61results about How to "Extended cleaning cycle" patented technology

The application discloses a honeycomb type rainwater collecting pool in the technical field of municipal engineering drainage, which comprises six side plates, a water inlet pipe, a plurality of columns and two three-hole side plates, two closed side plates and two double-hole side plates. Each column is arranged on one side of each side plate and is in clamping connection with the side plate. Each three-hole side plate, closed side plate and double-hole side plate is in clamping connection with the column and has a hexagonal shape. The honeycomb type modular design is adopted, the six side plates, three-hole side plates, closed side plates and double-hole side plates are clamped and connected through the columns, the overall shape has no fixed size limitation, the number of modules can be freely increased or decreased and the combined form can be arbitrarily adjusted according to the actual space of narrow and irregular sites such as road corners at the end of rainwater branch pipes, cracks in old communities and narrow green belts, and meanwhile, the clamping and positioning structure of the upper fixed plate, lower fixed plate and column ensures the overall stability after assembly.

The present application belongs to the technical field of oily wastewater treatment equipment, and particularly relates to a combined filter and oil removal equipment for oily wastewater treatment. The equipment comprises coalescing filter cartridges and modified quartz sand fillings arranged in the coalescing filter cartridges, and combines a traditional filling filter with a filter cartridge type coalescing oil removal device to form a structure of 'fillings in filter cartridges'. The present application disperses the filter fillings in the coalescing filter cartridges, effectively avoids the problem of hardening of large filling slabs, improves the stability and service life of the system, and has the functions of efficient oil removal and filtration of suspended solids. The equipment has compact structure, small volume and stable operation, can significantly improve the filtration efficiency and reduce the maintenance frequency, and is suitable for oily wastewater treatment systems with large water quality fluctuations.

The utility model relates to the technical field of drainage collectors, and discloses a drainage collector capable of cleaning the interior, a floating ball switch is additionally arranged on one side of a trap, water is drained from a water supply pipeline through a water guide pipe, an electromagnetic valve is arranged in the middle of the water guide pipe, and when the water level in the trap is detected to be too low, the electromagnetic valve is opened, and the water level in the trap is closed. When the anti-blocking floor drain is blocked, the electromagnetic valve is opened, water is supplemented into the trap pipe through the water guide pipe, the situation of odor returning caused by the low water level can be avoided, the anti-blocking floor drain is installed in a floating mode through the spring, the contact switch is arranged on the lower portion of the anti-blocking floor drain, and when the anti-blocking floor drain is blocked, the contact switch is switched on. When the anti-blocking floor drain is used, the pressure of the anti-blocking floor drain is increased due to water accumulation, the thrust of the spring is overcome to press the contact switch, water is conveyed to the flushing cylinder seat through the water guide pipe, and automatic flushing and cleaning of the anti-blocking floor drain can be realized without manual operation; leakage holes in the peripheral side and the lower portion of the anti-blocking floor drain can be effectively washed and cleaned through the washing spray holes.

The utility model discloses a kind of anti-clogging filter membrane assemblies, it is related to water filtration technical field, including cylindrical filter membrane and cylindrical hard filter cartridge;The hard filter cartridge is located in filter membrane inside;Hard filter cartridge lower side and upper side are equipped with water inlet pipe and pollution collection box respectively, water inlet pipe is rotatably installed with the impeller rotating with water flow, hard filter cartridge inside is equipped with bracket, and bracket edge is equipped with the brush that is attached with hard filter cartridge inner wall;The impeller is connected with bracket through pivot;The utility model drives impeller rotation by water flow, impeller drives bracket and brush to clean the foreign matter of hard filter cartridge inside, can avoid foreign matter to be stuck on hard filter cartridge;Pollution collection box is set in hard filter cartridge lower side, can accommodate the foreign matter cleaned in large quantity, prolongs the cleaning cycle of hard filter cartridge.

The utility model discloses a membrane component capable of uniformly aerating, which comprises a membrane shell, a membrane wire distribution frame and an aerating pipe, the membrane wire distribution frame is arranged in the membrane shell, the membrane wire distribution frame is provided with a central pipe, the outer side of the central pipe is provided with a plurality of partition plates, the upper ends of the partition plates are provided with hollow aerating channels, two sides of the aerating channels are provided with aerating holes, and the aerating holes are communicated with the central pipe. An air inlet hole is formed in the pipe wall of the central pipe, and the upper end of the aeration pipe extends into the central pipe and is communicated with the aeration channel through the air inlet hole. According to the utility model, the partition plate is provided with the aeration channel and the aeration holes on the two sides, so that a three-dimensional aeration mode that gas radiates and diffuses from the center of the membrane module to the periphery is realized, different areas of membrane wires can be covered, and the aeration uniformity is obviously improved.

This invention provides an integrated device for controlling microbial contamination in seawater desalination, comprising a base, a high-pressure pump mounted on the left side of the base, an online flow cytometer system mounted on the base, and an RO membrane holder mounted on the right side of the base. The base facilitates the installation of the dosing mechanism, diaphragm pump, and online flow cytometer system. The high-pressure pump pressurizes and delivers seawater for subsequent desalination via the RO membrane. The online flow cytometer system monitors the microorganisms in the seawater delivered by the high-pressure pump and simultaneously controls the diaphragm pump to deliver the bactericide from the dosing mechanism upstream of the cartridge filter, sterilizing the seawater entering the RO membrane and thus extending the cleaning cycle and lifespan of the RO membrane.

The application discloses a rotary air preheater with a multilayer annular heat pipe, relates to the technical field of air preheating, and comprises an outer shell, an inner rotor, a center cylinder, a flue gas inlet, an air outlet, a flue gas outlet, an air inlet, a disturbance mechanism, a ring pipe group, a driving piece and a corrugated plate group. The center cylinder is coaxially arranged at the center position in the outer shell, the inner rotor is rotationally arranged on the outer wall of the center cylinder, the outer wall of the inner rotor is rotationally connected with the inner wall of the outer shell, the inner rotor is driven by the driving piece located at one side of the outer shell, the flue gas inlet and the air outlet are formed in the top end of the outer shell, and the flue gas outlet and the air inlet are formed in the bottom end of the outer shell. The corrugated plate group and the ring pipe group are arranged in the inner rotor, and a plurality of disturbance mechanisms are circumferentially arranged on the inner wall of the ring pipe group. The flue gas and the air are transversely washed to the annular heat pipe, the heat exchange coefficient of the flue gas and the air is strengthened, the deposition rate and deposition amount of ammonium bisulfate on the heated surface can be significantly slowed down, and the safety risk is reduced.

The utility model discloses an automatic balling production line bin top dust remover, which comprises a dust removal cylinder, a dust removal cover head, a reverse air impact guide pipe, a pulse electromagnetic valve, a high-pressure air storage tank and a filter element, the filter element is arranged in the dust removal cylinder, and air outlet holes are distributed in the surface of the reverse air impact guide pipe part in the middle of the interior of the filter element. And an outer port of the anti-air-flushing guide pipe is connected with a port on one side of the pulse electromagnetic valve. The back flushing device has the beneficial effects that the part, with the air outlet hole structure, of the back flushing guide pipe is arranged in the filter element, and high-pressure air in the high-pressure air storage tank is output and discharged from the air outlet hole structure in combination with the opened pulse electromagnetic valve, so that back flushing can be carried out by high-pressure air flow from the inside of the filter element to the outside; meanwhile, the guide-in opening formed in the bottom of the dust removal barrel faces downwards, so that the falling centrality of impurities such as dust is guaranteed, and the cleaning period is prolonged.

The application relates to the technical field of environment-friendly treatment devices, and discloses an electroplating acid mist high-efficiency environment-friendly treatment device which comprises a treatment box, a gas inlet pipe is welded through the side surface of the treatment box, an air suction cover is welded at the end of the gas inlet pipe, a sleeve is welded on the surface of the gas inlet pipe, and heat dissipation fins are welded between the gas inlet pipe and the sleeve. In the application, the screw-belt type heat dissipation fins welded between the gas inlet pipe and the sleeve form a high-efficiency heat exchange channel. When the acid mist flows in the gas inlet pipe, the heat carried by the high-temperature acid mist is transmitted to the alkali liquor in the sleeve through the heat dissipation fins, so that the acid mist is pre-cooled, the alkali liquor is pre-heated, the pre-heated alkali liquor is conveyed into the treatment box under the action of a booster pump, is sprayed on a filler layer, the pre-heated alkali liquor can increase the system temperature, the probability of acid-base ion collision is increased, so that the neutralization reaction time is shortened, the acid mist removal efficiency per unit time is improved, the pre-heated alkali liquor can reduce heat loss, and the energy consumption cost is reduced.

The invention discloses a slaughter workshop air purification device, and relates to the technical field of air purification treatment, the slaughter workshop air purification device comprises a tunnel-shaped box body, the interior of the box body is sequentially provided with a primary filtering assembly, a secondary filtering assembly, a washing assembly, a packed bed assembly, a wire mesh demister and a centrifugal fan from an air inlet to an air outlet; a lifting mechanism is arranged on the upper portion of the box body, a walking trolley is arranged on the track, the washing assembly is arranged on the walking trolley and comprises a washing pipe and a first flushing pipe, and a switching mechanism is arranged on the walking trolley. Pollutants in the slaughter workshop can be removed through multi-stage filtration and purification, so that the purification effect is greatly improved, the positive transformation of the equipment from regular shutdown and high-strength manual disassembly and washing to automatic maintenance and deep cleaning as required is realized, the original purification efficiency of filtration and filling can be continuously recovered, and the service life of the equipment is prolonged. Manual operation risks and labor intensity can be greatly reduced, and stable and efficient operation of equipment in the whole life cycle is guaranteed.

The application discloses a kind of kitchen biogas liquid treatment devices, belong to sewage treatment technical field, it includes connecting plate, ring cylinder, fling filter mechanism, filter mechanism, protective cylinder, butt joint pipe, microwave heating pipe and storage tank, ring cylinder is located on connecting plate, fling filter mechanism rotates and is installed in ring cylinder, filter mechanism is inserted in fling filter mechanism and is communicated, protective cylinder is installed on ring cylinder, butt joint pipe is communicated protective cylinder and fling filter mechanism.The device is transported by centrifugal force generated by fling filter mechanism rotation, microwave heating pipe is heated to reduce viscosity and reduce colloid adsorption, filter mechanism retains impurities, and storage tank collects primary filtrate.The device solves the problem that existing device is easy to block, needs flocculating agent, and maintenance is difficult, realizes efficient filtration, convenient maintenance and low cost.

A centrifugal fan with an air filtering device comprises a machine shell (8), an air outlet pipe (2) of the machine shell is a rectangular pipe body, the air filtering device is installed in the air outlet pipe, the air filtering device is composed of a filter screen (5) and a frame body (6), the filter screen is connected to the frame body, the frame body is of a bent structure, and the filter screen is bent along with the frame body. The filter screen is characterized in that the filter screen is of a curved surface structure after being bent along with the frame body. The centrifugal fan has the beneficial effects that the surface area of the filter screen is larger than the sectional area of the air outlet pipe, so that the interception amount of particulate matters in air can be greatly increased, the cleaning period of the filter screen is prolonged, and the shutdown frequency of the centrifugal fan is reduced; the air filtering device is convenient to assemble and disassemble, and the filter screen is convenient to clean.

The utility model discloses a kind of edge corner processing structures for cow leather dancing shoes upper leather processing, including roller conveyor, processing support is installed on the roller conveyor, lifting support is installed on the inboard of the roller conveyor, lifting feeding cutter is installed on the processing support, the lifting feeding cutter includes collection cylinder, a pair of lifting grooves are set up on the processing support, lifting extrusion block is installed in the inboard of the lifting groove, the utility model relates to leather upper production technical field, full-process automation, in combination with roller conveyor, lifting feeding cutter and intelligent control system, complete from leather feeding, extrusion forming to cutting separation Full-automatic operation, significantly reduce manual intervention.

The utility model discloses a frame body structure of a cooling fan, which comprises a fan body, the fan body comprises a fan frame body, a fan device arranged in the fan frame body and a water tank arranged at the lower end of the fan frame body, the fan frame body is respectively provided with an air inlet and an air outlet, and the fan frame body is arranged in a circular shape. The lower end of the fan frame extends to be provided with a connecting part used for being connected with a water tank, the front end and the rear end of the fan frame are provided with an impeller assembly and a dustproof filter plate, an air inlet groove used for arranging the dustproof filter plate is formed in the fan frame along the air inlet, and an air outlet groove used for arranging an impeller is formed in the fan frame along the air outlet. The fan is reasonable in structural design, the fan is tightly and conveniently connected with a water tank through the circular connecting part at the lower end of the fan frame body, water leakage is avoided, the impeller assembly greatly improves impeller rotation stability, noise and collision are reduced, the service life is prolonged, the protective cover is rotationally clamped with the fixing clamping groove through the clamping teeth, installation and disassembly are convenient, and use is convenient. And later maintenance and replacement are facilitated.

This invention belongs to the field of wastewater treatment technology, specifically relating to a method and apparatus for removing COD from high-salt, high-organic-content wastewater. The removal method employs two organic matter retention membranes connected in series to treat the high-salt, high-organic-content wastewater. By controlling appropriate process conditions, these organic matter retention membranes primarily retain organic matter while retaining as little salt as possible, ensuring stable operation of subsequent processes or achieving compliant wastewater discharge. Furthermore, the concentrate obtained after treatment by each organic matter retention membrane is returned in a specific proportion to the inlet of the membrane that produced the concentrate, thereby ensuring efficient and stable membrane operation, improving system recovery rate, and extending membrane lifespan. This invention achieves COD removal from high-salt, high-organic-content wastewater using only a single process, exhibiting high removal rate, good decolorization effect, and high recovery rate. It significantly shortens the process flow and is characterized by being green, efficient, energy-saving, environmentally friendly, and highly reliable.

The utility model discloses an edge computing device machine case protection structure suitable for wide temperature environment, include: shell body, upper cover body, exhaust component and heat dissipation component, the upper cover body is installed to the upper of shell body, the rear end surface of shell body is installed with exhaust component, the inside installation of shell body has heat dissipation component, heat dissipation component includes heat conduction board, the lower surface of heat conduction board is provided with a plurality of transverse interval arrangement distribution's heat conduction cavity, the end of heat conduction cavity installs the assembly pipe for with multiple sets of heat conduction cavity communication, the assembly pipe is U type structure, and the end of heat conduction cavity is installed with liquid inlet pipe and liquid outlet pipe respectively, and one end of liquid inlet pipe and liquid outlet pipe is connected with circulating pump box. It has realized to make edge computing device machine case protection structure can be suitable for wide temperature environment, has effectively improved the heat dissipation effect, has strengthened the adaptability of equipment to wide temperature environment.

The utility model discloses a spraying dust-settling device for recycled aggregate production, which comprises a crusher box body, a feeding bin is arranged at the top of the crusher box body, two crushing rollers are arranged in the feeding bin, a liquid collecting cavity is arranged in the crusher box body, the liquid collecting cavity is communicated with the feeding bin, a notch is arranged in the middle of the crusher box body, and the notch is communicated with the liquid collecting cavity. Two lug plates are fixed to the middle of one side of the crusher box body, rotating rollers are arranged between the two lug plates and in the liquid collecting cavity, and the two rotating rollers are arranged in parallel. The piston rod is pushed upwards to drive the piston to move upwards, when the piston moves upwards, purified water collected in the transfer cylinder can be discharged into the filter cylinder through the second guide pipe, at the moment, the flow direction of the purified water passing through the filter cotton is from top to bottom and is just opposite to the direction of the sewage passing through the filter cotton, and at the moment, the purified water plays a backwashing role. And the filter cotton can be preliminarily cleaned by backwashing, so that the period of dismounting the filter cotton for cleaning can be relatively prolonged.

The utility model discloses a three -dimensional rotary shower with planetary gear set drive, aims at solving the problems of the prior art cleaning blind area, size limited etc. Its main structure includes driving arrangement, hollow outer pole, inner rod, water outlet device, and at least one of outer pole and inner rod is rotary output pole and drives water outlet device to rotate, and the water outlet device is equipped with rotatable shower rotating seat, is driven through bevel gear pair, and is equipped with planetary gear set, realizes the rotation of shower rotating seat revolution and rotation combination. When working, planetary gear set changes transmission ratio, makes shower cleaning period to promote 2 10 times, even if single nozzle can also realize no blind area, no dead angle three -dimensional cleaning. Compared with prior art, the shower cleaning efficiency of this utility model improves 150%, and energy consumption reduces 20%, has remarkable economic benefit and practical value.

This application provides a slit valve and a semiconductor manufacturing apparatus. The slit valve includes: a slit valve body having a slit channel; at least one plasma generating unit disposed on the inner wall of the slit channel; the plasma generating unit is used to ionize gas in the slit channel to form plasma, thereby removing dust deposited on the inner wall of the slit channel. Compared to the prior art, using the slit valve of this application to connect two chambers of a semiconductor manufacturing apparatus allows for plasma generation by the plasma generating unit without opening the chambers. The plasma then removes dust deposited on the inner wall of the slit valve, thereby inhibiting dust deposition within the slit valve, extending the cycle of opening the chambers for dust cleaning, and reducing downtime losses of the semiconductor manufacturing apparatus.

This utility model discloses a filter element and a filter for adhesive solutions. A filter element seat is provided at the inlet end of the outlet pipe, and a filter element is installed on the filter element seat. The inlet of the outlet pipe communicates with the inner cavity of the filter element. A filter element cover is provided at the top of the filter element, and a lower sleeve is provided at the bottom of the filter element. The lower sleeve is sealed and installed on the inlet end of the outlet pipe. The filter element includes an outer frame, an inner frame, and a jacketed filter cylinder. The jacketed filter cylinder is located between the outer frame and the inner frame. Both the outer frame and the inner frame have several mesh openings. In a horizontal projection plane, the jacketed filter cylinder is a corrugated closed cylinder, with the crests of the jacketed filter cylinder fixedly connected to the inner side of the outer frame, and the troughs of the jacketed filter cylinder fixedly connected to the outer side of the outer frame. The beneficial effects of this utility model are: the filtration area of ​​the filter element is 3-4 times larger than that of ordinary cylindrical filter elements, reducing the flow resistance of the filter element, improving the filtration efficiency, having a larger dirt holding capacity, and a longer filter element cleaning cycle.

An animal fat refining oil residue treatment system comprises an upper cover, a filtering module and a lower cover, the upper side of the upper cover is connected with an input pipe, the lower side of the lower cover is connected with an output pipe, the filtering module is arranged between the upper cover and the lower cover, and the filtering module comprises a first filtering unit, a second filtering unit and a third filtering unit. The first filtering unit, the second filtering unit and the third filtering unit are each composed of an outer cylinder and a filtering disc, the filtering discs are horizontally and fixedly connected to the interiors of the corresponding outer cylinders, a plurality of filtering pipes are vertically connected to the upper side surfaces of the filtering discs, and a plurality of filtering holes are formed in the filtering pipes; the diameter of a filtering hole of the first filtering unit is larger than that of a filtering hole of the second filtering unit, the diameter of a filtering hole of the second filtering unit is larger than that of a filtering hole of the third filtering unit, and the filtering pressure of the oil residue treatment system is effectively reduced, so that the filtering quality is effectively improved while the filtering efficiency of the oil residue treatment system is improved.

The utility model relates to the technical field of sand screening equipment, and provides a sand screening machine for constructional engineering, which comprises a support frame and a sand screening bin, the sand screening bin is provided with a feeding port and a gravel discharging port, a feeding hopper is arranged at the feeding port, a material collecting bin is arranged in the sand screening bin, and the bottom end of the material collecting bin penetrates out of the sand screening bin and is provided with a fine sand discharging port. A sand screening assembly is arranged in the sand screening bin, the sand screening assembly is rotatably arranged in the sand screening bin, the sand screening assembly forms a first sand screening position and a second sand screening position in the sand screening bin, and the sand screening assembly is provided with a first sand screening surface and a second sand screening surface; the sand screening assembly is switched between a first sand screening position and a second sand screening position; the working position of the sand screening assembly can be repeatedly switched, the phenomenon that the sand screening assembly is blocked is reduced, automatic cleaning to a certain degree is achieved, and the screen does not need to be frequently taken down for cleaning.

The application discloses a shell-and-tube heat exchanger with a self-cleaning function for ammonia water preparation, and relates to the technical field of heat exchange devices.The shell-and-tube heat exchanger comprises a shell and heat exchange tubes, the end of the shell is provided with a head, four tube sheets are arranged in the shell, the four tube sheets are arranged at the two ends and the middle position of the shell, and the shell is divided into two shell passes; an outlet and an inlet are arranged in each shell pass of the shell, the heat exchange tubes are arranged on the tube sheets, a plurality of baffle plates are arranged on the heat exchange tubes, and a cleaning mechanism for cleaning the inner surface and / or the outer surface of the heat exchange tubes is arranged in the shell.The first shell pass is used for heat exchange between liquid ammonia and ammonia water flowing down from the upper tube pass, and the second shell pass is used for heat exchange between refrigerant and ammonia water, so that the ammonia water with the required concentration is prepared through heat exchange of the refrigerant.The process of preparing the ammonia water from the liquid ammonia is only carried out in one shell-and-tube heat exchanger, reaction heat is reasonably utilized, energy is saved, and the number of devices is saved.

The utility model provides a round bag type air filtering and supplying device which comprises a filtering box, the top end of the filtering box is fixedly connected with a fixing ring, a partition plate is clamped in the fixing ring, the side wall of the partition plate is in threaded connection with a plurality of connectors, and round bags made of glass fibers are arranged between the connectors and a collecting barrel. An anti-backflow plate with a funnel-shaped interior is mounted at the top end of the collecting barrel; a supporting table is installed in the middle of the surface of the partition plate, and a vibration motor is installed on the surface of the supporting table. The round bag type air filtering and supplying device has the advantages that the cleaning period of the filter bag is prolonged, the service life of the filter bag is prolonged, and the filtering efficiency is improved.

This invention discloses a membrane coupling-based system and method for treating copper complex wastewater. The method includes: S1 pre-oxidation and complex-breaking treatment; S2 adding a heavy collector to the wastewater and performing cross-flow filtration using a membrane separation device equipped with an electrochemically activated membrane module to obtain a concentrated solution of the heavy collector-copper complex; S3 adjusting the pH of the concentrated solution and performing secondary filtration using the same membrane separation device, retaining the heavy collector for reuse, with the permeate being an acidic solution containing free copper ions; S4 chemically depositing and separating the acidic copper-containing solution to recover copper. In the S2 enrichment stage, a reducing electric field is applied using the membrane as the cathode, and in the backwashing stage, an oxidizing electric field is applied as the anode. The heavy collector is a graft copolymer or terpolymer of polyacrylic acid and β-cyclodextrin, which forms a loose, porous gel layer on the membrane surface during enrichment and naturally peels off. This invention achieves efficient complex breaking of copper complexes, high-purity recovery of copper resources, recycling of the heavy collector, and effective control of membrane fouling.

The utility model relates to the technical field of filter bags, and discloses a multifunctional filter bag which comprises a pipeline and a filter bag body sleeved on the pipeline, a flange is arranged at the end part of the pipeline, the filter bag body is sleeved on the flange, and a mounting piece which is propped against the flange to fix the filter bag body is arranged on the pipeline in a threaded connection manner; the mounting piece is provided with a limiting piece which is connected to the outer side of the filter bag body in a sleeving manner; and a screen cylinder sleeving the outer side of the limiting piece is arranged on the mounting piece. Compared with the prior art, the filter bag has the advantages that the filter bag body can be supported, so that dust is placed between the arc-shaped rods, and the cleaning period of the filter bag is prolonged.

The utility model relates to a backwash dust filter device for a dry-type screw pump. The backwash dust filter device comprises a filter shell consisting of a cylindrical shell and a conical hopper at the lower part, wherein the cylindrical shell is connected up and down; a gas outlet is formed in one side of the upper part of the cylindrical shell, and a compressed gas inlet is formed in the other side; a purge gas inlet pipe is arranged at the compressed gas inlet; an air inlet is formed in one side of the lower part of the cylindrical shell; a partition plate is arranged between the air inlet and the air outlet, a plurality of evenly-distributed stainless steel filter screen cylinders are arranged below the partition plate, the bottom face of the blowing gas inlet pipe is connected with a plurality of evenly-distributed pulse nozzles, and the pulse nozzles correspond to the stainless steel filter screen cylinders one to one. And a reverse blowing electromagnetic valve and a flow regulating valve are arranged on the outer side of the compressed air inlet flange. The double-acting mode of cyclone separation and filter screen filtration is adopted, the filtering effect is better, the structure is simple, and use and maintenance are convenient.

The invention relates to the technical field of air dust removal, and discloses phosphorite mining underground air dust removal equipment which comprises a dust removal box, a top shell, a cloth bag dust removal mechanism, a cleaning mechanism and an ash removal period regulation and control system. The ash removal period regulation and control system is based on the inlet dust mass concentration, the treatment air volume, the pressure difference of the two sides of a filter bag, the gas humidity and dew point margin, the pressure drop recovery rate after last round of ash removal, the initial pressure difference base line after ash removal and the resistance recovery rate. And calculating a dust load impact coefficient, a dynamic resistance coefficient of the filter bag, an environment adaptability degree and a dust cleaning potential coefficient of the filter bag in real time, and dynamically determining a target dust cleaning period according to the parameters. According to the invention, the self-adaptive precise regulation and control of the dust removal period under the instantaneous change of dust load and high-humidity environment is realized, excessive dust removal or insufficient dust removal is effectively avoided, the dust removal efficiency is improved, the energy consumption is reduced, and the service life of the filter bag is prolonged.

The present application relates to polyester recycling, and provides a method for improving the yield and purity of regenerated BHET. After glycolysis of waste polyester in the presence of a metal catalyst, most of the free glycol is removed by evaporation under reduced pressure. A chelating agent composed of a polycarboxylic acid chelating agent and an organic phosphonic acid compound is added to the glycolysis solution, and a fixed bed circulation contact of a solid-supported chelating agent with polycarboxylic acid groups supported on a porous carrier is used to remove metal ions. Subsequently, the glycol is further removed by thin film evaporation to obtain a BHET-rich glycolysis solution. Finally, the distillate is collected in a short path distiller according to the set switching conditions of BHET content and acid value to obtain a high-purity BHET product. This method can inhibit re-polymerization and thermal degradation, reduce metal residues and oligomer content, and improve the yield and purity of BHET.