CN108687031B

CN108687031B - Environment-friendly treatment device and treatment method for zero discharge of wastewater for QPQ (quench-Polish-quench) process production

Info

Publication number: CN108687031B
Application number: CN201810558077.9A
Authority: CN
Inventors: 侯永松
Original assignee: Chengdu Shengxiang Technology Co ltd
Current assignee: Chengdu Shengxiang Technology Co ltd
Priority date: 2018-06-01
Filing date: 2018-06-01
Publication date: 2023-12-01
Anticipated expiration: 2038-06-01
Also published as: CN108687031A

Abstract

The invention relates to an environment-friendly treatment device and a treatment method for zero discharge of wastewater for QPQ process production, comprising a front cleaning device, a rear cleaning device, a sewage filtering device and a wastewater evaporation device, wherein the filtering device comprises a filtering tank, and a purifying layer is arranged in the filtering tank; the rear cleaning device comprises a cooling tank and a rear rinsing tank, wherein the cooling tank and the rear rinsing tank are of an integrated structure, and the cooling tank and the rear rinsing tank are formed by arranging a partition plate; the waste water evaporation device comprises a plurality of electric furnace bodies which are arranged at intervals, electric furnace crucibles are arranged in the electric furnace bodies, and a waste water evaporation box is arranged between the adjacent electric furnace bodies. The production wastewater is generated in the front cleaning device and the rear cleaning device, evaporated in the wastewater evaporation device, and the wastewater filtering device is used as a physical separation device of wastewater, so that the wastewater is recycled, the water is saved, the zero emission of the production wastewater can be realized, the cost is low, and the popularization and the use are convenient.

Description

Environment-friendly treatment device and treatment method for zero discharge of wastewater for QPQ (quench-Polish-quench) process production

Technical Field

The invention belongs to the field of cleaning equipment, and particularly relates to an environment-friendly treatment device and method for zero discharge of wastewater for QPQ (quench-Polish) process production.

Background

Thousands of QPQ process lines are estimated to be available all over the country from the beginning of the last 90 th century of QPQ process into China. Because the investment cost of the technology is low, the technical threshold is also low, and the environmental protection treatment requirement is not strictly implemented in some places, the treatment of the production wastewater of many QPQ technologies in China is in a state of no treatment or unscientific treatment and unqualified emission. Along with the increasing severity of environmental protection in China, the wastewater discharge treatment of QPQ technology reaches the stage of treatment.

The QPQ process technology is essentially a salt bath nitrocarburizing process, is a metal surface treatment technology, has a source which can be traced to a highly toxic cyanide process in the Su's Union period, is improved in later process development, eliminates highly toxic cyanide in the process, has no discharge of highly toxic cyanide by the QPQ process which is executed strictly according to the flow, and has great progress in environmental protection. But the QPQ process is taken as a salt bath metal surface treatment technology, and the front cleaning and the rear cleaning are indispensable process links, so that the treatment and the discharge of the cleaning wastewater are the unavoidable environmental problems of the QPQ process and are the problems which need to be solved in the QPQ industry at present.

The front and back washing in QPQ production process is the main source of production wastewater as shown in figure 1, and the main pollution components in the wastewater are sodium potassium salts (carbonate, chloride and nitrate), iron nitride and iron oxide, sediment and the like. The sodium potassium salt components are completely dissolved in water, cannot be precipitated and filtered, have high concentration, and are difficult to separate from the water by a common method, so that the cost is very high if the QPQ production wastewater is subjected to environmental protection treatment to reach the standard by adopting a traditional scheme.

The tapping and cleaning flow of the QPQ process is carried out in a post-cleaning device. At present, the rear cleaning device is formed by splicing independent groove bodies, overflow holes are formed between the groove bodies, and overflow is realized through pipelines. The overflow holes are adopted, so that the overflow flow is small, and the cleaning liquid in the tank body is easy to overflow to the working environment.

On the one hand, in the existing post-cleaning device, since the product is heated at high temperature and then enters the cooling tank, a large amount of water vapor is generated in the cooling tank, and although the water vapor is harmless to the user, the water vapor is not beneficial to the production of QPQ (quench-quench) process. On the other hand, in the current post-cleaning device, the sewage in the previous cleaning tank easily enters the next tank along with the product, so that the cleaning liquid in the next tank is polluted, and the cleaning effect may be affected.

The patent CN201520143689.3 discloses a cleaning system before a quenching furnace, which belongs to the technical field of cleaning before heat treatment and comprises a cleaning container and an oil-water separation container, wherein the cleaning container is connected with the oil-water separation container through an oil-water pipeline; the oil-water separation container is respectively provided with an upper pipe connecting opening and a lower pipe connecting opening, the upper pipe connecting opening is connected with a cooling device of the thread rolling machine through a cooling oil recovery pipeline, and the lower pipe connecting opening is connected with the cleaning container through a water recovery pipeline. The device is not widely applied and the cleaning effect is not ideal.

The Chinese patent application No. 201721168487 discloses an evaporator for evaporating wastewater, and belongs to the technical field of wastewater evaporation treatment. The patent aims to solve the problems that the wastewater treatment effect of the existing desulfurization system is poor and the wastewater treatment standard cannot be met. The patent includes evaporator ash bucket, evaporator entry section, necking down changeover portion, awl bucket expansion section, evaporation section and rotational flow rectifier, and the side of evaporator entry section is equipped with air inlet flue, and evaporator ash bucket is connected to the lower extreme of evaporator entry section, and necking down changeover portion is connected to the upper end of evaporator entry section, and necking down changeover portion's upper end is connected with awl bucket expansion section, and awl bucket expansion section upper end is connected with the evaporation section, and the top side of evaporation section is equipped with outlet flue, and rotational flow rectifier installs inside necking down changeover portion. The evaporator in the patent evaporates the desulfurization wastewater into solid particles and water, thereby realizing the evaporation treatment of the desulfurization wastewater. However, the patent has a complex structure, and is inconvenient for subsequent treatment because the evaporated solid substances such as a large amount of silt are contained.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention provides an environment-friendly treatment device and a treatment method for zero discharge of wastewater for QPQ process production, comprising a front cleaning device, a rear cleaning device, a filtering device and a wastewater evaporation device.

The invention provides the following technical scheme:

the environment-friendly treatment device for zero discharge of wastewater for QPQ process production comprises a post-cleaning device, a filtering device and a wastewater evaporation device, wherein one end of the post-cleaning device is connected with the filtering device, and the other end of the post-cleaning device is connected with the wastewater evaporation device; the filtering device comprises a filtering tank, and a purifying layer is arranged in the filtering tank; the rear cleaning device comprises a cooling tank and a rear rinsing tank which are sequentially arranged in the process production proceeding direction, wherein the cooling tank and the rear rinsing tank are of an integrated structure, the cooling tank and the rear rinsing tank are formed by arranging a partition plate, the height of the rear partition plate I is not higher than that of the tank, and the height of the rear partition plate I is sequentially reduced in the direction opposite to the process production proceeding direction; the waste water evaporation device comprises a plurality of electric furnace bodies which are arranged at intervals, electric furnace crucibles are arranged in the electric furnace bodies, and a waste water evaporation box is arranged between the adjacent electric furnace bodies.

Preferably, the purification layer is a preliminary filtration cotton layer, an active carbon filtration layer, a zero-valent iron ball layer, a fine sand layer, a wood chip layer and a fine gravel layer in sequence according to the entering direction of water flow.

In any of the above schemes, it is preferable that the thickness of the preliminary filtration cotton layer is 1cm, the thickness of the active carbon filtration layer is 2cm, the thickness of the zero-valent iron ball layer is 2cm, the thickness of the fine sand layer is 5cm, the thickness of the wood chip layer is 2cm and the thickness of the fine gravel layer is 10cm.

In any of the above embodiments, it is preferable that the overflow tank I is provided outside the cooling tank, and the height is set to be equal to the water level of the cooling tank.

In any of the above aspects, it is preferable that the overflow tank I is provided at a height lower than a minimum height of the front partition I between the cooling tank and the rear rinse tank.

In any of the above embodiments, it is preferable that a sump I is provided below the overflow vessel I.

In any of the above embodiments, it is preferable that an air extraction system is provided at the back of the cooling tank.

In any of the above schemes, preferably, the exhaust system comprises an exhaust port, an exhaust pipeline and an exhaust fan, wherein the exhaust port is arranged above the water level line of the cooling tank, one end of the exhaust pipeline is connected with the exhaust port, the other end of the exhaust pipeline is connected with the exhaust fan, and the exhaust fan is arranged and connected to the exhaust gas discharge port of the factory.

In any of the above solutions, preferably, the air suction port is in a horn shape, and a diameter of an end far from the cooling tank is smaller than a diameter of an end near to the cooling tank.

In any of the above schemes, it is preferable that the cooling tank further comprises a water vapor baffle, wherein the water vapor baffle is U-shaped, and is connected with the cooling tank backboard, the rear partition I between the cooling tank and the rear rinsing tank, and the top of the tank body to form a water vapor condensation zone.

In any of the above aspects, it is preferable that the cooling tank is at the same level as the top of the rear rinse tank, and the water vapor condensation zone top is higher than the rinse tank.

In any of the above embodiments, it is preferable that the top of the vapor condensation zone is at the same height as the rear rinse tank, and the top of the rear partition I between the cooling tank and the rear rinse tank is L-shaped, i.e., the front half of the rear partition I is smaller than the rear half.

In any of the above embodiments, it is preferable that a portion of the rear partition I between the cooling tank and the rear rinse tank having a large height occupies 1/4 to 1/2 of the total width.

In any of the above schemes, it is preferable that the cooling tank and the rear rinsing tank are both provided with a spraying system, and the product is sprayed and pre-cleaned before leaving the water tank and entering the next water tank, so as to reduce the sewage of the last rear rinsing tank entering the next rear rinsing tank along with the product.

In any of the above aspects, it is preferable that a spray port of the spray system is provided at the back of the cooling tank and the rear rinse tank.

In any of the above aspects, it is preferable that the shower port is in fluid communication with the water inlet pipe.

In any of the above embodiments, it is preferred that all of the spray ports are in fluid communication with the same water inlet tube.

In any of the above schemes, it is preferable that the water inlet pipe is arranged in a rinsing tank at the process end of an environment-friendly treatment device for zero discharge of wastewater for QPQ process production.

In any of the above schemes, preferably, the water inlet pipe is arranged at the top of a process end rinsing tank of an environment-friendly treatment device for zero discharge of wastewater for QPQ process production.

In any of the above embodiments, it is preferable that the spray ports of each cooling tank and each rear rinse tank are connected to separate water inlet pipes, respectively.

In any of the above aspects, it is preferable that the shower opening is provided at a height higher than the water surface of the rear rinse tank.

In any of the above aspects, preferably, the cooling tank and/or the post-rinse tank includes a ventilation stirring device, and the ventilation stirring device is a compressed air ventilation pipe and adopts compressed air bubbling stirring.

In any of the above schemes, preferably, the compressed air vent pipe is Z-shaped, one end of the compressed air vent pipe is arranged at the top of the rear rinsing tank and connected with a compressed air source, and the other end of the compressed air vent pipe is directly introduced into the middle of the bottom of the rear rinsing tank to serve as an air outlet.

In any of the above embodiments, it is preferable that the rear rinse tank includes a rear rinse tank I and a rear rinse tank II, and a first partition is provided between the two rinse tanks.

In any of the above schemes, preferably, the exhaust system comprises an exhaust port, an exhaust pipeline and an exhaust fan, the exhaust port is arranged above the water level line of the cooling tank, one end of the exhaust pipeline is connected with the exhaust port, the other end of the exhaust pipeline is connected with the exhaust fan, and the exhaust fan is connected to the exhaust gas discharge port of the factory.

In any of the above schemes, it is preferable that the cooling tank further comprises a water vapor baffle plate, wherein the water vapor baffle plate is U-shaped, and is connected with the cooling tank back plate, a rear partition plate between the cooling tank and the rear rinsing tank and the top of the tank body to form a water vapor condensation zone.

In any of the above aspects, it is preferable that the cooling tank is at the same level as the top of the rear rinse tank, and the water vapor condensation zone top is higher than the rear rinse tank.

In any of the above schemes, preferably, the cooling tank and the rear rinsing tank are both provided with spraying systems, and the products are sprayed and pre-cleaned before leaving the water tank and entering the next water tank, so that sewage of the previous cleaning tank is reduced from entering the next cleaning tank along with the products.

In any of the above aspects, preferably, the spray ports are in fluid communication with a water pipe.

In any of the above embodiments, it is preferable that the shower opening is provided at a height higher than the water surface of the rear washing tub.

In any of the above schemes, preferably, a visual observation window is arranged on one side of the wastewater evaporation tank, the visual observation window is vertically arranged, and a water level mark line is arranged on the visual observation window.

In any of the above schemes, it is preferable that a dredging plate is arranged at the bottom of the wastewater evaporation tank, one end of the dredging plate is movably connected with a blocking piece, and a hook is fixedly connected on the dredging plate.

In any of the above schemes, it is preferable that at least one side of the electric furnace body is provided with a high temperature resistant fan, and the high temperature resistant fan is connected with the L-shaped air guide sleeve.

In any of the above schemes, preferably, the air inlet of the L-shaped air guide sleeve is arranged at the upper part of the electric furnace body, and the air outlet of the air guide sleeve extends to the inside of the wastewater evaporation tank.

In any of the above schemes, it is preferable that an air purifying component is arranged between the electric furnace body and the waste water evaporation tank, and the air purifying component is fixedly arranged between the electric furnace body and the waste water evaporation tank through four support columns.

In any of the above schemes, preferably, the air purifying component comprises an air purifying barrel, two ends of the air purifying barrel are respectively provided with an air inlet hole and an air outlet hole, and a turbine fan and an air purifying layer are arranged in the air purifying barrel.

In any of the above aspects, it is preferable that the wastewater evaporation tank and the electric furnace body are disposed adjacently.

In any of the above schemes, preferably, a connecting piece is arranged on one side of the plugging piece, and a fixing column matched with the connecting piece is arranged on one side of the dredging plate.

In any of the above schemes, it is preferable that two sides of the electric furnace body are respectively provided with a high temperature resistant fan, and one end of each high temperature resistant fan extends towards the adjacent wastewater evaporation tank.

In any of the above schemes, preferably, the hooks are arranged in an inverted U shape, and the height of the hooks is the same as that of the wastewater evaporation tank.

In any of the above aspects, it is preferable that the wastewater evaporation apparatus comprises at least three electric furnace bodies.

In any of the above aspects, it is preferable that the air cleaning layer is disposed at an upper portion of the air inlet hole.

In any of the above schemes, it is preferable that the air purifying layer at least comprises a filter cotton layer, an activated carbon filter layer and a HEPA filter layer, and the filter cotton layer, the activated carbon filter layer and the HEPA filter layer are sequentially arranged from bottom to top.

In any of the above aspects, it is preferable that the electric furnace body has a square cross section.

In any of the above schemes, it is preferable that the device further comprises a front cleaning device, one end of the front cleaning device is connected with the filtering device, the front cleaning device comprises a front cleaning water tank group, a ventilation stirring device and a spraying system, the front cleaning water tank group comprises an oil removing tank, a rear rinsing tank II and a rear rinsing tank I which are sequentially arranged, and the oil removing tank, the rear rinsing tank II and the spraying system are sequentially arranged

The back potcher I sets up as an organic wholely, set up preceding baffle I between back potcher I and the back potcher II, go to set up preceding baffle II between oil groove and the back potcher II, preceding baffle I highly be higher than preceding baffle II, set up overflow launder II on the outer wall of deoiling groove, preceding baffle II highly be higher than overflow launder II the top of back potcher I sets up the inlet tube.

In any of the above schemes, preferably, the aeration and stirring device comprises a compressed air aeration pipe, the compressed air aeration pipe is in a Z-type arrangement, and one end of the compressed air aeration pipe extends into the middle of the oil removal tank, the middle of the rear rinsing tank II and/or the middle of the rear rinsing tank I.

In any of the above aspects, preferably, the compressed air vent pipe is externally connected with compressed air. In any of the above embodiments, it is preferable that the aeration-agitation device is provided in each of the oil removal tank, the rear rinse tank II, and the rear rinse tank I.

In any of the above aspects, preferably, the spray system comprises a spray pipe.

In any of the above schemes, it is preferable that spray ports are provided on the outer walls of the oil removal tank, the rear rinse tank II and the rear rinse tank I.

In any of the above embodiments, it is preferable that the spray ports are provided at middle or upper portions of outer walls of the oil removal tank, the rear rinse tank II and the rear rinse tank I. In any of the above embodiments, it is preferable that the height of the front partition I is 5cm higher than the front partition II.

In any of the above embodiments, it is preferable that the height of the front partition I is lower than the height of the outer wall of the front wash tub group.

In any of the above embodiments, it is preferable that a sump II is provided below the overflow vessel II.

The invention also provides a treatment method of the environment-friendly treatment device for the wastewater zero emission in QPQ process production, which comprises a post-cleaning device, a filtering device and a wastewater evaporation device, wherein one end of the post-cleaning device is connected with the filtering device, the other end of the post-cleaning device is connected with the wastewater evaporation device, the filtering device filters a water body and then is used by the post-cleaning device, and the wastewater after the post-cleaning device is used is evaporated by the wastewater evaporation device.

Preferably, the filtering device comprises a filtering tank, and a purifying layer is arranged in the filtering tank; the rear cleaning device comprises a cooling tank and a rear rinsing tank which are sequentially arranged in the process production proceeding direction, wherein the cooling tank and the rear rinsing tank are of an integrated structure, the cooling tank and the rear rinsing tank are formed by arranging a partition plate, the height of a front partition plate I is not higher than that of the tank, and the height of the front partition plate I is sequentially reduced in the direction opposite to the process production proceeding direction; the waste water evaporation device comprises a plurality of electric furnace bodies which are arranged at intervals, electric furnace crucibles are arranged in the electric furnace bodies, and a waste water evaporation box is arranged between the adjacent electric furnace bodies.

In any of the above schemes, it is preferable that the purifying layer is a preliminary filtering cotton layer, an active carbon filtering layer, a zero-valent iron ball layer, a fine sand layer, a wood chip layer and a fine gravel layer in order according to the water flow entering direction.

In any of the above schemes, it is preferable that the cooling tank further comprises a water vapor baffle, wherein the water vapor baffle is U-shaped, and is connected with the cooling tank backboard, the front partition board I between the cooling tank and the rear rinsing tank, and the top of the tank body to form a water vapor condensation zone.

In any of the above embodiments, it is preferable that the top of the vapor condensation zone is at the same height as the rear rinse tank, and the top of the front partition I between the cooling tank and the rear rinse tank is L-shaped, i.e., the front half of the front partition I is smaller than the rear half.

In any of the above embodiments, it is preferable that a portion of the front partition I between the cooling tank and the rear rinse tank, which is large in height, occupies 1/4 to 1/2 of the total width.

In any of the above schemes, it is preferable that the cooling tank further comprises a water vapor baffle plate, wherein the water vapor baffle plate is U-shaped, and is connected with the cooling tank back plate, the first partition plate between the cooling tank and the rear rinsing tank, and the top of the tank body to form a water vapor condensation zone.

In any of the above schemes, preferably, the air purifying component includes an air purifying barrel, two ends of the air purifying barrel are respectively provided with an air inlet hole) and an air outlet hole, and a turbine fan and an air purifying layer are arranged in the air purifying barrel.

In any of the above schemes, preferably, the device further comprises a front cleaning device, one end of the front cleaning device is connected with the filtering device, the front cleaning device comprises a front cleaning water tank group, a ventilation stirring device and a spraying system, the front cleaning water tank group comprises an oil removing tank, a rear rinsing tank II and a rear rinsing tank I which are sequentially arranged, the oil removing tank, the rear rinsing tank II and the rear rinsing tank I are integrally arranged, a front partition board I is arranged between the rear rinsing tank I and the rear rinsing tank II, a front partition board II is arranged between the oil removing tank and the rear rinsing tank II, the front partition board I is higher than the front partition board II, an overflow tank II is arranged on the outer wall of the oil removing tank, and the front partition board II is higher than the overflow tank II. The three water tanks of the front cleaning device are arranged to be submerged pump water drainage, and the submerged pump can extend into the three water tanks to pump water. The three water tanks are not provided with drain pipes, the drain water is sequentially extracted by adopting a submersible pump, and the extraction sequence is as follows: the sewage from the oil removal tank is directly pumped into a filtering device for filtering, and the rinsing tank water is pumped into the oil removal tank for use. Of course, the bottom of the front baffle I can be a water outlet, which is sealed at ordinary times and opened during water discharge.

The water inlet pipe in the invention can be a tap water inlet pipe or a water inlet pipe which can be reused after wastewater treatment. The furnace-entering cleaning flow of the QPQ process is carried out in a front cleaning device, and the front cleaning aims at removing stains, greasy dirt and the like of products; the sewage discharge of the pre-cleaning, mainly oil stain and metal cleaning liquid, is filtered and then put into an environment-friendly treatment device with zero discharge of wastewater for QPQ process production for recycling. The pre-cleaning device of the invention is designed to control and reduce water consumption from the source in view of recycling water and saving water. The directions of the QPQ process are the oil removal tank, the rear rinsing tank II and the rear rinsing tank I.

In any of the above embodiments, it is preferable that a sump II is provided below the overflow vessel II. When the oil removal tank is full, sewage overflows from the overflow tank II to the water collection pit for storage.

The beneficial effects are that:

the invention provides an environment-friendly treatment device and a treatment method for zero discharge of wastewater for QPQ process production, comprising a front cleaning device, a rear cleaning device, a sewage filtering device and a wastewater evaporating device.

Drawings

FIG. 1 is a block diagram of a production flow of a QPQ process;

FIG. 2 is a schematic diagram of the flow of wastewater produced by QPQ process of the present invention;

FIG. 3 is a schematic diagram of the overall structure of a preferred embodiment of an environmental protection treatment apparatus for zero wastewater discharge for QPQ process production according to the present invention;

FIG. 4 is a schematic diagram of the overall structure of another preferred embodiment of the environmental protection treatment apparatus for zero wastewater discharge for QPQ process production of the present invention;

FIG. 5 is a cross-sectional view of the filter arrangement of FIG. 3;

FIG. 6 is a schematic view of the post-cleaning apparatus of FIG. 3;

fig. 7 is a front view of the post-cleaning device shown in fig. 6.

Fig. 8 is a schematic view of the structure of a preferred embodiment of the water vapor barrier of the post-cleaning device.

Fig. 9 is a schematic view of a structure of another preferred embodiment of the water vapor barrier of the post-cleaning device.

Fig. 10 is a schematic view of the structure of another preferred embodiment of the water vapor barrier of the post-cleaning device.

Fig. 11 is a schematic structural view of another preferred embodiment of the water vapor barrier of the post-cleaning device.

FIG. 12 is a schematic view of another preferred embodiment of a water vapor barrier of the post-cleaning device

FIG. 13 is a front view of another preferred embodiment of the post-cleaning device;

FIG. 14 is a schematic view showing the overall structure of the wastewater evaporation apparatus of FIG. 3;

FIG. 15 is a partial schematic view of the structure of FIG. 14;

FIG. 16 is another partial schematic view of the structure of FIG. 14;

FIG. 17 is a schematic view of the usage state of FIG. 16;

FIG. 18 is a further partial cross-sectional view of the structure of FIG. 14;

FIG. 19 is a schematic view of the overall structure of the front cleaning device of FIG. 4;

fig. 20 is a partial structural schematic diagram of embodiment 7;

FIG. 21 is an exploded view of the structure of FIG. 20;

FIG. 22 is a schematic view of a portion of the structure of FIG. 21;

FIG. 23 is an exploded view of a portion of the structure of FIG. 22;

fig. 24 is a cross-sectional view of the structure of fig. 22.

Detailed Description

The present invention will be described in detail with reference to specific examples for further understanding of technical features of the present invention. The examples are given solely for the purpose of illustration and are not intended to be limiting, as any insubstantial modifications made by a person skilled in the art based on the description herein shall fall within the scope of the invention.

An environmental protection treatment device of QPQ technology waste water zero release for production, the main part is by: the device comprises a front cleaning device, a rear cleaning device, a sewage filtering device and a wastewater evaporating device. In QPQ production process, waste water is produced in front belt cleaning device and back belt cleaning device, evaporates in back belt cleaning device and waste water evaporation plant, and waste water filter equipment plays the effect of waste water recovery recycle as the physical separation device of waste water. The relationship between these four parts is shown in fig. 2, and clean washing water (tap water) can be added to the front and rear washing lines, respectively. The waste water after the front cleaning is discharged into a waste water filtering device, filtered by the filtering device, and the filtrate is discharged into a rear cleaning device for repeated use, and the filtered waste residues are recycled according to the solid waste; the waste water generated by the post-cleaning device is discharged into a waste water evaporation system, and is changed into water vapor after evaporation, and evaporation residues are recycled according to solid waste; and the mud sediment of the post-cleaning device is discharged by a wastewater filtering device for filtering and recycling, the filtrate is discharged into the post-cleaning device for recycling, and the filtering slag is recycled according to the solid waste.

Under special conditions, the environment-friendly treatment device with zero wastewater discharge for QPQ process production does not need to be cleaned before being directly put into a furnace for production, so that the front cleaning device part is not needed. In this case, the invention need only consist of 3 parts, namely: the waste water evaporating device, the post-cleaning device and the filtering device. Example 1:

as shown in FIG. 1, the environment-friendly treatment device for zero discharge of wastewater for QPQ process production comprises a post-cleaning device, a filtering device and a wastewater evaporation device, wherein one end of the post-cleaning device is connected with the filtering device through a water pipe, and the other end of the post-cleaning device is connected with the wastewater evaporation device through a water pipe; the filter device comprises a filter tank 1, wherein a purification layer 2 is arranged in the filter tank 1, as shown in fig. 5, the purification layer sequentially comprises a preliminary filtration cotton layer 21, an activated carbon filter layer 22, a zero-valent iron ball layer 23, a fine sand layer 24, a wood chip layer 25 and a fine gravel layer 26 according to the entering direction of water flow, and geotechnical cloth is adopted between the adjacent preliminary filtration cotton layer 21, the activated carbon filter layer 22, the zero-valent iron ball layer 23, the fine sand layer 24, the wood chip layer 25 and the fine gravel layer 26. The thickness of the preliminary filtration cotton layer is 1cm, the thickness of the active carbon filter layer is 2cm, the thickness of the zero-valent iron ball layer is 2cm, the thickness of the fine sand layer is 5cm, the thickness of the wood chip layer is 2cm and the thickness of the fine gravel layer is 10cm. Tap water or waste water is filtered by the filtering device and then is used by the post-cleaning device.

As shown in fig. 6, the post-cleaning device comprises a cooling tank 3 and a post-rinsing tank which are sequentially arranged in the process production proceeding direction, wherein the post-rinsing tank comprises a first post-rinsing tank 4 and a second post-rinsing tank 5, the cooling tank 3 and the post-rinsing tank are of an integrated structure, the cooling tank 3 and the post-rinsing tank are formed by arranging a rear partition board I6, the height of the rear partition board I6 is not higher than the height of the tank, and the height of the rear partition board I6 is sequentially reduced in the direction opposite to the process production proceeding direction; the rear washing apparatus is formed as an integral rectangular tank body, that is, a cooling tank 3, a first rear rinsing tank 4 and a second rear rinsing tank 5 are formed by adding a rear partition I6 to the rectangular tank, and the height of the rear partition I6 is the water level. The height of the rear partition I6 is reduced from the rear rinsing tank to the cooling tank 3 in sequence, thereby ensuring that tap water overflows from the cleanest rinsing tank to the cooling tank 3 in sequence. The rear partition board I6 includes, i.e., a first rear partition board I61 and a second rear partition board I62.

An overflow groove I7 is arranged outside the cooling groove 3, and the arrangement height of the overflow groove I7 is the same as the water level line 8 in the cooling groove 3 and is lower than the minimum height of the first rear partition plate I61. To ensure that the water stream overflows from less to more contaminant content, the height of the rear baffles I6 increases in sequence in the direction of process progression, i.e. the minimum height of the first rear baffle I61 is less than the height of the second rear baffle I62. The first rear partition I61 between the cooling tank 1 and the first rear rinsing tank 4 is L-shaped, and the height of the smaller part is the water line 8 of the first rear rinsing tank 4, which is greater than the set height of the overflow tank I7, i.e. higher than the water line 7 in the cooling tank 3, preferably by about 5cm, so that the sewage in the cooling tank 3 does not reversely enter the first rear rinsing tank 4 to pollute the water in the first rear rinsing tank 4 while achieving the normal function of the cooling tank 3. The second rear partition I62 between the first rear rinse tank 4 and the second rear rinse tank 5 has a height greater than the first rear partition I61, preferably also about 5cm, and prevents the water in the first rear rinse tank 4 from reversely entering the second rear rinse tank 5 while also achieving the normal function of the first rear rinse tank 4. The number of post-rinse tanks may be increased or decreased as appropriate.

The post-cleaning device of the QPQ process production line is also provided with a water collecting pit 9, and when the cooling tank 1 is full of water, sewage overflows from the overflow tank I7 to the water collecting pit 9 for storage.

In order to discharge a large amount of water vapor generated in the cooling tank 3 from the heated product, an exhaust system is additionally arranged at the back of the cooling tank 3 on the basis of the cleaning device or the existing structure after the QPQ process production line, the exhaust system consists of an exhaust port 10, an exhaust pipeline 11 and an exhaust fan, the exhaust port 10 is in a horn shape to enlarge the exhaust efficiency, the exhaust system is arranged above a water line 8 of the cooling tank 3, one end with a large diameter is arranged on a plane of a backboard of the cooling tank 3, one end with a small diameter is connected with an exhaust channel 11, the other end of the exhaust channel 11 is connected with the exhaust fan, and the exhaust fan is connected to an exhaust gas discharge port of a factory so as to discharge the water vapor generated in the cooling tank 3 from the working environment, thereby avoiding influencing the production. The air draft system is mainly used for extracting a large amount of water vapor generated when the product is rapidly cooled.

In order to obtain better steam discharging effect, on the basis of the structure of the post-cleaning device of the QPQ process production line provided with an air suction system, a steam baffle 12 is arranged at the back of the cooling tank 3, the steam baffle 12 is U-shaped and is arranged at the top of the cooling tank 3, a semi-surrounding state is formed around the steam suction opening 10, and a steam condensation area is formed, so that when a product is cooled, the suction opening 10 can suck and discharge steam generated by cooling, and meanwhile, when a spraying opening sprays, the spraying water can be prevented.

Two implementation modes are provided, as shown in fig. 7, the top of the steam baffle 12 is flush with the rear rinsing tank, in this case, the height of the cooling tank is smaller than that of the rear rinsing tank, then the U-shaped steam baffle 12 is arranged at the top of the cooling tank 3, and the steam baffle 12 is connected with the back plate of the cooling tank 3, the first front baffle I61 and the top of the side plate of the tank body installation overflow tank I7; the upper part of the cooling tank 3 may be directly used as the vapor baffle 12, and at this time, the back plate of the cooling tank 3, the side plate provided with the overflow tank I7 and the rear half part of the first front baffle I61 (preferably, the part with the higher rear height occupies 1/4-1/2 of the total width) form a vapor condensation zone; as shown in fig. 13, the height of the cooling tank 3 is the same as that of the rear rinsing tank, a U-shaped water vapor baffle 12 is arranged at the top of the cooling tank 3, the water vapor baffle 12 is connected with the back plate of the cooling tank 3, the first front baffle plate I61 and the top of the side plate of the tank body installation overflow tank I7, at this time, the top of the water vapor condensation area is higher than that of the rear rinsing tank, and in this case, the width of the water vapor baffle 12 and the width of the side plate of the cooling tank for the installation overflow tank I7 may be consistent or inconsistent.

In order to effectively reduce the sewage of the last back rinsing tank, reduce the water replacement frequency along with the product entering the next back rinsing tank, save water resources and protect the environment, on the basis of the post-cleaning device of the QPQ process production line or the existing structure, a spraying system is arranged on each of the cooling tank 3, the first back rinsing tank 4 and the second back rinsing tank 5, a spraying opening 13 of the spraying system is arranged on the back parts of the cooling tank 3, the first back rinsing tank 4 and the second back rinsing tank 5, the product is sprayed and pre-cleaned by tap water through the spraying opening 13 on the back part of the back rinsing tank before the product leaves the back rinsing tank and enters the next back rinsing tank, the sewage of the last back rinsing tank can be effectively reduced along with the product entering the next back rinsing tank, meanwhile, the water of the back rinsing tank can be supplemented, for example, in the cooling tank 3, the water can be reduced due to the evaporation of the water, the reduced water can be supplemented, and the water can be sprayed and supplemented into the overflow tank after the overflow tank. All the spraying ports 13 can be connected with the same water inlet pipe 14 together, and the water inlet pipe 14 can be connected with a filtering device and is arranged at the top of the second rear rinsing tank 5 as shown in fig. 3; of course, the spray openings 13 in each rear rinse tank may also be connected to separate water inlet pipes 14. Preferably, the spray opening 13 is mounted on the upper half of the back of the rear rinse tank, e.g., above the water level of the rear rinse tank. When the product is washed in the water tank and lifted out of the water tank, the spraying system corresponding to the water tank is started to spray, and the washing sewage on the product can be flushed into the water tank along with the spraying water, so that the carrying amount of the washing wastewater on the product can be reduced to the greatest extent, and the purpose of saving water is achieved.

In order to further enhance the cleaning effect, on the basis of the post-cleaning device of the QPQ process production line or the existing structure, an aeration stirring device can be optionally arranged in the post-rinsing tank 6, for example, compressed air is used as an air source, and bubbling stirring is performed through a compressed air aeration pipe 15. It is also possible to choose to provide aeration-agitation means in the cooling tank 3 or to provide aeration-agitation means in both the cooling tank 3 and the first rear rinse tank 4 and the second rear rinse tank 5. The compressed air breather pipe 15 can be Z-shaped, and one end is arranged at the top of the rear rinsing tank 6 and is connected with a compressed air source, and the other end is directly introduced into the middle of the bottom of the rear rinsing tank 6 to be used as an air outlet, and is attached to the rear rinsing tank body, so that inconvenience in cleaning a product is avoided. When the product is cleaned in the water tank, the breather pipe is opened for stirring and cleaning.

This QPQ technology production line back belt cleaning device, three basin do not set up the drain pipe, need the drainage to adopt the immersible pump to take out in proper order, and its extraction order is: the waste water of the cooling tank 3 is pumped into an evaporation device; the water in the back rinsing tank 6 is pumped into the cooling tank 3 for use through the submersible pump, so that the water recycling is realized, and the waste of water resources is avoided.

This QPQ technology production line back belt cleaning device, three basin also can set up the drain pipe, and the drain pipe sets up in the basin lower part, and during the drainage, the waste water of first row cooling tank 3 is extracted into evaporation plant, opens the drain pipe in the back potcher 6 again, and water inflow cooling tank 3 is followed to be extracted into evaporation plant, realizes water cyclic utilization, avoids the water waste.

In order to recycle the cleaning wastewater, the wastewater of the front cleaning device can be discharged into the rear cleaning device for recycling after being processed by the wastewater filtering treatment system.

As shown in fig. 14, the waste water evaporation device comprises a plurality of electric furnace bodies 16, three electric furnace bodies 16 are arranged at intervals, electric furnace crucibles 17 are arranged in the electric furnace bodies 16, and a waste water evaporation tank 18 is arranged between adjacent electric furnace bodies 16. The cross section of the electric furnace body 16 is square, so that the contact area between the electric furnace body 16 and the waste water evaporation tank 18 is increased, the heat conduction is increased, and the evaporation speed is increased.

As shown in fig. 15, a visual observation window 19 is arranged on one side of the wastewater evaporation tank 18, the visual observation window 19 is vertically arranged, a water level mark line is arranged on the visual observation window 19, the visual observation window 19 is made of transparent high-temperature-resistant materials and is used for observing the amount of wastewater in the wastewater evaporation tank, and timely water adding or dredging is facilitated.

The bottom of the waste water evaporation tank 18 is provided with a dredging plate 20, as shown in fig. 16-17, one end of the dredging plate 20 is movably connected with a blocking piece 27, a hook 28 is fixedly connected on the dredging plate 20, two sides of the electric furnace body 16 positioned in the middle are respectively provided with a high-temperature-resistant fan 29, and the inner sides of the electric furnace bodies 16 positioned at the two sides are respectively provided with a high-temperature-resistant fan 29. One end of the high temperature resistant fan 29 extends toward the adjacent waste water evaporation tanks 18, respectively.

The high temperature resistant fan 29 is connected with the L-shaped air guide sleeve 30, an air inlet of the air guide sleeve 30 is arranged at the upper part of the electric furnace body 16, and an air outlet of the air guide sleeve 30 extends to the inside of the wastewater evaporation tank 18. An air purifying part is arranged between the electric furnace body 16 and the waste water evaporation tank 18, and as shown in fig. 18, the air purifying part purifies the air, so that the hot steam is prevented from being discharged into the air, and the air is prevented from being polluted.

The fixed setting of air purification part passes through four support columns 31 between electric stove furnace body 16 and waste water evaporation case 18, and the air purification part includes air purification bucket 32, and air purification bucket 32's both ends are equipped with fresh air inlet 33 and fresh air outlet 34 respectively, are equipped with turbo fan 35 and air purification layer in the air purification bucket 32, and the air purification layer is including filtering cotton layer, active carbon filter layer and HEPA filter layer at least, and filtering cotton layer, active carbon filter layer and HEPA filter layer set gradually from the bottom up.

When the electric furnace body 16 is used in a heating mode, waste heat of the electric furnace body 16 is transferred to the waste water evaporation tank 18, waste water in the waste water evaporation tank 18 is heated by the waste heat, high-temperature resistant fans 29 are arranged on two sides of the electric furnace body 16, dry hot air around the electric furnace body 16 is continuously blown into the adjacent waste water evaporation tank 18 by the high-temperature resistant fans 29, the utilization rate of the hot air on the upper portion of the electric furnace body 16 is improved, and therefore the waste water evaporation speed in the waste water evaporation tank 18 is accelerated.

The bottom of the waste water evaporation tank 18 is provided with a dredging plate 20, when the solid in the dredging plate 20 is observed to be full from the visual observation window 19, the dredging plate 20 is pulled out directly through the hook 28, one side of the plugging piece 27 is provided with a connecting piece 36, one side of the dredging plate 20 is provided with a fixing column 37 which is matched with the connecting piece 36, the connecting piece 36 is opened, the plugging piece 27 and the dredging plate 19 are positioned on the same plane, and the internal solid is poured out.

A QPQ production line has at least 3 electric furnace bodies 16, and at least 2 wastewater evaporation tanks 18 can be placed between the three electric furnace bodies 16. According to the estimation of 50 kilowatts of power of a common medium-sized electric furnace, 3 electric furnace bodies 16 are simultaneously started to have 150 kilowatts of power. Assuming that the QPQ process line is operated for 12 hours at full power for 1 day, the furnace shell heat dissipation loss is about 20% of the total power, and the furnace shell heat dissipation loss is about 360 kilowatt-hours. We calculate with about 30% of the furnace shell heat dissipation power, i.e. 100 kwh. This 100 kilowatt-hour electrical energy is sufficient to evaporate about 30 kg of industrial waste water, if reasonably utilized. As estimated above, a medium QPQ production line consisting of 3 electric furnace bodies 16 can be equipped with two wastewater evaporation systems, and can evaporate about 2 tons of wastewater in one month under full load operation. The evaporation capacity of the two tons of wastewater is enough to meet the wastewater treatment capacity of most QPQ industrial production under the condition of saving water by the washing line circulation.

Example 2:

unlike the embodiment 1, the environment-friendly treatment device with zero wastewater discharge for QPQ process production further comprises a front cleaning device, as shown in fig. 4 and 19, one end of the front cleaning device is connected with the filtering device, the front cleaning device comprises a front cleaning water tank group, a ventilation stirring device and a spraying system, the front cleaning water tank group comprises a de-oiling tank 38, a rear rinsing tank II39 and a rear rinsing tank I40 which are sequentially arranged, the de-oiling tank 38, the rear rinsing tank II39 and the rear rinsing tank I40 are integrally arranged, a front partition I41 is arranged between the rear rinsing tank I39 and the rear rinsing tank II40, a front partition II42 is arranged between the de-oiling tank 38 and the rear rinsing tank II39, the height of the front partition I41 is higher than that of the front partition II42, an overflow tank II43 is arranged on the outer wall of the de-oiling tank 38, the height of the front partition II42 is higher than that of the overflow tank II43, and a water inlet pipe 44 is arranged above the rear rinsing tank I40.

The ventilation stirring device comprises a compressed air ventilation pipe 45, wherein the compressed air ventilation pipe 45 is arranged in a Z shape, and one end of the compressed air ventilation pipe 45 extends into the middle of the oil removal tank 38, the middle of the rear rinsing tank II39 and/or the middle of the rear rinsing tank I40. The outer end of the compressed air vent pipe 45 is connected with compressed air. The aeration agitation devices are provided for each of the oil removal tank 38, the rear rinse tank II39, and the rear rinse tank I40.

The spray system includes spray ports 46. Spray ports 46 are provided on the outer walls of the de-oiling tank 38, the rear rinse tank II39, and the rear rinse tank I40. Spray ports 46 are provided in the middle or upper portions of the outer walls of the degreasing bath 38, the rear rinse bath II39, and the rear rinse bath I40.

The height of the front partition I41 is 5cm above the distance of the front partition II 42. The height of the front baffle II42 is 5cm above the overflow trough II 43. The height of the front baffle I41 is lower than the height of the outer wall of the front cleaning water tank group.

A sump 47 is provided below the overflow launder II 43. When the de-sump water 38 is full, the waste water overflows from overflow sump II43 to sump 47 for storage.

The water inlet pipe 44 in the present invention may be a tap water inlet pipe. The front cleaning device mainly comprises a front cleaning water tank group, an aeration stirring device and a spraying system.

The front cleaning water tank group comprises 1 deoiling tank 38,2 rinsing tanks, three water tanks are arranged in a rectangular tank body, the middle is separated by a short partition plate, the height of the partition plate is the height of the water level, the height of the partition plate is sequentially reduced from the rinsing tank to the deoiling tank 38, tap water is ensured to sequentially overflow from the cleanest rinsing tank to the sewage tank, finally, an overflow tank II43 is arranged outside the sewage tank, the height of the overflow tank II43 is the lowest, and the height of the overflow tank II is the designed height of the water level of the deoiling tank 38 (namely the water level line 48). When the de-oiling tank 38 is full, the sewage overflows from the overflow tank II43 to the water collection pit 47 for storage. The water in the sump 47 is pumped into the filter device by a water pump and filtered for use by a post-cleaning device.

The three water tanks are not provided with drain pipes, the drain water is sequentially extracted by adopting a submersible pump, and the extraction sequence is as follows: the sewage from the oil removal tank 38 is directly pumped into a filtering device for filtering, and the rinsing tank water is pumped into the oil removal tank 38 for use.

Of course, this may be a drain port provided on the same horizontal plane as the sump 47, and when the drain port at the oil removal tank 38 is opened first, and the water is drained, the drain port in the rinsing tank is sequentially opened, and finally the water flows into the sump 47 through the oil removal tank 38, is filtered by the water pump, and is supplied to the post-cleaning device.

The ventilation stirring device adopts compressed air to blow and stir so as to strengthen the cleaning effect. The three tanks are respectively connected with a compressed air vent pipe 45, the air pipe is Z-shaped, the outer end of the air pipe is connected with compressed air, and the air outlet in the tank is directly led into the middle of the tank. And when the product is rinsed in the rinsing tank, opening the vent pipe to stir and clean.

The spraying system adopts tap water for spraying, when the product is rinsed in the water tank and lifted out of the water tank, the spraying system corresponding to the water tank is started and is sprayed by tap water, and the cleaning sewage on the product can be flushed into the water tank along with the spraying water, so that the carrying amount of the cleaning sewage on the product can be reduced, and the purpose of saving water is achieved.

Example 3:

this example is based on example 2: the aeration and agitation system includes a compressed air aeration pipe 45, the compressed air aeration pipe 45 is provided in a Z-shape, and one end of the compressed air aeration pipe 45 extends into the middle of the de-oiling tank 38, the middle of the rear rinse tank II40, and/or the middle of the rear rinse tank I39.

The outer end of the compressed air vent pipe 45 is connected with compressed air. The de-oiling tank 38, the rear rinse tank II40, and the rear rinse tank I39 are all provided with the aeration-agitation system. The spray system includes a spray pipe. Spray nozzles 46 are provided on the outer walls of the de-oiling tank 38, the rear rinse tank II40, and the rear rinse tank I39. The shower nozzles 46 are provided at the middle or upper portions of the outer walls of the degreasing bath 38, the rear rinse bath II40, and the rear rinse bath I46.

The height of the front partition I41 is 5cm above the distance of the front partition II 42. The height of the front baffle II42 is 5cm above the overflow trough II 43. Further, the height of the front partition plate I41 is lower than the height of the outer wall of the washing tub group.

A sump 47 is provided below the overflow launder II 43. When the oil removal tank 38 is full, sewage overflows from the overflow tank II43 to the water collection pit 47 for storage, and the water pump pumps the water in the water collection pit 47 to the filtering device for filtering and then to the post-cleaning device for use.

Example 4

An environmental protection treatment device for zero discharge of wastewater in QPQ process production is the same as in the embodiment 1, except that the steam baffle 12 can be movably connected with related components or fixed with related structures. The water vapor barrier 12 may be manually set in place or may be automatically set when it is movably connected to the relevant part.

As shown in fig. 8-12, the steam baffle 12 may be a flat plate, and a recess 121 is provided on a side near the front of the cooling tank, so that the part lifting device can move normally, and the length of the steam baffle 12 may be greater than the length of the cooling tank 3, or the length of the steam baffle may be the same as the length of the cooling tank 3, and may be supported and connected by the cooling tank 3.

As shown in fig. 9, the structure of the vapor barrier 12 may be that the vapor barrier 12 is U-shaped, and the vapor barrier left side plate 122, the vapor barrier right side plate 123, and the vapor barrier back plate 124 of the U-shaped vapor barrier 12 are respectively connected to the top of the tank body left side plate, the first rear partition I61, and the cooling tank back plate, and the length of the vapor barrier left side plate 122 connected to the top of the tank body left side plate is the same as that of the tank body left side plate, that is, the left side plate 122 of the vapor barrier 12 is longer than the right side plate 123.

As shown in fig. 10, the structure of the vapor baffle 12 may be that the vapor baffle 12 is U-shaped, and the vapor baffle left side plate 122, the vapor baffle right side plate 123 and the vapor baffle back plate 124 of the U-shaped vapor baffle are respectively connected with the tank body left side plate, the first rear partition I61 and the top of the cooling tank back plate, and the length of the vapor baffle left side plate 122 connected with the top of the tank body left side plate is the same as that of the tank body left side plate, that is, the lengths of the left side plate 122 and the right side plate 123 of the vapor baffle 12 are the same.

The structure of the steam baffle 12 can be further as shown in fig. 11-12, the U-shaped steam baffle 12 further comprises a top cover 125, and a notch 121 is arranged on one side of the top cover 125 near the front part of the cooling tank, so that the part lifting device can normally move.

Example 5

The invention also provides a treatment method of the environment-friendly treatment device for the wastewater zero emission in QPQ process production, which comprises a post-cleaning device, a filtering device and a wastewater evaporation device, wherein one end of the post-cleaning device is connected with the filtering device, the other end of the post-cleaning device is connected with the wastewater evaporation device, the filtering device filters a water body and then is used by the post-cleaning device, and the wastewater after the post-cleaning device is used is evaporated by the wastewater evaporation device, and the post-cleaning device, the filtering device and the wastewater evaporation device have the same structure as in the embodiment 1.

Example 6

A treatment method of an environment-friendly treatment device for zero discharge of wastewater for QPQ process production is the same as in the embodiment 5, except that the treatment device further comprises a front cleaning device, and the front cleaning device has the same structure as in the embodiment 2.

Example 7

Unlike example 1,

as shown in fig. 20 to 24, the filter device comprises a filter core pressing ring 53, a filter core 52, a filter box liner 49 and a filter tank 1.

The filter tank 1 is internally provided with a filter tank liner 49, the size of the filter tank liner 49 is slightly smaller than that of the filter tank 1, filter holes 50 are uniformly distributed at the bottom of the filter tank liner 49, filtered liquid flows out of the filter holes 50, the sizes phi 10-phi 30mm of the filter holes 50 are unlimited, and the flow of the filtered liquid is convenient.

The upper edge of the inner container 49 of the filter box is provided with an arc handle 51, and the upper parts of the two sides of the inner container 49 of the filter box are provided with arc handles 51. The inner container 49 of the filter box is suspended and fixed in the filter tank 1 through an arc handle 51. The arc handle 51 further facilitates the lifting of the filter tank liner 49 from the filter tank 1. The inner container 49 of the filter box is suspended and fixed in the filter tank 1, and the inner container 49 of the filter box is of a barrel-shaped structure. The filter tank inner container 49 and the filter tank 1 are concentrically arranged, a plurality of filter holes 50 are formed in the bottom of the filter tank inner container 49, a filter element 52 is fixed through the filter tank inner container 49, a filter element press ring 53 is arranged on the upper portion of the filter element 52, and the filter element press ring 53 is used for compacting the filter element 52 so as to prevent the filter element 52 from floating.

The filter element 52 is internally provided with a fixed rod 54, the fixed rod 54 is rod-shaped, the middle layer is horizontally arranged in the filter element 54, the fixed rod 54 is vertically and fixedly connected with the middle rod 55, and the hanging ring 56 is fixedly connected with the upper part of the middle rod 55, so that the filter element 52 is convenient to replace.

Example 8

Unlike example 7, the environmental protection treatment device for zero discharge of wastewater for QPQ process production,

as shown in fig. 20-24, the filter cartridge 52 includes a first plastic screen 521 and a second plastic screen 522, with a first asbestos 723, a second asbestos 524, and a diatomite layer 525 wrapped between the first plastic screen 521 and the second plastic screen 722. The first plastic screen 521, the first asbestos layer 523, the diatomite layer 525, the second asbestos layer 524 and the second plastic screen 522 are sequentially arranged from top to bottom.

The working principle of the filtering device is as follows: the filter element 52 is placed in the filter box liner 49, and the filter element compression ring 53 is pressed on the filter element 52; the filter box liner 49 is then placed into the filter tank 1. When the waste water is discharged, the waste water is directly discharged into the assembled inner container 49 of the filter box, the waste water flows through the filter element 52 under the action of self gravity, particles in the waste water are remained on the upper part of the filter element 52 or inside the filter element 52, and clean filtrate enters the filter tank 1 and is recycled.

The invention can filter and separate QPQ industrial wastewater, the filtrate is recycled continuously, the filter residue is treated as solid waste by a third party, and the invention has the characteristics of simple and durable equipment, good filtering and separating effect, convenient operation and low cost, and the filtrate can be recycled, thereby saving water resources and reducing production cost.

Claims

1. The environment-friendly treatment device for zero discharge of wastewater for QPQ process production comprises a post-cleaning device, a filtering device and a wastewater evaporation device, wherein one end of the post-cleaning device is connected with the filtering device, and the other end of the post-cleaning device is connected with the wastewater evaporation device; the filtering device comprises a filtering tank, and a purifying layer is arranged in the filtering tank; the rear cleaning device comprises a cooling tank and a rear rinsing tank which are sequentially arranged in the process production proceeding direction, wherein the cooling tank and the rear rinsing tank are of an integrated structure, the cooling tank and the rear rinsing tank are formed by arranging a partition board, the height of the rear partition board I is not higher than that of the tank, and the height of the rear partition board I is sequentially reduced in the direction opposite to the process production proceeding direction; the waste water evaporation device comprises a plurality of electric furnace bodies which are arranged at intervals, an electric furnace crucible is arranged in each electric furnace body, and a waste water evaporation box is arranged between every two adjacent electric furnace bodies;

The air purifying component is fixedly arranged between the electric furnace body and the wastewater evaporation box through four support columns.

2. The environmentally friendly treatment device for zero discharge of waste water for QPQ process production according to claim 1, wherein: the outside of the cooling tank is provided with an overflow tank I, and the height of the overflow tank I is equal to that of the water level line of the cooling tank.

3. The environmentally friendly treatment device for zero discharge of waste water for QPQ process production according to claim 2, wherein: and a water collecting pit I is arranged below the overflow groove I.

4. The environmentally friendly treatment device for zero discharge of waste water for QPQ process production according to claim 1, wherein: the rear cleaning device further comprises a water vapor baffle which is U-shaped and is connected with the cooling tank backboard, the rear partition board I between the cooling tank and the rear rinsing tank and the top of the tank body to form a water vapor condensation area.

5. The environmentally friendly treatment device for zero discharge of waste water for QPQ process production according to claim 1, wherein: the cooling tank and/or the rear rinsing tank comprises a ventilation stirring device, wherein the ventilation stirring device is a compressed air ventilation pipe and adopts compressed air bubbling stirring.

6. The environmentally friendly treatment device for zero discharge of waste water for QPQ process production according to claim 1, wherein: one side of the wastewater evaporation tank is provided with a visual observation window, the visual observation window is vertically arranged, and a water level mark line is arranged on the visual observation window.

7. The environmentally friendly treatment device for zero discharge of waste water for QPQ process production of claim 6, wherein: the bottom of the wastewater evaporation tank is provided with a dredging plate, one end of the dredging plate is movably connected with a blocking piece, and a hook is fixedly connected on the dredging plate.

8. The environmentally friendly treatment device for zero discharge of waste water for QPQ process production according to claim 1, wherein: at least one side of the electric furnace body is provided with a high temperature resistant fan which is connected with the L-shaped guide cover.

9. The environmentally friendly treatment device for zero discharge of waste water for QPQ process production according to claim 1, wherein: still include front cleaning device, front cleaning device's one end and filter equipment connect, front cleaning device includes preceding washing water tank group, ventilation stirring device and spraying system, preceding washing water tank group is including the oil groove that goes, back potcher II and the back potcher I that set gradually, it sets up as an organic wholely to go oil groove, back potcher II and back potcher I, set up preceding baffle I between back potcher I and the back potcher II, go and set up preceding baffle II between oil groove and the back potcher II, preceding baffle I highly be higher than preceding baffle II, set up overflow launder II on the outer wall of deoiling groove, preceding baffle II highly be higher than overflow launder II back potcher I's top sets up the inlet tube.

10. A method for treating an environmental protection treatment device for zero discharge of waste water for QPQ process production according to any one of the above claims, which is characterized in that: the sewage treatment device comprises a rear cleaning device, a filtering device and a waste water evaporation device, wherein one end of the rear cleaning device is connected with the filtering device, the other end of the rear cleaning device is connected with the waste water evaporation device, the filtering device filters water and then is used by the rear cleaning device, and sewage after the use of the rear cleaning device is subjected to evaporation treatment through the waste water evaporation device.