CN209952396U - Special clean system of alkali lye - Google Patents
Special clean system of alkali lye Download PDFInfo
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- CN209952396U CN209952396U CN201920037785.8U CN201920037785U CN209952396U CN 209952396 U CN209952396 U CN 209952396U CN 201920037785 U CN201920037785 U CN 201920037785U CN 209952396 U CN209952396 U CN 209952396U
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Abstract
The utility model aims at providing a special purification system for alkali liquor, which comprises a circulating tank 3, wherein the circulating tank 3 is divided into a turbid liquid area A and a clear liquid area B by a partition plate; the iron removing module and the oil removing module can greatly reduce the concentration of iron in cleaning/alkali liquor, so that the surface cleaning effect of the strip steel is improved, the probability of the iron entering an annealing furnace is greatly reduced, the furnace condition is greatly improved, the occurrence of nodulation is prevented, and the surface quality of the strip steel is further ensured; the oil concentration in the cleaning/alkali liquor is greatly reduced, the influence of the oil on the cleaning effect is minimized, and the cleaning effect of the alkali liquor is improved; functional components in the cleaning/alkali liquor can be effectively preserved, and the performance of the alkali liquor is improved; greatly reduces the discharge of alkali liquor and COD, and greatly reduces the environmental protection load; greatly reduces the frequent active discharge caused by the overproof iron or oil, and greatly improves the utilization efficiency of the alkali liquor.
Description
Technical Field
The utility model relates to a special clean system of alkali lye.
Background
Cleaning solution/alkali liquor (hereinafter referred to as "alkali liquor") of a cleaning section circulating system of a cold rolling processing line in a steel mill is used for washing or assisting a brush roll to clean residual oil and residual iron left by a previous process on the surface of strip steel, and iron and oil left after washing are still harmful if remaining in the cleaning solution/alkali liquor, so that the cleaning solution/alkali liquor is required to be removed from the cleaning solution/alkali liquor, and the concentration is as low as possible;
at present, the existing production line treatment scheme only has a relatively mature iron removal scheme, but does not have a mature oil removal scheme; and:
1, the existing iron removal scheme:
1) most of the iron removal devices are rod chain type magnetic filters, the device has low filtration precision and high failure rate, and the separated iron powder has high water content and is not beneficial to the treatment of the next procedure;
2) most of the magnetic filters in other forms except the bar chain type magnetic filter or the drum type magnetic filter are installed without considering the reasonable process arrangement of the pipeline system, so that the treatment effect of the system is poor;
2, existing oil removal/ultrafiltration protocol:
the scheme is originally designed to remove oil mainly and belongs to molecular-level filtration, but the special properties of the circulating system alkali liquor, namely more iron, more suspended matters and high turbidity, cause the problem that the circulating system alkali liquor is mainly disturbed by iron powder and suspended matters, cannot filter oil in a targeted manner and cannot stably run for a long time. Meanwhile, the scheme needs back washing and has the defect of secondary pollution;
3, filtering scheme of filter materials of filter holes:
the technical scheme does not have a definite iron removal direction or an oil removal direction, and only takes away some oil wrapped on the surface of the iron powder and mixed with suspended matters while filtering the iron powder and the suspended matters, and a large amount of oil is still free in alkali liquor and is not removed; in addition, in the filtering scheme of the filtering materials, most of the filtering precision of the filtering materials is more than 50 microns, the filtering precision is basically higher than the main particle size range of the iron powder by 5-35 microns, and the filtering precision of the filtering materials to the iron powder is not high. Meanwhile, the scheme needs back washing and has the defect of secondary pollution;
therefore, the concentrations of iron and oil in the circulating tank of the circulating system are very high, ① causes poor cleaning effect of a cleaning section to affect the process cleaning effect, further causes the iron to enter the subsequent process and endanger the surface quality of strip steel, worsens the furnace condition of the annealing furnace, ② effective components in alkali liquor are consumed by oil, further causes low utilization efficiency and high energy consumption, ③ causes large alkali liquor discharge load and COD discharge load due to frequent alkali liquor discharge.
SUMMERY OF THE UTILITY MODEL
One purpose of the utility model is to provide a special clean system of alkali lye.
According to the utility model discloses an aspect provides a special clean system of alkali lye, this special clean system of alkali lye includes:
the circulating tank 3 is divided into a turbid liquid area A and a clear liquid area B by a partition plate;
a main line return port b arranged on the side close to the partition board of the turbid liquid area A, wherein the main line return port b is arranged at the middle lower part of the turbid liquid area A, and the main line return port b is sequentially communicated with the basket filter 2 and the on-line groove 1 through pipelines;
a suction port c is arranged at the middle lower part of the clear liquid area B and is sequentially communicated with the delivery pump 4 and the on-line groove 1 through a pipeline;
an iron removal module, the iron removal module includes: the device comprises a rotary drum type magnetic filter 7, a return port j and a suction port e, wherein the return port j is arranged at the middle lower part of the clear liquid area B, the suction port e is arranged at the middle lower part of the turbid liquid area A, and the return port j and the suction port e are respectively communicated with the rotary drum type magnetic filter 7 through pipelines;
an oil removal module, the oil removal module includes: the high-speed centrifugal separation device comprises a high-speed centrifugal separation device 13, a floating suction port 8 and a return port n, wherein the floating suction port 8 is arranged below the liquid level top liquid level of the cleaning liquid area B, the return port n is arranged below the liquid level of the cleaning liquid area B, and the floating suction port 8 and the return port n are respectively communicated with the high-speed centrifugal separation device 13 through pipelines.
Furthermore, in the above purification system for alkali lye, the main line return opening b adopts a large arc elbow, the large arc elbow of the main line return opening b is guided to the tank wall direction of the circulation tank 3 at the side of the turbid liquid area A far away from the lower partition plate 17, and the outlet forms a horizontal shape and forms an angle of less than or equal to 20 degrees with the tank side wall 18 of the circulation tank 3.
Furthermore, in the purification system special for alkali liquor, the return opening j adopts a large-radian elbow, the large-radian elbow of the return opening j is guided to the lower partition plate 17 on the side of the clear liquid zone B, and an angle form smaller than or equal to 20 degrees is formed on the side facing the lower partition plate 17.
Furthermore, in the purification system special for alkali liquor, the return opening n adopts a large-radian elbow, and the large-radian elbow of the return opening n is guided to the groove wall of the circulation tank 3 of the clear liquid zone B far away from the lower partition plate 17 and forms an angle form smaller than or equal to 20 degrees with the groove wall.
Furthermore, in the above purification system for alkali lye, the partition board comprises a lower partition board 17 and an upper partition board 16, wherein,
the lower partition plate 17 is arranged between the turbid liquid area A and the clear liquid area B, the upper partition plate 16 is arranged on the upper side of the turbid liquid area A close to the lower partition plate 17, a gap is formed between the upper partition plate 16 and the lower partition plate 17, and the lower partition plate 17 is used for blocking iron and suspended matters in the turbid liquid area A and enabling clear liquid to overflow to the clear liquid area B; the upper partition 16 is used for blocking the foam formed at the top of the turbid liquid area A from diffusing into the clear liquid area B.
Further, in the above purification system special for alkali liquor, the iron removal module further comprises a delivery pump 5, an outlet g and an adjusting valve 6, wherein,
the outlet g is arranged at the bottom of the turbid liquid area A;
one end of the delivery pump 5 is communicated with the suction port e through a pipeline, and the other end of the delivery pump 5 is communicated with the outlet g through a pipeline;
one end of the regulating valve 6 is communicated with a common node of the delivery pump 5 and the outlet g, and the other end of the regulating valve 6 is communicated with the rotary drum type magnetic filter 7.
Further, in the above-mentioned purification system for alkali lye, the suction port e is disposed at the opposite corner of the main line return port b, the transfer pump 5 pumps the dirty alkali lye from the turbid liquid area a of the circulation tank 3 with a transfer capacity about 1.5 times the throughput of the drum magnetic filter 7, wherein 2/3 is supplied to the drum magnetic filter 7 for iron separation, while the remaining 1/3 is returned to the turbid liquid area a of the circulation tank 3 through the outlet g disposed at the lower part of about 200mm from the suction port e for sufficient impact agitation of the alkali lye at that position under the control of the control valve 6.
Further, in the above-mentioned special clean system of alkali lye, the deoiling module still includes: a delivery pump 9, a primary filter system 10, a buffer tank 11, a delivery pump 12, an oil storage tank 14 and a slag tank 15, wherein,
one end of the delivery pump 9 is communicated with the floating suction port 8 through a pipeline, and the other end of the delivery pump 9 is communicated with the primary filtering system 10 through a pipeline;
one end of the buffer tank 11 is communicated with the primary filtering system 10 through a pipeline, and the other end of the buffer tank 11 is communicated with the delivery pump 12 through a pipeline;
one end of the high-speed centrifugal separation equipment 13 is communicated with the delivery pump 12 through a pipeline, and the other end of the high-speed centrifugal separation equipment 13 is communicated with the return port n through a pipeline;
the oil storage tank 14 is communicated with the high-speed centrifugal separation equipment 13 through a pipeline;
the slag groove 15 is respectively communicated with the primary filtering system 10 and the high-speed centrifugal separation equipment 13 through pipelines.
Further, in the purification system special for alkali liquor, clean alkali liquor output by the high-speed centrifugal separation equipment 13 is conveyed back to a clear liquor area B on one side of the circulation tank 3 far away from the lower partition plate 17 through a return opening n, and is further precipitated and stably layered in the clear liquor area B together with the clean alkali liquor overflowing the lower partition plate 17 and the clean alkali liquor filtered by the drum-type magnetic filter 7, and the clear alkali liquor on the upper part is conveyed to the online tank 1 through a pipeline by the conveying pump 4 to carry out a new round of flushing/cleaning work;
the oil phase output by the high-speed centrifugal separation equipment 13 is conveyed to an oil storage tank 14 through a pipeline;
and the slag phase output by the high-speed centrifugal separation equipment 13 is conveyed to a slag groove 15 of the oil removal module through a pipeline.
Furthermore, in the special purification system for alkali liquor, the suction port c is arranged below the lowest operation limit liquid level of the clear liquid zone B by 100 mm.
Compared with the prior art, the utility model can greatly reduce the concentration of iron in the cleaning/alkali liquor, not only improve the surface cleaning effect of the strip steel, but also greatly reduce the probability of the iron entering the annealing furnace, greatly improve the furnace condition, prevent the occurrence of nodulation and further ensure the surface quality of the strip steel; the oil concentration in the cleaning/alkali liquor is greatly reduced, the influence of the oil on the cleaning effect is minimized, and the cleaning effect of the alkali liquor is improved; functional components in the cleaning/alkali liquor can be effectively preserved, and the performance of the alkali liquor is improved; greatly reduces the discharge of alkali liquor and COD, and reduces the environmental protection load; greatly reduces the frequent active discharge caused by the overproof iron or oil, and greatly improves the utilization efficiency of the alkali liquor.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments made with reference to the following drawings:
FIG. 1 is a schematic view of a process flow of a purification system dedicated for alkali lye according to an embodiment of the present invention;
figure 2 shows a top view of the recycle tank of figure 1.
The same or similar reference numbers in the drawings identify the same or similar elements.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The utility model aims to minimize the iron content in the alkali liquor on the premise of minimizing the foam generation amount as much as possible so as to eliminate the influence of the iron content on the surface quality of the strip steel and reduce the influence of the iron content on the furnace condition of the annealing furnace, minimize the oil content in the alkali liquor on the premise of minimizing the foam generation amount so as to reduce the possibility of damaging ① cleaning/effective components of the alkali liquor (efficiency improvement: improvement of cleaning/alkali liquor cleaning effect), reduce ② the existence of the alkali liquor so as to form isolation between the cleaning/alkali liquor and the strip steel and further generate negative influence on the cleaning effect, and reduce ③ the frequent active emission of a large amount of alkali liquor and the consequent emission of a large amount of COD (efficiency improvement: improvement of cleaning/alkali liquor utilization efficiency, emission reduction: reduction of COD emission) caused by the high concentration of the alkali liquor.
Aiming at the current process situation, aiming at the process targets of removing iron and oil and reducing the concentration of the iron and oil to the minimum, various schemes are analyzed and evaluated in a targeted manner, and finally, a scientific, reasonable and most operable scheme, namely a special alkali liquor purification system, is selected and implemented.
As shown in FIGS. 1-2, the purification system for alkali lye comprises:
the circulating tank 3 is divided into a turbid liquid area A and a clear liquid area B by a partition plate;
a main line return port b arranged on the side close to the partition board of the turbid liquid area A, wherein the main line return port b is arranged at the middle lower part of the turbid liquid area A, and the main line return port b is sequentially communicated with the basket filter 2 and the on-line groove 1 through pipelines;
a suction port c is arranged at the middle lower part of the clear liquid area B and is sequentially communicated with the delivery pump 4 and the on-line groove 1 through a pipeline;
an iron removal module, the iron removal module includes: the device comprises a rotary drum type magnetic filter 7, a return port j and a suction port e, wherein the return port j is arranged at the middle lower part of the clear liquid area B, the suction port e is arranged at the middle lower part of the turbid liquid area A, and the return port j and the suction port e are respectively communicated with the magnetic rotary drum type magnetic filter 7 through pipelines;
an oil removal module, the oil removal module includes: the high-speed centrifugal separation device comprises a high-speed centrifugal separation device 13, a floating suction port 8 and a return port n, wherein the floating suction port 8 is arranged below the liquid level top liquid level of the cleaning liquid area B, the return port n is arranged below the liquid level of the cleaning liquid area B, and the floating suction port 8 and the return port n are respectively communicated with the high-speed centrifugal separation device 13 through pipelines.
The utility model discloses a special clean system of alkali lye in an embodiment, thread return opening b adopts the large radian elbow, thread return opening b's large radian elbow direction is to the cell wall direction of the recycle tank 3 of baffle 17 side under keeping away from of turbid liquid district A, and the export forms horizontal form to form not more than 20 angles with the groove lateral wall 18 of recycle tank 3.
The utility model discloses a special clean system of alkali lye in an embodiment, return a mouthful j adopts the large radian elbow, the large radian elbow of return a mouthful j leads to the lower baffle 17 to clear liquid district B side to 17 sides formation is less than or equal to 20 angle forms downwards at the face.
The utility model discloses a special clean system of alkali lye in an embodiment, return a mouthful n and adopt the large radian elbow, return a mouthful n's large radian elbow direction to clear liquid district B keep away from down the cell wall of the recycle tank 3 of baffle 17 side to form towards with the groove wall side and be less than or equal to 20 angle forms.
In one embodiment of the purification system special for alkali lye of the utility model, the clapboard comprises a lower clapboard 17 and an upper clapboard 16, wherein,
the lower partition plate 17 is arranged between the turbid liquid area A and the clear liquid area B, the upper partition plate 16 is arranged on the upper side of the turbid liquid area A close to the lower partition plate 17, a gap is formed between the upper partition plate 16 and the lower partition plate 17, and the lower partition plate 17 is used for blocking iron and suspended matters in the turbid liquid area A and enabling clear liquid to overflow to the clear liquid area B; the upper partition 16 is used for blocking the foam formed at the top of the turbid liquid area A from diffusing into the clear liquid area B.
In one embodiment of the purification system special for alkali liquor of the utility model, the iron removal module further comprises a delivery pump 5, an outlet g and an adjusting valve 6, wherein,
the outlet g is arranged at the bottom of the turbid liquid area A;
one end of the delivery pump 5 is communicated with the suction port e through a pipeline, and the other end of the pump 5 is communicated with the outlet g through a pipeline;
one end of the regulating valve 6 is communicated with a common node of the delivery pump 5 and the outlet g, and the other end of the regulating valve 6 is communicated with the rotary drum type magnetic filter 7.
The utility model discloses a special clean system of alkali lye in an embodiment, suction inlet e sets up in the diagonal angle of thread backward flow mouth b, the delivery pump 5 is with the conveying capacity of rotary drum magnetic filter 7 handling capacity about 1.5 times, extracts dirty alkali lye from the turbid liquid district A of circulation tank 3, and wherein, 2/3's flow is carried to rotary drum magnetic filter 7 and is carried out the iron separation, and remaining 1/3's flow process adjusting valve 6's control flows back to circulation tank 3 turbid liquid district A through export g in, export g sets up at the distance suction inlet e about 200 mm's lower part carries out abundant impact stirring to the alkali lye of this position.
In one embodiment of the special purification system for alkali lye of the utility model, an oil storage tank 14 and a slag liquid hopper tank 15 are provided, wherein one end of the delivery pump 9 is communicated with the floating suction port 8 through a pipeline, and the other end of the delivery pump 9 is communicated with the primary filtration system 10 through a pipeline;
one end of the buffer tank 11 is communicated with the primary filtering system 10 through a pipeline, and the other end of the buffer tank 11 is communicated with the delivery pump 12 through a pipeline;
one end of the high-speed centrifugal separation equipment 13 is communicated with the delivery pump 12 through a pipeline, and the other end of the high-speed centrifugal separation equipment 13 is communicated with the return port n through a pipeline;
the oil storage tank 14 is communicated with the high-speed centrifugal separation equipment 13 through a pipeline;
the slag groove 15 is respectively communicated with the primary filtering system 10 and the high-speed centrifugal separation equipment 13 through pipelines.
In one embodiment of the special purification system for alkali liquor of the utility model, clean alkali liquor output by the high-speed centrifugal separation device 13 is conveyed back to the clear liquor area B on one side of the circulation tank 3 away from the lower partition plate 17 through the return opening n, and together with clean alkali liquor overflowing the lower partition plate 17 and clean alkali liquor filtered by the rotary drum type magnetic filter 7, after further precipitation and stable stratification in the clear liquor area B, the alkali liquor with a clearer upper part is conveyed to the online groove 1 through the pipeline d by the conveying pump 4 to carry out a new round of washing/cleaning work;
the oil phase output by the high-speed centrifugal separation equipment 13 is conveyed to an oil storage tank 14 through a pipeline;
and the slag phase output by the high-speed centrifugal separation equipment 13 is conveyed to a slag groove 15 of the oil removal module through a pipeline.
In one embodiment of the purification system special for alkali lye of the present invention, the suction port c is disposed at 100mm below the lowest limit liquid level of the operation of the clear liquid zone B.
Specifically, in the above-mentioned deironing module:
1) a drum type magnetic filter (hereinafter referred to as magnetic filtration) is used as core equipment of the iron removal system, and the equipment has the characteristics of high filtration precision and low failure rate, so that the equipment can better complete the key task of removing iron powder;
2) on the technical arrangement of an alkali liquor conveying pipeline, the influence on the cleaning/alkali liquor state on the design of the shapes of a suction port, a return port and an elbow thereof and the pipeline trend on the basis of the fluid mechanics principle is fully considered, and reasonable and targeted design is carried out, particularly, the suction port e is required to be arranged at the bottom of a turbid liquid area A close to which iron is concentrated; secondly, the return port j returns to the clear liquid zone B, and is flushed below the liquid level of the clear liquid zone B by the lower partition plate 17 at a short distance and a small angle in a large-radian elbow form, so that the optimal treatment effect of optimal iron removal effect and lowest foam generation condition can be achieved;
3) the conveying pump 5 pumps dirty alkali liquor from a turbid liquid area A of the circulating tank 3 by a conveying amount which is about 1.5 times of the treatment amount of the rotary drum type magnetic filter 7 (a suction port e is arranged at the opposite angle of a main line return port b and is about 400mm away from the bottom of the tank), wherein the flow of 2/3 is conveyed to the rotary drum type magnetic filter 7 through a pipeline h for iron separation, the flow of the residual 1/3 is controlled by an adjusting valve 6 and sequentially flows back to the turbid liquid area A of the circulating tank 3 through a return pipe f and an outlet g, the outlet g is arranged at the bottom which is about 200mm away from the suction port e, the alkali liquor at the position is subjected to sufficient impact stirring, and the deposited iron at the position is floated, so that the conveying pump 5 can convey the dirty alkali liquor to the magnetic filter 7 for effective iron separation;
4) after the high-precision filtration of the magnetic filtration 7, the iron or the iron wrapping the oil sludge is separated and distributed to the iron powder slag hopper, and the filtered clean alkali liquor naturally flows back to one side of the circulation tank 3 close to the clean liquor area B of the lower partition plate 17 through the conveying pipeline i connected with the bottom of the magnetic filtration 7, so that the clean alkali liquor is concentrated in the clean liquor area and flows into the lower partition plate 17 through the large-radian elbow small-angle side flushing of the port j to enter the clean liquor area B. After the clean alkali liquid overflowing the lower partition plate 17 and the clean alkali liquid separated by the oil removal module are further precipitated and stably layered in the clean liquid zone B, the cleaner alkali liquid at the upper part is conveyed to the online groove 1 through the main line backflow pipe d by the conveying pump 4 to perform a new round of flushing/cleaning work.
Among the above-mentioned deoiling module:
1) the method effectively avoids the defects that the filter holes are easy to block and the back washing method has secondary pollution in the traditional filter hole filtering and back washing method, can continuously work, and has high separation efficiency and good effect;
2) on the process arrangement of the alkali liquor conveying pipeline, the following steps are fully considered: firstly, the function of the primary filtering system 10 is set, so that most of iron is treated in the link, and the high-speed centrifugal separation equipment 13 can perform oil removal work in a 'concentration' manner; secondly, on the basis of the fluid mechanics principle, reasonable and targeted design is carried out on the influence of the design of the shapes of the elbows and the pipeline trends of the floating suction port 8, the return port n and the return port n on the state of the alkali liquor, and particularly, the floating suction port 8 is arranged below the liquid level of the liquid level top of the clear liquid area B with concentrated oil content and is extracted in the form of the floating suction port 8; the return opening n is returned to the clear liquid zone B, is far away from one side of the lower partition plate 17 and rushes to the wall of the circulating tank at the side of the clear liquid zone B far away from the lower partition plate 17 to enter the position below the liquid level at a short distance and a small angle in the form of a large-radian elbow of the return opening n, so that the optimal treatment effect of optimal oil removal effect and lowest foam generation condition can be achieved;
3) a floating suction port 8 is arranged below the liquid level of the clear liquid zone B by about 150mm, the floating suction port is connected to a pipeline arranged at the bottom of the tank wall through a hose at the bottom and is connected to a delivery pump 9, the alkali liquid rich in oil at the top of the liquid level of the clear liquid zone B passes through the floating suction port 8 and is delivered to an oil removal module by the delivery pump 9, the alkali liquid firstly enters a primary filtering system 10 and is filtered by the primary filtering system 10, and most iron in the alkali liquid, especially large-particle iron, is treated and separated into a slag tank 15 of the oil removal module;
4) the alkali liquor treated by the primary filtering system 10 enters the buffer tank 11, and is conveyed to the high-speed centrifugal separation module equipment 13 for oil separation operation through the conveying pump 12 after the sedimentation and overflow of the partition plates in the buffer tank 11;
5) in the high-speed centrifugal separation equipment 13, under the centrifugal force action of the alkali liquor at the rotating speed of 8000-12000 rpm, oil, clear liquid and slag are separated and layered, and are respectively conveyed to corresponding positions through a three-phase channel in the high-speed centrifugal separation equipment 13:
a) clean alkali liquor output by the high-speed centrifugal separation equipment 13 is conveyed back to a clear liquid area B on one side of the circulating tank 3 far away from the lower partition plate 17 through a pipeline m, and flows into the clear liquid area B through a large-radian elbow with a return opening n and a small-angle side flushing to the tank wall of the circulating tank 3, the clear liquid area B is filled with the clean alkali liquor overflowing the lower partition plate 17 and the clean alkali liquor filtered by the drum-type magnetic filter 7, and after further precipitation and stable layering in the clear liquid area B, the clear alkali liquor on the upper part is conveyed to the online tank 1 through a main line return flow pipe d by the conveying pump 4 to carry out a new round of flushing/cleaning work;
b) the oil phase output by the high-speed centrifugal separation equipment 13 is conveyed to the oil storage tank 14 through a pipeline o under the action of a centripetal pump;
c) the slag phase output by the high-speed centrifugal separation equipment 13 is conveyed to a slag tank of the oil removal module after the slag is regularly discharged, and then conveyed to a slag groove 15 of the oil removal module through a pipeline p under the action of a pneumatic diaphragm pump;
6) the concentrated dirty liquid in the slag groove 15 contains a large amount of suspended matters including a small part of fine iron, certain oil and a large amount of suspended matters, and after the filtration and the precipitation of the slag groove 15, the filtered alkali liquor flows back to the cache tank 11 again and enters the circular processing flow again.
In the circulation tank and the main circulation:
a partition plate is arranged in the middle of the circulating tank 3, and comprises a lower partition plate 17 and an upper partition plate 16, wherein the lower partition plate 17 is arranged between the turbid liquid area A and the clear liquid area B, the upper partition plate 16 is arranged on the upper side of the turbid liquid area A close to the lower partition plate 17, a gap is formed between the upper partition plate 16 and the lower partition plate 17, and the lower partition plate 17 is used for blocking a large amount of iron and suspended matters in the turbid liquid area A and enabling clear liquid to overflow to the clear liquid area B; the upper partition plate 16 is used for blocking the foam formed at the top of the turbid liquid area A from diffusing into the clear liquid area B so as to divide the tank body into the turbid liquid area A and the clear liquid area B;
1) in the circulation a-b-c-d, a main line return pipe a returns the cleaning/alkali liquor which is flushed/cleaned by the online tank 1 and carries a large amount of iron and oil to the turbid liquid area A from the side of the turbid liquid area, close to the lower partition plate 17, the upper partition plate 16 and the side wall 18, through a large-radian elbow (the outlet is in the horizontal direction) of a main line return opening b of the pipeline, and the flow direction can form a stable horizontal circulation flow in the turbid liquid area A, and the iron in the alkali liquor can not be precipitated to the bottom of the circulation tank 3 to the maximum extent and can be deposited;
2) in the turbid liquid area A, under the drive of a continuous stable circulating flow formed by the alkali liquid at the main line return opening b, iron, particularly large-particle iron, tends to move towards the bottom, while oil tends to move towards the top, so that the upper part of the whole body is cleaner, and the bottom is more turbid; the clear alkali liquor on the upper part overflows to a clear liquid zone B from the top of a lower partition plate 17, and the clear alkali liquor, the clear alkali liquor after being filtered by the magnetic filter 7 and the clear alkali liquor after being subjected to oil separation by the oil removal module are subjected to further sedimentation and stable layering in the clear liquid zone B, and then the clear alkali liquor on the upper part is conveyed to the online tank 1 by a conveying pump 4 through a main line return pipe d to carry out a new round of flushing/cleaning work;
3) on the wall of the clear liquid zone B far away from the lower partition 17, a main circulation suction port c is arranged at a position 100mm below the lowest limit liquid level of the clear liquid zone B in operation, and the position can ensure that not only can the foam of the liquid level not be sucked into the conveying pipeline, but also can ensure that the cleanest alkali liquor in the clear liquid zone can be conveyed to the on-line groove 1 through the conveying pump 4 to work, wherein the lowest limit liquid level means that the clear liquid zone B is lower than the liquid level, and the special purification system for the alkali liquor cannot work.
In one embodiment, the utility model discloses a work flow does: the iron removal module is started before the oil removal module in work, and the oil removal module is started after the iron removal module works normally for 12 hours.
In one embodiment, the main line return port b, the return port j and the return port n adopt large-radian elbows, and the process turning of the conveying pipelines a, d, h, i, k, l and m adopts the large-radian elbows to be connected as much as possible so as to avoid the increase of foams caused by vertical impact brought by 90 elbows; the large-radian elbows of the main line return port b, the return port j and the return port n are used as return pipes to enter the circulating tank 3. Firstly, large-radian elbows of a main line return port b, a return port j and a return port n are inserted into a liquid level and cannot be suspended above the liquid level; secondly, the large-radian elbows of the main line return port b, the return port j and the return port n are guided to the tank wall and form a small-angle shape with the tank wall, preferably less than or equal to 20 degrees, wherein the large-radian elbow of the main line return port b is guided to the tank wall direction of the circulation tank 3 at the side of the turbid liquid area A far away from the lower partition plate 17, and an outlet forms a horizontal shape and forms an angle of less than or equal to 20 degrees with the tank side wall 18 of the circulation tank 3; the large-radian elbow of the return opening j is guided to the lower partition plate 17 on the side of the clear liquid zone B, and an angle form smaller than or equal to 20 degrees is formed on the side facing the lower partition plate 17; the large-radian elbow of the return opening n is guided to the groove wall of the circulation tank 3 of the clear liquid area B far away from the lower partition plate 17, and forms an angle shape smaller than or equal to 20 degrees with the groove wall side.
The iron removing module of the utility model can fully separate iron under the premise of inhibiting the generation of foam as much as possible, so that the iron content of the alkali liquor in the circulating system is reduced to the minimum, and the influence of the iron content on the surface quality of the strip steel is eliminated; and the influence on the furnace condition caused by the entrainment in the annealing furnace is reduced; meanwhile, the probability that furnace roller nodulation is generated due to the existence of the furnace roller nodulation and further the surface quality of the strip steel is influenced or the furnace roller nodulation falls on the surface of the strip steel and directly influences the surface quality of the strip steel is reduced. The current operation effect can reach about 300ppm (original value is 1000-8000 ppm) of the iron content of the alkali liquor in the circulating tank 3.
The utility model discloses an deoiling module is under the prerequisite that restraines the foam production as far as possible, the abundant separation that carries on oil, can: the probability of damaging the effective components of the cleaning/alkali liquor is greatly reduced; the phenomenon that the cleaning effect is negatively influenced due to the isolation between the cleaning/alkali liquor and the strip steel caused by the existence of the cleaning/alkali liquor is reduced; the discharge of a large amount of alkali liquor and COD caused by the discharge of a large amount of alkali liquor due to high concentration of the alkali liquor are reduced. Thereby improving the cleaning effect (process effect) of the alkali liquor; the utilization efficiency of the alkali liquor is improved (energy saving and emission reduction); effectively controlling the discharge of alkali liquor and COD (emission reduction/environmental protection). The operation effect can reach 400-500 ppm (original value is 1000-30000 ppm) of alkali lye oil in the circulating tank 3.
In one embodiment, the process is implemented by a cleaning section circulating system of a continuous annealing production line in a cold-rolled tin plate factory:
through the utility model discloses an iron removal module is alkali brush circulating tank deironing system promptly: conveying dirty alkali liquor containing iron and oil from the bottom of a turbid liquor area A of an alkali brush circulating tank 3 to a rotary drum type magnetic filter 7 through a conveying pump 5 (part of the dirty alkali liquor flows back to the bottom of a tank body for backflushing so as to suspend iron powder and further convey the iron powder to the rotary drum type magnetic filter 7 as much as possible), separating and scraping most of iron after the rotary drum type magnetic filter 7 works to an iron powder slag hopper, and returning the separated clean cleaning/alkali liquor to a clear liquor area B of the alkali brush circulating tank 3 through a pipeline i and a large-radian elbow at a port j through a lower partition plate 17 on the tank wall;
through the utility model discloses an iron removal module is electrolysis circulating tank deironing system promptly: conveying dirty alkali liquor containing iron and oil from the bottom of a turbid liquor area A of an electrolytic circulating tank 3 to a rotary drum type magnetic filter 7 through a conveying pump 5 (part of the dirty alkali liquor flows back to the bottom of a tank body for backflushing so as to suspend iron powder and further conveys the iron powder to the rotary drum type magnetic filter 7 as much as possible), separating and scraping most of iron content to an iron powder slag hopper after the rotary drum type magnetic filter 7 works, and returning the separated clean cleaning/alkali liquor to a clear liquor area B of the electrolytic circulating tank 3 through a pipeline i and a large-radian elbow j at the terminal through a lower partition plate 17 on the tank wall;
through the utility model discloses an alkali brush circulation tank deoiling system is promptly to deoiling module: through unsteady suction inlet 8 at clear liquid district B liquid level top, and through pipeline k, dirty lye that is rich in oil content and a small amount of iron content on the liquid level surface is carried to the primary filter 10 module from 3 clear liquid district B tops of alkali brush circulation jar through delivery pump 9, through the work of primary filter 10 equipment, separate most iron content wherein, the iron content after the separation is scraped off to the slag chute 15 of deoiling module, after being separated, the dirty lye of few indisputable many oils, get into the buffer tank 11 of 10 module next links of primary filter, after baffle overflow and deposit in buffer tank 11, through delivery pump 12, be carried to high-speed centrifugal separation equipment 13, through high-speed (8000 ~ 12000rpm) centrifugal separation's work, dirty lye is stratified: oil, clear alkali liquor and slag (including a small amount of iron and suspended matters), wherein the oil is conveyed to an oil storage tank 14 (entering a solid waste treatment process); clear alkali liquor passes through a pipeline m and a large-radian elbow n at the terminal, passes through the groove wall at one side far away from the lower partition plate 17, and is conveyed back to a clear liquid area B of the alkali brush circulating tank 3; the slag is temporarily stored in a slag box through a pipeline q and is conveyed to a slag groove 15 through a pneumatic diaphragm pump; the sediment groove 15 is through the accumulation sediment, and the supernatant overflows back to buffer tank 11, and the solid phase that remains progressively accumulates, finally gets into solid useless processing flow.
Through the utility model discloses an deoiling module is electrolysis circulating tank deoiling system promptly: through unsteady suction inlet 8 at clear liquid district B liquid level top, and through pipeline k, dirty lye that is rich in oil content and a small amount of iron content on the liquid level surface is carried to the primary filter 10 module from 3 clear liquid district B tops of electrolysis circulating tank through delivery pump 9, through the work of primary filter 10 equipment, separate most iron content wherein, the iron content after the separation is scraped off to the slag chute 15 of deoiling module, after being separated, the dirty lye of few indisputable many oils, get into the buffer tank 11 of 10 module next links of primary filter, behind baffle overflow and deposit in buffer tank 11, through delivery pump 12, be carried to high-speed centrifugal separation equipment 13, through high-speed (8000 ~ 12000rpm) centrifugal separation's work, dirty lye is stratified: oil, clear alkali liquor and slag (including a small amount of iron and suspended matters), wherein the oil is conveyed to an oil storage tank 14 (entering a solid waste treatment process); clear alkali liquor passes through the large-radian elbow of the pipeline m and the return opening n, passes through the groove wall at one side far away from the lower partition plate 17, and is conveyed back to a clear liquid area B of the electrolytic circulating tank 3; the slag is temporarily stored in a slag box through a pipeline q and is conveyed to a slag groove 15 through a pneumatic diaphragm pump; the sediment groove 15 is through the accumulation sediment, and the supernatant overflows back to buffer tank 11, and the solid phase that remains progressively accumulates, finally gets into solid useless processing flow.
After a period of operation, the effects that can be achieved are: the iron content concentration is as follows: about 300ppm (about 1000-8000 ppm originally); oil content concentration: about 450ppm (originally about 1000 to 30000 ppm).
The utility model can greatly reduce the concentration of iron in the cleaning/alkali liquor, not only improve the surface cleaning effect of the strip steel, but also greatly reduce the probability of the iron entering the annealing furnace, greatly improve the furnace condition, further prevent the occurrence of nodulation and further ensure the surface quality of the strip steel; the oil concentration in the cleaning/alkali liquor is greatly reduced, the influence of the oil on the cleaning effect is minimized, and the cleaning effect of the alkali liquor is improved; functional components in the cleaning/alkali liquor can be effectively preserved, and the performance of the alkali liquor is improved; greatly reduces the discharge of alkali liquor and COD, and reduces the environmental protection load; greatly reduces the frequent active discharge caused by the overproof iron or oil, and greatly improves the utilization efficiency of the alkali liquor.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.
It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned. Furthermore, it is obvious that the word "comprising" does not exclude other elements or steps, and the singular does not exclude the plural. A plurality of units or means recited in the apparatus claims may also be implemented by one unit or means in software or hardware. The terms first, second, etc. are used to denote names, but not any particular order.
Claims (8)
1. The utility model provides a special clean system of lye, wherein, this special clean system of lye includes:
the circulating tank (3) is divided into a turbid liquid area (A) and a clear liquid area (B) by a partition plate;
a main line return port (b) arranged on the side of the turbid liquid zone (A) close to the partition plate, wherein the main line return port (b) is arranged at the middle lower part of the turbid liquid zone (A), and the main line return port (b) is sequentially communicated with the basket filter (2) and the online groove (1) through pipelines;
the first suction port (c) is arranged at the middle lower part of the clear liquid area (B), and is sequentially communicated with the second delivery pump (4) and the online groove (1) through a pipeline;
an iron removal module, the iron removal module includes: the device comprises a rotary drum type magnetic filter (7), a first return opening (j) and a second suction opening (e), wherein the first return opening (j) is arranged at the middle lower part of the clear liquid area (B), the second suction opening (e) is arranged at the middle lower part of the turbid liquid area (A), and the first return opening (j) and the second suction opening (e) are respectively communicated with the rotary drum type magnetic filter (7) through pipelines;
an oil removal module, the oil removal module includes: high-speed centrifugal separation equipment (13), unsteady suction inlet (8) and second return (n), wherein, unsteady suction inlet (8) set up in below the liquid level at the liquid level top in clear liquid district (B), second return (n) set up in below the liquid level in clear liquid district (B), unsteady suction inlet (8) and second return (n) respectively through the pipeline with high-speed centrifugal separation equipment (13) intercommunication.
2. The purification system special for alkali liquor according to claim 1, wherein the main line return port (b) adopts a large-arc elbow, the large-arc elbow of the main line return port (b) is guided to the direction of the tank wall of the circulation tank (3) at the side of the turbid liquid zone (A) far away from the lower partition plate (17), and the outlet forms a horizontal shape and forms an angle of less than or equal to 20 degrees with the tank side wall 18 of the circulation tank (3).
3. The purification system special for alkali liquor according to claim 1, wherein the first return opening (j) adopts a large-arc elbow, the large-arc elbow of the first return opening (j) is guided to the lower partition plate (17) on the side of the clear liquid zone B, and an angle form smaller than or equal to 20 degrees is formed on the side facing the lower partition plate (17).
4. The purification system special for alkali lye as claimed in claim 1 wherein the second return opening (n) adopts a large arc elbow, the large arc elbow of the second return opening (n) leads to the tank wall of the circulation tank (3) at the side of the clear liquid zone (B) far from the lower clapboard (17) and forms an angle form of less than or equal to 20 degrees with the tank wall side.
5. The lye special purification system according to claim 1, wherein the partition comprises a lower partition (17) and an upper partition (16), wherein,
the lower partition plate (17) is arranged between the turbid liquid area (A) and the clear liquid area (B), the upper partition plate (16) is arranged on the upper side of the turbid liquid area (A) close to the lower partition plate (17), a gap is formed between the upper partition plate (16) and the lower partition plate (17), and the lower partition plate (17) is used for blocking iron and suspended matters in the turbid liquid area (A) and enabling clear liquid to overflow to the clear liquid area (B); the upper partition plate (16) is used for blocking the foam formed at the top of the turbid liquid area (A) in the turbid liquid area (A) from diffusing to the clear liquid area (B).
6. The lye special purification system according to claim 5, wherein the iron removal module further comprises a third delivery pump (5), an outlet (g) and a regulating valve (6), wherein,
the outlet (g) is arranged at the bottom of the turbid liquid zone (A);
one end of the third delivery pump (5) is communicated with the second suction port (e) through a pipeline, and the other end of the third delivery pump (5) is communicated with the outlet (g) through a pipeline;
one end of the regulating valve (6) is communicated with a common node of the third delivery pump (5) and the outlet (g), and the other end of the regulating valve (6) is communicated with the rotary drum type magnetic filter (7).
7. The lye special purification system of claim 6, wherein the oil removal module further comprises: a fourth delivery pump (9), a primary filter system (10), a buffer tank (11), a first delivery pump (12), an oil storage tank (14) and a slag liquid bucket tank (15), wherein,
one end of the fourth delivery pump (9) is communicated with the floating suction port (8) through a pipeline, and the other end of the fourth delivery pump (9) is communicated with the primary filtering system (10) through a pipeline;
one end of the buffer tank (11) is communicated with the primary filtering system (10) through a pipeline, and the other end of the buffer tank (11) is communicated with the first delivery pump (12) through a pipeline;
one end of the high-speed centrifugal separation equipment (13) is communicated with the first delivery pump (12) through a pipeline, and the other end of the high-speed centrifugal separation equipment (13) is communicated with the second return port (n) through a pipeline;
the oil storage tank (14) is communicated with the high-speed centrifugal separation equipment (13) through a pipeline;
and the slag liquid hopper tank (15) is communicated with the primary filtering system (10) and the high-speed centrifugal separation equipment (13) through pipelines respectively.
8. The lye special purification system according to claim 7, wherein the first suction opening (c) is placed 100mm below the operational minimum limit level of the clear liquid zone (B).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920037785.8U CN209952396U (en) | 2019-01-09 | 2019-01-09 | Special clean system of alkali lye |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920037785.8U CN209952396U (en) | 2019-01-09 | 2019-01-09 | Special clean system of alkali lye |
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| CN209952396U true CN209952396U (en) | 2020-01-17 |
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| CN201920037785.8U Active CN209952396U (en) | 2019-01-09 | 2019-01-09 | Special clean system of alkali lye |
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