Search

CN-119118288-B - Low-solid-content sewage cyclone sand removal system and control method thereof

CN119118288BCN 119118288 BCN119118288 BCN 119118288BCN-119118288-B

Abstract

The invention belongs to the field of sewage treatment, and discloses a low-solid-content sewage cyclone sand removal system and a control method thereof, wherein the system comprises a pressure transmitter, a pressure sensor and a pressure sensor, wherein the pressure transmitter is arranged on a water supply pipe; a plurality of cyclones connected with the water inlet pipe; the cyclone sand collecting device comprises a pressure transmitter, a cyclone, a plurality of first valves, a sand collecting chamber, a sand-water separator, a controller, a parallel branch circuit, a plurality of first valves, a plurality of second valves, a plurality of third valves and a plurality of third valves, wherein the first valves are arranged on an inlet pipeline of the cyclone and are associated with the pressure transmitter, a sand collecting chamber is arranged at a first sand discharge port of the cyclone, a second valve is arranged at an outlet end of the sand collecting chamber, the sand-water separator is connected with an outlet end of the second valve, the controller is connected with the pressure transmitter, the first valves, the cyclone, the second valves and the sand-water separator, the cyclone, the first valves, the sand collecting chamber and the second valves are equal in number and are correspondingly arranged on the parallel branch circuit, and the parallel branch circuit comprises more than 3. The system can automatically regulate and control the operation of the cyclone according to the fluctuation of the total inflow pressure, solves the problems of unstable operation flow state, poor sand removal effect and the like caused by fluctuation of the inflow flow, is suitable for the sand removal treatment of sewage with large fluctuation of inflow and low solid content, and has high and stable operation and good sand removal effect.

Inventors

  • XIAO BO
  • SHU FENG
  • BI YONGWEI
  • YI YANG
  • YUAN HUAJIE

Assignees

  • 中建环能科技股份有限公司

Dates

Publication Date
20260508
Application Date
20241022

Claims (10)

  1. 1. A control method of a low solid content sewage cyclone sand removal system is characterized by comprising the following steps: a pressure transmitter (1) arranged on the water supply pipe; The cyclones (4) are arranged in parallel, and an inlet pipeline at the upper part of each cyclone (4) is connected with the water inlet pipe through a pressure equalizing flow distributor (2); A plurality of first valves (3) respectively arranged on the inlet pipeline of each cyclone (4), wherein each first valve (3) is associated with the pressure transmitter (1); the first sand discharge port (41) at the lower part of each cyclone (4) is connected with the sand collection chamber (5); the outlet end of each sand collecting chamber (5) is provided with a second valve (6); the sand-water separator (7) is connected with the outlet end of each second valve (6) and is used for separating sand from concentrated sand; The controller is in telecommunication connection with the pressure transmitter (1), the first valve (3), the cyclone (4), the second valve (6) and the sand-water separator (7); The cyclone (4), the first valve (3), the sand collecting chamber (5) and the second valve (6) are equal in number and are arranged on parallel branches in a one-to-one correspondence manner, and the parallel branches comprise more than 3; the control method of the low-solid-content sewage cyclone sand removal system comprises the following steps of: S100, obtaining total inlet pressure WP1 of the water pipe, and controlling the opening/closing quantity of the first valve and the opening and closing of the corresponding cyclone according to the total inlet pressure WP 1; S200, recording accumulated opening time T1 of each first valve, wherein when the accumulated opening time T1 of any first valve is more than or equal to preset time T0, a second valve on a parallel branch where the first valve is positioned meets the condition of opening sand discharge, and when the accumulated opening time T1 of any first valve is less than preset time T0, the second valve on the parallel branch where the first valve is positioned does not meet the condition of opening sand discharge; and S300, the sand-water separator operates according to operation periods, each operation period comprises a plurality of flow links, and the second valve is opened to discharge sand only in the water inlet link of each operation period.
  2. 2. The control method of a low solids sewage cyclone sand removal system according to claim 1, wherein in step S100: When the total water inlet pressure WP1 is in a normal working pressure range P Lower limit value ~P Upper limit value , opening N first valves and corresponding cyclones thereof, wherein N is more than or equal to 2; When the total water inlet pressure WP1 is smaller than P Lower limit value , opening N - first valves and corresponding cyclones thereof, wherein N - is smaller than or equal to 1 and is smaller than N; When the total water inlet pressure WP1 is greater than P Upper limit value , N + first valves and corresponding cyclones thereof are opened, N + is greater than N, and N + is greater than or equal to 3.
  3. 3. The control method of a low solids sewage cyclone sand removal system according to claim 1, wherein in step S200: Setting all the second valves into a circulating alternate starting sequence, opening the second valves to perform underflow sand discharge when the second valves are alternately started to any second valve starting sequence and the second valves meet the starting sand discharge conditions, and automatically closing the second valves after the starting sand discharge reaches a preset sand discharge duration T Row of rows ; when any first valve is opened, starting to record the opening time of the first valve, stopping timing when the first valve is closed, recording without zero clearing, and continuing to record timing when the first valve is opened again until the accumulated opening time T1 is more than or equal to the preset time T0, and enabling the corresponding second valve to meet the condition of opening the sand discharge; And when the second valve is opened to perform underflow sand discharge, the corresponding first valve is in a closed state.
  4. 4. The method for controlling a rotational flow sand removal system for sewage with low solid content according to claim 1 or 3, wherein in step S300, the plurality of flow links of the operation cycle include an initialization link, a water inlet link, a sedimentation link, a water discharge link and a sand separation link which are sequentially arranged, the sand discharge is performed by opening the second valve only in the water inlet link of each operation cycle, then the sand-water separator performs the subsequent processing, the next operation cycle can be started after one operation cycle is finished, and if the previous operation cycle is not finished and the next second valve has met the condition of opening the sand discharge, the next second valve is delayed for waiting.
  5. 5. -A low solids sewage cyclone desanding system employing the control method as claimed in any of claims 1 to 4, wherein all the second valves (6) are associated with each other and each of the second valves (6) is associated with a first valve (3) on the same parallel branch; And/or all of the cyclones (4) are associated with the pressure transmitter (1); And/or each of said cyclones (4) is associated with said first valve (3) on the corresponding inlet line.
  6. 6. The low solid content sewage cyclone sand removal system according to claim 5, wherein all the sand collecting chambers (5) are provided with a backflushing gas branch (8), the backflushing gas branch (8) is provided with a one-way air inlet valve (81) and a flushing switch valve (82), the one-way air inlet valve (81) is arranged at the end part of the backflushing gas branch (8) and is positioned in the sand collecting chambers (5), and all the backflushing gas branch (8) are connected with an air compressor; A pressure monitor is arranged on a pipeline between the first sand discharge port (41) and the inlet of the sand collecting chamber (5), and the pressure monitor is associated with the flushing switch valve (82).
  7. 7. The low solids sewage cyclone desanding system of claim 6, wherein said one-way intake valve (81) comprises: the valve body (811) is of a cylindrical structure, one end of the valve body is a blind end, and the other end of the valve body is opened and communicated with the recoil gas branch (8); A valve core (812) which is matched with the interior of the valve body (811) and is arranged in the valve body (811) in a sliding manner along the axial direction; an elastic member (813) disposed in the valve body (811) and located between the blind end of the valve body (811) and the valve core (812); The valve body (811) is characterized in that a plurality of exhaust holes (8111) are circumferentially distributed on the side wall of the valve body, the valve core (812) is pushed to seal the exhaust holes (8111) when the elastic piece (813) is reset, and when the backflushing gas branch (8) is used for introducing pressurized gas into the sand collecting chamber (5), the pressurized gas pushes the valve core (812) to compress the elastic piece (813) so that the exhaust holes (8111) are opened.
  8. 8. The low solids sewage cyclone desanding system of claim 7, wherein said valve body (811) further comprises one or more of: A limiting part (8112) for limiting the valve core (812) is arranged in one opening end of the valve body (811), and when the valve core (812) is abutted against the limiting part (8112), the exhaust hole (8111) is blocked; A drain hole (8113) is formed in the side wall, close to the blind end, of the valve body (811); an external thread is arranged at one end of the opening of the valve body (811), and the valve body is connected with the sand collecting chamber (5) and/or the recoil gas branch (8) through a threaded joint.
  9. 9. The low solid content sewage cyclone sand removal system according to claim 5, wherein the sand-water separator (7) comprises a sand settling hopper (71) and a conveying mechanism (72), wherein the sand settling hopper (71) is provided with an overflow port (711), a water outlet (712) and an emptying port (713) from top to bottom, the conveying mechanism (72) is a spiral conveying mechanism, one end of the conveying mechanism is connected with the bottom of the sand settling hopper (71), the other end of the conveying mechanism is provided with a second sand outlet (721), and the cyclone (4) and the sand collecting chamber (5) are arranged above the sand settling hopper (71) in a vertical pipe vertically and directly connected mode.
  10. 10. The low solids wastewater cyclone sand removal system of claim 5 wherein: the first valve (3) is a pneumatic gate valve; and/or the second valve (6) is a pneumatic pipe clamp valve; and/or the pressure equalizing flow distributor (2) comprises a main water inlet pipe (21) and at least 3 branch water outlet pipes (22), wherein the flow area of the main water inlet pipe (21) is larger than or equal to the sum of the flow areas of the branch water outlet pipes (22).

Description

Low-solid-content sewage cyclone sand removal system and control method thereof Technical Field The invention belongs to the field of sewage treatment equipment, and particularly relates to a low-solid-content sewage cyclone sand removal system and a control method thereof. Background The traditional sand removing system mainly comprises a horizontal flow sand sedimentation tank, an aeration sand sedimentation tank or a rotational flow sand sedimentation tank which are mainly in the form of civil structures, all the three are required to be pumped or lifted, the problems of sand blockage and abrasion exist, and meanwhile, the three have almost no removal effect on fine sand below 200 mu m. Therefore, the applicant has developed a high-precision rotational flow sand removal equipment system (such as a sewage sand removal system disclosed in patent CN 215288245U) in the early stage, and can effectively remove fine sand below 200 mu m, but the problems of easy blockage, unstable sand removal effect and the like are found in the use process. In addition, when the sewage plant operates, the liquid level control target of the lift pump pool is mainly realized by controlling the operation number or the operation frequency of the lift pumps. However, the fluctuation of the inflow water flow in the rainy season, the dry season, the flood season and the non-flood season is large, the change coefficient of the treated water quantity can reach more than 1.5, and the large fluctuation of the inflow water flow can generate obvious impact on the operation of the cyclone. The prior art adopts a plurality of 2 cyclones to work, the water inlet of the cyclones is manually switched by adopting a manual gate, and the manual gate has larger caliber, large operation labor intensity and switching hysteresis, can not timely cope with the fluctuation of instantaneous water quantity, can cause unstable operation working conditions and internal flow fields of the cyclones, even causes the problems that the operation parameters are not in the normal working range, and the like, so that the sand removal effect is unstable. Disclosure of Invention Aiming at the defects of the prior art, the invention provides a low-solid-content sewage cyclone sand removal system and a control method thereof, and the system can automatically adjust and control the operation of a cyclone according to the fluctuation of total inflow pressure, solves the problems of unstable operation flow state, poor sand removal effect and the like caused by fluctuation of inflow flow, is suitable for the sand removal treatment of sewage with large fluctuation of inflow, and has high and stable operation and good sand removal effect. The technical scheme adopted by the invention is as follows: A low solids sewage cyclone desanding system comprising: the pressure transmitter is arranged on the water supply pipe; the cyclones are arranged in parallel, and an inlet pipeline at the upper part of each cyclone is connected with the water inlet pipe through a pressure equalizing flow distributor; the first valves are respectively arranged on the inlet pipeline of each cyclone, and each first valve is associated with the pressure transmitter; The first sand discharge port at the lower part of each cyclone is connected with one sand collecting chamber; The outlet end of each sand collecting chamber is provided with the second valve; the sand-water separator is connected with the outlet end of each second valve and is used for separating sand from concentrated sand; The controller is in telecommunication connection with the pressure transmitter, the first valve, the cyclone, the second valve and the sand-water separator; the cyclone, the first valve, the sand collecting chamber and the second valve are equal in number and are arranged on the parallel branch in a one-to-one correspondence mode, and the parallel branch comprises 3 or more than 3. In one embodiment of the application, all the second valves are associated with each other and each of the second valves is associated with a first valve on the same parallel branch; And/or all of the cyclones are associated with the pressure transmitter; And/or each of said cyclones is associated with said first valve on the corresponding inlet line. In one embodiment of the application, all the sand collecting chambers are provided with a recoil gas branch, a one-way air inlet valve and a gas flushing switch valve are arranged on the recoil gas branch, and the one-way air inlet valve is arranged at the end part of the recoil gas branch and is positioned in the sand collecting chamber; and a pressure monitor is arranged on a pipeline between the first sand discharge port and the sand collecting chamber inlet, and the pressure monitor is associated with the air charging switch valve. In one embodiment of the present application, the one-way intake valve includes: The valve body is of a cylindrical structure, one end of the valve body is a b