CN110559703A - water quantity balancing method for upward flow filter - Google Patents
water quantity balancing method for upward flow filter Download PDFInfo
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- CN110559703A CN110559703A CN201910771134.6A CN201910771134A CN110559703A CN 110559703 A CN110559703 A CN 110559703A CN 201910771134 A CN201910771134 A CN 201910771134A CN 110559703 A CN110559703 A CN 110559703A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D24/00—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof
- B01D24/02—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof with the filter bed stationary during the filtration
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D24/00—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof
- B01D24/48—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof integrally combined with devices for controlling the filtration
- B01D24/4884—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof integrally combined with devices for controlling the filtration by pressure measuring
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Abstract
The invention relates to the technical field of water treatment, and discloses a water quantity balancing method for an upward flow filter tank, which comprises a self-adaptive adjusting step, wherein the self-adaptive adjusting step comprises the following steps: s1, obtaining a pressure value F at the water inlet of each filter body; s2, marking the pressure grade of each filter body as follows according to the pressure value at the water inlet of each filter body: 1. 2, …, k, …, n-1, n, wherein, F1＞F2…＞Fk＞…＞Fn－1＞FnK and n are positive integers; s3, adjusting the opening degree V of each adjusting valve to ensure that V1＜V2…＜Vk＜…＜Vn－1＜Vn(ii) a S4, returning to S1 for circulation. The water quantity balancing method of the upward flow filter tank in the technical scheme of the invention is easy to adjust the water inflow of the filter tank, avoids the hydraulic penetration phenomenon of a filter material layer caused by overlarge filter speed of a specific filter tank body, and prolongs the service life of an adjusting valveMeanwhile, the problem of feedback lag of the traditional method is avoided.
Description
Technical Field
The invention relates to the technical field of water treatment, in particular to a water quantity balancing method for an upward flow filter tank.
background
in the prior art, the upward flow filtration mode has very remarkable advantages in water supply and sewage treatment, but the problem of uniform water distribution of the filter, namely water quantity load control always influences the wide application of the filtration mode. The filter tank adopts a multi-grid parallel connection mode during operation, so that the total water to be treated needs to be uniformly distributed to each grid of filter tank, so that each grid of filter tank can be ensured to work under the designed water load, if the water to be treated is unevenly distributed, the situation that the treated water amount of a certain grid of filter tank is excessively increased and exceeds the designed allowable water load can occur, and at the moment, the filter tank penetration phenomenon can occur, the effluent quality is seriously influenced, and therefore, the water amount load control of the filter tank is a very important problem in the application of the filtering process.
At present, most of filter tanks adopt a control algorithm to keep the liquid level constant, and when a large disturbance or a large change of a given value exists, because a large deviation exists at the moment and the system has inertia and hysteresis, a large overshoot and long-time fluctuation are often generated, so that the phenomenon of uneven water distribution of the filter tank can be caused, and the problems of untimely washing of filter materials, hardening of the filter materials, penetration of the filter material layer and the like can occur in a long time.
Disclosure of Invention
The invention aims to provide a water quantity balancing method for an upward flow filter tank, which is easy to adjust the water inflow of each filter tank, avoids the phenomenon that a filter material layer is hydraulically penetrated due to overlarge filtering speed of a filter tank body, can effectively reduce the opening frequency of an adjusting valve, prolongs the service life of the adjusting valve, and avoids the problem of feedback lag of the traditional method.
In order to achieve the above object, the present invention provides a method for balancing water amount in an upward flow filter, wherein the upward flow filter comprises a plurality of filter bodies, the filter bodies are separated by a filter material layer to form a mutually communicated filtered area and a to-be-filtered area located below the filtered area, and a regulating valve is installed at a water inlet of each filter body, and the method is characterized by comprising a self-adaptive regulating step, wherein the self-adaptive regulating step comprises:
S1, obtaining a pressure value F at the water inlet of each filter body;
S2, marking the pressure grade of each filter body as follows according to the pressure value at the water inlet of each filter body: 1. 2, …, k, …, n-1, n, wherein, F1＞F2…＞Fk＞…＞Fn－1＞FnK and n are positive integers;
S3, adjusting the opening degree V of each adjusting valve to ensure that V1＜V2…＜Vk＜…＜Vn－1＜Vn；
S4, returning to S1 for circulation.
Preferably, step S3 specifically includes:
Will V1adjusted to a preset value VminWill Vnadjusted to a preset value VmaxWill VkAccording to Vk＝VminAdjusting by + (k-1) x d,
Wherein, Vmax＞VminD is the opening degree regulating amplitude, and d is more than 0 and less than 1.
Preferably, VminAnd VmaxThe value range is as follows: v is more than or equal to 30 percentmin＜Vmax≤80％。
Preferably, the value range of the opening degree adjustment amplitude d is as follows: d is more than or equal to 1 percent and less than or equal to 5 percent.
Preferably, the cycle period of the self-adaptive adjusting step is 1 min-10 min.
preferably, the method for balancing the water quantity of the upward flow filter further comprises a back flushing adjusting step, and the back flushing adjusting step comprises the following steps:
obtaining the pressure value of each filtered area and the pressure value of the water inlet of each filter body, and subtracting the obtained pressure value of each filtered area and the obtained pressure value of the water inlet of each filter body to obtain the filtering pressure difference of each filter body;
Acquiring the installation heights of a pressure detection device for detecting the pressure of each filtered area and a pressure detection device for detecting the pressure at the water inlet of each filter tank body, and acquiring the height difference of each filter tank body by making a difference between the installation heights of the pressure detection device for detecting the pressure of each filtered area and the installation heights of the pressure detection devices for detecting the pressure at the water inlet of each filter tank body;
Respectively subtracting the filtering pressure difference and the elevation difference of each filter body to obtain the head loss of each filter body;
And when the head loss of the filter body reaches a preset maximum threshold value, backwashing the filter body.
Preferably, the method also comprises the following steps after the filter body is subjected to back washing:
The opening degree of an adjusting valve corresponding to the filter tank body for back washing is adjusted to be more than or equal to Vmin。
Preferably, the method further comprises the following steps before the step of adjusting the cycle:
adjusting the opening degree of the adjusting valve to an initial opening degree according to the flow characteristic coefficient of the adjusting valve, the type of the adjusting valve and a preset relation table;
Wherein, the relation table records the corresponding relation between the flow characteristic coefficient of at least one regulating valve and the initial opening of the regulating valve.
Preferably, the flow characteristic coefficient of the regulating valve is obtained by:
obtaining the average filtering flow of each filter body according to the quotient of the total water inflow of the upward flow filter and the number of the filter bodies;
And obtaining the flow characteristic coefficient by dividing the average filtering flow by the maximum flow of the regulating valve.
Compared with the prior art, the water quantity balancing method of the upward flow filter tank has the beneficial effects that:
According to the water quantity balancing method of the upward flow filter tank, the opening degree of the regulating valve at the water inlet corresponding to the filter tank body with the largest detected pressure value is regulated to be the smallest, the opening degree of the regulating valve at the water inlet corresponding to the filter tank body with the smallest detected pressure value is regulated to be the largest, the valve opening degrees of the water inlets of other filter tank bodies are regulated to be sequentially increased according to the sequence of the pressures from large to small, and real-time monitoring and valve opening degree regulation are circularly carried out, so that the phenomenon that a filter material layer is damaged due to overlarge bearing pressure of the filter material layer is avoided, and meanwhile, the phenomenon that the filter material layer is exposed and dried due to insufficient water quantity in the filter tank body is avoided; furthermore, the water quantity equalization method of the upward flow filter tank adopts the pressure value to replace the traditional liquid level value as the judgment basis for changing the opening degree of the regulating valve, the feedback of the adopted pressure value is more direct, rapid and accurate, simultaneously, the control system is simplified, and the investment cost is reduced.
drawings
Fig. 1 is a plan view of an upward flow filter according to an embodiment of the present invention.
FIG. 2 is a sectional view of an upward flow filter according to an embodiment of the present invention.
fig. 3 is a flow chart of a method for equalizing the water quantity in the upward flow filter according to an embodiment of the present invention.
fig. 4 is a diagram showing a correspondence relationship between the flow characteristic coefficient, the type of the regulator valve, and the opening degree of the regulator valve in the embodiment of the present invention.
In the figure: 1. the filter comprises a filter chamber, 2, a filter material layer, 3, a first pressure detection device, 4, a regulating valve, 5, an automatic control system, 6, a water inlet main pipe, 7, a water inlet branch pipe, 8, a second pressure detection device, 9 a water outlet channel, 10, an overflow wall, 11 and a water outlet pipe.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1 to 2, an upward flow filter according to a preferred embodiment of the present invention includes a filter 1, a water inlet main pipe 6 and an automatic control system 5, the filter 1 includes a plurality of filter bodies, each filter body has a filter material layer 2 therein, the filter material layer 2 separates the filter bodies into a filtered region and a region to be filtered which is located below the filtered region and is communicated with the filtered region, each region to be filtered has a water inlet connected to the water inlet main pipe 6, each water inlet has a regulating valve 4, each filtered region has a first pressure detecting device 3 therein, and the regulating valve 4 and the first pressure detecting device 3 are electrically connected to the automatic control system 5.
be equipped with first pressure measurement 3 in a plurality of filtered areas respectively, and first pressure measurement 3 and set up in the adjusting valve 4 of each water inlet all with automatic control system 5 electricity connection, when first pressure measurement 3 detected the pressure in the filtered area and exceeded the setting value, can treat the adjusting valve 4 of filtered area water inlet department through the filter body that automatic control system 5 adjustment corresponds, thereby ensure that the pressure value that filter bed 2 bore can not be too big, protect filter bed 2 of this filter 1, adopt pressure value control to replace traditional liquid level value control, the feedback is more direct under the comparison, and is quick and accurate, control system has been simplified simultaneously, investment cost is reduced.
In this embodiment, the opening degree of the adjusting valve 4 in the initial state is determined by combining the characteristic curves of the valve and the flow, so that the opening degree of the valve is in a reasonable range, and the minimum value and the maximum value of the opening degree of the valve are continuously corrected in the actual operation process, so that the filter material layer 2 is protected. Meanwhile, frequent opening and closing of the valve caused by water inflow fluctuation of the upflow filter can be effectively prevented, and the phenomenon that the water quality of the effluent cannot be guaranteed due to variable water level filtration at the water inflow initial stage of the upflow filter can be avoided.
Furthermore, the first pressure detection device 3 is positioned 80-120 mm above the filter material layer 2, so that the detection data are more accurate, the measured value of the first pressure detection device is closer to the pressure value of the filter material layer 2, frequent opening and closing of the adjusting valve 4 caused by too low installation height of the first pressure detection device 3 are avoided, and meanwhile, the problems that the response is too slow and the filter material layer 2 is damaged due to too high installation height of the first pressure detection device 3 and the opening and closing of the adjusting valve 4 are not timely are avoided.
Preferably, the water inlets are connected with the water inlet main pipe 6 through a water inlet branch pipe 7, so that water to be filtered in the water inlet main pipe 6 can flow into the corresponding filter chamber bodies through the water inlet branch pipe 7, and the adjusting valves 4 are arranged on the water inlet branch pipes 7, so that the water quantity entering each filter chamber body through the water inlet branch pipes 7 can be adjusted.
In this embodiment, still be equipped with second pressure measurement on the branch pipe 7 of intaking, second pressure measurement 8 is located between adjusting valve 4 and the water inlet, and second pressure measurement 8 is connected with automatic control system 5 electricity, can detect the pressure of each branch pipe 7 department of intaking from this, has further ensured that the rivers pressure that gets into each filtering pond originally internal can not too big, ensures that the filter bed 2 can not receive the harm.
Preferably, the first pressure detection device 3 and the second pressure detection device 8 are both pressure transmitters. Pressure transmitters are primarily comprised of a load cell sensor (also known as a pressure sensor), measurement circuitry, and process connections. It can convert the physical pressure parameters of gas, liquid, etc. sensed by the load cell sensor into standard electric signals (such as 4-20 mADC, etc.) for secondary instruments such as indication alarm, recorder, regulator, etc. to measure, indicate and regulate the process.
In addition, the water outlet channel 9 is further included, the water outlet channel 9 is arranged at one side of the filtered areas, the water outlet channel 9 converges the filtered water in each filtered area together, so that the filtered water is convenient to convey, and an overflow wall 10 is arranged between the filtered areas and the water outlet channel 9. Specifically, the device further comprises a water outlet pipe 11, and the water outlet channel 9 is communicated with the water outlet pipe 11, so that the filtered water is conveniently guided to a lower-level treatment unit.
preferably, the regulating valve 4 is a pneumatic butterfly valve which has the advantages of simple structure, small volume, light weight, low manufacturing cost, convenient control and operation and capability of regulating flow media.
As shown in fig. 3, in a method for adjusting the water quantity balance of the upward flow filter according to the preferred embodiment of the present invention, the upward flow filter includes a plurality of filter bodies, the filter bodies are partitioned by filter material layers to form a filtered area and a to-be-filtered area, the filtered area is communicated with the filtered area, and a water inlet of each filter body is provided with an adjusting valve, and the method includes a self-adaptive adjusting step, and the self-adaptive adjusting step includes:
s1, obtaining a pressure value F at the water inlet of each filter body;
S2, marking the pressure grades of the filter bodies as follows according to the pressure values at the water inlets of the filter bodies: 1. 2, …, k, …, n-1, n, wherein, F1＞F2…＞Fk＞…＞Fn－1＞FnK and n are positive integers;
S3, adjusting the opening degree V of each adjusting valve to ensure that V1＜V2…＜Vk＜…＜Vn－1＜Vn；
s4, returning to S1 for circulation.
based on the technical scheme, the opening degree of the regulating valve at the water inlet corresponding to the filter body with the largest detection pressure value is regulated to be minimum, the opening degree of the regulating valve at the water inlet corresponding to the filter body with the smallest detection pressure value is regulated to be maximum, the valve opening degrees of the water inlets of other filter bodies are regulated to be sequentially increased according to the sequence of the pressures from large to small, and real-time monitoring and valve opening degree regulation are circularly carried out, so that the filter material layer is prevented from being damaged due to overlarge bearing pressure, and meanwhile, the condition that the filter material layer is exposed and dried due to insufficient water in the filter body is avoided; furthermore, the water quantity equalization method of the upward flow filter tank adopts the pressure value to replace the traditional liquid level value as the judgment basis for changing the opening degree of the regulating valve, the feedback of the adopted pressure value is more direct, rapid and accurate, simultaneously, the control system is simplified, and the investment cost is reduced.
Further, step S3 specifically includes:
Adjusting V1 to a preset value VminWill VnAdjusted to a preset value VmaxWill VkAccording to Vk＝VminAdjusting by + (k-1) x d,
Wherein, Vmax＞VminD is the opening degree regulating amplitude, and d is more than 0 and less than 1.
The opening degree of the regulating valve corresponding to the filter tank body with the maximum measured pressure value is changed into VminThe opening of the regulating valve corresponding to the filter tank body with the minimum pressure value is changed into Vmaxthe opening of the regulating valve at the water inlet of the filter body is calculated and adjusted according to the arithmetic progression relation, the flow distributed by each filter can be more uniform by introducing the arithmetic progression, the phenomena of non-uniform water distribution and filter penetration are effectively avoided, and the filtering method is more reasonable.
Preferably, VminAnd VmaxThe value range is as follows: v is more than or equal to 30 percentmin＜Vmaxthe opening of the adjusting valve is less than or equal to 80 percent, the damage to the adjusting valve caused by the over-small or over-large opening of the adjusting valve is avoided, and the service life of the adjusting valve is prolonged.
Specifically, the value range of the opening degree adjustment amplitude d is as follows: d is more than or equal to 1 percent and less than or equal to 5 percent.
In addition, the cycle period of the self-adaptive adjusting step is 1 min-10 min, so that the service life of the adjusting valve is prevented from being shortened due to too short cycle detection time, and the filter material layer can be prevented from being damaged due to too long detection interval and untimely feedback.
Preferably, the method for balancing the water quantity of the upward flow filter further comprises a back flushing adjusting step, and the back flushing adjusting step comprises the following steps:
Acquiring pressure values of the filtered areas and pressure values at the water inlets of the filter bodies, and subtracting the acquired pressure values of the filtered areas and the pressure values at the water inlets of the filter bodies to acquire filtering pressure differences of the filter bodies;
acquiring the installation heights of a pressure detection device for detecting the pressure of each filtered area and a pressure detection device for detecting the pressure at the water inlet of each filter body, and acquiring the height difference of each filter body by making a difference between the installation heights of the pressure detection device for detecting the pressure of each filtered area and the installation heights of the pressure detection devices for detecting the pressure at the water inlet of each filter body;
Respectively differentiating the filtering pressure difference and the elevation difference of each filter body to obtain the head loss of each filter body;
And when the head loss of the filter body reaches a preset maximum threshold value, backwashing the filter body.
Acquiring the pressure value at the water inlet of each filter body which is not subjected to backwashing; according to the pressure value at the water inlet of each filter body which is not subjected to backwashing, the pressure grades of the filter bodies which are not subjected to backwashing are respectively marked as follows: 1. 2, …, k, …, n-1, n, wherein, F1＞F2…＞Fk＞…＞Fn－1＞FnK and n are positive integers; adjusting the opening degree V of each adjusting valve to ensure that V is1＜V2…＜Vk＜…＜Vn－1＜Vn(ii) a Adjusting V1 to a preset value VminWill Vnadjusted to a preset value Vmaxwill VkAccording to Vk＝Vminand (k-1) x d, adjusting the opening degree of the regulating valve at the water inlet of each filter body which is not subjected to backwashing again, and ensuring that the water inflow of each filter body which is not subjected to backwashing is uniformly distributed, so that the water quantity is ensured to be balanced, and further the regulating valve and a filter material layer are ensured not to be damaged due to temporary change of the water flow.
Specifically, the method also comprises the following steps after the filter body is back washed:
The opening degree of an adjusting valve corresponding to the filter tank body for back washing is adjusted to be more than or equal to Vmin. After the back washing of the filter body is finished, the filter material layer is cleaned thoroughly, the head loss of the filter material layer is very small, and the opening degree of the regulating valve at the water inlet of the filter body after the back washing is properly adjusted to be smaller but not lower than V before the next operation of adjusting the opening degree of the regulating valvemin。
and in the next circulation adjustment process, the backwashing filter body is added with the pressure value detection circulation again.
In this embodiment, the method further comprises the following steps before the step of adjusting the cycle:
Adjusting the opening degree of the adjusting valve to the initial opening degree according to the flow characteristic coefficient of the adjusting valve, the type of the adjusting valve and a preset relation table;
Wherein, the relationship table records the corresponding relationship between the flow characteristic coefficient of at least one regulating valve and the initial opening of the regulating valve, as shown in fig. 4.
The opening degree of the regulating valve in the initial state is determined by combining the characteristic curve of the regulating valve and the flow, so that the reasonable opening degree range of the regulating valve is favorably determined, and the condition that the regulating valve is damaged by too large or too small water flow is avoided.
specifically, the flow characteristic coefficient of the regulating valve is obtained by the following steps:
obtaining the average filtering flow of each filter body according to the quotient of the total water inflow of the upward flow filter and the number of the filter bodies;
And obtaining a flow characteristic coefficient by quoting the average filtering flow and the maximum flow of the regulating valve.
In this embodiment, the pressure value detection device for obtaining the pressure value in the filtered area is installed at the position 80-120 mm above the filter material layer. Therefore, the detection data are more accurate, frequent opening and closing of the regulating valve caused by too low mounting height are avoided, too low mounting height is also avoided, too slow response is caused, and damage to a filter material layer caused by untimely opening and closing of the regulating valve is avoided.
The working process of the invention is as follows: obtaining the average filtering flow of each filter body according to the quotient of the total water inflow of the upward flow filter and the number of the filter bodies; and obtaining a flow characteristic coefficient by quoting the average filtering flow and the maximum flow of the regulating valve. Adjusting the opening degree of the adjusting valve to the initial opening degree according to the flow characteristic coefficient of the adjusting valve, the type of the adjusting valve and a preset relation table; acquiring a pressure value F at a water inlet of each filter body; according to the pressure value at the water inlet of each filter body, the pressure grade of each filter body is marked as follows: 1. 2, …, k, …, n-1, n, wherein, F1＞F2…＞Fk＞…＞Fn－1＞Fnk and n are positive integers; adjusting the opening degree V of each adjusting valve to ensure that V is1＜V2…＜Vk＜…＜Vn－1＜Vn(ii) a Will V1adjusted to a preset value Vminwill Vnadjusted to a preset value VmaxWill VkAccording to Vk＝VminB + (k-1). times.d, wherein Vmax＞VminD is the opening degree adjusting range, and d is more than or equal to 1% and less than or equal to 5%. And (4) repeatedly carrying out pressure detection, sequencing and adjusting the opening of the regulating valve at a time interval of 1-10 min. Acquiring pressure values of the filtered areas and pressure values at the water inlets of the filter bodies, and subtracting the acquired pressure values of the filtered areas and the pressure values at the water inlets of the filter bodies to acquire filtering pressure differences of the filter bodies; acquiring the installation heights of a pressure detection device for detecting the pressure of each filtered area and a pressure detection device for detecting the pressure at the water inlet of each filter body, and acquiring the height difference of each filter body by making a difference between the installation heights of the pressure detection device for detecting the pressure of each filtered area and the installation heights of the pressure detection devices for detecting the pressure at the water inlet of each filter body; respectively differentiating the filtering pressure difference and the elevation difference of each filter body to obtain the head loss of each filter body; when calculating the head loss, the elevation difference and the filtration pressure difference are unified in unit, wherein the conversion relationship is as follows: 0.1 MPa-10 m; when the head loss of the filter body reaches a preset maximum threshold value, performing backwashing on the filter body; and when the head loss of the filter body reaches a preset maximum threshold value, backwashing the filter body. Closing the regulating valve corresponding to the filter body for backwashing, then backwashing by using equipment, detecting pressure values at the regulating valves at the water inlets of other filter bodies except the filter body for backwashing, sequencing according to the pressure values according to the method, and changing the valve opening corresponding to the filter body with the largest measured pressure value into VminThe opening of the valve corresponding to the filter tank with the minimum pressure value is changed into Vmaxand the opening degrees of other valves are adjusted according to the arithmetic progression. After the backwashing filter body finishes backwashing, the regulating valve at the water inlet of the backwashing filter body is re-opened, the opening degree of the regulating valve is properly reduced to be not less than VminWhen the next cycle is performedAnd during ring adjustment, the backwashing filter body is subjected to pressure detection and sequencing again.
To sum up, the embodiment of the present invention provides a method for balancing the water amount in an upward flow filter tank, which adjusts the opening of the regulating valve at the water inlet corresponding to the filter tank body with the largest detected pressure value to the smallest, adjusts the opening of the regulating valve at the water inlet corresponding to the filter tank body with the smallest detected pressure to the largest, adjusts the valve openings at the water inlets of the other filter tank bodies according to the sequence of the pressures from the largest to the smallest to sequentially increase, and circularly performs real-time monitoring and valve opening adjustment, thereby avoiding the damage of the filter material layer caused by the overlarge pressure borne by the filter material layer, and avoiding the occurrence of the exposed dry-out condition of the filter material layer caused by the insufficient water amount in the filter tank body; furthermore, the water quantity equalization method of the upward flow filter tank adopts the pressure value to replace the traditional liquid level value as the judgment basis for changing the opening degree of the regulating valve, the feedback of the adopted pressure value is more direct, rapid and accurate, simultaneously, the control system is simplified, and the investment cost is reduced.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "left", "right", "top", "bottom", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.
Claims (9)
1. The upward flow filter tank comprises a plurality of filter tank bodies, the filter tank bodies are separated by a filter material layer to form a mutually communicated filtered area and a to-be-filtered area positioned below the filtered area, and a regulating valve is installed at a water inlet of each filter tank body, and the method is characterized by comprising a self-adaptive regulating step which comprises the following steps:
S1, obtaining a pressure value F at the water inlet of each filter body;
S2, marking the pressure grade of each filter body as follows according to the pressure value at the water inlet of each filter body: 1. 2, …, k, …, n-1, n, wherein, F1＞F2…＞Fk＞…＞Fn－1＞Fnk and n are positive integers;
S3, adjusting the opening degree V of each adjusting valve to ensure that V1＜V2…＜Vk＜…＜Vn－1＜Vn；
s4, returning to S1 for circulation.
2. The method for equalizing the water volume in an upward flow filter according to claim 1, wherein step S3 specifically comprises:
will V1Adjusted to a preset value Vminwill VnAdjusted to a preset value VmaxWill VkAccording to Vk＝VminAdjusting by + (k-1) x d,
wherein, Vmax＞VminD is the opening degree regulating amplitude, and d is more than 0 and less than 1.
3. a method of water equalization in an upflow filter as in claim 2, wherein V isminAnd VmaxThe value range is as follows: v is more than or equal to 30 percentmin＜Vmax≤80％。
4. The method for balancing the water quantity in the upward flow filter tank according to claim 2, wherein the range of the opening degree adjustment amplitude d is as follows: d is more than or equal to 1 percent and less than or equal to 5 percent.
5. The method for equalizing the water volume in the upflow filter tank according to claim 1, wherein the cycle period of the adaptive adjusting step is 1min to 10 min.
6. the method for water quantity equalization in an upflow filter tank as claimed in claim 1, wherein the method for water quantity equalization in an upflow filter tank further comprises a back flush adjusting step, and the back flush adjusting step comprises:
Obtaining the pressure value of each filtered area and the pressure value of the water inlet of each filter body, and subtracting the obtained pressure value of each filtered area and the obtained pressure value of the water inlet of each filter body to obtain the filtering pressure difference of each filter body;
Acquiring the installation heights of a pressure detection device for detecting the pressure of each filtered area and a pressure detection device for detecting the pressure at the water inlet of each filter tank body, and acquiring the height difference of each filter tank body by making a difference between the installation heights of the pressure detection device for detecting the pressure of each filtered area and the installation heights of the pressure detection devices for detecting the pressure at the water inlet of each filter tank body;
respectively subtracting the filtering pressure difference and the elevation difference of each filter body to obtain the head loss of each filter body;
and when the head loss of the filter body reaches a preset maximum threshold value, backwashing the filter body.
7. A method for balancing the water volume in an upward flow filter according to claim 6, wherein the method further comprises the following steps after the back washing of the filter body:
The opening degree of an adjusting valve corresponding to the filter tank body for back washing is adjusted to be more than or equal to Vmin。
8. The method of water equalization in an upflow filter basin as in claim 1, further comprising, prior to the step of adjusting the cycle, the steps of:
Adjusting the opening degree of the adjusting valve to an initial opening degree according to the flow characteristic coefficient of the adjusting valve, the type of the adjusting valve and a preset relation table;
Wherein, the relation table records the corresponding relation between the flow characteristic coefficient of at least one regulating valve and the initial opening of the regulating valve.
9. The method for equalizing the water volume in an upflow filter according to claim 8, wherein the flow characteristic coefficient of the regulating valve is obtained by:
Obtaining the average filtering flow of each filter body according to the quotient of the total water inflow of the upward flow filter and the number of the filter bodies;
And obtaining the flow characteristic coefficient by dividing the average filtering flow by the maximum flow of the regulating valve.
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| CN201910771134.6A Active CN110559703B (en) | 2019-08-22 | 2019-08-22 | Water quantity balancing method for upward flow filter |
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