler is very big puzzlement always, through install high-efficient vortex defroster additional in the desulfurizing tower export, realizes the entrapment to liquid drop in the flue gas, has greatly reduced the content of salt in the flue gas, has realized the stable discharge to reach standard of smoke and dust.
Drawings
The accompanying drawings are included to provide a further understanding of the utility model, and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model and not to limit the utility model.
FIG. 1 is a schematic view of an apparatus for ultra-low emission abatement of flue gas from a coal-fired boiler provided in an embodiment of the present invention;
in the figure, 1. a multi-tube dust collector; 2. a bag-type dust collector; 3. an ozone generator; 4. a desulfurizing tower; 5. high-efficient vortex defroster.
Fig. 2 is a schematic view of the internal structure of a desulfurizing tower provided in the embodiment of the present invention.
Detailed Description
The utility model is described in further detail below with reference to the following figures and specific examples:
in order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the utility model described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Referring to fig. 1, a device for ultra-low emission modification of a coal-fired boiler comprises a multi-tube dust collector 1, a bag-type dust collector 2, an ozone generator 3, a desulfurizing tower 4 and a high-efficiency vortex demister 5; the exit end of multi-tube dust remover 1 is connected to the entry end of sack cleaner 2, the exit end of sack cleaner 2 is connected to the entry end of desulfurizing tower 4, the waste liquid exit linkage in desulfurizing tower 4 bottom is to alkali lye collecting pit, the exhanst gas outlet at 4 tops of desulfurizing tower is connected to the entry of high-efficient vortex defroster 5, ozone generator 3 is connected on the flue between sack cleaner 2 and desulfurizing tower 4.
The multi-tube dust collector is characterized in that cyclones are arranged inside the multi-tube dust collector 1, PTFE (polytetrafluoroethylene) film filter bags, pulse valves and a back-blowing pipeline are arranged inside the bag-type dust collector 2, the back-blowing pipeline is multiple, the PTFE film filter bags are controlled to be back-blown through the pulse valves, grids are arranged in the desulfurizing tower 4, the desulfurizing tower 4 is divided into four grids shaped like a Chinese character 'tian', so that the space in the desulfurizing tower 4 is divided into 4 sequentially communicated areas, and the 4 sequentially communicated areas complete desulfurization and NO (nitric oxide) desulfurization in four steps of downward-upward-downward-upward2The removing reaction is carried out, each area is provided with two layers of alkali liquor nozzles, the liquid spraying direction of the alkali liquor nozzles in each area is opposite to the smoke flow direction, and the alkali liquor nozzles adopt high-efficiency atomizing nozzles.
Referring to fig. 2, flue gas entering the desulfurizing tower 4 firstly flows downwards through the left front area, alkali liquor is sprayed upwards by the alkali liquor nozzles in the left front area to desulfurize the flue gas, then the flue gas enters the left rear area through the lower connecting channel to flow upwards, alkali liquor is sprayed downwards by the alkali liquor nozzles in the left rear area to desulfurize the flue gas, then the flue gas flows downwards through the upper connecting channel entering the right rear area, the flue gas is desulfurized through the alkali liquor nozzles in the right rear area to spray upwards, then the flue gas enters the right front area through the lower connecting channel to flow upwards, alkali liquor is sprayed downwards in the right front area to desulfurize the flue gas, and finally the flue gas enters the high-efficiency vortex demister 5.
An ozone nozzle and a flue gas flow sensor are arranged on a flue between the bag-type dust collector 2 and the desulfurizing tower 4, the ozone nozzle is connected with the ozone generator 3, and the flue gas flow sensor is linked with the ozone generator 3 and can adjust the ozone production amount according to the flue gas flow.
The alkali liquor nozzle is connected to the alkali liquor collecting tank through a pipeline, and the alkali liquorThe collecting pit is connected to alkali jar, the lower part of desulfurizing tower 4 is provided with the pH monitor that is used for monitoring inside alkali lye pH value of desulfurizing tower 4, and the exit end of alkali jar is connected to alkali lye collecting pit through automatic alkali adding device, and automatic alkali adding device passes through pH monitor and surveys the pH value and accomplish the alkali process of benefit automatically, install the aeration head in the alkali lye collecting pit to with SO3 2-Oxidation to SO4 2-In CaSO4By precipitation of SO2And removed from the system.
The ultra-low emission modification of the coal-fired boiler mainly aims at three aspects of dust removal, denitration and desulfurization: in the aspect of dust removal, a multi-tube dust remover 1 and a bag-type dust remover 2 are used in a combined manner to achieve the purpose of removing smoke dust in the smoke; in the aspect of denitration, an ozone generator 3 is arranged, NOx in the flue gas is completely oxidized into NO through an ozone nozzle in a flue2、N2O5Then, the wastewater enters a desulfurizing tower 4, and reacts with alkali liquor in the desulfurizing tower 4 to generate nitrate, and the nitrate is subjected to denitrification reaction in the inner diameter of the sewage station to generate nitrogen for removal; in the aspect of desulfurization, the desulfurizing tower 4 is divided into cells, the flue gas sequentially enters four areas, the direction of an alkali liquor nozzle is opposite to the flow direction of the flue gas, the contact time of the flue gas and a desulfurizing liquid is prolonged, NaOH solution is adopted for desulfurization, and SO is removed2Meanwhile, the smoke dust is further captured by means of the good atomization effect of the high-efficiency atomization nozzle; aerating the waste liquid discharged from the desulfurization system, and adding Ca (OH)2Removal of SO by production of calcium sulfate solids4 2-The purpose of (1). In the prior dual-alkali desulfurization process, salt carried by spray is the main problem of overproof smoke dust at an outlet, so that the utility model is additionally provided with the high-efficiency vortex demister 5 at the outlet of the desulfurization tower, and the salt in the desulfurization waste liquid can be collected. In conclusion, the utility model can realize the aim of smoke dust and SO2The NOx removal efficiency is stable, the boiler flue gas is guaranteed to meet the ultralow emission standard, and the contact time of the flue gas and the desulfurization liquid can be prolonged by the grids and the flue gas trend in the desulfurization tower, so that the removal efficiency is improved.
The above-mentioned contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical idea of the present invention falls within the protection scope of the claims of the present invention.
Claims (10)
1. A device for ultra-low emission reconstruction of a coal-fired boiler is characterized by comprising a multi-tube dust collector (1), a bag-type dust collector (2), an ozone generator (3), a desulfurizing tower (4) and a high-efficiency vortex demister (5);
the entry end and the flue gas discharge pipe of multi-tube dust remover (1) are connected, the exit end of multi-tube dust remover (1) is connected to the entry end of sack cleaner (2), the exit end of sack cleaner (2) is connected to the entry end of desulfurizing tower (4), the waste liquid exit linkage to alkali lye collecting pit of desulfurizing tower (4) bottom, the exhanst gas outlet at desulfurizing tower (4) top is connected to the entry of high-efficient vortex defroster (5), ozone generator (3) are connected on the flue between sack cleaner (2) and desulfurizing tower (4), the inside of desulfurizing tower (4) sets up the box, the box divide into four regions that communicate in proper order with desulfurizing tower (4) inner space, and four regions that communicate in proper order in the flue gas flow direction respectively be downwards, upwards, downwards, upwards.
2. The device for ultra-low emission modification of coal-fired boiler according to claim 1, characterized in that the inside of the multi-tube dust collector (1) is equipped with cyclone.
3. The device for the ultra-low emission reconstruction of the coal-fired boiler according to the claim 1, characterized in that the cloth bag used by the cloth bag dust remover (2) adopts a PTFE membrane filter bag.
4. The device for the ultralow emission modification of the coal-fired boiler according to claim 1, wherein an ozone nozzle and a flue gas flow sensor are arranged on a flue between the bag-type dust collector (2) and the desulfurizing tower (4), the ozone nozzle is connected with the ozone generator (3), and the ozone generator (3) adjusts the ozone production amount according to data of the flue gas flow sensor.
5. The device for the ultralow emission modification of the coal-fired boiler according to claim 1, wherein four sequentially communicated regions inside the desulfurizing tower (4) are uniform in size, and the cross section of the inner space of the desulfurizing tower (4) is shaped like a Chinese character tian.
6. The device for the ultra-low emission modification of the coal-fired boiler as recited in claim 5, wherein two layers of lye nozzles are arranged in each zone inside the desulfurization tower (4), and the flow direction of the flue gas in each zone is opposite to the flow direction of the spray liquid from the lye nozzles.
7. The apparatus of claim 6, wherein the alkali liquor nozzle is an efficient atomizing nozzle.
8. The apparatus of claim 6, wherein the lye nozzles are connected by a pipeline to a lye collection tank which is connected to a lye tank.
9. The device for ultralow emission modification of a coal-fired boiler according to claim 8, wherein a pH monitoring probe for monitoring the pH value of alkali liquor inside the desulfurizing tower (4) is arranged at the lower part of the desulfurizing tower (4), the outlet end of the alkali tank is connected to the alkali liquor collecting tank through an automatic alkali adding device, and the automatic alkali adding device automatically completes the alkali supplement process through the pH value measured by the pH monitoring probe.
10. The apparatus of claim 1, wherein an aeration head is installed in the lye collection tank.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202121474861.5U CN215842321U (en) | 2021-06-29 | 2021-06-29 | Device for ultralow emission reconstruction of coal-fired boiler |
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| CN202121474861.5U CN215842321U (en) | 2021-06-29 | 2021-06-29 | Device for ultralow emission reconstruction of coal-fired boiler |
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| CN215842321U true CN215842321U (en) | 2022-02-18 |
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| CN202121474861.5U Active CN215842321U (en) | 2021-06-29 | 2021-06-29 | Device for ultralow emission reconstruction of coal-fired boiler |
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Address after: 264006 Heilongjiang Road, Yantai economic and Technological Development Zone, Shandong 10 Patentee after: Taihe New Material Group Co.,Ltd. Address before: 264006 Heilongjiang Road, Yantai economic and Technological Development Zone, Shandong 10 Patentee before: YANTAI TAYHO ADVANCED MATERIALS Co.,Ltd. |