Thick plate heat treatment line quenching water treatment system

Abstract

The embodiment of the invention provides a thick plate heat treatment line quenching water treatment system, and relates to the field of water treatment.The thick plate heat treatment line quenching water treatment system comprises a quenching machine and an iron sheet ditch used for collecting a high-pressure water system and a low-pressure water system from the quenching machine, and an outlet of the iron sheet ditch is connected with an adjusting sedimentation tank; the adjusting settling pond is sequentially connected with a filter, a cooling tower and a cooling pond in series through a pipeline, and the adjusting settling pond is further directly communicated with the cooling pond through a bypass lifting pipeline; the cooling pond is connected with a low-pressure water system of the quenching machine through a low-pressure water supply pipeline, and the cooling pond is connected with a high-pressure water system of the quenching machine through a high-pressure water supply pipeline. According to the invention, the quenching circulating water of the thick plate heat treatment line is treated by adopting a short-flow process, the regulating sedimentation tank integrating regulating and sedimentation functions is mainly adopted, the flow is shorter, the occupied area is reduced, the space is saved, the arrangement of a lifting pump set is reduced, the one-time investment of equipment, facilities and the like is reduced, and the operating cost is reduced.

Description

Technical Field

[0001] The invention relates to the field of water treatment, and in particular to a quenching water treatment system for a thick plate heat treatment line. Background Art

[0002] In the quenching water treatment process of the thick plate heat treatment line, the water discharged from the quenching machine is removed from the iron groove, cooled, and then lifted to the high-level water tower by the high-level water tower water supply pump. The water discharged from the high-level water tower is then returned to the quenching machine for recycling. This process has the following problems:

[0003] 1) The construction of high-level water towers is difficult and requires high investment.

[0004] 2) The lifting pump group is used for lifting, filtering and cooling design without considering the characteristics of the quenching process. The water supply pump group is always open during the quenching interval. At this time, no steel plate passes through. This part of the water does not need to be cooled because there is no heat exchange, resulting in increased investment and operating costs of the lifting and cooling tower systems.

[0005] 3) A high-level water tower is used to regulate water volume and water pressure. Due to the large volume of the high-level water tower and the difference between the highest and lowest liquid levels of 8-10m, the head of the pump set for the high-level water tower is designed according to the highest water pressure. The increase of the water pump head causes the increase of the water pump selection head and the power to increase, which increases the investment and operation cost of the high-level water tower pump set.

[0006] 4) The water from the high-level water tower supplies water to the suction pipes of the low-pressure section and the high-pressure section booster pump at the same time. The water distribution is difficult to balance and the water pressure is unstable, which affects the quenching effect of the steel plate.

[0007] 5) Due to the large amount of water stored in the high-level water tower, the height difference between the highest and lowest liquid levels exceeds 5m, which leads to a large fluctuation range of water pressure before and after quenching of the same steel plate, affecting the quenching effect of the steel plate.

[0008] In view of this, this application is hereby filed. Summary of the invention

[0009] The objects of the present invention include, for example, providing a quenching water treatment system for a thick plate heat treatment line, which can reduce the energy consumption of equipment operation, reduce costs, and provide a stable water pressure for the quenching machine.

[0010] The embodiments of the present invention can be implemented as follows:

[0011] In a first aspect, the present invention provides a quenching water treatment system for a thick plate heat treatment line, comprising a quenching machine and a sheet metal ditch for collecting a high-pressure water system and a low-pressure water system from the quenching machine, wherein the outlet of the sheet metal ditch is connected to a regulating sedimentation tank, wherein the regulating sedimentation tank is sequentially connected in series with a filter, a cooling tower and a cooling tank through a pipeline, and the regulating sedimentation tank is also directly connected to the cooling tank through a bypass lifting pipeline;

[0012] The cooling pool is connected to the low-pressure water system of the quenching machine through a low-pressure water supply pipeline, and the cooling water pool is connected to the high-pressure water system of the quenching machine through a high-pressure water supply pipeline.

[0013] In an optional embodiment, the low-pressure water supply pipeline is provided with a low-pressure filter, and the high-pressure water supply pipeline is provided with a high-pressure filter.

[0014] In an optional embodiment, one end of the regulating sedimentation tank is a water inlet end and the other end is a water outlet end. The regulating sedimentation tank is provided with a water distribution area, a slag grabbing area and a regulating sedimentation area in sequence from the water inlet end to the water outlet end, and a slag grabbing bucket is provided above the slag grabbing area.

[0015] In an optional embodiment, the length-to-width ratio of the regulating sedimentation tank is greater than or equal to 4:1, the ratio of length to effective water depth is ≥8:1, and the residence time of water in the regulating sedimentation tank is greater than 30 minutes.

[0016] In an optional embodiment, a water outlet is provided at the water outlet end of the regulating sedimentation tank, the water outlet is connected to a pump room, a hot water well is provided below the pump room, and the pump room is provided with a filter lifting pipe connected to the filter and a bypass lifting pipe connected to the cooling tank.

[0017] In an optional embodiment, the regulating and settling area includes, from bottom to top, a sedimentation area, a sedimentation area and a water volume regulating area, and the water outlet hole is arranged at the same height as the bottom surface of the water volume regulating area.

[0018] In an optional embodiment, an alarm line, a minimum water level line, a filter cooling pump start water level line, a bypass lift pump start water level line, a high water level alarm line and an accident high water level alarm line are sequentially arranged above the bottom of the hot water well;

[0019] The filter lifting pipeline is provided with a filter cooling pump group, which includes four filter cooling pumps. When the water level is lower than the alarm line, all the filter cooling pumps are turned off; when the water level is higher than the filter cooling pump start water level line, all the filter cooling pumps are turned on.

[0020] A bypass lift pump group is arranged on the bypass lift pipeline, and the bypass lift pump group includes three bypass lift pumps; when the water level is lower than the filter cooling pump start water level line, at least two of the bypass lift pumps are turned off; when the water level is between the filter cooling pump start water level line and the bypass lift pump start water level line, at least one bypass lift pump is turned off; when the water level is between the bypass lift pump start water level line and the high water level alarm line, at least two bypass lift pumps are turned on; when the water level is higher than the high water level alarm line, all of the bypass lift pumps are turned on.

[0021] In an optional embodiment, the high-pressure water supply pipeline is also connected to the iron groove through a high-pressure pressure relief pipe of a quenching machine, and the low-pressure water supply pipeline is also connected to the iron groove through a low-pressure pressure relief pipe of a quenching machine.

[0022] In an optional embodiment, it also includes a centralized control system electrically connected to the quenching machine, and the centralized control system controls the quenching machine to perform high-pressure quenching and low-pressure quenching on plates of different thicknesses according to Table 1.

[0023] Table 1

[0024]

[0025] In an optional embodiment, a liquid level transmitter is provided on the regulating sedimentation tank, a flow transmitter is provided on the filtering lifting pipeline, a liquid level transmitter and a current transformer are provided on the cooling tank, a pressure transmitter and a flow transmitter are provided on the high-pressure water supply pipeline, and a pressure transmitter and a flow transmitter are provided on the low-pressure water supply pipeline, and all of the liquid level transmitters, flow transmitters, current transformers, pressure transmitters and flow transmitters are connected to the centralized control system signal;

[0026] The high-pressure water supply pipeline is provided with a high-pressure water supply pump, and the low-pressure water supply pipeline is provided with a low-pressure water supply pump. The centralized control system is electrically connected to all high-pressure water supply pumps, low-pressure water supply pumps, bypass lift pumps and filter cooling pumps, and the control system is electrically connected to the filter, cooling tower, low-pressure filter and high-pressure water supply pipeline.

[0027] The beneficial effects of the embodiments of the present invention include, for example:

[0028] The present invention adopts a short process to treat the quenching circulating water of the thick plate heat treatment line, and mainly adopts an integrated underground regulating sedimentation tank with regulating and sedimentation functions to regulate the water volume and precipitate the return water of the quenching machine, and cancels the regulating tank, lifting pump, and sedimentation tank in the conventional process. After sedimentation, a part is lifted by the filtering cooling pump group and sent to the filter and cooling tower for filtering and cooling in turn, and then enters the cooling pool and is directly sent to the cooling pool through the bypass lifting pipeline for mixing, and then respectively sent to the low-pressure water supply system and high-pressure water supply system of the quenching machine through the low-pressure water supply pipeline and the high-pressure water supply pipeline for recycling. The integrated regulating sedimentation tank is used to replace the regulating tank, lifting pump group, and vortex pool / sedimentation tank of the conventional process, which has a shorter process, less space, and saves space. At the same time, the setting of the lifting pump group is reduced, the one-time investment in equipment and facilities is reduced, and the operating cost is reduced.

[0029] Since this part of the circulating water does not come into contact with the plate during the quenching interval, the water temperature does not rise. At this time, the water enters the sedimentation regulating tank, and the water temperature in the sedimentation regulating tank will decrease. When the water temperature in the regulating sedimentation tank is lower than the preset value, the water in the regulating sedimentation tank can be directly transferred to the cooling tank and mixed with the water cooled by the cooling tower, thereby reducing the load on subsequent filtering and cooling equipment, thereby reducing investment and reducing operating costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0031] Figure 1 This is a schematic diagram of the quenching water treatment system of the original thick plate heat treatment line;

[0032] Figure 2 This is a schematic diagram of the quenching water treatment system of the medium and thick plate heat treatment line of this application;

[0033] Figure 3 This is a schematic diagram of the plan of the regulating sedimentation tank;

[0034] Figure 4 for Figure 3 AA section view;

[0035] Figure 5 Schematic diagram of interlocking start for regulating the liquid level of the water pump in the sedimentation tank;

[0036] Figure 6 This is a schematic diagram of the centralized control system in this application.

[0037] Icons: 1-high-pressure water system; 2-low-pressure water system; 3-regulating sedimentation tank; 4-bypass lifting pipeline; 41-bypass lifting pump group; 5-filter lifting pipeline; 51-filter lifting pump group; 6-filter; 7-cooling tower; 8-cooling tank; 9-low-pressure water supply pump; 10-high-pressure water supply pump; 11-low-pressure filter; 12-high-pressure filter; 13-quenching machine low-pressure relief pipe; 14-quenching machine high-pressure relief pipe; 15-quenching furnace; 16-centralized control system; 17-underground regulating tank; 18-cyclone tank; 19-high-level water tower; 20-iron ditch;

[0038] 31-water distribution area; 32-slag grabbing area; 33-regulating sedimentation area; 34-slag grabbing bucket; 35-slag area; 36-sedimentation area; 37-water volume regulation area; 38-pump room; 39-hot water well. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0040] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. 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.

[0041] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0042] In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. appear to indicate an orientation or position relationship, they are based on the orientation or position relationship shown in the accompanying drawings, or are the orientation or position relationship in which the product of the invention is usually placed when used. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0043] In addition, the terms “first”, “second”, etc., if used, are merely used to distinguish between the descriptions and should not be understood as indicating or implying relative importance.

[0044] It should be noted that, in the absence of conflict, the features in the embodiments of the present invention may be combined with each other.

[0045] The applicant's original process Figure 1 As shown, a high-level water tower 19 is set in the quenching water treatment system of the thick plate heat treatment line. The water used by the quenching machine flows into the underground regulating tank 17 through the iron groove 20 for water volume regulation. After regulation, the water is sent to the cyclone tank 18 or the sedimentation tank for sedimentation treatment by the lifting pump pressure. The regulated and precipitated water is sent to the high-speed filter 6 and the cooling tower 7 in turn through the filter cooling pump group for filtration and cooling, and then enters the cooling tank, and is lifted by the high-level water tower 19 water supply pump and sent to the high-level water tower 19 for recycling. However, this process has the problems of high equipment cost, large pressure fluctuation, and high operating cost.

[0046] Please refer to Figure 2This embodiment provides a quenching water treatment system for a thick plate heat treatment line, comprising a quenching machine and a sheet metal ditch 20 for collecting a high-pressure water system 1 and a low-pressure water system 2 from the quenching machine, wherein the outlet of the sheet metal ditch 20 is connected to a regulating sedimentation tank 3, wherein the regulating sedimentation tank 3 is connected in series with a filter 6, a cooling tower 7 and a cooling tank 8 in sequence through a pipeline, and the regulating sedimentation tank 3 is also directly connected to the cooling tank through a bypass lifting pipeline 4;

[0047] The cooling pool is connected to the low-pressure water system 2 of the quenching machine through a low-pressure water supply pipeline, and the cooling water pool is connected to the high-pressure water system 1 of the quenching machine through a high-pressure water supply pipeline.

[0048] The present invention adopts a short process to treat the quenching circulating water of the thick plate heat treatment line, and mainly adopts an integrated underground regulating sedimentation tank 3 with regulating and sedimentation functions to regulate the water volume and sedimentation treatment of the quenching machine return water, eliminating the regulating tank, lifting pump, and sedimentation tank in the conventional process. After sedimentation, a part is lifted by the filtering cooling pump group and sent to the filter 6 and the cooling tower 7 for filtering and cooling in turn, and then sent to the cooling tank with the other part directly through the bypass lifting pipeline 4 for mixing, and then respectively sent to the quenching machine low-pressure water system 2 and high-pressure water system 1 through the low-pressure water supply pipeline and the high-pressure water supply pipeline for recycling. The integrated regulating sedimentation tank 3 is used to replace the regulating tank, lifting pump group, vortex pool 18 / sedimentation tank of the conventional process, which has a shorter process, less space, and saves space. At the same time, the setting of the lifting pump group is reduced, the one-time investment in equipment and facilities is reduced, and the operating cost is reduced.

[0049] Since this part of the circulating water does not come into contact with the plate during the quenching interval, the water temperature does not rise. The water at this time enters the sedimentation regulating tank, and the water temperature in the sedimentation regulating tank will decrease. The water in the regulating sedimentation tank 3 can be directly transferred to the cooling tank 8 and mixed with the water cooled by the cooling tower 7, thereby reducing the load on subsequent filtering and cooling equipment, thereby reducing investment and reducing operating costs.

[0050] Compared with the applicant's original solution, the present application cancels the high-level water tower 19 and adopts low-pressure water supply pipes and high-pressure water supply pipes for direct pressurized water supply, which reduces the investment in the high-level water tower 19 and avoids the water pressure fluctuation caused by the obvious drop in the water level of the high-level water tower 19 (water level difference > 5m) due to the large amount of quenching water for thick-specification quenching plates; and the low-pressure water supply pipe and the high-pressure water supply pipe operate independently without interfering with each other, avoiding water pressure fluctuations caused by sharing the water outlet of the high-level water tower 19 with the high-pressure water supply pipe, thereby affecting the quenching effect of the steel plate; in addition, since the circulating water does not need to be lifted to the high-level water tower 19 and then transferred to the quenching machine, the waste of excess water head of the secondary superposition water supply in the applicant's original process is avoided, that is: the head of the high-pressure variable frequency water supply pump group is less than the head of the water supply pump group for the high-level water tower 19 + the high-pressure water supply pump 10 group; and the power consumption is reduced. Among them, low-pressure quenching pump groups and high-pressure quenching pump groups are correspondingly arranged on the low-pressure water supply pipeline and the high-pressure water supply pipeline. The quenching water consumption can be set according to the steel plate specifications, which is conducive to the linkage control of the low-pressure quenching pump group and the high-pressure quenching pump group. Low-frequency operation during the quenching interval can not only stabilize the water supply, but also reduce energy consumption and reduce the amount of circulating water. Compared with the applicant's original technology, the quenching water treatment process of this scheme is simpler and the equipment maintenance is less. The overall investment is reduced by 20%, and the operation and maintenance costs are reduced by 30%.

[0051] Specifically, in this embodiment, the water discharged from the low-pressure water system 2 and the high-pressure water system 1 of the quenching machine is returned to the regulating sedimentation tank 3 through the iron oxide groove 20, and a part of the water discharged from the regulating sedimentation tank 3 is transferred to the filter 6, and then enters the cooling tank 8 through the cooling tower 7, and the other part directly enters the cooling tank without passing through the filter 6 and the cooling tower 7. Part of the cold water in the cooling tank enters the low-pressure water system 2 of the quenching machine through the low-pressure water supply pipe, and the other part enters the high-pressure water system 1 of the quenching machine through the high-pressure water supply pipe, so as to realize the recycling of water. Among them, according to the optimal cooling effect of the process, the pressure of the high-pressure water supply pipe can be about 1.0MPa, and the pressure of the low-pressure water supply pipe can be 0.6MPa. The combined effect of pressure and constant pressure water supply ensures the stability of quenching performance.

[0052] In an optional embodiment, a low-pressure filter 11 is provided on the low-pressure water supply pipeline, and a high-pressure filter 12 is provided on the high-pressure water supply pipeline.

[0053] Part of the quenching water is filtered through the filter 6, but part of the water enters the cooling tank before being filtered. Therefore, before the quenching machine is used, it is further filtered using a low-pressure filter 11 and a high-pressure filter 12, which may have a self-cleaning function.

[0054] In an optional embodiment, if Figure 3-4As shown, one end of the regulating sedimentation tank 3 is a water inlet end and the other end is a water outlet end. The regulating sedimentation tank 3 is sequentially provided with a water distribution area 31, a slag grabbing area 32 and a regulating sedimentation area 33 along the direction from the water inlet end to the water outlet end. A slag grabbing bucket 34 is provided above the slag grabbing area 32.

[0055] The regulating sedimentation tank 3 integrates water volume regulation and sedimentation, and adopts an underground open sedimentation tank and a hot water well 39 / pump room 38. Starting from the water inlet end, there are a water distribution area 31, a slag grabbing area 32, and a regulating sedimentation area 33. The water inlet end adopts a water distribution flower wall to evenly replenish water. A slag grabbing area 32 is set near the water inlet end, and an electric grab bucket is used to grab the slag for slag cleaning.

[0056] In an optional embodiment, the length-to-width ratio of the regulating sedimentation tank 3 is greater than or equal to 4:1, the ratio of length to effective water depth is ≥8:1, and the residence time of water in the regulating sedimentation tank 3 is greater than 30 minutes.

[0057] The iron oxide particles in the regulating sedimentation area 33 can be designed according to the sedimentation rate of 6m / h, the hydraulic retention time of the sedimentation tank is calculated as more than 30min, and the regulating volume is considered according to the most unfavorable production rhythm; the length-to-width ratio of the regulating sedimentation tank 3 is greater than or equal to 4:1, and the ratio of length to effective water depth is ≥8:1.

[0058] In an optional embodiment, a water outlet is provided at the water outlet end of the regulating sedimentation tank 3, and a pump room 38 is connected to the water outlet. A hot water well 39 is provided below the pump room 38, and a filter lifting pipe 5 connected to the filter 6 and a bypass lifting pipe 4 connected to the cooling tank are provided on the pump room 38.

[0059] Since there is no cooling when passing the steel gap and opening the nozzle in advance, a filtering lifting pipe 5 and a bypass lifting pipe 4 are respectively set, and the flow rates of the two are designed at 7:3. A part of the effluent from the sedimentation tank 3 is sent to the filter 6 through the filtering lifting pipe 5, and then transferred to the cooling tower 7. After filtering and cooling, the water enters the cooling pool; the other part is directly sent to the cooling pool through the bypass lifting pipe 4.

[0060] In an optional embodiment, the regulating and settling area 33 includes a sediment area 35 , a sedimentation area 36 and a water volume regulating area 37 from bottom to top, and the water outlet is arranged at the same height as the bottom surface of the water volume regulating area 37 .

[0061] The regulating sedimentation area 33 is divided into a sedimentation area 35, a sedimentation area 36, ​​and a water volume regulating area 37 from the bottom upward; a rectangular submerged water outlet hole is set at the outlet of the regulating sedimentation tank 3, and overflow water is used when the water volume is normal, and the orifice submerged water outlet method is used when large water volume needs to be adjusted.

[0062] In an optional embodiment, if Figure 5As shown, an alarm line, a minimum water level line, a filter cooling pump start water level line, a bypass lift pump start water level line, a high water level alarm line and an accident high water level alarm line are sequentially arranged above the bottom of the hot water well 39;

[0063] The filter lifting pipeline 5 is provided with a filter cooling pump group, which includes four filter cooling pumps. When the water level is lower than the alarm line, all the filter cooling pumps are turned off; when the water level is higher than the filter cooling pump start water level line, all the filter cooling pumps are turned on.

[0064] The bypass lift pipe 4 is provided with a bypass lift pump group, and the bypass lift pump group 41 includes three bypass lift pumps; when the water level is lower than the pump start water level line, at least two of the bypass lift pumps are turned off; when the water level is between the filter cooling pump start water level line and the bypass lift pump start water level line, at least one bypass lift pump is turned off; when the water level is between the bypass lift pump start water level line and the high water level alarm line, at least two bypass lift pumps are turned on; when the water level is higher than the high water level alarm line, all of the bypass lift pumps are turned on.

[0065] The filter cooling pump group and the bypass lift pump group 41 are controlled by the total water volume converted by the thickness of the rolled steel plate and the liquid level sensor of the regulating sedimentation tank 3. The total water volume is converted according to the thickness of the rolled steel plate to match the total water volume. According to the total water volume matching, the number of filter cooling pumps (4 in total) that need to be turned on, 1 pump is turned on under the minimum working condition, 3 pumps are turned on under the maximum working condition, and the last pump is used as a standby pump. When the liquid level in the regulating sedimentation tank 3 continues to rise, it means that the high and low pressure section quenching nozzles are turned on in advance or delayed. At this time, no steel plate passes through, that is, there is no heat exchange, so this part of the water volume can be filtered and cooled without cooling. Therefore, when the liquid level rises to the bypass lift water pump start water level, 1 to 2 water pumps in the bypass lift pump group 41 are turned on; when it reaches a high level, the third pump in the bypass lift pump group 41 is turned on.

[0066] In an optional embodiment, the high-pressure water supply pipeline is also connected to the iron groove 20 through the quenching machine high-pressure relief pipe 14, and the low-pressure water supply pipeline is also connected to the iron groove 20 through the quenching machine low-pressure relief pipe 13.

[0067] In order to avoid overcooling and protect the safety of the quenching water supply pipeline, a quenching machine high-pressure relief pipe 14 and a quenching machine low-pressure relief pipe 13 are respectively set at the quenching cooling water points. After the quenching cooling intensity is reached, the quenching machine high and low pressure water supply pumps 9 start to reduce the frequency and open the pressure relief valves on the high and low pressure relief pipelines of the quenching machine to discharge the quenching cooling water directly into the iron groove 20 back to the regulating sedimentation tank 3, and at the same time close the opening and closing valves in front of the high and low quenching nozzles of the quenching machine.

[0068] In an optional embodiment, if Figure 6As shown, it also includes a centralized control system 16 electrically connected to the quenching machine. The centralized control system 16 controls the quenching machine to perform high-pressure quenching and low-pressure quenching on plates of different thicknesses according to Table 1.

[0069] Table 1

[0070]

[0071]

[0072] In the embodiment of the present invention, a centralized control system 16 is used to control the water use of the quenching machine. Specifically, the centralized control system 16 controls the water use of the quenching machine according to the quenching plate production plan. As shown in Table 1, the quenching plate production plan automatically matches the flow and time of the high-pressure water system 1 and the low-pressure water system 2 during quenching according to the rolling specifications (thickness, width and length) of the quenching plate, thereby controlling the number and frequency conversion range of the subsequent filtering cooling pump, the quenching high-pressure water supply pump 10, and the quenching low-pressure water supply pump 9, and then accurately controlling the quenching water volume and quenching effect, avoiding insufficient quenching (not reaching the quenching cooling intensity, affecting the performance of the quenching plate) or excessive quenching (the quenching plate is overcooled, resulting in increased brittleness and reduced toughness of the steel plate, causing quality problems), and improving the quenching quality. When there is a new production plan, the above-mentioned typical quenching plate water meter can also be supplemented according to the cooling intensity.

[0073] In an optional embodiment, a liquid level transmitter is provided on the regulating sedimentation tank 3, a flow transmitter is provided on the filtering lifting pipeline 5, a liquid level transmitter and a current transformer are provided on the cooling tank, a pressure transmitter and a flow transmitter are provided on the high-pressure water supply pipeline, and a pressure transmitter and a flow transmitter are provided on the low-pressure water supply pipeline, and all of the liquid level transmitters, flow transmitters, current transformers, pressure transmitters and flow transmitters are connected to the centralized control system 16 signals;

[0074] The high-pressure water supply pipeline is provided with a high-pressure water supply pump 10, and the low-pressure water supply pipeline is provided with a low-pressure water supply pump 9. The centralized control system 16 is electrically connected to all the high-pressure water supply pumps 10, the low-pressure water supply pumps 9, the bypass boost pump and the filter cooling pump, and the control system is electrically connected to the filter 6, the cooling tower 7, the low-pressure filter 11 and the high-pressure water supply pipeline.

[0075] After the production rolling plan is input into the centralized control system 16, the subsequent quenching circulating water control system can automatically match and operate. The quenching circulating cooling water centralized control system 16, such as Figure 6 shown.

[0076] In this embodiment, the quenching water treatment system of the thick plate heat treatment line specifically includes the following steps:

[0077] 1) Enter the plate rolling thickness according to the production plan (see Table 1 for details, the plate model and water consumption can be further increased according to the plan), the system automatically matches the quenching water volume, automatically selects the number of quenching low-pressure water supply pumps 9 and quenching high-pressure water supply pumps 10 to be turned on according to the quenching water volume, and operates at a low frequency (about 20HZ), and simultaneously selects the number of filter booster pumps 51 to be turned on and operates. When the steel plate in the quenching furnace 15 is about to be taken out of the furnace (1 minute from the time of being taken out of the furnace), the inverters of the quenching low-pressure water supply pumps 9 and quenching high-pressure water supply pumps 10 start to accelerate the frequency (45-50HZ) to the required flow and pressure matching the quenching plate specification system and operate stably.

[0078] 2) The steel plate is sent to the quenching area for high and low pressure quenching. When the quenching cooling of the quenching plate reaches the set value, the bypass valves of the high and low pressure relief pipes are opened in sequence to relieve the pressure of the pipe network and close the high and low pressure quenching water supply pipelines to avoid excessive cooling of the quenching plate. At the same time, the inverters of the quenching low pressure water supply pump 9 and the quenching high pressure water supply pump 10 are decelerated and enter the low frequency (about 20HZ) operation state, thereby achieving energy saving and water saving and protecting the safety of the quenching pipe network. At this time, the quenching low pressure water supply pump 9 and the quenching high pressure water supply pump 10 return to the low frequency operation state, waiting for the next quenching furnace 15 steel plate to be taken out of the furnace.

[0079] 3) When the same specification of quenching plates are produced continuously, only the frequency reduction and frequency increase operations of the matching inverters of the quenching low-pressure water supply pump 9 and the quenching high-pressure water supply pump 10 are performed according to the production rhythm; when the specifications of the quenching plate are changed, the quenching water volume and the number of quenching water pumps are systematically re-matched according to the specifications of the next quenching plate, that is, returning to step 1).

[0080] 4) Because of the low-frequency operation of the water pump during the non-quenching time and the early and delayed start of the water pump, the non-quenching heat exchange water volume is generated. Therefore, according to the liquid level in the integrated adjustment sedimentation tank 3, combined with Figure 3 , select the number of bypass boost pumps to be opened to maintain the water balance in the system.

[0081] 5) Filter 6 filters according to the water quality after quenching. When the filtration reaches a certain level, the medium in filter 6 reaches the upper limit of the dirt interception capacity. At this time, the pressure at the inlet and outlet of filter 6 reaches the set value, and filter 6 stops filtering and performs backwashing. The backwashing of filter 6 provides two backwashing setting values ​​according to the water quality. One is set as timed backwashing, that is, backwashing is performed after running for a period of time, generally set to 12 to 24 hours, and the other is automatic backwashing according to the pressure difference between the inlet and outlet of filter 6 (when the inlet pressure is higher than the outlet pressure by 0.05MPa).

[0082] 6) According to the circulating water volume matching the quenching specifications, the number of cooling towers 7 to be opened is automatically selected, and the fan frequency of cooling tower 7 is automatically adjusted according to the water temperature feedback from the temperature sensor in the cooling pool of the circulating water system. When the water temperature is higher than the set water temperature by 35°C, high-frequency operation is performed; when the water temperature is lower than the set water temperature by 35°C, low-frequency operation is performed.

[0083] 7) The self-cleaning filter 6 installed on the high-pressure water supply pipeline and the low-pressure water supply pipeline filters according to the water quality in the cooling pool. When the filtration reaches a certain level, the medium in the filter 6 reaches the upper limit of the dirt interception capacity. At this time, the pressure at the inlet and outlet of the filter 6 reaches the set value (when the inlet pressure is higher than the outlet pressure by 0.03MPa), the self-cleaning filter 6 performs backwashing without stopping (continuous flow, using its own filtered water volume, about 5‰). The backwashing of the self-cleaning filter 6 can also be timed backwashing, that is, after running for a period of time (generally set to 4 to 6 hours), it performs full-automatic backwashing without stopping.

[0084] 8) Since the quenching circulating water is continuously circulated for cooling, the evaporation of water vapor causes the salt content to rise continuously, resulting in the deterioration of water quality, thus leaving marks on the surface of the steel plate. Therefore, after a period of operation, the circulating water must be desalted. The conductivity is usually controlled at ≤1100μS / cm. The circulating water quality in the cooling pool is monitored by an online conductivity meter. When the control value is exceeded, the electric valve of the sewage pipeline is opened to discharge salt and sewage, thereby ensuring the stability of the quenching water quality.

[0085] 9) Since evaporation, leakage and sewage discharge lead to a decrease in the amount of water in the circulating water system, thus affecting the water balance, an online liquid level sensor is installed in the cooling pool. When the water level is lower than the replenishing water level, the electric valve of the replenishing water pipeline is opened to replenish the system. When the water level in the cooling pool rises to the normal water level, the electric valve of the replenishing water pipeline is closed to stop replenishing the system.

[0086] 10) Issue and perform frequency conversion adjustment according to system instructions. Water consumption during quenching and quenching interval (rolling rhythm) (water consumption in high pressure section: 1800m 3 / h~6000m 3 / h, water consumption in low pressure section: 1000m 3 / h~6400m 3 / h) and water pressure regulation. When quenching thin plates, the water consumption is small and the quenching time is short; when quenching thick plates, the water consumption is large and the quenching time is long. Therefore, according to the different specifications of the quenching plates, 1 to 3 water pumps in the low and high pressure variable frequency water supply pump group are selected to start; at the same time, during the quenching interval, the low and high pressure variable frequency water supply pump group operates at a low frequency, and gradually increases the frequency to high frequency operation 1 minute before quenching, and reduces the frequency operation when leaving the high and low pressure section quenching. The use of variable frequency control reduces the power consumption while reducing the scale of subsequent structures and the capacity of equipment and facilities.

[0087] Compared with the applicant's original process (such as Figure 1 ), the energy consumption of the quenching water treatment system of the thick plate heat treatment line in this embodiment can be reduced by 25%, and the operating cost can be reduced by 30%.

[0088] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A quenching water treatment system for a thick plate heat treatment line, characterized in that: It includes a quenching machine and a sheet metal ditch for collecting high-pressure water system and low-pressure water system from the quenching machine, the outlet of the sheet metal ditch is connected to a regulating sedimentation tank, the regulating sedimentation tank is connected in series with a filter, a cooling tower and a cooling tank in sequence through a pipeline, and the regulating sedimentation tank is also directly connected to the cooling tank through a bypass lifting pipeline; The cooling pool is connected to the low-pressure water system of the quenching machine through a low-pressure water supply pipeline, and the cooling pool is connected to the high-pressure water system of the quenching machine through a high-pressure water supply pipeline.

2. The quenching water treatment system for thick plate heat treatment line according to claim 1 is characterized in that: The low-pressure water supply pipeline is provided with a low-pressure filter, and the high-pressure water supply pipeline is provided with a high-pressure filter.

3. The quenching water treatment system for thick plate heat treatment line according to claim 1 is characterized in that: One end of the regulating sedimentation tank is a water inlet end, and the other end is a water outlet end. The regulating sedimentation tank is sequentially provided with a water distribution area, a slag grabbing area and a regulating sedimentation area along the direction from the water inlet end to the water outlet end, and a slag grabbing bucket is provided above the slag grabbing area.

4. The quenching water treatment system for thick plate heat treatment line according to claim 1, characterized in that: The length-to-width ratio of the regulating sedimentation tank is greater than or equal to 4:1, the ratio of length to effective water depth is ≥8:1, and the residence time of water in the regulating sedimentation tank is greater than 30 minutes.

5. The quenching water treatment system for thick plate heat treatment line according to claim 3 is characterized in that: The outlet end of the regulating sedimentation tank is provided with a water outlet hole, the water outlet hole is connected to a pump room, a hot water well is provided below the pump room, and the pump room is provided with a filter lifting pipe connected to the filter and a bypass lifting pipe connected to the cooling tank.

6. The quenching water treatment system for thick plate heat treatment line according to claim 5, characterized in that: The regulating sedimentation area includes a sedimentation area, a sedimentation area and a water volume regulating area from bottom to top, and the setting height of the water outlet hole is the same as the bottom surface of the water volume regulating area.

7. The quenching water treatment system for thick plate heat treatment line according to claim 5, characterized in that: An alarm line, a minimum water level line, a filter cooling pump start water level line, a bypass lift pump start water level line, a high water level alarm line and an accident high water level alarm line are sequentially arranged above the bottom of the hot water well; The filter lifting pipeline is provided with a filter cooling pump group, which includes four filter cooling pumps. When the water level is lower than the alarm line, all the filter cooling pumps are turned off; when the water level is higher than the filter cooling pump start water level line, all the filter cooling pumps are turned on. A bypass lift pump group is arranged on the bypass lift pipeline, and the bypass lift pump group includes three bypass lift pumps; when the water level is lower than the filter cooling pump start water level line, at least two of the bypass lift pumps are turned off; when the water level is between the filter cooling pump start water level line and the bypass lift pump start water level line, at least one bypass lift pump is turned off; when the water level is between the bypass lift pump start water level line and the high water level alarm line, at least two bypass lift pumps are turned on; when the water level is higher than the high water level alarm line, all of the bypass lift pumps are turned on.

8. The quenching water treatment system for thick plate heat treatment line according to claim 1, characterized in that: The high-pressure water supply pipeline is also connected to the iron groove through the high-pressure pressure relief pipe of the quenching machine, and the low-pressure water supply pipeline is also connected to the iron groove through the low-pressure pressure relief pipe of the quenching machine.

9. The quenching water treatment system for thick plate heat treatment line according to claim 5, characterized in that: It also includes a centralized control system electrically connected to the quenching machine, and the centralized control system controls the quenching machine to perform high-pressure quenching and low-pressure quenching on plates of different thicknesses according to Table 1: Table 1 10. The quenching water treatment system for thick plate heat treatment line according to claim 9, characterized in that: The regulating sedimentation tank is provided with a liquid level transmitter, the filtering and lifting pipeline is provided with a flow transmitter, the cooling tank is provided with a liquid level transmitter and a current transformer, the high-pressure water supply pipeline is provided with a pressure transmitter and a flow transmitter, the low-pressure water supply pipeline is provided with a pressure transmitter and a flow transmitter, and all the liquid level transmitters, flow transmitters, current transformers, pressure transmitters and flow transmitters are connected to the centralized control system signal; The high-pressure water supply pipeline is provided with a high-pressure water supply pump, and the low-pressure water supply pipeline is provided with a low-pressure water supply pump. The centralized control system is electrically connected to all high-pressure water supply pumps, low-pressure water supply pumps, bypass lift pumps and filter cooling pumps, and the control system is electrically connected to the filter, cooling tower, low-pressure filter and high-pressure water supply pipeline.

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