CN111318094A - Dry type dust removal system - Google Patents

Abstract

The invention provides a dry dust removal system which comprises an air inlet pipe, an air outlet pipe, a plurality of dust chambers surrounded by dust discharging assemblies and a carbon steel box body, wherein the air inlet pipe comprises an air inlet main pipe and air inlet branch pipes communicated with each dust chamber, the inner diameter of the air inlet main pipe is gradually reduced along the air inlet direction, a blowing assembly is arranged above each dust chamber, a gas filtering assembly is vertically arranged in each dust chamber, gas to be treated, introduced by the air inlet branch pipes, is filtered by the gas filtering assembly and then is discharged through the air outlet pipe, the blowing assembly and each dust chamber are controlled to be communicated through an independent electromagnetic valve, and dust adsorbed by a cloth bag in the gas filtering assembly is collected and cleaned by the dust discharging assembly arranged at the bottom of the dust chamber under the action of the blowing assembly. According to the invention, the plurality of independent dust chambers are arranged for filtering treatment, so that at least one dust chamber can be kept in normal operation during dust removal, 24-hour uninterrupted operation of matched production can be realized, the diameter of the pipeline is optimized, and the stable gas velocity and the uniform gas inlet amount of each dust chamber can be ensured.

Description

Dry type dust removal system

Technical Field

The invention relates to the technical field of dust removal, in particular to a dry type dust removal system.

Background

This section is intended to provide a background or context to the embodiments of the invention that are recited in the claims. The description herein is not admitted to be prior art by inclusion in this section.

Cloth bag dust removal is a common dry dust filter. The device generally comprises a box body, a bag cage, a cloth bag, a pulse blowing structure and the like, and the device can be used for treating dust-containing waste gas and catching dry and non-fibrous dust through the mutual cooperation of the components. The traditional bag-type dust collector has only one dust removing chamber, the filtering must be stopped when the bag is used for removing dust, the production is influenced, and the traditional bag-type dust collector can not meet the use requirement of purifying exhaust for 24 hours because some production processes are used for exhausting air in 24 hours.

In addition, some industrial waste gas dust particles are extremely fine and reach submicron level, and the conventional cloth bag can not well intercept fine particles, so that the dust removal effect is not ideal. Meanwhile, some waste gas often contains strongly corrosive media such as hydrogen chloride, hydrogen fluoride and the like, so that the waste gas has extremely strong corrosivity on equipment parts and filter bags, an equipment body and the filter bags are extremely easy to corrode and destroy, and particularly, when the waste gas is used for deashing in a cold environment in winter or is shut down for maintenance, the waste gas is easy to dew, so that strong acid liquid is formed, the equipment is corroded more easily, and the maintenance and replacement costs of the equipment are increased. Moreover, the dust condensation easily causes the phenomenon of bag sticking, blocks the cloth bag, reduces the waste gas air quantity and also influences the dust removal effect.

Disclosure of Invention

In view of the above, there is a need for an improved dry dust collector, which can continuously purify exhaust gas for 24h, and simultaneously, can realize periodic dust collection and cleaning, and can help to improve the production efficiency.

The technical scheme provided by the invention is as follows: the utility model provides a dry-type dust pelletizing system, the system includes intake pipe, the outlet duct, unload a plurality of clean rooms that grey subassembly and carbon steel box enclose, wherein the intake pipe includes inlet manifold and communicates to the inlet branch pipe in each clean room, inlet manifold's internal diameter diminishes along the direction of admitting air gradually, the clean room top is equipped with the jetting subassembly, and inside vertical row is equipped with the air filtering subassembly, the pending gas that inlet branch pipe lets in carries out filtration treatment back through the air filtering subassembly and discharges through the outlet duct, jetting subassembly and each clean room are with solitary solenoid valve control intercommunication state, the absorptive dust of sack in the air filtering subassembly is collected and is cleared up out by the grey subassembly that unloads of installing in the clean room bottom under the effect of jetting subassembly.

Furthermore, the box body comprises a cylinder body and a top cover arranged on the cylinder body, the cylinder body and the top cover are fixedly connected through flanges matched with each other on the outer side wall, and the bottom end of the cylinder body is connected with the ash discharging assembly through the flange on the outer side wall.

Furthermore, a glass fiber reinforced plastic coating is arranged on the inner wall of the box body for corrosion prevention, a plurality of baffle plates are arranged on the inner side wall of the box body, and each baffle plate is inclined downwards; the top of the ash unloading component is provided with a flow equalizing plate, and through holes distributed in an array are formed in the flow equalizing plate.

Further, the air filtering component comprises a bag cage for loading a cloth bag and a detachable connecting piece, wherein the connecting piece clamps the opening of the cloth bag at the top end of the bag cage, and the cloth bag is made of polytetrafluoroethylene.

Further, the jetting subassembly is the pulse jetting, including pulser, pulse valve, compressed air buffer tank and gas package, wherein the gas package arranges in the clean room and with the switch-on of compressed air buffer tank, the opening of pulser control pulse valve gets into the gas package blowback sack with the compressed air that releases in the compressed air buffer tank, and gas package temperature control is at 80-120 ℃, and the gas package of a plurality of clean rooms communicates each other.

Furthermore, the ash discharging assembly comprises a conical ash hopper and a star-shaped ash discharging valve which are arranged from top to bottom, wherein a position sensor is installed in the ash hopper, if the position sensor feeds back a high material level, the star-shaped ash discharging valve is opened, ash is discharged into the screw conveyor or the ton bag and is discharged, and if the position sensor feeds back a low material level, the star-shaped ash discharging valve and the screw conveyor are correspondingly closed.

Furthermore, the middle part of the ash bucket is also provided with a vibrator.

Further, the bottom of the dust chamber is provided with a clearance.

Furthermore, the system also comprises a hot air pipeline which is respectively communicated with each dust chamber; the box body and/or the ash discharging assembly are/is also provided with a heater.

Furthermore, the system is provided with temperature monitoring devices at a plurality of parts of the dust removing chamber and the dust discharging assembly so as to regulate and control the opening of corresponding heaters in the dust removing system to realize integral heat preservation.

Compared with the prior art, the dry type dust removal system provided by the invention comprises an air inlet pipe, an air outlet pipe, a plurality of dust chambers surrounded by dust discharging assemblies and a carbon steel box body, wherein the air inlet pipe comprises an air inlet main pipe and air inlet branch pipes communicated with each dust chamber, the inner diameter of the air inlet main pipe is gradually reduced along the air inlet direction, a blowing assembly is arranged above each dust chamber, a gas filtering assembly is vertically arranged in each dust chamber, gas to be treated introduced by the air inlet branch pipes is filtered by the gas filtering assembly and then is discharged through the air outlet pipe, the blowing assembly and each dust chamber are communicated in an independent electromagnetic valve control mode, and dust adsorbed by a cloth bag in the gas filtering assembly is collected and cleaned by the dust discharging assembly arranged at the bottom of the dust chamber under the action of the blowing assembly. According to the invention, the plurality of independent dust chambers are arranged for filtering treatment, so that at least one dust chamber can be kept in normal operation during ash removal, the dust removal system can be ensured to be matched with and produced for 24h for uninterrupted operation, the diameter of the pipeline is optimized, and the stable gas velocity and the uniform gas inlet amount of each dust chamber are ensured.

Drawings

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

Fig. 1 is a plan view showing the overall structure of a dry dedusting system according to an embodiment of the present invention.

Fig. 2 is a simplified schematic diagram of the dust removal system shown in fig. 1.

Fig. 3 is a schematic view of the interior of a clean room shown in fig. 2.

Description of reference numerals:

the following detailed description further illustrates embodiments of the invention in conjunction with the above-described figures.

Detailed Description

So that the manner in which the above recited objects, features and advantages of embodiments of the present invention can be understood in detail, a more particular description of the invention, briefly summarized above, may be had by reference to the embodiments thereof which are illustrated in the appended drawings. In addition, the features of the embodiments of the present application may be combined with each other without conflict.

In the following description, numerous specific details are set forth to provide a thorough understanding of embodiments of the invention, and the described embodiments are merely a subset of embodiments of the invention, rather than a complete embodiment. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without any creative effort belong to the protection scope of the embodiments of the present invention.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which embodiments of the present invention belong. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the embodiments of the invention.

Referring to fig. 1, the present invention provides a dry dust removal system 100 for filtering industrial waste gas, which is suitable for 24h operation and has a good dust removal effect. As shown in fig. 1, the dry dedusting system 100 includes a plurality of dust chambers 30 surrounded by an air inlet pipe 10, an air outlet pipe (not shown), an ash discharge assembly 60 and a carbon steel box 20, wherein:

the air inlet pipe 10 comprises an air inlet main pipe 12 and an air inlet branch pipe 15, wherein the air inlet main pipe 12 is connected with industrial waste gas generated in the production process and is uniformly input into the dust removal system 100 through the air inlet branch pipe 15 for filtration treatment. In the specific embodiment, the inner diameter of the intake manifold 12 is gradually reduced along the intake direction, so as to ensure the consistency and stability of the exhaust gas flow speed in each path of the intake manifold 12. In the present embodiment, the diameters of the intake branches 15 are the same, and the positions of the access systems 100 are on the same horizontal line, it can be understood that the diameters of the intake branches 15 may not be equal, and the access positions may be different in height.

And an outlet pipe (not shown) for guiding the filtered clean gas in the dust removing system 100 to the outside, wherein the dust removing system 100 comprises a plurality of dust removing chambers 30, and the outlet pipe connects the filtered gas in the dust removing chambers 30 out and converges out of the same outlet.

The dust chamber 30 is a cavity for filtering impurities, adsorbing dust and the like, and is formed by enclosing a carbon steel box body 20 in order to improve corrosion resistance and prolong service life. In the specific embodiment, on the basis of the carbon steel box body 20, the inner wall of the carbon steel box body is further provided with a glass fiber reinforced plastic coating to further optimize the corrosion resistance. In actual installation and application, a conventional dust remover is only provided with one dust removal chamber 30, and for improving the treatment capacity, the size of the dust removal chamber 30 is relatively large, the dust removal chamber 30 is formed by splicing a plurality of plates and is sealed by welding, so that the large area and the large size need to be sealed, the installation difficulty is increased, the sealing effect is poor, and the probability of occurrence of the unsealed phenomenon is high along with the corrosion of corrosive components in industrial waste gas after long-time use. The invention designs a plurality of large-scale dust chambers 30, and can reduce the size of a single dust chamber 30, thereby realizing integral assembly, reducing the area or size to be sealed and ensuring long-time use. In one embodiment, the housing 20 includes a cylindrical body 21 and a top cover 25 mounted on the cylindrical body 21, and fixedly coupled to each other by flanges (not shown) fitted to outer sidewalls thereof, and then sealed. In this embodiment, four dust chambers 30 are provided, and are arranged side by side. It is to be understood that the number of the dust chambers 30 is not limited to the present embodiment, and may be 2, 3, or 5 or more; in other embodiments, the spacing between the dust chambers 30 is not unique, and they are not arranged closely, and need to be set according to the actual application scenario.

Referring to fig. 2 and 3 together, in order to filter the industrial waste gas, an air filtering assembly 50 is vertically arranged in the dust chamber 30, and the air filtering assembly 50 includes:

the cloth bag 53 is provided with micron-sized or submicron-sized meshes, dust-containing waste gas entering the dust removal chamber 30 is filtered, dust in the waste gas is blocked outside the cloth bag 53, the dust is gradually adsorbed and accumulated outside the cloth bag 53 along with the flow of the waste gas from the outside to the inside of the cloth bag 53, and the clean gas entering the cloth bag 53 reaches the gas outlet pipe and is discharged. In order to adapt to the working conditions of high corrosivity and high temperature (the working temperature is 240 ℃), the cloth bag 53 can be a polytetrafluoroethylene membrane-coated filter material, such as a film composite polyester needled felt, a film composite 729, a film composite polypropylene needled felt, a film composite glass fiber and an antistatic film composite polyester needled felt. The cloth bag 53 can be made of glass fiber filter materials, metal fiber filter materials and special boiler filter materials in other occasions.

A bag cage 55, a carrier for placing and supporting the cloth bag 53, which is matched with the shape of the cloth bag 53.

The connector 51 is mounted on the inner wall of the case 20, and a plurality of bag cages 55 are arranged in an array. In this embodiment, the connecting member 51 also functions to clamp the mouth of the cloth bag 53 on the top end of the bag cage 55, so that the cloth bag 53 can be detached and replaced, in a specific embodiment, the connecting member 51 may be a movable claw integrated with the main body, and is clamped by being tensioned under the control of a spring, and the spring is compressed under the action of an external force or a clamping device to facilitate the removal of the cloth bag 53; the connector 51 may also be a detachable body including a collar or a press ring screwed to the main body.

In particular embodiments, the connector 51 and the bag cage 55 may be of unitary construction or combined.

In a specific embodiment, the present invention contemplates a filtered gas velocity: the filtering effect of the fine dust particles can be ensured below 0.5 m/min.

In the embodiment, a plurality of baffles 23 are disposed on the inner sidewall of the box 20, and each baffle 23 is inclined downward for deflecting the exhaust gas flow rushing upward to move downward or toward the cloth bag 53, so that the gas flow is more uniformly distributed in the dust chamber 30, thereby primarily reducing the dust filtering concentration.

In the embodiment, the box 20 is further provided with a heater (not shown), such as an electric heater, to ensure the exhaust gas to be dry and free from condensation in a cold environment.

After the dust removal system 100 is started to work for a period of time, more dust is adsorbed on the outer side of the cloth bag 53, so that an airflow channel is blocked, and the dust removal efficiency and effect are reduced, therefore, the overloaded cloth bag 53 and the dust accumulated in the dust removal chamber 30 need to be cleaned.

In this way, in the present embodiment, a blowing assembly 40 is disposed above the dust chamber 30, and comprises a pulser (not shown), a pulse valve (not shown), a compressed air buffer tank (not shown), and an air bag 41, wherein,

the air bag 41 is arranged in the dust removing chamber 30, is arranged above the air filtering component 50, can blow the loaded compressed air into the cloth bag 53 through compression and extension reciprocating motion, and carries out back blowing on the adsorbed dust in the motion of the airflow from the inside to the outer side of the cloth bag 53, so that the dust is separated from the cloth bag 53 and is settled under the action of gravity. In the specific embodiment, the temperature of the air bag 41 is controlled to be 80-120 ℃, in the present embodiment, each air bag 41 is correspondingly provided with a plurality of electric heaters for controlling the temperature to be constant in the above range. In the embodiment, the air bags 41 of the dust chambers 30 are communicated with each other, so that the blowing pressure drop is further stabilized.

A compressed air buffer tank (not shown) is externally connected with an air source point, and is connected into the air bag 41 after oil removal, water removal and pressure regulation. In this embodiment, the blowing compressed air is respectively connected to two compressed air buffer tanks from an air source point, and is respectively connected to the air bags 41 in the dust removal chamber 30 after oil removal, water removal and pressure regulation. It can be understood that the number and the capacity of the dust chambers 30 are changed, and the number of the connected compressed air buffer tanks is not limited to two, and the number is adjusted according to the actual situation.

The pulse instrument (not shown) is used for controlling the opening of the pulse valve so as to release the compressed air in the compressed air buffer tank to enter the air bag 41 and blow back the cloth bag 53. The pulse instrument can perform constant pressure or timing blowing, and the blowing pulse width and interval can be set. If the constant pressure blowing is adopted, a pressure intensity detection device is arranged to detect the pressure difference of each dust chamber 30 so as to control the blowing operation.

In order to facilitate the uniform distribution, agglomeration and natural sedimentation of dust, the bottom of the dust removal chamber 30 is further provided with a clearance 35. In this embodiment, a clearance 35 of 1.5m high is provided. It is understood that the height of the clearance 35 is not limited to the present embodiment.

The settled dust needs to be cleaned out periodically to ensure that the dust concentration in the dust chamber 30 is lower than a certain range so as to continuously perform filtering treatment, so that the dust discharging assembly 60 is arranged below the dust chamber 30, and the dust discharging assembly 60 and the bottom end of the barrel 21 are also fixed through an outer flange and are subjected to sealing treatment. The dust discharging assembly 60 includes a tapered dust hopper 61 and a star-type dust discharging valve 65, which are arranged from top to bottom, wherein,

the ash bucket 61 is used for collecting and loading ash powder, generally has a conical shape, the upper end is large, the lower end is small, and in the embodiment, the section of the ash bucket 61 is square, and the whole ash bucket is integrally formed with a flange. In the embodiment, a flow equalizing plate 63 is disposed on the top of the ash bucket 61, and a plurality of through holes distributed in an array are formed in the flow equalizing plate 63 for allowing the powder to uniformly settle into the ash bucket 61.

And the star-shaped ash discharge valve 65 is used for controlling the discharge of the lower end opening of the ash bucket 61.

In the embodiment, position sensors (not shown) are installed at several positions of the ash hopper 61, if the position sensors feed back a high level, the system 100 alarms, the star-shaped ash discharge valve 65 is opened, ash is discharged into the screw conveyor 67 or the ton bag and is sent out, and if the position sensors feed back a low level, the star-shaped ash discharge valve 65 and the screw conveyor 67 are correspondingly closed. The spiral conveyor 67 is communicated with each dust removal chamber 30 and converges to the same outlet, and the mode can realize the ash removal uniform conveying and collection of a plurality of dust removal chambers 30 with far intervals, thereby reducing the unloading operation station and further increasing the stacking density of dust.

In the specific embodiment, a vibrator (not shown) is further provided in the middle of the ash bucket 61, and when the powder is more and the circulation speed is low, the vibrator is started to help the powder flow out at an accelerated speed.

The dust is collected in the ash bucket 61, and in order to prevent the ash accumulation from hardening due to dewing and causing abnormal ash discharge, in a specific embodiment, an electric heating device is required to be arranged at the lower part of the ash bucket 61 so as to ensure that the ash accumulation temperature in the ash bucket 61 is 5-10 ℃ (about 80 ℃) higher than the dew point temperature of the flue gas. Meanwhile, the bottom of the ash bucket 61 can be provided with a temperature probe for detecting the temperature of the dust layer.

As shown in fig. 1, the present invention has a plurality of dust chambers 30 shown in fig. 2, in this embodiment, 4 independent dust chambers 30, and the blowing assembly 40 is in communication with each dust chamber 30 through an independent solenoid valve, so that each dust chamber 30 can independently operate a filtering process or an ash removing process without affecting each other, thereby ensuring that at least one dust chamber 30 is in a normal filtering process and meeting the matching requirement of 24h operation. According to the conventional design, only one dust chamber 30 is usually opened for ash removal, that is, only one air inlet branch pipe 15 and one air outlet pipe (branch pipe communicated with the dust chamber 30 for ash removal) are closed. Under the condition that the introduction of waste gas is stopped, namely when the equipment is turned on and turned off, the waste gas contains both granular dust and hydrogen chloride gas, so that dust condensation is caused due to the reduction of temperature, and further the dust condensation is hardened and the bag pasting phenomenon is possibly caused; meanwhile, the hydrogen chloride gas can be condensed when the temperature is reduced, and a strong corrosive liquid is formed to corrode equipment, so that the service life is influenced. Therefore, after the clean room 30 is separated from the system 100, additional heating and heat preservation processes are required, and therefore, the present invention is designed with the hot air pipes 70 respectively connected to each clean room 30. After the clean room 30 is disconnected from the system 100, the pipe heater and the hot air hand valve of the clean room 30 are turned on, and dry hot air is supplied to the clean room 30 by the hot air blower, so as to remove the residual HCl atmosphere in the chamber. After the maintenance is finished, corresponding operation is carried out to raise the temperature of the atmosphere in the dust removing chamber 30. And after the air supply is finished, closing the heater and the corresponding hand valve. In a specific embodiment, the heater is provided with a temperature transmission function, the temperature of the air supplement is monitored and adjusted, and pressure and flow are adjusted through the outlet hot air blower and the outlet valve. Accordingly, temperature monitoring devices may be provided at various locations of the system 100 to regulate the heaters to ensure that the system 100 is maintained at a desired temperature.

In conclusion, the dry-type dust removal system is provided with a plurality of dust removal chambers, each dust removal chamber operates independently, dust can be removed at a fixed period, and the 24-hour environment-friendly filtration treatment of industrial waste gas is guaranteed; the cloth bag is detachable, so that the cloth bag is convenient to detach, clean or replace at regular intervals; the filtering effect of fine dust particles is ensured through multiple designs such as a gradually-changed-diameter air inlet header pipe, a baffle plate, cloth bag materials, filtering air speed and the like; meanwhile, the design and the adoption of a box body material, a hot air pipeline, a heater, a temperature monitoring device and the like solve the problem that the waste gas is easy to dewing and corrode equipment under the condition of temperature reduction, and prolong the service life of the equipment.

Although the embodiments of the present invention have been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the embodiments of the present invention.

Claims (10)

1. A dry dedusting system is characterized in that: the system includes the intake pipe, the outlet duct, unload a plurality of clean rooms that grey subassembly and carbon steel box enclose, wherein the intake pipe includes air intake manifold and communicates to the air inlet branch pipe in each clean room, air intake manifold's internal diameter diminishes along the direction of admitting air gradually, the clean room top is equipped with the jetting subassembly, and inside vertical row is equipped with the filtration subassembly, the pending gas that air inlet branch pipe lets in carries out filtration treatment back through the outlet duct discharge through the filtration subassembly, the jetting subassembly is with independent solenoid valve control connected state with each clean room, the absorptive dust of sack in the filtration subassembly is collected and is cleared up out by the grey subassembly that unloads of installing in the clean room bottom under the effect of jetting subassembly.

2. The dry dusting system of claim 1, wherein: the box includes the barrel and installs the top cap on the barrel, and the flange that mutually supports on both outside walls carries out fixed connection, and the barrel bottom is with unloading grey subassembly and also with flange joint at the lateral wall.

3. The dry dusting system of claim 1, wherein: the inner wall of the box body is provided with a glass fiber reinforced plastic coating for corrosion prevention, the inner side wall of the box body is provided with a plurality of baffle plates, and each baffle plate is inclined downwards; the top of the ash unloading component is provided with a flow equalizing plate, and through holes distributed in an array are formed in the flow equalizing plate.

4. The dry dusting system of claim 1, wherein: the air filtering component comprises a bag cage for loading a cloth bag and a detachable connecting piece, wherein the connecting piece clamps the opening of the cloth bag on the top end of the bag cage, and the cloth bag is made of polytetrafluoroethylene.

5. The dry dusting system of claim 1, wherein: the jetting subassembly is the pulse jetting, including pulser, pulse valve, compressed air buffer tank and gas package, wherein the gas package arranges in the clean room and with the switch-on of compressed air buffer tank, the opening of pulser control pulse valve gets into the gas package blowback sack with the compressed air that releases in the compressed air buffer tank, and gas package temperature control is at 80-120 ℃, and the gas package of a plurality of clean rooms communicates each other.

6. The dry dusting system of claim 1, wherein: the ash discharging assembly comprises a conical ash bucket and a star-shaped ash discharging valve which are arranged from top to bottom, wherein a position sensor is arranged in the ash bucket, if the position sensor feeds back a high material level, the star-shaped ash discharging valve is opened, ash is discharged into the screw conveyor or the ton bag and is discharged, and if the position sensor feeds back a low material level, the star-shaped ash discharging valve and the screw conveyor are correspondingly closed.

7. The dry dusting system of claim 6, wherein: the middle part of the ash bucket is also provided with a vibrator.

8. The dry dusting system of claim 1, wherein: the bottom of the dust chamber is provided with a clearance.

9. The dry dusting system of claim 1, wherein: the system also comprises a hot air pipeline which is respectively communicated with each dust removing chamber; the box body and/or the ash discharging assembly are/is also provided with a heater.

10. The dry dusting system of claim 9, wherein: the system is provided with temperature monitoring devices at a plurality of parts of the dust removing chamber and the dust discharging assembly so as to regulate and control the opening of corresponding heaters in the dust removing system to realize integral heat preservation.

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