CN107774018B

CN107774018B - Sand discharge method and sand discharge system for cyclone sand basin

Info

Publication number: CN107774018B
Application number: CN201711014295.8A
Authority: CN
Inventors: 孙玉辉; 赵贤林; 高心宇; 汪凯
Original assignee: Huatian Engineering and Technology Corp MCC
Current assignee: MCC Ecological Environmental Protection Group Co.,Ltd.
Priority date: 2017-10-25
Filing date: 2017-10-25
Publication date: 2020-04-21
Anticipated expiration: 2037-10-25
Also published as: CN107774018A

Abstract

The invention provides a sand discharge system and a sand discharge method for a rotational flow grit chamber, which comprise a plurality of sensors, at least one early warning line, a data acquisition unit, a signal transmission unit, a control unit and a control execution unit, wherein: the early warning lines are arranged on the side wall of a sand hopper of the rotational flow grit chamber, and the different early warning lines have different heights from the bottom of the sand hopper; the sensor is arranged on the side wall of the sand hopper and used for measuring the distance between the sand in the sand hopper and the early warning line; the data acquisition unit acquires data measured by the sensor and transmits the data to the control unit through the signal transmission unit, the control unit sets a sand discharge condition, the sand discharge condition is that the number of the sand hopper sand and the early warning line, which are less than a safety threshold value, reaches a set number, and when the sand discharge condition is achieved, the control unit sends an instruction to the control execution unit to discharge sand. The system and the method have the advantages of automatic sand discharge, convenience, rapidness and high reliability.

Description

Sand discharge method and sand discharge system for cyclone sand basin

Technical Field

The invention relates to the technical field of sand discharge of a grit chamber in sewage treatment, in particular to a sand discharge method and a sand discharge system of a rotational flow grit chamber.

Background

The sewage is inevitably mixed into the silt in the migration, flow and collection processes. If the sand in the sewage is not removed by settlement separation in advance, the operation of subsequent treatment equipment can be influenced. The most important is to abrade the pump, block the pipe network, and interfere or even destroy the biochemical treatment process. The grit chamber is mainly used for removing sand grains with the grain diameter of more than 0.2mm and the density of more than 2.65 t/cubic meter in sewage so as to protect pipelines, valves and other facilities from abrasion and blockage.

At present, the grit chamber of the municipal sewage treatment plant basically adopts two types: one is an aeration grit chamber which is widely applied, aeration is controlled by an air pipe at one side in the chamber, so that sewage forms a forward rotational flow (vertical to the water flow direction) with a certain speed, and the tank type has a stable desanding effect; the other type is a rotational flow grit chamber for removing sand by utilizing hydraulic rotational flow (the rotational flow is basically consistent with the water flow direction), has the advantages of simple chamber type, land occupation saving, low operation cost, good sand removing effect and the like, and has received more and more attention from people. This patent is mainly studied to whirl grit chamber. The sand discharge of the cyclone grit chamber adopts two forms at present, one is sand discharge by a sand pump, and the cyclone grit chamber has the advantages of less equipment and simple and convenient operation, but the abrasion problem of the sand pump is more and more concerned by users; the other is air stripping sand discharge, which has the advantages that the system is reliable and durable, but the equipment is relatively more.

However, in the current sewage treatment process, the sand amount of the grit chamber is not monitored and discharged, and generally, an operator performs sand discharge operation at intervals according to past experience. Because there is the change in different time quantums sewage volume, sewage concentration, if can not be accurate know the sand setting volume and in time arrange the sand, cause very easily to block even the grit spills over and influence the normal processing of sewage.

Disclosure of Invention

The invention is made to solve the technical problems in the prior art, and aims to provide a sand discharge method and a sand discharge system for a cyclone grit chamber, which are convenient, fast and high in reliability.

According to one aspect of the invention, a sand discharge system of a rotational flow grit chamber is provided, which is used for sand discharge of the rotational flow grit chamber and comprises a plurality of sensors, at least one early warning line, a data acquisition unit, a signal transmission unit, a control unit and a control execution unit, wherein: the early warning lines are arranged on the side wall of a sand hopper of the rotational flow grit chamber, and the different early warning lines have different heights from the bottom of the sand hopper; the sensor is arranged on the side wall of the sand hopper and used for measuring the distance between the sand in the sand hopper and the early warning line; the data acquisition unit acquires data measured by the sensor and transmits the data to the control unit through the signal transmission unit, the control unit sets a sand discharge condition, the sand discharge condition is that the number of the sand hopper sand and the early warning line, which are less than a safety threshold value, reaches a set number, and when the sand discharge condition is achieved, the control unit sends an instruction to the control execution unit to discharge sand.

According to another aspect of the invention, a sand discharge method for a cyclone sand basin is provided, which is used for sand discharge of the cyclone sand basin and comprises the following steps: arranging at least one early warning line on the side wall of a sand hopper of the rotational flow grit chamber, wherein the different early warning lines have different heights from the bottom of the sand hopper; a plurality of sensors are arranged on the side wall of a sand hopper of the rotational flow grit chamber and used for measuring the distance between sand stones in the sand hopper and the early warning line; judging whether a sand discharge condition is met or not according to the distance sensed by the sensor, wherein the quantity of the sand hopper and the early warning line in the sand discharge condition, which is smaller than the safety threshold value, reaches a set quantity; and if the sand discharge condition is met, carrying out sand discharge.

According to the rotational flow grit chamber sand discharge system and method, the original operation of periodically discharging sand manually by experience is changed into the operation of monitoring the sand amount in real time by the rotational flow grit chamber sand discharge system, and the sand amount is automatically discharged by comparing with the set sand discharge condition, so that the blank of automatically discharging sand in the current rotational flow grit chamber is filled, the timeliness and the initiative of the system are improved, and the risk of sand accumulation is reduced.

In addition, because the operator only needs to pay attention to the control module, observation and sand discharge are not needed, the operator is liberated, the productivity and the working efficiency are improved, and the cost of sewage treatment is reduced for a long time.

Moreover, the sand discharge system and the sand discharge method of the rotational flow grit chamber are not only applicable to a certain sewage plant, can be continuously optimized and perfected in production, have good effects and have popularization significance.

Drawings

Other objects and results of the present invention will be more apparent and readily appreciated by reference to the following detailed description taken in conjunction with the accompanying drawings. In the drawings:

FIG. 1 is a schematic view of a sand discharge system of a cyclone grit chamber according to the present invention;

FIG. 2 is a flow chart of a sand discharge method of the cyclone sand basin according to the invention;

FIG. 3 is a flow chart of a preferred embodiment of the sand discharging method of the cyclone sand basin according to the invention.

Detailed Description

In the following description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of one or more embodiments. It may be evident, however, that such embodiment(s) may be practiced without these specific details.

Various embodiments according to the present invention will be described in detail below with reference to the accompanying drawings.

Fig. 1 is a schematic diagram of a sand discharge system of a cyclone sand basin according to the present invention, and as shown in fig. 1, the sand discharge system of a cyclone sand basin is used for sand discharge of the cyclone sand basin, and is characterized by comprising a plurality of sensors 10, at least one early warning line 20, a data acquisition unit 30, a signal transmission unit 40, a control unit 50, and a control execution unit 60, wherein:

the early warning lines 20 are arranged on the side wall of the sand hopper 1 of the rotational flow grit chamber, and the different early warning lines 20 have different heights from the bottom of the sand hopper;

the sensor 10 is arranged on the side wall of the sand hopper and used for measuring the distance between sand stones in the sand hopper and the early warning line;

the data acquisition unit 30 acquires data measured by the sensor and transmits the data to the control unit 50 through the signal transmission unit 40, the control unit 50 sets a sand discharge condition, the sand discharge condition is that the number of sand stones of the sand hopper and the early warning line, which are separated by a distance smaller than a safety threshold value, reaches a set number, when the sand discharge condition is achieved, the control unit 50 sends an instruction to the control execution unit 60 to discharge sand, preferably, the set number of the early warning lines with different heights in the sand discharge condition is different, and the set number is reduced along with the increase of the height.

In a preferred embodiment of the present invention, the sand discharge system of the cyclone sand basin further includes an optimization unit, which optimizes the height of the early warning line and the sand discharge condition according to the accumulation of the measured data of the sensor.

In order to prevent sand from damaging the sensor, the sensor is preferably arranged above the warning line, and the sand is discharged when the distance from the warning line is less than a safety threshold value, so that the sensor above the warning line is not damaged.

Fig. 2 is a flow chart of the sand discharge method of the cyclone grit chamber according to the present invention, and as shown in fig. 2, the sand discharge method of the cyclone grit chamber includes:

step 1, arranging at least one early warning line on the side wall of a sand hopper of the rotational flow grit chamber, wherein the different early warning lines have different heights from the bottom of the sand hopper;

step 2, arranging a plurality of sensors on the side wall of a sand hopper of the rotational flow grit chamber, and measuring the distance between sand stones in the sand hopper and the early warning line;

step 3, judging whether a sand discharge condition is met or not according to the distance sensed by the sensor, wherein the sand discharge condition is that the number of the sand in the sand hopper, the sand of which the distance is less than the safety threshold value, reaches a set number;

and 4, if the sand discharge condition is met, performing sand discharge.

In a preferred embodiment of the present invention, the sand discharging method for a cyclone sand basin further comprises:

setting different sand discharge conditions for the early warning lines with different heights, wherein the set number in the different sand discharge conditions is different, and the set number is reduced along with the increase of the heights;

and optimizing the height of the early warning line and the sand discharge condition according to the accumulation of the measurement data of the sensor.

In an embodiment of the present invention, as shown in fig. 3, the sand discharging method for a cyclone grit chamber includes:

two parallel and spaced sand

content warning lines

21 and 22 are arranged in the sand hopper, the height of the warning lines from the pool bottom is recorded as H1 and H2, and H2 is greater than H1.

Arranging N (N >3) sensors around the sand hopper of the cyclone grit chamber, wherein the sensors are used for measuring the distance between the sand in the sand hopper and two preset early warning lines, the distance between the sand in the sand hopper and the early warning line 21 is recorded as Mi, the distance between the sand in the sand hopper and the early warning line 22 is recorded as Ni, i is 1,2,3.

Set up grit in the control unit apart from the safe threshold value L of early warning line, still set up:

the sand discharge method comprises the following steps that a first sand discharge condition is adopted, when m data values in Mi (i is 1,2,3.. N) are smaller than a safety threshold L, sand discharge operation is started, the value of m can be preliminarily set according to actual conditions, and optimization adjustment is carried out according to accumulation of measured data of a sensor;

under a second sand discharge condition, when N data values in Ni (i is 1,2,3.. N) are smaller than a safety threshold L, sand discharge operation is started, wherein m is larger than N, the value of N can be preliminarily set according to actual conditions, and then optimization adjustment is carried out according to accumulation of measured data of the sensor;

the adjustment and optimization of the early warning line heights H1 and H2 and m and n can be realized by firstly specifying the numerical values in the early stage, analyzing the data by the control unit along with the accumulation of the past data in the later stage, and then optimizing the method by adjusting the data values to observe the actual effect so as to find the most appropriate sand discharge condition.

The sand discharge system and the sand discharge method for the rotational flow grit chamber can automatically and accurately discharge sand, the heights of all the early warning lines are not completely the same, the nonuniformity of the early warning lines is corrected through the multiple early warning lines, and the multiple early warning lines can adapt to different sewage concentrations to prevent sand blocking and sand overflow.

While the foregoing disclosure shows illustrative embodiments of the invention, it should be noted that various changes and modifications could be made herein without departing from the scope of the invention as defined by the appended claims. Furthermore, although elements of the invention may be described or claimed in the singular, the plural is contemplated unless limitation to a single element is explicitly stated.

Claims

1. The utility model provides a whirl grit chamber sand discharge system for the sand discharge of whirl grit chamber, its characterized in that includes a plurality of sensors, an at least early warning line, data acquisition unit, signal transmission unit, the control unit and control execution unit, wherein:

the early warning lines are arranged on the side wall of a sand hopper of the rotational flow grit chamber, and the different early warning lines have different heights from the bottom of the sand hopper;

the sensor is arranged on the side wall of the sand hopper and used for measuring the distance between the sand in the sand hopper and each early warning line;

the data acquisition unit acquires data measured by the sensor and transmits the data to the control unit through the signal transmission unit, the control unit sets a sand discharge condition, the sand discharge condition is that the number of sensor measurement data with the distance between sand and gravel of the sand hopper and the early warning line smaller than a safety threshold reaches a set number, when the sand discharge condition is reached, the control unit sends an instruction to the control execution unit to discharge sand, wherein the set number in the sand discharge conditions of the early warning lines with different heights is different, and the set number is reduced along with the increase of the heights.

2. The sand discharge system of the cyclone sand basin as claimed in claim 1, further comprising an optimization unit for optimizing the height of the early warning line and the sand discharge condition according to the accumulation of the measured data of the sensor.

3. The sand discharge system of a rotational flow grit chamber as claimed in claim 1, which comprises two parallel pre-warning lines.

4. A sand discharge method of a rotational flow grit chamber is used for sand discharge of the rotational flow grit chamber and is characterized by comprising the following steps:

arranging at least one early warning line on the side wall of a sand hopper of the rotational flow grit chamber, wherein the different early warning lines have different heights from the bottom of the sand hopper;

a plurality of sensors are arranged on the side wall of a sand hopper of the rotational flow grit chamber and used for measuring the distance between the sand in the sand hopper and each early warning line;

judging whether a sand discharge condition is met or not according to the distance sensed by the sensor, wherein the sand discharge condition is that the quantity of sensor measurement data of which the distance between the sand of the sand hopper and the early warning line is smaller than a safety threshold value reaches a set quantity;

and if the sand discharge conditions are met, carrying out sand discharge, wherein different sand discharge conditions are set for the early warning lines with different heights, the set number in the different sand discharge conditions is different, and the set number is reduced along with the increase of the heights.

5. The sand discharge method of the cyclone grit chamber as claimed in claim 4, further comprising: