A liquid seal ring cooler sewage zero discharge system and control method thereof

Abstract

The present invention provides a liquid-sealed annular cooler sewage zero-discharge system and a control method thereof, comprising a rainwater collection device and a sewage treatment device arranged on the ground, wherein the rainwater collection device comprises a rainwater collection pit, a rainwater drainage ditch and a rainwater collection pump; the sewage treatment device comprises a water distribution tank, a sedimentation tank and a return water tank; wherein the water distribution tank is connected to the sedimentation tank through a water distribution hole, a sedimentation tank sludge pump is arranged in the sedimentation tank, a recycling water pump is arranged in the return water tank, the muddy sewage in the liquid-sealed water tank flows into the water distribution tank by gravity through a sludge discharge pipe, the muddy sewage in the sedimentation tank is pumped to a low-quality water tank through a conveying pipe by the sedimentation tank sludge discharge pump, the initial rainwater collected in the rainwater collection pit enters the water distribution tank through a rainwater return pipe, and the clarified water in the return water tank is pumped to the liquid-sealed water tank through a sludge discharge water supply pipe by the recycling water pump. The present invention can achieve zero discharge of sewage from the liquid-sealed annular cooler, without the need to add a large amount of new water, thereby saving water resources.

Description

Technical Field

[0001] The invention relates to the technical field of steel smelting, and in particular to a liquid-sealed ring cooler sewage zero-discharge system and a control method thereof. Background Art

[0002] In steel smelting, the ring cooler is used to cool the sintered materials. The ring cooler is in the shape of a ring as a whole. The sintered materials run through the ring cooler trolley for one cycle to complete cooling and unloading. During the material cooling process, a large amount of hot flue gas will be directly discharged into the atmosphere, which not only causes air pollution but also wastes energy. In response to these problems, the liquid-sealed ring cooler is currently the most widely used and effective one. It can significantly improve the cooling effect of the ring cooler, reduce the load of the ring cooler blower, reduce the heat loss of hot flue gas, improve the utilization efficiency of the waste heat of the ring cooler, reduce the dust leakage of the ring cooler, and protect the surrounding environment of the ring cooler.

[0003] However, the traditional liquid-sealed annular cooler is only flushed and mud-drained during maintenance. When the mud-draining valve is opened, a large amount of sewage is instantly discharged through the pipe to the rainwater ditch, and is directly discharged into the rainwater pipe without treatment, thus affecting the surrounding environment. At the same time, there is a lot of dust on the ground in the annular cooler pool area, and the initial rainwater is directly discharged through the rainwater ditch, which is easy to cause pipe ditch blockage and surrounding environmental pollution. In addition, the mud and initial rainwater in the water tank of the liquid-sealed annular cooler contain a large amount of mineral powder, which is directly discharged without recycling, causing certain economic losses. For the schematic diagram of the existing annular cooler sewage discharge, please refer to Figure 1 .

[0004] In view of this, it is necessary to propose a liquid-sealed annular cooler wastewater zero discharge system and a control method thereof to solve or at least alleviate the above-mentioned defects. Summary of the invention

[0005] The main purpose of the present invention is to provide a liquid-sealed annular cooler wastewater zero-discharge system and a control method thereof, so as to solve the problem that the muddy wastewater of the existing liquid-sealed annular cooler and the rainwater in the inner ring of the annular cooler are not recycled and directly discharged to pollute the environment.

[0006] To achieve the above-mentioned purpose, the present invention provides a liquid-sealed annular cooler sewage zero-discharge system, comprising a rainwater collection device and a sewage treatment device arranged on the ground; wherein,

[0007] The rainwater collection device comprises a rainwater collection pit for storing rainwater, a rainwater drainage ditch connected to the rainwater collection pit and arranged around the annular cooler, a rainwater return pipe arranged between the sewage treatment device and the rainwater drainage ditch, and a rainwater collection pump arranged in the rainwater collection pit; wherein the rainwater in the rainwater collection pit is pumped to the sewage treatment device along the rainwater return pipe by the rainwater collection pump;

[0008] The sewage treatment device is arranged horizontally lower than the liquid-sealed water tank of the annular cooler, and comprises a water distribution tank, a sedimentation tank, and a return water tank for connecting and storing clarified water treated by the sedimentation tank; wherein a plurality of water distribution holes are provided at the bottom of the water distribution tank, the water distribution tank is connected to the sedimentation tank through the water distribution holes, a sedimentation tank sludge pump is arranged in the sedimentation tank, and a recycled water pump is arranged in the return water tank;

[0009] Among them, the muddy sewage in the liquid-sealed water tank flows into the water distribution tank by gravity through the mud discharge pipe, and the muddy sewage in the sedimentation tank is pumped to the low-quality water pool through the sedimentation tank mud discharge pump via the delivery pipe; the initial rainwater collected in the rainwater collection pit enters the water distribution tank through the rainwater return pipe, and the clarified water in the return water tank is pumped to the liquid-sealed water tank through the mud discharge water supply pipe by the reuse water pump, and the return water tank is also connected to the external new water production network through the return water tank supply pipe.

[0010] Preferably, it also includes an electronic control device, a flow control component electrically connected to the electronic control device, a liquid level monitoring component, a mud level monitoring component and a turbidity monitoring component; wherein,

[0011] The flow control assembly includes a first electrically controlled valve installed on the rainwater return pipe, a second electrically controlled valve installed on the mud discharge pipe, a third electrically controlled valve installed on the return tank water supply pipe, and a fourth electrically controlled valve installed on the mud discharge water supply pipe; wherein the first electrically controlled valve, the second electrically controlled valve, the third electrically controlled valve and the fourth electrically controlled valve are all electrically connected to the electronic control device;

[0012] The liquid level monitoring assembly comprises a first liquid level sensor disposed in the rainwater collection pit, a second liquid level sensor disposed in the return water tank, and a third liquid level sensor disposed in the liquid-tight water tank; wherein the first liquid level sensor, the second liquid level sensor, and the third liquid level sensor are all electrically connected to the electronic control device;

[0013] The mud level monitoring component includes a mud level meter disposed in the sedimentation tank; the turbidity monitoring component includes a turbidity meter disposed in the liquid-sealed water tank; wherein the mud level meter and the turbidity meter are both electrically connected to the electronic control device.

[0014] Preferably, the sewage treatment device further comprises an overflow weir plate with a preset height disposed between the return water tank and the sedimentation tank to control the overflow height of the clarified water treated in the sedimentation tank to overflow into the return water tank.

[0015] Preferably, the rainwater collection device also includes a water pipe for a mixer connected to the rainwater return pipe, and the water pipe for the mixer is equipped with a fifth electrically-controlled valve, which is electrically connected to the electronic control device to transport surplus rainwater in the rainwater collection pit to the water tank for the mixer.

[0016] Preferably, a grille is provided on one side of the rainwater drainage ditch close to the rainwater collection pit, and a mounting channel steel matching the grille is pre-buried in the rainwater drainage ditch, and the length of the mounting channel steel is greater than the depth of the rainwater drainage ditch.

[0017] Preferably, a vent pipe connecting the rainwater drainage ditch and the sedimentation tank is provided at the bottom of the sedimentation tank, and the vent pipe is installed with a sixth electrically controlled valve, and the sixth electrically controlled valve is electrically connected to the electronic control device. An overflow pipe connecting the rainwater drainage ditch and the return water tank is also provided at the top of the return water tank.

[0018] Preferably, the rainwater drainage ditch has a drainage slope toward the rainwater collection pit.

[0019] Preferably, the plurality of water distribution holes are evenly arranged along the width direction of the water distribution tank.

[0020] The present invention also provides a control method for a liquid-sealed annular cooler wastewater zero-discharge system, which is applied to the liquid-sealed annular cooler wastewater zero-discharge system as described above, and comprises the steps of:

[0021] S1, when the liquid level value of the rainwater collection pit is greater than a first preset value, the liquid level value of the return water tank is less than a second preset value, and the liquid level value is greater than or equal to a third preset value, start the rainwater collection pump to allow the initial rainwater in the rainwater collection pit to flow into the sewage treatment device;

[0022] S2, when the turbidity value of the liquid-sealed water tank is greater than a preset turbidity value, transporting the muddy sewage in the liquid-sealed water tank to the water distribution tank;

[0023] S3, start the recycling water pump to transport the clarified water from the recycling pool to the liquid-sealed water tank to replenish the water taken away by the liquid-sealed water tank during sludge discharge;

[0024] S4, when the mud level in the sedimentation tank is greater than a preset height, the sedimentation tank mud pump is started to transport the muddy wastewater in the sedimentation tank to the low-quality water pool.

[0025] Preferably, the method further comprises the steps of:

[0026] S5, when the liquid level value of the rainwater collection pit is greater than the first preset value and the liquid level value of the return water tank is greater than or equal to the second preset value, start the rainwater collection pump and transport the surplus rainwater in the rainwater collection pit to the mixer water tank.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] 1. By setting up the electronic control device, flow control components, liquid level monitoring components, mud level monitoring components and turbidity monitoring components, intelligent control can be achieved without human intervention, thus reducing labor costs;

[0029] 2. By collecting rainwater near the ring cooler and recycling it, it can be recycled after treatment, without the need to add a large amount of new water instantly, which will not cause impact on the factory pool production water supply network and will not affect the normal water use of other users;

[0030] 3. Realize rainwater utilization, save water resources, and reduce new water consumption for sintering. The initial rainwater collection and treatment can effectively improve the surrounding environment of the ring cooler. The surplus rainwater is used as water for the mixer adding equipment, effectively reducing the new water consumption for sintering and saving water resources.

[0031] 4. The sludge discharged from the water tank of the liquid-sealed annular cooler and the initial rainwater contain a large amount of mineral powder. After being treated by the sewage treatment device, the pressurized mud water in the sludge tank can be used for pumping water from the annular cooler trolley to recover the mineral powder in the wastewater, which has certain economic benefits. While achieving zero sewage discharge of the liquid-sealed annular cooler, it also saves water resources and turns waste into treasure. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0033] Figure 1 It is a schematic diagram of the structure of the wastewater discharge of the ring cooler in the prior art;

[0034] Figure 2 It is a schematic plan view of the overall structure in one embodiment of the present invention;

[0035] Figure 3 A schematic diagram of a control scheme flow chart in one embodiment of the present invention;

[0036] Figure 4 for Figure 2 A schematic diagram of the cross-sectional structure along the 1-1 direction;

[0037] Figure 5 for Figure 2 A schematic diagram of the cross-sectional structure along the 2-2 direction;

[0038] Figure 6 for Figure 2 A schematic diagram of the cross-sectional structure along the 3-3 direction;

[0039] Figure 7 for Figure 2 A schematic diagram of the cross-sectional structure along the 4-4 direction;

[0040] Figure 8 This is an application scenario diagram of a grid in one embodiment of the present invention;

[0041] Fig. 9 Schematic diagram of the structure of a grille in one embodiment of the present invention.

[0042] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings in conjunction with the embodiments.

[0043] Description of Figure Numbers:

[0044] 10. Liquid-sealed annular cooler; 110. Mud discharge valve; 120. Rainwater ditch; 130. Liquid-sealed water tank; 20. Rainwater collection device; 210. Rainwater collection pit; 220. Rainwater drainage ditch; 230. Rainwater return pipe; 240. Rainwater collection pump; 250. Grille; 260. Installation channel steel; 30. Sewage treatment device; 310. Water distribution tank; 311. Water distribution hole; 320. Sedimentation tank; 330. Return water tank; 340. Overflow weir plate; 350. Sedimentation tank mud discharge pump; 360. Recycling water pump; 410. Mud discharge pipe; 420. Return water tank water supply pipe; 430. External production new water network; 440. Vent pipe; 450. Overflow pipe; 460. Normal water supply pipe of water tank; 470. Mud discharge water supply pipe;

[0045] 50. Flow control component; 510. First electrically controlled valve; 520. Second electrically controlled valve; 530. Third electrically controlled valve; 540. Fourth electrically controlled valve; 550. Fifth electrically controlled valve; 560. Sixth electrically controlled valve; 570. Seventh electrically controlled valve; 60. Liquid level monitoring component; 610. First liquid level sensor; 620. Second liquid level sensor; 630. Third liquid level sensor; 70. Mud level monitoring component; 710. Mud level meter; 80. Turbidity monitoring component; 810. Turbidimeter. DETAILED DESCRIPTION

[0046] It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention.

[0047] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0048] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0049] In addition, the descriptions of "first", "second", etc. in the present invention are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0050] Please see attached Figure 2-9 In one embodiment of the present invention, a liquid-sealed annular cooler sewage zero-discharge system includes a rainwater collection device 20 and a sewage treatment device 30 disposed on the ground; wherein,

[0051] The rainwater collection device 20 includes a rainwater collection pit 210 for storing rainwater, a rainwater drainage ditch 220 connected to the rainwater collection pit 210 and arranged around the annular cooler, a rainwater return pipe 230 arranged between the sewage treatment device 30 and the rainwater drainage ditch 220, and a rainwater collection pump 240 arranged in the rainwater collection pit 210; wherein the rainwater in the rainwater collection pit 210 is pumped to the sewage treatment device 30 along the rainwater return pipe 230 by the rainwater collection pump 240. It should be noted that the number of the rainwater collection pumps 240 can be selected according to actual parameters such as the capacity of the actual rainwater collection pit 210.

[0052] The sewage treatment device 30 is arranged horizontally lower than the liquid-sealed water tank 130 of the annular cooler, and includes a water distribution tank 310, a sedimentation tank 320, and a return water tank 330 for connecting and storing clarified water treated by the sedimentation tank 320; wherein, a plurality of water distribution holes 311 are opened at the bottom of the water distribution tank 310, and the water distribution tank 310 is connected to the sedimentation tank 320 through the water distribution holes 311, a sedimentation tank 320 sludge pump is arranged in the sedimentation tank 320, and a recycled water pump 360 is arranged in the return water tank 330. It should be noted that, compared with the existing method of directly discharging the sewage from the liquid-sealed water tank 130 into the rainwater ditch 120, in the present application, the liquid-sealed water tank 130 of the annular cooler is arranged higher than the sewage treatment device 30, and the height difference is utilized to allow the muddy sewage in the liquid-sealed water tank 130 to flow into the sewage treatment device 30 through the mud discharge pipe 410 by gravity, and then the muddy sewage is subjected to centralized sedimentation treatment, and the mineral powder in the muddy sewage is recycled and utilized, thereby improving economic benefits.

[0053] Among them, the muddy sewage in the liquid-sealed water tank 130 flows into the water distribution tank 310 by gravity through the mud discharge pipe 410, and the muddy sewage in the sedimentation tank 320 is pumped to the low-quality water pool (not shown) through the mud discharge pump of the sedimentation tank 320 via the delivery pipe; the initial rainwater collected by the rainwater collection pit 210 enters the water distribution tank 310 through the rainwater return pipe 230, and the clarified water in the return water tank 330 is pumped to the liquid-sealed water tank 130 through the mud discharge replenishment pipe 470 by the reuse water pump 360, and the return water tank 330 is also connected to the external new water production network 430 through the return water tank replenishment pipe 420.

[0054] Specifically, the sewage treatment device 30 is an above-ground structure, and the sewage treatment device 30 specifically includes a water distribution tank 310, a sedimentation tank 320, and a return water tank 330 which are connected in sequence. The water distribution tank 310 is connected to the sedimentation tank 320 through the water distribution hole 311, and the clarified water treated in the sedimentation tank 320 can overflow into the return water tank 330, so that the muddy sewage from the rainwater collection pit 210 or the liquid-sealed water tank 130 can be transported to the sedimentation tank 320 through the water distribution hole 311, and the initial rainwater or muddy sewage collected in the sedimentation tank 320 is subjected to the sedimentation degradation and other effects of the sedimentation tank 320, and the treated clarified water overflows into the return water tank 330, and then, the clarified water in the return water tank 330 can be used as the replenishment water of the water volume brought out when the liquid-sealed water tank 130 is discharged, without directly using the externally produced new water for replenishment, so as to achieve the purpose of recycling the initial rainwater near the annular cooler. Under normal circumstances, the liquid-sealed water tank 130 is connected to the external new water production network 430 through the normal water replenishment pipe 460 of the water tank. The water replenishment of the liquid-sealed water tank 130 in the prior art all comes from the external new water production network 430. The present application starts the reuse water pump 360 in time to replenish the water brought out by the liquid-sealed water tank 130 when discharging mud, thereby realizing the recycling of the initial rainwater collected in the rainwater collection pit 210.

[0055] In addition, the initial rainwater and muddy wastewater contain a large amount of sludge, and the sludge contains a large amount of useful mineral powder. Through the sedimentation effect of the sedimentation tank 320, the mineral powder in the initial rainwater or muddy wastewater can be effectively recycled. By starting the sludge pump of the sedimentation tank 320, the sludge can be pumped to the required equipment or place. The low-quality water pool referred to in this application is suitable for equipment with low requirements for water supply quality, such as water pumping for the low-temperature section trolley of the ring cooler, water pumping for the discharge belt of the ring cooler, water addition for the mixer, and water for quicklime digestion. It is recommended to give priority to pumping water for the ring cooler trolley because the sludge delivery pipeline is short and not easy to clog. In this way, the mineral powder in the initial rainwater and the muddy sewage in the liquid-sealed water tank 130 is effectively recycled, thereby improving the economic benefits.

[0056] The number and arrangement of the water distribution holes 311 can be set according to actual needs. For example, in a specific example, multiple water distribution holes 311 can be arranged in a uniform manner to achieve uniform water distribution. Similarly, the number of mud pumps in the sedimentation tank 320 can also be set according to actual needs. For example, in a specific embodiment, the number of mud pumps is set to two.

[0057] Further, in a preferred embodiment, the design parameters of the sewage treatment device 30 are: the hydraulic retention time of the sedimentation tank 320 is 1.0 to 1.5 hours, the volume of the sedimentation tank 320 is checked to be no less than the sum of the water storage volume of the liquid-sealed water tank 130 and the initial rainwater volume of the rainwater collection pit 210, and the initial rainwater volume is considered to be 5 mm to 8 mm in initial runoff thickness. It is understandable that in other embodiments, those skilled in the art can also make settings according to actual needs.

[0058] As a preferred embodiment, it also includes an electric control device (not shown), a flow control component 50 electrically connected to the electric control device, a liquid level monitoring component 60, a mud level monitoring component 70 and a turbidity monitoring component 80; wherein,

[0059] The flow control assembly 50 includes a first electrically controlled valve 510 installed on the rainwater return pipe 230, a second electrically controlled valve 520 installed on the mud discharge pipe 410, a third electrically controlled valve 530 installed on the return pool water supply pipe 420, and a fourth electrically controlled valve 540 installed on the mud discharge water supply pipe 470; wherein the first electrically controlled valve 510, the second electrically controlled valve 520, the third electrically controlled valve 530, and the fourth electrically controlled valve 540 are all electrically connected to the electronic control device;

[0060] The liquid level monitoring assembly 60 includes a first liquid level sensor 610 disposed in the rainwater collection pit 210, a second liquid level sensor 620 disposed in the return water tank 330, and a third liquid level sensor 630 disposed in the liquid-tight water tank 130; wherein the first liquid level sensor 610, the second liquid level sensor 620, and the third liquid level sensor 630 are all electrically connected to the electronic control device;

[0061] The mud level monitoring assembly 70 includes a mud level meter 710 disposed in the sedimentation tank 320; the turbidity monitoring assembly 80 includes a turbidity meter 810 disposed in the liquid-sealed water tank 130; wherein the mud level meter 710 and the turbidity meter 810 are both electrically connected to the electronic control device.

[0062] It should be understood by those skilled in the art that in order to realize the unmanned operation of the sewage zero discharge system of the liquid-sealed ring cooler 10 and reduce labor costs, in this embodiment, an electric control device, a flow control component 50, a liquid level monitoring component 60, a mud level monitoring component 70 and a turbidity monitoring component 80 are introduced. The electric control device can be, but is not limited to, a PLC control system commonly used in sintering plants. The specific workflow is as follows:

[0063] 1. Realize the intelligent rainwater treatment of the liquid-sealed water tank 130. By obtaining the first liquid level value detected by the first liquid level sensor 610 and judging whether the first liquid level value is greater than the first preset value, when the first liquid level value is greater than the first preset value, obtain the second liquid level value detected by the second liquid level sensor 620. That is to say, when there is enough water in the rainwater collection pit 210, the water level of the return pool 330 is obtained. When the second liquid level value is less than the second preset value and the second liquid level value is greater than or equal to the third preset value, the first electric control valve 510 and the rainwater collection pump 240 are controlled to open, so that the initial rainwater in the rainwater collection pit 210 flows into the sewage treatment device 30, and the treated initial rainwater is used to replenish the liquid-sealed water tank 130. When the first liquid level value is lower than the lower limit, the rainwater collection pump 240 is controlled to be closed to avoid the rainwater collection pump 240 from being vacuumed.

[0064] 2. Realize intelligent sludge discharge. By obtaining the turbidity value detected by the turbidity meter 810 and judging whether the turbidity value is greater than the preset turbidity value, when the turbidity value is greater than the preset turbidity value, control the second electric control valve 520 to open so that the muddy sewage in the liquid-sealed water tank 130 flows into the water distribution tank 310; and control the recycling water pump 360 and the fourth electric control valve 540 to open to supplement the water taken away by the liquid-sealed water tank 130 when discharging sludge.

[0065] When the mud level value is less than or equal to the preset mud level value, the second electric control valve 520, the return water pump and the fourth electric control valve 540 are controlled to be closed. In other words, when the turbidity of the water in the liquid-sealed water tank 130 is higher than the preset turbidity value, the second electric control valve 520 is controlled to open to start draining the muddy sewage in the liquid-sealed water tank 130, and the return water pump 360 and the fourth electric control valve 540 are controlled to open, so as to timely replenish the amount of water taken away by the liquid-sealed water tank 130 when draining mud, and maintain the height of the sealed water level in the liquid-sealed water tank 130. And when the turbidity in the liquid-sealed water tank 130 is less than or equal to the preset turbidity value, that is, at a normal level, the second electric control valve 520 is controlled to be closed, and the return water pump 360 and the fourth electric control valve 540 are controlled to be closed, so that the automatic mud discharge and rapid water replenishment process of the liquid-sealed water tank 130 can be realized.

[0066] 3. Realize intelligent water replenishment of the liquid-sealed water tank 130. By setting the third liquid level sensor 630 in the liquid-sealed water tank 130, the seventh electric control valve 570 installed on the normal water replenishment pipe 460 of the water tank is interlocked with the signal of the third liquid level sensor 630 to automatically control the liquid level of the liquid-sealed water tank 130. When the water level of the liquid-sealed water tank 130 reaches the upper limit, the seventh electric control valve 570 is controlled to close and stop replenishing water to the liquid-sealed water tank 130. On the contrary, when the water level in the liquid-sealed water tank 130 reaches the lower limit, the seventh electric control valve 570 is controlled to open to realize automatic normal water replenishment to the liquid-sealed water tank 130.

[0067] 4. Realize intelligent water replenishment of the return water tank 330. By setting a second liquid level sensor 620 in the return water tank 330, when the liquid level in the return water tank 330 drops to the low limit, the third electric control valve 530 is controlled to open, and the new water from the external production new water network 430 enters the return water tank 330. When the liquid level in the return water tank 330 rises to the middle liquid level, the third electric control valve 530 is closed and the water replenishment is stopped. The space from the middle liquid level to the high limit is reserved for processing and storing the initial rainwater.

[0068] As a preferred embodiment, the sewage treatment device 30 further includes an overflow weir plate 340 with a preset height disposed between the return water tank 330 and the sedimentation tank 320 to control the overflow height of the clarified water treated by the sedimentation tank 320 to overflow into the return water tank 330. It should be noted that the overflow weir plate 340 with a preset height disposed between the return water tank 330 and the sedimentation tank 320 in the present application can control the water level height of the clarified water treated by the sedimentation tank 320 overflowing into the return water tank 330. Similarly, the water in the return water tank 330 will also flow into the sedimentation tank 320 when it exceeds the overflow weir height. Since the sediment in the sedimentation tank 320 is deposited at the bottom, the water quality in the upper part of the sedimentation tank 320 can meet the water quality requirements of the return water tank 330.

[0069] Furthermore, the rainwater collection device 20 also includes a mixer water pipe connected to the rainwater return pipe 230, and the mixer water pipe is installed with a fifth electric control valve 550, and the fifth electric control valve 550 is electrically connected to the electric control device to transport the surplus rainwater in the rainwater collection pit 210 to the mixer water pool. Specifically, when the second liquid level value is greater than or equal to the second preset value, it means that the liquid level of the return water pool 330 is already at a high liquid level. At this time, the first electric control valve 510 is controlled to be closed, and the fifth electric control valve 550 is controlled to be opened, so that the surplus rainwater in the rainwater collection pit 210 flows into the mixer water pool, so that the surplus rainwater flows into the mixer water pool, thereby achieving the classification and comprehensive utilization of rainwater.

[0070] Furthermore, a grille 250 is provided on one side of the rainwater drainage ditch 220 close to the rainwater collection pit 210 , and an installation channel steel 260 matching the grille 250 is pre-buried in the rainwater drainage ditch 220 , and the length of the installation channel steel 260 is greater than the depth of the rainwater drainage ditch 220 .

[0071] As a preferred embodiment, a vent pipe 440 connecting the rainwater drainage ditch 220 and the sedimentation tank 320 is provided at the bottom of the sedimentation tank 320, and a sixth electric-controlled valve 560 is installed on the vent pipe 440, and the sixth electric-controlled valve 560 is electrically connected to the electric control device, and an overflow pipe 450 connecting the rainwater drainage ditch 220 and the return water tank 330 is also provided on the top of the return water tank 330. By providing the vent pipe 440, when the sedimentation tank 320 needs to be emptied, it is only necessary to control the fifth electric-controlled valve 550 to be opened to empty the sedimentation tank 320, and during use, the fifth electric-controlled valve 550 can be closed.

[0072] Further, the rainwater drainage ditch 220 has a drainage slope toward the rainwater collection pit 210. It is understood that by providing the rainwater drainage ditch 220 with a drainage slope toward the rainwater collection pit 210, it is convenient to collect rainwater around the annular cooler. It is understood that the specific value of the drainage slope can be set according to actual needs.

[0073] The present invention also provides a control method for a liquid-sealed annular cooler wastewater zero-discharge system, which is applied to the liquid-sealed annular cooler wastewater zero-discharge system as described above, and comprises the steps of:

[0074] S1, when the liquid level value of the rainwater collection pit 210 is greater than a first preset value, the liquid level value of the return water tank 330 is less than a second preset value, and the liquid level value is greater than or equal to a third preset value, start the rainwater collection pump 240 to allow the initial rainwater in the rainwater collection pit 210 to flow into the sewage treatment device 30;

[0075] S2, when the turbidity value of the liquid-sealed water tank 130 is greater than a preset turbidity value, the muddy sewage in the liquid-sealed water tank 130 is transported to the water distribution tank 310;

[0076] S3, start the recycling water pump 360 to transport the clarified water from the recycling pool 330 to the liquid-sealed water tank 130 to replenish the water taken away by the liquid-sealed water tank 130 when discharging mud;

[0077] S4, when the mud level in the sedimentation tank 320 is greater than a preset height, the mud discharge pump in the sedimentation tank 320 is started to transport the muddy wastewater in the sedimentation tank 320 to the low-quality water pool.

[0078] Preferably, the method further comprises the steps of:

[0079] S5, when the liquid level value of the rainwater collection pit 210 is greater than the first preset value and the liquid level value of the return water tank 330 is greater than or equal to the second preset value, the rainwater collection pump 240 is started to transport the surplus rainwater in the rainwater collection pit 210 to the mixer water tank. In this way, the surplus rainwater flows into the mixer water tank, thereby achieving classified and comprehensive utilization of rainwater.

[0080] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A liquid-sealed annular cooler wastewater zero discharge system, characterized in that: It includes a rainwater collection device and a sewage treatment device arranged on the ground; wherein, The rainwater collection device comprises a rainwater collection pit for storing rainwater, a rainwater drainage ditch connected to the rainwater collection pit and arranged around the annular cooler, a rainwater return pipe arranged between the sewage treatment device and the rainwater drainage ditch, and a rainwater collection pump arranged in the rainwater collection pit; wherein the rainwater in the rainwater collection pit is pumped to the sewage treatment device along the rainwater return pipe by the rainwater collection pump; The sewage treatment device is arranged horizontally lower than the liquid-sealed water tank of the annular cooler, and comprises a water distribution tank, a sedimentation tank, and a return water tank for connecting and storing clarified water treated by the sedimentation tank; wherein a plurality of water distribution holes are provided at the bottom of the water distribution tank, the water distribution tank is connected to the sedimentation tank through the water distribution holes, a sedimentation tank sludge pump is arranged in the sedimentation tank, and a recycled water pump is arranged in the return water tank; Among them, the muddy sewage in the liquid-sealed water tank flows into the water distribution tank by gravity through the mud discharge pipe, and the muddy sewage in the sedimentation tank is pumped to the low-quality water pool through the sedimentation tank mud discharge pump via the delivery pipe; the initial rainwater collected in the rainwater collection pit enters the water distribution tank through the rainwater return pipe, and the clarified water in the return water tank is pumped to the liquid-sealed water tank through the mud discharge water supply pipe by the reuse water pump, and the return water tank is also connected to the external new water production network through the return water tank supply pipe.

2. The liquid-sealed annular cooler wastewater zero discharge system according to claim 1 is characterized in that: It also includes an electronic control device, a flow control component electrically connected to the electronic control device, a liquid level monitoring component, a mud level monitoring component and a turbidity monitoring component; wherein, The flow control assembly includes a first electrically controlled valve installed on the rainwater return pipe, a second electrically controlled valve installed on the mud discharge pipe, a third electrically controlled valve installed on the return tank water supply pipe, and a fourth electrically controlled valve installed on the mud discharge water supply pipe; wherein the first electrically controlled valve, the second electrically controlled valve, the third electrically controlled valve and the fourth electrically controlled valve are all electrically connected to the electronic control device; The liquid level monitoring assembly comprises a first liquid level sensor disposed in the rainwater collection pit, a second liquid level sensor disposed in the return water tank, and a third liquid level sensor disposed in the liquid-tight water tank; wherein the first liquid level sensor, the second liquid level sensor, and the third liquid level sensor are all electrically connected to the electronic control device; The mud level monitoring component includes a mud level meter disposed in the sedimentation tank; the turbidity monitoring component includes a turbidity meter disposed in the liquid-sealed water tank; wherein the mud level meter and the turbidity meter are both electrically connected to the electronic control device.

3. The liquid-sealed annular cooler wastewater zero discharge system according to claim 2 is characterized in that: The sewage treatment device further comprises an overflow weir plate with a preset height disposed between the return water tank and the sedimentation tank to control the overflow height of the clarified water treated in the sedimentation tank to overflow into the return water tank.

4. The liquid-sealed annular cooler wastewater zero discharge system according to claim 3 is characterized in that: The rainwater collection device also includes a mixer water pipe connected to the rainwater return pipe, and the mixer water pipe is installed with a fifth electric control valve. The fifth electric control valve is electrically connected to the electric control device to transport the surplus rainwater in the rainwater collection pit to the mixer water pool.

5. The liquid-sealed annular cooler wastewater zero discharge system according to claim 4 is characterized in that: A grille is arranged on one side of the rainwater drainage ditch close to the rainwater collection pit, and a mounting channel steel matching with the grille is pre-buried in the rainwater drainage ditch, and the length of the mounting channel steel is greater than the depth of the rainwater drainage ditch.

6. The liquid-sealed annular cooler wastewater zero discharge system according to claim 5 is characterized in that: A vent pipe connecting the rainwater drainage ditch and the sedimentation tank is arranged at the bottom of the sedimentation tank, and the vent pipe is installed with a sixth electrically controlled valve, and the sixth electrically controlled valve is electrically connected to the electronic control device. An overflow pipe connecting the rainwater drainage ditch and the return water tank is also arranged at the top of the return water tank.

7. The liquid-sealed annular cooler wastewater zero discharge system according to claim 1 is characterized in that: The rainwater drainage ditch has a drainage slope toward the rainwater collection pit.

8. The liquid-sealed annular cooler wastewater zero discharge system according to any one of claims 1 to 7, characterized in that: The plurality of water distribution holes are evenly arranged along the width direction of the water distribution tank.

9. A control method for a liquid-sealed ring cooler wastewater zero discharge system, characterized in that: The liquid-sealed annular cooler wastewater zero discharge system as claimed in any one of claims 1 to 8 comprises the following steps: S1, when the liquid level value of the rainwater collection pit is greater than a first preset value, the liquid level value of the return water tank is less than a second preset value, and the liquid level value is greater than or equal to a third preset value, start the rainwater collection pump to allow the initial rainwater in the rainwater collection pit to flow into the sewage treatment device; S2, when the turbidity value of the liquid-sealed water tank is greater than a preset turbidity value, transporting the muddy sewage in the liquid-sealed water tank to the water distribution tank; S3, start the recycling water pump to transport the clarified water from the recycling pool to the liquid-sealed water tank to replenish the water taken away by the liquid-sealed water tank during sludge discharge; S4, when the mud level in the sedimentation tank is greater than a preset height, the sedimentation tank mud pump is started to transport the muddy wastewater in the sedimentation tank to the low-quality water pool.

10. The control method of the liquid-sealed annular cooler wastewater zero-discharge system according to claim 9, characterized in that: Also includes the steps: S5, when the liquid level value of the rainwater collection pit is greater than the first preset value and the liquid level value of the return water tank is greater than or equal to the second preset value, start the rainwater collection pump and transport the surplus rainwater in the rainwater collection pit to the mixer water tank.

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