CN210021565U - Clean air treatment system suitable for zero release dry separation system - Google Patents

Abstract

The utility model provides a clean wind processing system suitable for zero release dry separation system, its damp and hot gas that contains the dust after being used for dry separation that the dry separation system produced carries out a series of dust removal purification, clean wind processing system includes gravity settling dust remover, sack cleaner and the clean wind pipeline of 1# that gravity settling filter is used for cleaing away large granule impurity and filters, and the sack cleaner is used for filtering the dust of less granularity, and gravity settling dust remover setting is preceding at the sack cleaner. The dust removal device can purify and remove dust-containing gas to the maximum extent, further reduce pollution to the surrounding environment, further improve dry separation efficiency and reduce energy consumption ratio.

Description

Clean air treatment system suitable for zero release dry separation system

Technical Field

The utility model belongs to the technical field of coal dry separation equipment, concretely relates to clean wind processing system suitable for zero release dry separation system, it is applicable to in the material dry separation technique of zero pollutant discharge.

Background

Coal is a main energy source in China, reaches more than 60% in the production and consumption structure of primary energy, and has an important supporting function on the high-speed development of economy in China. At present, most raw coal in China is directly combusted without being subjected to clean separation processing, so that very serious environmental pollution and resource waste are caused. Coal dressing is the basis of clean utilization technology of coal and is one of key technologies for realizing energy conservation and emission reduction. For a long time, the theory and the method of coal wet separation are the foundation of the development of the leading coal separation technology, but the coal recoverable reserves of China are more than 2/3 distributed in arid water-deficient areas such as northwest, the traditional wet separation method with large water consumption is difficult to adopt, the clean utilization of coal separation is restricted, and the research on the key technology of high-efficiency dry coal separation is urgent.

The coal dry separation process is widely applied to the coal upgrading industry at present, resources can be fully utilized, the coal quality and the coal utilization rate can be improved, the environment pollution caused by raw coal utilization is reduced, the coal transportation cost is reduced, and the purposes of energy conservation and emission reduction are achieved. However, the coal dry separation process inevitably uses wind power to separate coal, and in the implementation process, the coal dry separation process inevitably discharges mixed gas flow or waste gas flow mixed with dust or coal particles into the atmosphere, so that certain influence on the surrounding environment is caused.

With the requirement on environmental cleanness, how to solve the problem of pollution reduction of the coal dry separation process inevitably comes to the counter of research developers. At present, the technology capable of thoroughly treating the mixed gas flow or the waste gas flow discharged into the atmosphere only adds complex systems or technologies such as dust removal and the like after the coal preparation process, but the complex dust removal process operates as an independent system, and the operation not only needs to consume energy, but also inevitably needs to increase the great production cost and also needs to increase the occupied production space or area. Therefore, thoroughly solving the problem of pollution reduction in the coal dry separation process is always an urgent problem to be solved by coal developers.

SUMMERY OF THE UTILITY MODEL

In order to solve the above defects, the applicant provides a clean air treatment system suitable for a zero-emission dry separation system through multiple designs and researches, and the clean air treatment system is used as a main component of the zero-emission dry separation system, can purify and remove dust-containing gas to the maximum extent, further reduces pollution to the surrounding environment, further improves the dry separation efficiency, and reduces the energy consumption ratio.

According to the technical scheme of the utility model, a clean wind processing system suitable for zero release dry separation system is provided, its damp and hot gas that contains the dust that is used for after the dry separation that will dry separation system produced carries out a series of dust removal purification treatment, clean wind processing system includes that gravity subsides dust remover, sack cleaner and the clean wind pipeline of 1#, and gravity subsides the filter and is used for cleaing away large granule impurity and filters, and the sack cleaner is used for filtering the dust of less granularity, and gravity subsides the dust remover setting in front of the sack cleaner.

Further, the first air outlet 305 of the gravity settling dust collector 3 is connected with an air inlet of the bag-type dust collector 4 arranged at the middle lower part of the bag-type dust collector 4, and an air outlet of the bag-type dust collector 4 arranged at the upper part of the bag-type dust collector 4 passes through a # 1 clean air pipeline 7. Preferably, a plurality of groups of clean air treatment systems connected in series are arranged in the zero-emission dry separation system according to the field requirement.

Further, the gravity settling filter in the clean air treatment system comprises an inlet air expansion reducing pipe 301, a filter shell 302, a filter collecting taper pipe 303, a spiral diversion baffle 304 and a first air outlet 305.

Preferably, the air inlet expansion diameter-changing 301 of the gravity settling filter is arranged at the upper part of the gravity settling filter, the lower part of the gravity settling filter is connected with the filter housing 302, the lower part of the filter housing 302 is connected with the filter collecting taper pipe 303, and the air inlet expansion diameter-changing 301, the filter housing 302 and the filter collecting taper pipe 303 are kept on the same central axis, that is, the central axes of the three are the same.

Preferably, a spiral deflector 304 is provided on the inner wall of the filter housing 302. The first outlet 305 is provided at the lower part of the filter case 302, and is preferably provided at a position 1/4 to 1/6 of the filter case. The heating grid is arranged at the joint of the air inlet expansion reducing pipe 301 and the filter shell 302, the heating grid is perpendicular to the central axis of the filter shell 302, and the periphery of the heating grid is connected with the filter shell 302.

Preferably, the spiral flow guide baffle 304 disposed along the inner wall of the filter housing 302 has a certain height, and the spiral flow guide baffle 304 and the inner wall of the filter housing 302 form an included angle of 30 ° to 60 ° and are disposed in a downward inclined manner, and are spirally and rotatably arranged downward along the inner ring of the filter housing 302.

More preferably, the flow guide baffles 304 are intermittently disposed on the inner wall of the filter housing 302, and a plurality of intermittently disposed flow guide baffles 304 are relatively staggered on the inner wall of the filter housing 302.

The utility model discloses a clean wind processing system compares with prior art, the utility model discloses a have following advantage:

1. the system is suitable for a zero-emission dry separation system, a dust removal and purification link in a closed circulation system is formed in the zero-emission pollution system, and working gas continuously does work in the closed circulation to obtain heat and keep the temperature.

2. The linkage of the multistage purifying equipment between the gravity settling filter and the bag-type dust remover greatly improves the working efficiency of gas purification and reduces the generation cost.

3. The utility model discloses a clean wind processing system produces certain heat because of gas pressure difference and dust particle friction and collision in dust removal and filtration process, and then has promoted working gas's temperature, provides certain prerequisite basis for subsequent dehumidification dewetting, and it has further reduced manufacturing cost.

4. The clean air treatment system can be combined in a module mode and can flexibly meet the requirements of field production.

Drawings

Fig. 1 is a schematic structural view of a zero-emission dry separation system suitable for use in accordance with the present invention;

FIG. 2 is a schematic diagram of the operating principle of the gravity settler shown in FIG. 1;

FIG. 3 is a schematic structural view of the condensate collector shown in FIG. 1;

FIG. 4 is a schematic diagram of the inertial filter of FIG. 1 in terms of its operation and construction;

FIG. 5 is a schematic diagram of a modification of the system of FIG. 1;

figure 6 is a schematic diagram of a modification to the gravity settler shown in figure 2.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention. Additionally, the scope of the present invention should not be limited to the particular structures or components described below or to the particular parameters.

The utility model provides a clean wind processing system is the important component part of zero release dry separation system and dry separation technology, and the wet hot gas that contains the dust after the dry separation that the zero release dry separation technique will produce the dry separation system carries out closed loop processing such as a series of dust removals, purification, dehumidification, and dust removal purification is after the clean gas, and reverse supply gives the dry separation system, and then realizes the zero pollution emission to the environment. After the zero-emission dry separation system is miniaturized, the system can be applied to the underground environment, and firstly, because the system hardly discharges polluted gas into the working environment, the damage to the working environment is reduced to zero; and secondly, the coal gangue is directly backfilled in the hollowed area, so that the transportation cost of the coal gangue and the cost of backfilling the hollowed area are reduced.

The utility model discloses the zero release dry separation system that is suitable for mainly includes host computer closing body, gravity subside dust remover, sack cleaner and condensate collector, and wherein the host computer closing body is used for sealing the dry separation system in an airtight space, and the gravity subsides filter is used for cleaing away the filtration with large granule impurity, and the sack cleaner is used for filtering the dust of less granularity, and the condensate collector is used for reducing the moisture in the humid air stream; the main machine closing body, the gravity settling dust collector, the bag-type dust collector and the condensed water collector are connected in sequence. It is emphasized that the gravity settling dust remover, the bag-type dust remover and the condensed water collector are sequentially connected, and when the air flow sequentially passes through the gravity settling dust remover and the bag-type dust remover, a certain temperature rise is generated, and the temperature rise generated in the treatment of the former device is used as the basis of the subsequent treatment; namely, the temperature rise of the dust airflow generated by particle collision in the gravity settling dust collector is beneficial to the treatment effect of the dust airflow in the bag-type dust collector, namely, the maximum treatment of the dust airflow in the bag-type dust collector is ensured, and almost all dust is absorbed and collected in the bag-type dust collector; the temperature of the dust airflow is raised in the bag-type dust collector, which is beneficial to the vaporization and condensation of the semi-clean airflow in the condensed water collector. Further, according to the field production needs, a clean air pipeline, an automatic opening and closing valve, an exhaust diffuser, an inertial filter or a sensor can be optionally added. The self-circulation closed circulation system realizes automatic flow by utilizing the air flow pressure difference and the temperature difference in the closed system; in order to further enhance the working power, a dust remover induced draft fan can be arranged, so that the flow of gas in the closed circulating body can be increased conveniently.

In more detail, the zero-emission dry separation system shown in fig. 1 includes a main machine enclosure 1, a return air duct 2, a gravity settling dust collector 3, a bag-type dust collector 4, a dust collector induced draft fan 5, a condensed water collector 6, a 1# clean air duct 7, a 2# clean air duct 8, an automatic on-off valve 9, an exhaust diffuser 10, an inertial filter 11, a sensor 12 and a dust removal duct 13. The main machine closing body 1 is connected with the inlet of the gravity settling dust remover 3 through a dust removing pipeline 13; optionally, the dust removal pipeline 13 is directly connected with a dust gas outlet of the dry separation system, and a monitoring sensing system is arranged at the connection position of the dust removal pipeline 13 and the dust gas outlet of the dry separation system to monitor dust concentration, gas pressure or/and gas pressure and gas flow rate, so as to regulate and control the circulation speed and purification power of the zero-emission dry separation system in a real-time remote or short-range manner; or the dust removal pipeline 13 is only connected with the main machine enclosure 1, at the moment, the dry separation system forms a production area of a closed space in the main machine enclosure 1, and at the moment, a dust monitoring system is arranged in the production area to remotely and closely regulate and control the circulation speed and the purification power of the zero-emission dry separation system in real time. The first air outlet 305 of the gravity settling dust collector 3 is connected with an air inlet of a bag-type dust collector 4 arranged at the middle lower part of the bag-type dust collector 4, an air outlet of the bag-type dust collector 4 arranged at the upper part of the bag-type dust collector 4 is connected with an induced air duct opening of a dust collector induced draft fan 5 through a No. 1 clean air duct 7, an air outlet of the dust collector induced draft fan 5 is connected with a second air inlet 601 of a condensed water collector, and hot gas after being dehumidified and dehumidified by the condensed water collector 6 sequentially passes through a No. 2 clean air duct 8 and an inertial filter 11 and then enters a dry separation host closed body through. Alternatively, the clean air stream may be directed into the main enclosure where the air inlet system of the dry separation system operates independently to provide the desired inlet air temperature, velocity and pressure for the dry separation system. Alternatively, the return air duct 2 is directly connected to the air inlet system of the dry separation system through the main dry separation machine enclosure, and optionally an air flow pressurizing and/or heating device is arranged in the closed main body at the connection position of the return air duct 2 and the air inlet system of the dry separation system to generate the air flow required by the dry separation system. A sensor 12 for dust concentration and gas pressure is arranged between the inertial filter 11 and the return air duct 2, and the sensor 12 is linked with the automatic closing and opening valve 9 and the dust remover induced draft fan 5. Only when detecting that the dust concentration of gas satisfies the environmental protection requirement and the atmospheric pressure in the host computer obturator is greater than the safe pressure of circulation operation, automatic close-open valve 9 is automatic to be opened, discharges clean environmental protection's gas to external environment through discharging the diffuser. When the dust concentration of the gas does not meet the environment protection, the working pressure of the induced draft fan 5 of the dust remover is increased, the flow of the gas in the closed circulating body is increased, and then the reciprocating times and the filtration times of each dust remover are increased. The induced draft fan 5 is a gas power source provided for the whole set of closed self-circulation airflow.

The main machine closed body is a closed space, the dry separation system is arranged in the closed space, materials to be subjected to dry separation are conveyed into the dry separation system through a closed conveying belt, and then the materials to be subjected to dry separation are conveyed to a feeding port of the dry separation system through a feeding machine. Taking a single-layer sorting bed as an example (composite dry separation equipment can also be used), the materials enter the sorting bed with certain longitudinal and transverse gradients, and a material bed layer with certain thickness is formed on the bed surface. The material at the bottom layer of the bed layer moves to the back plate under the action of the vibration inertia force, and the material is guided by the back plate to turn upwards. The coal with lower density is turned over to the upper layer and slides down along the surface of the bed layer under the action of gravity. Due to the vibration force and the pressure of the materials continuously entering the separation bed, the continuously overturned materials form spiral motion and move to the gangue end. Because the width of the bed surface is gradually reduced, coal with low density slides downwards from the surface, the coal at the lowest layer is continuously discharged through the discharge baffle, and gangue, pyrite and the like with high density are gradually concentrated at the gangue end to be discharged. The bed surface is evenly distributed with a plurality of air holes to ensure that the bed layer is fully loosened. The material will be subjected to a sorting action during each cycle of the cycle. After multiple sorting, various products with ash content from low to high can be obtained.

Further, in the applicable zero-emission dry separation system, when the dry separation system arranged in the host closed body 1 works, fine-particle coal dust in the raw material can be blown up and mixed with air to form dust gas, the dust gas can be sucked into the gravity settling dust collector 3 through the dust collection pipeline 12 by the air flow driven by the draught fan 5, the gravity settling dust collector 3 firstly filters out part of large-particle dust, then the rest dust gas enters the bag-type dust collector 4, and clean gas meeting the environmental protection requirement is discharged through the high-efficiency filtration of the bag-type dust collector 4; the bag-type dust collector 4 adopts multi-order fine pore diameter filtration, and can filter out finer or fine dust particles. After that, the clean gas enters a condensed water collector 6 through a No. 1 clean air pipeline 7, the condensed water collector 6 collects the moisture in the gas, the moisture is sent to an inertia filter 11 through a No. 2 clean air pipeline 8 for further purification and filtration, and the final purified gas is returned to the main machine enclosure 1 through a return air pipeline 2 and is supplied to a main machine of the dry separation system for use. In another embodiment, if the cleanliness and dryness of the gas after passing through the condensate collector 6 are both detected to meet environmental requirements, the filtered gas is directly transported back to the main machine enclosure 1 through the return air duct 2 and supplied to the main machine of the dry separation system for use. In the system, all gas flow processes are completely sealed, no gas is lost, a closed circulation is formed, and no pollution or environmentally-friendly gas is discharged into the air. In the present system, an air path may be further provided in the # 2 clean air duct 8, which communicates with the outside through an automatic open/close valve 9 and is discharged to the ambient environment through a discharge diffuser 10. In another embodiment, the zero-emission dry separation system is a closed circulation system, so that heat preservation measures can be conveniently taken for the zero-emission dry separation system, and the dry separation airflow can be effectively maintained at a certain temperature only by using the working waste heat of the dry separation system without providing excessive or extra energy for heating the dry separation airflow.

In another embodiment of zero emission, the system can also be remotely operated by a central control system or a monitoring system, and the sensor signals arranged on each pipeline are collected to obtain the dust concentration of the automatically detected gas and the air pressure in the host enclosure, when the host enclosure 1 needs negative pressure and the treated gas reaches the emission standard, the automatic open-close valve 9 is opened, and the clean gas is discharged to the atmosphere through the discharge diffuser 10 at the top of the pipeline, so that the work of automatic operation of the whole system is completed.

As shown in fig. 2, the gravity settling filter includes an inlet air volume expansion diameter 301, a filter housing 302, a filter collecting taper pipe 303, a spiral diversion baffle 304, and a first air outlet 305. The density difference between the dust particles and the gas flow is utilized to enable the dust particles and the gas flow to generate relative movement and settle. In order to guarantee the effect of subsiding, the applicant has improved the gravity among the prior art through a lot of experiments, subsides the filter with the through type of the dust removal of general gravity subsides differently, the utility model discloses a speed that the air inlet dilatation reduces the air current. The dust airflow from the dust removal pipeline 13 is injected into an air inlet of the gravity settling filter, the air inlet of the gravity settling filter is an air inlet expansion reducing pipe 301, namely the air inlet expansion reducing pipe 301 is arranged at the upper part of the gravity settling filter and is connected with a filter shell 302 below the gravity settling filter, the filter shell 302 is connected with a filter collecting taper pipe 303 below the filter shell 302, and the air inlet expansion reducing pipe 301, the filter shell 302 and the filter collecting taper pipe 303 are kept on the same central axis, namely the central axes of the three are the same; a spiral diversion baffle 304 is arranged on the inner wall of the filter shell 302 and is used for further reducing the air flow speed; the first air outlet 305 is provided at the lower part of the filter housing 302, preferably at a position 1/4 to 1/6 of the filter housing, and is used for guiding the dust airflow after settling and dust removal to the subsequent bag-type dust collector 4. In order to further enhance the sedimentation effect, a heating grid is arranged at the joint of the air inlet expansion diameter-changing 301 and the filter shell 302 for heating the dust airflow, so that the viscosity of dust particles in the dust airflow is increased and the sedimentation effect is increased. The heating mesh is perpendicular to the central axis of the filter housing 302 and the perimeter of the heating mesh is attached to the filter housing 302.

Further, the spiral flow guide baffle 304 arranged along the inner wall of the filter housing 302 has a certain height, and the spiral flow guide baffle 304 and the inner wall of the filter housing 302 form an included angle of 30-60 degrees and are arranged in a downward inclined manner and are spirally and rotatably arranged downwards along the inner ring of the filter housing 302. Preferably, the baffle 304 may be intermittently disposed on the inner wall of the filter housing 302, a plurality of intermittently disposed baffles 304 are relatively staggered on the inner wall of the filter housing 302, or staggered baffles are overlapped in the vertical projection direction to form a complete speed-reducing retainer. When the dusty airflow enters the gravity settling filter 3 along the arrow direction, the airflow firstly passes through the air inlet expansion reducing pipe 301, when the wind speed is reduced to a certain amount, a plurality of large-particle dust fall off the original track along the spiral guide plate 304, and finally fall into the filter collecting taper pipe 303 to be treated uniformly; in this way, a large part of large dust particles can be filtered out, and the unfiltered dust particles can enter the next stage of bag-type dust collector along the direction of the arrow along with the airflow through the first air outlet 305 for filtering treatment.

The bag-type dust collector is a dry dust collector suitable for collecting fine, dry, non-fibrous dust. The filter bag of the bag-type dust collector is made of woven filter cloth or non-woven felt, the dust-containing gas is filtered by the filtering action of the fiber fabric, when the dust-containing gas enters the bag-type dust collector, the dust with large particles and large specific gravity falls into the dust hopper due to the sedimentation of the gravity, and when the gas containing fine dust passes through the filter material, the dust is blocked, so that the gas is purified. Based on the fact that the dust removal effect of the bag-type dust remover is related to factors such as the temperature, the humidity, the chemical property, the particle size, the dust-containing concentration, the filtering air speed, the dust removal mode and the like of gas, a grid heating device is arranged between the gravity settling dust remover and the bag-type dust remover when necessary and used for improving the dust removal effect of the subsequent bag-type dust remover.

As shown in fig. 3, the condensate collector 6 includes a second air inlet 601, a blowdown valve 602, a condensation grate 603, a condenser tank 604, and a second air outlet 605. The second air inlet 601 is obliquely arranged at the middle lower part of the condenser tank 604, is generally arranged between 1/2-1/6 of the tank body of the condenser tank 604, and is preferably arranged between 1/3-1/4 of the tank body of the condenser tank 604. The condensation grate screen 603 is vertically arranged in the condenser tank 604, and is spaced from the condenser tank 604 by 1cm to 10cm, preferably by 3cm to 7cm, and more preferably by 4cm to 5 cm. The bottom of the condenser tank 604 is provided with a sewage valve 602, and the bottom of the condenser tank 604 is arc-shaped and is convex outwards, so that sewage such as condensed water can be conveniently collected at the concave part of the center. A vertical condenser tank 604 condenser is arranged on the body of the condenser tank 604, the condenser tank 604 condenser is connected with a second air outlet 605 arranged at the upper part of the condensed water collector, and an air channel connected with a third air inlet 1101 of the inertial filter 11 is arranged at the middle upper part of the condenser tank 604.

The nearly clean air flow enters the condenser tank 604 through the second air inlet 601, and the air flow directly impacts a condensation grate screen 603 arranged in the condenser tank 604, the grate screen is made of stainless steel and has a slit structure, the width of a single strip is about 3 mm, the gap between each strip is about 4-5 mm, and the length of the grate screen is about half of the circumference of the condenser tank 604. Under the impact of the high speed of the air flow, some water molecules in the air flow are slowly condensed on the condensation grate screen 603, and when a certain amount is achieved, small water drops are formed, slide down along the condensation grate screen 603 and are discharged out of the tank body through a sewage valve 602 at the bottom of the tank body. The condenser can 604 the condenser may employ a bellows or similar structure that further accelerates the condensation of moisture from the humid gas stream.

Generally, the water vapor content in the air is different according to different regions, and in winter, the water vapor in the air can be frozen to block a bed surface, a pipeline and the like of the dry separation system.

As shown in fig. 4, the inertial filter includes a third air inlet 1101, a filter housing 1102, a cartridge holder 1103, a cartridge 1104, a quick-open access door 1105, and a third air outlet 1106.

The third air inlet 1101 is connected with an air duct of a condenser of the condensate collector, the inside of the third air inlet is connected with a filter core pipe 1104, the filter core pipe 1104 is made of stainless steel fine mesh, is in an annular pipe shape, and is fixed in the filter shell 1102 by using a filter core pipe support 1103. The air current enters into filter core pipe 1104 from third inlet 1101, the tiny sieve mesh of filter core pipe 1104 just makes the resistance of wind increase, the air current will look for the direction that the resistance is little to flow, will spread outside the screen cloth, then some fine dust will glue in filter core pipe 1104, this can filter some fine dust, remaining dusty air current continues to walk in the core pipe the inside, the length of core pipe is very long, the dust in the air current can slowly fall in walking, until gluing on the sieve mesh of core pipe, accomplish the filtration process, finally, through the regular dust of clearing up on the filter core pipe 1104 of quick-open inspection door 1105. The third outlet 1106 of the inertial filter is provided at the end of the inertial filter, to which is connected a sensor 12 (for monitoring the cleanliness and pressure of the airflow entering the host enclosure 1).

As shown in fig. 5, a group of clean air treatment systems is composed of a gravity settling dust collector 3, a bag-type dust collector 4 and a # 1 clean air pipeline, and a plurality of groups of proper clean air treatment systems connected in series can be selected and arranged according to actual needs to purify the working gas with maximum efficiency. Be provided with # 1 monitoring devices on return air pipeline 2, be provided with # 2 monitoring devices in host computer closure 1 upper portion and the position department that is close to dust removal pipeline 13, # 1 monitoring devices is used for monitoring the cleanliness factor of return air, parameters such as temperature and humidity, # 2 monitoring devices is used for monitoring the dust volume of the dust air current of following host computer closure 1 extraction, parameters such as temperature and humidity, the group number that clean wind processing system set up is adjusted according to # 1 monitoring devices and # 2 monitoring devices's data, and adjust the power of draught fan etc. according to # 1 monitoring devices and # 2 monitoring devices's data.

As shown in fig. 6, an ash discharge valve 306 is disposed at the lower part of the bottom end of the gravity settler, and is used for discharging small particles of dust or impurities or materials out of the gravity settler filter; in order to avoid the damage of large-particle materials or impurities to the main body of the equipment caused by rapid sedimentation, a large-aperture screen is arranged at the middle lower part of the gravity sedimentation filter, an ash discharge gate 307 is arranged at the position which is flush with the large-aperture screen or slightly lower than the horizontal plane of the large-aperture screen, and large-particle impurities accumulated on the large-aperture screen are cleaned from the ash discharge gate 307.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the present invention. It will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the following claims.

Claims (10)

1. A clean air treatment system suitable for a zero-emission dry separation system is used for carrying out a series of dust removal and purification treatments on wet and hot gas containing dust generated by the dry separation system after the dry separation, and is characterized in that the clean air treatment system comprises a gravity settling dust collector, a bag-type dust collector and a No. 1 clean air pipeline, the gravity settling filter is used for removing and filtering large-particle impurities, the bag-type dust collector is used for filtering dust with smaller particle size, and the gravity settling dust collector is arranged in front of the bag-type dust collector; the gravity settling filter comprises an air inlet expansion reducing pipe, a filter shell, a filter collecting taper pipe, a spiral flow guide baffle and a first air outlet.

2. The clean air treatment system of claim 1, wherein the first air outlet of the gravity settling dust collector is connected with an air inlet of a bag-type dust collector arranged at the middle lower part of the bag-type dust collector, and an air outlet of the bag-type dust collector arranged at the upper part of the bag-type dust collector passes through a # 1 clean air pipeline.

3. The clean air treatment system of claim 1, wherein a plurality of groups of clean air treatment systems connected in series are arranged in the zero-emission dry separation system according to field requirements.

4. The clean air processing system according to claim 1, wherein the inlet air expansion diameter-changing portion of the gravity settling filter is provided at an upper portion of the gravity settling filter, a lower portion of the gravity settling filter is connected to the filter housing, the filter collecting taper pipe is connected to the lower portion of the filter housing, and the inlet air expansion diameter-changing portion, the filter housing and the filter collecting taper pipe are maintained on a same central axis, that is, central axes of the three portions are the same.

5. The clean air treatment system of claim 1, wherein the first air outlet is disposed at a lower portion of the filter housing.

6. The clean air treatment system of claim 4, wherein a spiral deflector is disposed on an inner wall of the filter housing.

7. The clean air treatment system of claim 1, wherein the first air outlet is disposed at a position 1/4-1/6 of the filter housing.

8. The clean air treatment system of claim 1, wherein a heating grid is arranged at the connection between the inlet air expansion diameter-changing part and the filter shell, the heating grid is perpendicular to the central axis of the filter shell, and the periphery of the heating grid is connected with the filter shell.

9. The clean air treatment system of claim 1, wherein the spiral flow guide baffle arranged along the inner wall of the filter housing has a certain height, and the spiral flow guide baffle and the inner wall of the filter housing form an included angle of 30-60 degrees and are arranged in a downward inclined manner and spirally and rotatably arranged downwards along the inner ring of the filter housing.

10. The clean air treatment system according to claim 1, wherein the guide baffles are intermittently disposed on the inner wall of the filter housing, and the plurality of intermittently disposed guide baffles are alternately disposed on the inner wall of the filter housing.

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