A desulfurized wastewater treatment system and treatment method

Abstract

The present invention discloses a desulfurized wastewater treatment system, comprising: a gypsum hydrocyclone, a vacuum belt filter, a filtrate water tank, a wastewater pre-sedimentation tank and a control module; the gypsum hydrocyclone, the vacuum belt filter, the filtrate water tank and the wastewater pre-sedimentation tank are connected by pipelines, and a first regulating valve, a second regulating valve, a third regulating valve and a wastewater feed pump are arranged on the pipelines. The control module includes a collection unit, a processing unit and a control unit. The control module is connected to the first regulating valve, the second regulating valve, the third regulating valve and the wastewater feed pump. The control module is used to control the working states of the first regulating valve, the second regulating valve, the third regulating valve and the wastewater feed pump to realize the treatment of desulfurized wastewater.

Description

Technical Field

[0001] The present invention relates to the technical field of wastewater treatment systems, and in particular to a desulfurized wastewater treatment system and a treatment method. Background Art

[0002] The power structure in China is mainly based on thermal power. Thermal power plants are also major emitters of sulfur dioxide. In order to reduce the large emissions of sulfur dioxide, most domestic coal-fired units have currently installed flue gas desulfurization devices, and the limestone-gypsum wet desulfurization process is mainly used, that is, a large amount of limestone is added into the absorption tower to absorb sulfur dioxide, and the two react to form gypsum calcium sulfate, so as to achieve the purpose of removing sulfur dioxide. At the same time, the desulfurized wastewater in the absorption tower contains a large amount of gypsum solids and needs subsequent purification and separation treatment.

[0003] The desulfurized wastewater is sequentially treated by a gypsum discharge pump, a gypsum hydrocyclone and a vacuum belt filter. The overflow slurry of the gypsum hydrocyclone enters the filtrate water tank. The vacuum belt filter uses a vacuum pump to suck the water in the slurry to form gypsum. The water in the steam-water separator of the vacuum pump enters the filtrate water tank and is pumped back to the absorption tower by a filtrate water pump, or is pumped into a wastewater pre-settling tank in the wastewater treatment system by a wastewater feed pump for wastewater treatment.

[0004] However, since the filtrate water tank contains a part of the overflow slurry on the upper layer of the gypsum hydrocyclone and is relatively turbid, after being pumped into the wastewater pre-settling tank, the water in the wastewater pre-settling tank becomes turbid and the desulfurized wastewater treatment system cannot operate continuously. It is necessary to wait until the wastewater pre-settling tank is clarified before the wastewater treatment system can be put into operation. Therefore, there is an urgent need for a desulfurized wastewater treatment system that can not only ensure the clarification of the wastewater in the wastewater pre-settling tank but also ensure the continuous operation of the desulfurized wastewater treatment system. Summary of the Invention

[0005] The purpose of the present invention is to provide a desulfurized wastewater treatment system and a treatment method to solve the problem that after the wastewater in the filtrate water tank is pumped into the wastewater pre-settling tank, the water in the wastewater pre-settling tank becomes turbid and the desulfurized wastewater treatment system cannot operate continuously.

[0006] The present invention provides a desulfurized wastewater treatment system, including: a gypsum hydrocyclone, a vacuum belt filter, a filtrate water tank, a wastewater pre-settling tank and a control module;

[0007] The bottom outlet of the gypsum hydrocyclone is connected to the inlet of the vacuum belt filter through a first pipeline, the outlet of the vacuum belt filter is connected to the inlet of the wastewater pre-settling tank through a second pipeline, the outlet of the vacuum belt filter is also connected to the inlet of the filtrate water tank through a third pipeline, and the outlet of the filtrate water tank is connected to the inlet of the wastewater pre-settling tank through a fourth pipeline;

[0008] A first regulating valve is provided on the second pipeline, a second regulating valve is provided on the third pipeline, and a third regulating valve and a waste water feed pump are provided on the fourth pipeline;

[0009] The control module is connected to the first regulating valve, the second regulating valve, the third regulating valve and the waste water feed pump, and the control module is used to control the working states of the first regulating valve, the second regulating valve, the third regulating valve and the waste water feed pump;

[0010] The control module includes a collection unit, a processing unit and a control unit. The collection unit is used to collect the state data of the filtrate water tank and the waste water pre-sedimentation tank;

[0011] The processing unit is used to set the working state instructions of the first regulating valve, the second regulating valve, the third regulating valve and the waste water feed pump according to the state data;

[0012] The control unit is used to control the first regulating valve, the second regulating valve, the third regulating valve and the waste water feed pump according to the working state instructions set by the processing unit.

[0013] In some embodiments of the present application, the vacuum belt filter press includes a vacuum pump steam-water separator, and the vacuum pump steam-water separator is used to separate the steam and water in the gypsum slurry and discharge the filtrate from the outlet of the vacuum belt filter press.

[0014] In some embodiments of the present application, the overflow port of the hydrocyclone is connected to the inlet of the filtrate water tank through a fifth pipeline.

[0015] In some embodiments of the present application, the state data includes: the liquid level of the waste water pre-sedimentation tank, the turbidity of the water quality in the waste water pre-sedimentation tank, and the turbidity of the water quality in the filtrate water tank.

[0016] In some embodiments of the present application, the collection unit includes: a liquid level gauge, which is arranged in the waste water pre-sedimentation tank and is used to detect the liquid level of the waste water pre-sedimentation tank in real time;

[0017] A first turbidity meter, which is arranged in the waste water pre-sedimentation tank and is used to detect the turbidity of the water quality in the waste water pre-sedimentation tank in real time;

[0018] A second turbidity meter, which is arranged in the filtrate water tank and is used to detect the turbidity of the water quality in the filtrate water tank in real time.

[0019] In some embodiments of the present application, the processing unit sets the working state instructions of the first regulating valve, the second regulating valve, the third regulating valve and the waste water feed pump according to the state data, including:

[0020] Determine the water quality turbidity of the wastewater pre-sedimentation tank and the liquid level of the wastewater pre-sedimentation tank, and determine the opening degrees of the first regulating valve and the second regulating valve according to the water quality turbidity of the wastewater pre-sedimentation tank and the liquid level of the wastewater pre-sedimentation tank;

[0021] Determine the water quality turbidity of the filtrate water tank, and determine the opening degrees of the third regulating valve and the working state of the wastewater feeding pump according to the water quality turbidity of the filtrate water tank.

[0022] In some embodiments of the present application, a preset wastewater pre-sedimentation tank water quality turbidity matrix Z0 is set in the processing unit, and Z0(Z1, Z2, Z3, Z4) is set, where Z1 is the first preset wastewater pre-sedimentation tank water quality turbidity, Z2 is the second preset wastewater pre-sedimentation tank water quality turbidity, Z3 is the third preset wastewater pre-sedimentation tank water quality turbidity, Z4 is the fourth preset wastewater pre-sedimentation tank water quality turbidity, and Z1 < Z2 < Z3 < Z4;

[0023] A preset wastewater pre-sedimentation tank liquid level matrix L0 is set, and L0(L1, L2, L3, L4) is set, where L1 is the first preset liquid level, L2 is the second preset liquid level, L3 is the third preset liquid level, L4 is the fourth preset liquid level, and L1 < L2 < L3 < L4;

[0024] A preset valve opening degree matrix P0 is set, and P0(P1, P2, P3, P4) is set, where P1 is the first preset valve opening degree, P2 is the second preset valve opening degree, P3 is the third preset valve opening degree, P4 is the fourth preset valve opening degree, and P1 < P2 < P3 < P4;

[0025] Obtain the water quality turbidity z of the wastewater pre-sedimentation tank and the liquid level l of the wastewater pre-sedimentation tank, and set the opening degrees of the first regulating valve and the second regulating valve according to the relationship between the water quality turbidity z of the wastewater pre-sedimentation tank and each preset wastewater pre-sedimentation tank water quality turbidity and the relationship between the liquid level l of the wastewater pre-sedimentation tank and each preset liquid level;

[0026] When z < Z1 and l < L1, set the fourth preset valve opening degree P4 as the opening degree of the first regulating valve, and set the first preset valve opening degree P1 as the opening degree of the second regulating valve;

[0027] When Z1 ≤ z < Z2 and L1 ≤ l < L2, set the third preset valve opening degree P3 as the opening degree of the first regulating valve, and set the second preset valve opening degree P2 as the opening degree of the second regulating valve;

[0028] When Z2 ≤ z < Z3 and L2 ≤ l < L3, set the second preset valve opening degree P2 as the opening degree of the first regulating valve, and set the third preset valve opening degree P3 as the opening degree of the second regulating valve;

[0029] When Z3 ≤ z < Z4 and L3 ≤ l < L4, set the first preset valve opening P1 as the opening of the first regulating valve, and set the fourth preset valve opening P4 as the opening of the second regulating valve.

[0030] In some embodiments of the present application, a preset turbidity matrix T0 of the filtrate water tank is set in the processing unit, and T0(T1, T2, T3, T4) is set, where T1 is the first preset turbidity of the filtrate water tank, T2 is the second preset turbidity of the filtrate water tank, T3 is the third preset turbidity of the filtrate water tank, T4 is the fourth preset turbidity of the filtrate water tank, and T1 < T2 < T3 < T4;

[0031] The working states of the wastewater feeding pump include an operating state and a closed state;

[0032] Obtain the turbidity t of the filtrate water tank, and set the opening of the third regulating valve and the working state of the wastewater feeding pump according to the relationship between the turbidity t of the filtrate water tank and the preset turbidities of each filtrate water tank;

[0033] When t < T1, set the third preset valve opening P3 as the opening of the third regulating valve, and set the working state of the wastewater feeding pump as the operating state;

[0034] When T1 ≤ t < T2, set the second preset valve opening P2 as the opening of the third regulating valve, and set the working state of the wastewater feeding pump as the operating state;

[0035] When T2 ≤ t < T3, set the first preset valve opening P1 as the opening of the third regulating valve, and set the working state of the wastewater feeding pump as the operating state;

[0036] When T3 ≤ t < T4, set the third regulating valve to the closed state, and set the working state of the wastewater feeding pump to the closed state.

[0037] In some embodiments of the present application, it further includes a main wastewater treatment system. The main wastewater treatment system is connected to the outlet of the wastewater pre-sedimentation tank through a pipeline. A fourth valve is provided at the outlet of the wastewater pre-sedimentation tank. The control unit is used to control the opening and closing of the fourth valve according to the turbidity of the wastewater in the wastewater pre-sedimentation tank. When the turbidity of the wastewater in the wastewater pre-sedimentation tank exceeds the turbidity threshold, the fourth valve is closed;

[0038] Wherein, the turbidity threshold is greater than the fourth preset turbidity Z4 of the wastewater pre-sedimentation tank.

[0039] The present invention also discloses a desulfurization wastewater treatment method. The treatment method is implemented by using the above-mentioned desulfurization wastewater treatment system. The method includes:

[0040] Collect the status data of the filtrate collection pool and the wastewater pre-sedimentation tank, where the status data includes the liquid level of the wastewater pre-sedimentation tank, the turbidity of the wastewater quality in the wastewater pre-sedimentation tank, and the turbidity of the wastewater quality in the filtrate collection pool;

[0041] Set the working status commands for the first regulating valve, the second regulating valve, the third regulating valve, and the wastewater feed pump according to the status data;

[0042] Control the first regulating valve, the second regulating valve, the third regulating valve, and the wastewater feed pump according to the working status commands set by the processing unit to achieve the treatment of desulfurization wastewater;

[0043] Among them, setting the working status commands for the first regulating valve, the second regulating valve, the third regulating valve, and the wastewater feed pump according to the status data includes:

[0044] Determine the turbidity of the wastewater quality in the wastewater pre-sedimentation tank and the liquid level of the wastewater pre-sedimentation tank, and determine the opening degrees of the first regulating valve and the second regulating valve according to the turbidity of the wastewater quality in the wastewater pre-sedimentation tank and the liquid level of the wastewater pre-sedimentation tank;

[0045] Determine the turbidity of the wastewater quality in the filtrate collection pool, and determine the opening degree of the third regulating valve and the working status of the wastewater feed pump according to the turbidity of the wastewater quality in the filtrate collection pool.

[0046] The present invention provides a desulfurization wastewater treatment system, including: a gypsum hydrocyclone, a vacuum belt filter, a filtrate collection pool, a wastewater pre-sedimentation tank, and a control module; the bottom outlet of the gypsum hydrocyclone is connected to the inlet of the vacuum belt filter through a first pipeline, the outlet of the vacuum belt filter is connected to the inlet of the wastewater pre-sedimentation tank through a second pipeline, the outlet of the vacuum belt filter is also connected to the inlet of the filtrate collection pool through a third pipeline, and the outlet of the filtrate collection pool is connected to the inlet of the wastewater pre-sedimentation tank through a fourth pipeline; a first regulating valve is arranged on the second pipeline, a second regulating valve is arranged on the third pipeline, a third regulating valve and a wastewater feed pump are arranged on the fourth pipeline; the control module is connected to the first regulating valve, the second regulating valve, the third regulating valve, and the wastewater feed pump, and the control module is used to control the working status of the first regulating valve, the second regulating valve, the third regulating valve, and the wastewater feed pump.

[0047] The present invention controls the first regulating valve and the second regulating valve according to the status data of the wastewater pre-sedimentation tank, directly introduces the wastewater separated by the vacuum pump steam separator in the vacuum belt filter into the wastewater pre-sedimentation tank, solves the problem of the wastewater pre-sedimentation tank turning muddy, ensures that the wastewater pre-sedimentation tank remains clear, and further ensures the continuous operation of the wastewater treatment system and improves the wastewater treatment efficiency.

[0048] Meanwhile, since the wastewater separated by the vacuum pump steam-water separator in the vacuum belt filter press has the highest chloride ion concentration, it is directly discharged into the wastewater pre-sedimentation tank to achieve precise wastewater treatment.

[0049] By detecting the turbidity of the water quality in the filtrate water tank, the operation of the wastewater feed pump is controlled to ensure the clarity of the wastewater discharged from the filtrate water tank into the wastewater pre-sedimentation tank, reduce the operation time of the wastewater treatment system, and reduce the operation time of the wastewater feed pump, saving energy and the environment and reducing costs.

[0050] Next, through the attached drawings and embodiments, the technical solutions of the present invention will be further described in detail. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 is a schematic structural diagram of a desulfurization wastewater treatment system of the present invention;

[0052] Figure 2 is a functional block diagram of the control module in an embodiment of the present invention;

[0053] Figure 3 is a schematic flow diagram of a desulfurization wastewater treatment method of the present invention;

[0054] Figure 4 is a schematic flow diagram of a method for setting the working state instruction of the processing unit in an embodiment of the present invention.

[0055] REFERENCE SIGNS

[0056] 1, gypsum hydrocyclone; 2, vacuum belt filter press; 21, vacuum pump steam-water separator; 3, filtrate water tank; 4, wastewater pre-sedimentation tank; 41, wastewater feed pump; 42, main wastewater treatment system; 51, first pipeline; 52, second pipeline; 53, third pipeline; 54, fourth pipeline; 55, fifth pipeline; 61, first regulating valve; 62, second regulating valve; 63, third regulating valve; 64, fourth valve. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0057] The following further illustrates the technical solutions of the present invention through the attached drawings and embodiments.

[0058] It should be noted that the following detailed descriptions are all illustrative and are intended to provide further explanations of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same general meaning as commonly understood by those of ordinary skill in the technical field to which the present invention belongs.

[0059] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof, without excluding other elements or objects. The "first", "second" and similar terms used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Terms such as "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "side", "bottom", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only relationship terms determined for the convenience of describing the structural relationship of each component or element of the present invention, and do not specifically refer to any component or element in the invention, and should not be construed as a limitation to the invention. Terms such as "fixed connection", "connected", "connected" should be understood in a broad sense, indicating that it can be a fixed connection, an integral connection or a detachable connection; it can be directly connected or indirectly connected through an intermediate medium. For those related scientific research or technical personnel in the field, the specific meanings of the above terms in the present invention can be determined according to specific circumstances, and should not be construed as a limitation to the present invention.

[0060] Embodiment

[0061] The present invention provides a desulfurized wastewater treatment system, as Figure 1 , Figure 2 shown, including: a gypsum hydrocyclone 1, a vacuum belt filter press 2, a filtrate water tank 3, a wastewater pre-sedimentation tank 4 and a control module.

[0062] The bottom outlet of the gypsum hydrocyclone 1 is connected to the inlet of the vacuum belt filter press 2 through a first pipeline 51, the outlet of the vacuum belt filter press 2 is connected to the inlet of the wastewater pre-sedimentation tank 4 through a second pipeline 52, the outlet of the vacuum belt filter press 2 is also connected to the inlet of the filtrate water tank 3 through a third pipeline 53, and the outlet of the filtrate water tank 3 is connected to the inlet of the wastewater pre-sedimentation tank 4 through a fourth pipeline 54.

[0063] A first regulating valve 61 is arranged on the second pipeline 52, a second regulating valve 62 is arranged on the third pipeline 53, and a third regulating valve 63 and a wastewater feeding pump 41 are arranged on the fourth pipeline 54.

[0064] The control module is connected to the first regulating valve 61, the second regulating valve 62, the third regulating valve 63 and the wastewater feeding pump 41, and the control module is used to control the working states of the first regulating valve 61, the second regulating valve 62, the third regulating valve 63 and the wastewater feeding pump 41.

[0065] The control module includes a collection unit, a processing unit, and a control unit. The collection unit is used to collect the status data of the filtrate water tank 3 and the wastewater pre-sedimentation tank 4.

[0066] The processing unit is used to set the working status instructions of the first regulating valve 61, the second regulating valve 62, the third regulating valve 63, and the wastewater feed pump 41 according to the status data.

[0067] The control unit is used to control the first regulating valve 61, the second regulating valve 62, the third regulating valve 63, and the wastewater feed pump 41 according to the working status instructions set by the processing unit.

[0068] This application realizes the preliminary treatment of wastewater by controlling the operating status of the valves and the wastewater feed pump in the desulfurization wastewater treatment system.

[0069] In some embodiments of this application, the vacuum belt filter is improved to enable the vacuum belt filter to achieve steam-water separation. The vacuum belt filter 2 includes a vacuum pump steam-water separator 21, and the vacuum pump steam-water separator 21 is used to separate the steam and water in the gypsum slurry and discharge the filtrate from the outlet of the vacuum belt filter 2.

[0070] In some embodiments of this application, the connection of the hydrocyclone is improved. The overflow port of the hydrocyclone 1 is connected to the inlet of the filtrate water tank 3 through the fifth pipeline 55.

[0071] In some embodiments of this application, the content of the status data is improved to provide more accurate data for the data processing of the subsequent processing unit. The status data includes: the liquid level of the wastewater pre-sedimentation tank, the turbidity of the water quality in the wastewater pre-sedimentation tank, and the turbidity of the water quality in the filtrate water tank.

[0072] In some embodiments of this application, the content of the collection unit is improved to make the data collection method of the collection unit more perfect and specific. The collection unit includes: a liquid level gauge, which is arranged in the wastewater pre-sedimentation tank 4 and is used to detect the liquid level of the wastewater pre-sedimentation tank 4 in real time.

[0073] A first turbidimeter, which is arranged in the wastewater pre-sedimentation tank 4 and is used to detect the turbidity of the water quality in the wastewater pre-sedimentation tank 4 in real time.

[0074] A second turbidimeter, which is arranged in the filtrate water tank 3 and is used to detect the turbidity of the water quality in the filtrate water tank 3 in real time.

[0075] In some embodiments of the present application, a specific method for the processing unit to process data is disclosed. The processing unit sets the working state commands of the first regulating valve 61, the second regulating valve 62, the third regulating valve 63, and the wastewater feed pump 41 according to the status data, including:

[0076] Determine the water quality turbidity of the wastewater pre-sedimentation tank 4 and the liquid level of the wastewater pre-sedimentation tank 4, and determine the opening degree of the first regulating valve 61 and the opening degree of the second regulating valve 62 according to the water quality turbidity of the wastewater pre-sedimentation tank 4 and the liquid level of the wastewater pre-sedimentation tank 4.

[0077] Determine the water quality turbidity of the filtrate water tank 3, and determine the opening degree of the third regulating valve 63 and the working state of the wastewater feed pump 41 according to the water quality turbidity of the filtrate water tank 3.

[0078] In this embodiment, the first regulating valve 61, the second regulating valve 62, and the third regulating valve 63 are solenoid valves, which are convenient for the control unit to perform automatic control.

[0079] In some embodiments of the present application, a specific method for the processing unit to set the opening degrees of the first regulating valve and the second regulating valve is disclosed. A preset water quality turbidity matrix Z0 of the wastewater pre-sedimentation tank is set in the processing unit, and Z0(Z1, Z2, Z3, Z4) is set, where Z1 is the first preset water quality turbidity of the wastewater pre-sedimentation tank, Z2 is the second preset water quality turbidity of the wastewater pre-sedimentation tank, Z3 is the third preset water quality turbidity of the wastewater pre-sedimentation tank, Z4 is the fourth preset water quality turbidity of the wastewater pre-sedimentation tank, and Z1 < Z2 < Z3 < Z4.

[0080] A preset liquid level matrix L0 of the wastewater pre-sedimentation tank is set, and L0(L1, L2, L3, L4) is set, where L1 is the first preset liquid level, L2 is the second preset liquid level, L3 is the third preset liquid level, L4 is the fourth preset liquid level, and L1 < L2 < L3 < L4.

[0081] A preset valve opening degree matrix P0 is set, and P0(P1, P2, P3, P4) is set, where P1 is the first preset valve opening degree, P2 is the second preset valve opening degree, P3 is the third preset valve opening degree, P4 is the fourth preset valve opening degree, and P1 < P2 < P3 < P4.

[0082] Obtain the water quality turbidity z of the wastewater pre-sedimentation tank and the liquid level l of the wastewater pre-sedimentation tank, and set the opening degrees of the first regulating valve and the second regulating valve according to the relationship between the water quality turbidity z of the wastewater pre-sedimentation tank and each preset water quality turbidity of the wastewater pre-sedimentation tank and the relationship between the liquid level l of the wastewater pre-sedimentation tank and each preset liquid level.

[0083] When z < Z1 and l < L1, set the fourth preset valve opening P4 as the opening of the first regulating valve, and set the first preset valve opening P1 as the opening of the second regulating valve.

[0084] When Z1 ≤ z < Z2 and L1 ≤ l < L2, set the third preset valve opening P3 as the opening of the first regulating valve, and set the second preset valve opening P2 as the opening of the second regulating valve.

[0085] When Z2 ≤ z < Z3 and L2 ≤ l < L3, set the second preset valve opening P2 as the opening of the first regulating valve, and set the third preset valve opening P3 as the opening of the second regulating valve.

[0086] When Z3 ≤ z < Z4 and L3 ≤ l < L4, set the first preset valve opening P1 as the opening of the first regulating valve, and set the fourth preset valve opening P4 as the opening of the second regulating valve.

[0087] In some embodiments of the present application, a specific method for the processing unit to set the opening of the third regulating valve and the working state of the wastewater feed pump is disclosed. A preset turbidity matrix T0 of the filtrate water tank is set in the processing unit, and T0(T1, T2, T3, T4) is set, where T1 is the first preset turbidity of the filtrate water tank, T2 is the second preset turbidity of the filtrate water tank, T3 is the third preset turbidity of the filtrate water tank, T4 is the fourth preset turbidity of the filtrate water tank, and T1 < T2 < T3 < T4.

[0088] The working state of the wastewater feed pump includes an operating state and a closed state.

[0089] Obtain the turbidity t of the filtrate water tank, and set the opening of the third regulating valve and the working state of the wastewater feed pump according to the relationship between the turbidity t of the filtrate water tank and each preset turbidity of the filtrate water tank.

[0090] When t < T1, set the third preset valve opening P3 as the opening of the third regulating valve, and set the working state of the wastewater feed pump to the operating state.

[0091] When T1 ≤ t < T2, set the second preset valve opening P2 as the opening of the third regulating valve, and set the working state of the wastewater feed pump to the operating state.

[0092] When T2 ≤ t < T3, set the first preset valve opening P1 as the opening of the third regulating valve, and set the working state of the wastewater feed pump to the operating state.

[0093] When T3 ≤ t < T4, set the third regulating valve to the closed state and set the working state of the wastewater feed pump to the closed state.

[0094] In some embodiments of the present application, it further includes a main wastewater treatment system 42. The main wastewater treatment system 42 is connected to the outlet of the wastewater pre-sedimentation tank 4 through a pipeline. A fourth valve 64 is provided at the outlet of the wastewater pre-sedimentation tank 4. The control unit is used to control the opening and closing of the fourth valve 64 according to the turbidity of the water quality in the wastewater pre-sedimentation tank 4. When the turbidity of the water quality in the wastewater pre-sedimentation tank 4 exceeds the turbidity threshold, the fourth valve 64 is closed.

[0095] Wherein, the turbidity threshold is greater than the fourth preset turbidity Z4 of the wastewater pre-sedimentation tank water quality.

[0096] The present invention also discloses a desulfurized wastewater treatment method. The treatment method is implemented by using the desulfurized wastewater treatment system as described above, as Figure 3 、 Figure 4 shown. The method includes:

[0097] S1, collect the status data of the filtrate water tank and the wastewater pre-sedimentation tank. The status data includes the liquid level of the wastewater pre-sedimentation tank, the turbidity of the water quality in the wastewater pre-sedimentation tank, and the turbidity of the water quality in the filtrate water tank.

[0098] S2, set the working state instructions of the first regulating valve, the second regulating valve, the third regulating valve, and the wastewater feed pump according to the status data.

[0099] S3, control the first regulating valve, the second regulating valve, the third regulating valve, and the wastewater feed pump according to the working state instructions set by the processing unit to realize the treatment of desulfurized wastewater.

[0100] Wherein, in the step S2, setting the working state instructions of the first regulating valve, the second regulating valve, the third regulating valve, and the wastewater feed pump according to the status data includes:

[0101] S201, determine the turbidity of the water quality in the wastewater pre-sedimentation tank and the liquid level of the wastewater pre-sedimentation tank, and determine the opening degrees of the first regulating valve and the second regulating valve according to the turbidity of the water quality in the wastewater pre-sedimentation tank and the liquid level of the wastewater pre-sedimentation tank.

[0102] S202, determine the turbidity of the water quality in the filtrate water tank, and determine the opening degree of the third regulating valve and the working state of the wastewater feed pump according to the turbidity of the water quality in the filtrate water tank.

[0103] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that they can still modify or equivalently replace the technical solutions of the present invention, and these modifications or equivalent replacements cannot make the modified technical solutions deviate from the spirit and scope of the technical solutions of the present invention.

[0104] For the system provided by the above embodiments, only the division of the above functional modules is used as an example for illustration. In actual applications, the above functions can be allocated to different functional modules according to needs, that is, the modules or steps in the embodiments of the present invention can be further decomposed or combined. For example, the modules in the above embodiments can be combined into one module, or further split into multiple sub-modules to complete all or part of the functions described above. For the names of the modules and steps involved in the embodiments of the present invention, they are only used to distinguish each module or step and are not regarded as an improper limitation of the present invention.

[0105] Those skilled in the art should be able to realize that the modules and method steps of each example described in combination with the embodiments disclosed herein can be implemented by electronic hardware, computer software, or a combination of the two. The programs corresponding to the software modules and method steps can be placed in a random access memory (RAM), internal memory, read-only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, removable disk, CD-ROM, or any other form of storage medium well known in the technical field. To clearly illustrate the interchangeability of electronic hardware and software, the composition and steps of each example have been generally described according to functions in the above description. Whether these functions are executed in the form of electronic hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of the present invention.

Claims

1. A desulfurized wastewater treatment system, characterized in that, it includes: a gypsum hydrocyclone, a vacuum belt filter, a filtrate water tank, a wastewater pre-sedimentation tank and a control module; The bottom outlet of the gypsum hydrocyclone is connected to the inlet of the vacuum belt filter through a first pipeline, the outlet of the vacuum belt filter is connected to the inlet of the wastewater pre-sedimentation tank through a second pipeline, the outlet of the vacuum belt filter is also connected to the inlet of the filtrate water tank through a third pipeline, and the outlet of the filtrate water tank is connected to the inlet of the wastewater pre-sedimentation tank through a fourth pipeline; A first regulating valve is arranged on the second pipeline, a second regulating valve is arranged on the third pipeline, and a third regulating valve and a wastewater feeding pump are arranged on the fourth pipeline; The control module is connected to the first regulating valve, the second regulating valve, the third regulating valve and the wastewater feeding pump, and the control module is used to control the working states of the first regulating valve, the second regulating valve, the third regulating valve and the wastewater feeding pump; The control module includes a collection unit, a processing unit and a control unit, and the collection unit is used to collect the state data of the filtrate water tank and the wastewater pre-sedimentation tank; The processing unit is used to set the working state instructions of the first regulating valve, the second regulating valve, the third regulating valve and the wastewater feeding pump according to the state data; The control unit is used to control the first regulating valve, the second regulating valve, the third regulating valve and the wastewater feeding pump according to the working state instructions set by the processing unit.

2. The desulfurized wastewater treatment system according to claim 1, characterized in that, the vacuum belt filter includes a vacuum pump steam-water separator, and the vacuum pump steam-water separator is used to separate the steam and water in the gypsum slurry and discharge the filtrate from the outlet of the vacuum belt filter.

3. The desulfurized wastewater treatment system according to claim 1, characterized in that, the overflow port of the gypsum hydrocyclone is connected to the inlet of the filtrate water tank through a fifth pipeline.

4. The desulfurized wastewater treatment system according to claim 1, characterized in that, the state data includes: the liquid level of the wastewater pre-sedimentation tank, the turbidity of the water quality in the wastewater pre-sedimentation tank, and the turbidity of the water quality in the filtrate water tank.

5. The desulfurized wastewater treatment system according to claim 1, characterized in that, the collection unit includes: a liquid level gauge arranged in the wastewater pre-sedimentation tank for real-time detection of the liquid level of the wastewater pre-sedimentation tank; a first turbidity meter arranged in the wastewater pre-sedimentation tank for real-time detection of the turbidity of the water quality in the wastewater pre-sedimentation tank; a second turbidity meter arranged in the filtrate water tank for real-time detection of the turbidity of the water quality in the filtrate water tank.

6. The desulfurized wastewater treatment system according to claim 1, characterized in that, the processing unit sets the working state instructions of the first regulating valve, the second regulating valve, the third regulating valve and the wastewater feeding pump according to the state data, including: determining the turbidity of the water quality in the wastewater pre-sedimentation tank and the liquid level of the wastewater pre-sedimentation tank, and determining the opening degrees of the first regulating valve and the second regulating valve according to the turbidity of the water quality in the wastewater pre-sedimentation tank and the liquid level of the wastewater pre-sedimentation tank; Determine the turbidity of the water quality in the filtrate water tank, and determine the opening degree of the third regulating valve and the working state of the waste water feed pump according to the turbidity of the water quality in the filtrate water tank.

7. A desulfurization waste water treatment system according to claim 6, characterized in that, a preset waste water pre-sedimentation tank water quality turbidity matrix Z0 is set in the treatment unit, and Z0(Z1, Z2, Z3, Z4) is set, where Z1 is the water quality turbidity of the first preset waste water pre-sedimentation tank, Z2 is the water quality turbidity of the second preset waste water pre-sedimentation tank, Z3 is the water quality turbidity of the third preset waste water pre-sedimentation tank, Z4 is the water quality turbidity of the fourth preset waste water pre-sedimentation tank, and Z1 < Z2 < Z3 < Z4; a preset waste water pre-sedimentation tank liquid level matrix L0 is set, and L0(L1, L2, L3, L4) is set, where L1 is the first preset liquid level, L2 is the second preset liquid level, L3 is the third preset liquid level, L4 is the fourth preset liquid level, and L1 < L2 < L3 < L4; a preset valve opening degree matrix P0 is set, and P0(P1, P2, P3, P4) is set, where P1 is the first preset valve opening degree, P2 is the second preset valve opening degree, P3 is the third preset valve opening degree, P4 is the fourth preset valve opening degree, and P1 < P2 < P3 < P4; Obtain the water quality turbidity z of the waste water pre-sedimentation tank and the liquid level l of the waste water pre-sedimentation tank, and set the opening degrees of the first regulating valve and the second regulating valve according to the relationship between the water quality turbidity z of the waste water pre-sedimentation tank and the water quality turbidities of each preset waste water pre-sedimentation tank and the relationship between the liquid level l of the waste water pre-sedimentation tank and each preset liquid level; When z < Z1 and l < L1, set the fourth preset valve opening degree P4 as the opening degree of the first regulating valve, and set the first preset valve opening degree P1 as the opening degree of the second regulating valve; When Z1 ≤ z < Z2 and L1 ≤ l < L2, set the third preset valve opening degree P3 as the opening degree of the first regulating valve, and set the second preset valve opening degree P2 as the opening degree of the second regulating valve; When Z2 ≤ z < Z3 and L2 ≤ l < L3, set the second preset valve opening degree P2 as the opening degree of the first regulating valve, and set the third preset valve opening degree P3 as the opening degree of the second regulating valve; When Z3 ≤ z < Z4 and L3 ≤ l < L4, set the first preset valve opening degree P1 as the opening degree of the first regulating valve, and set the fourth preset valve opening degree P4 as the opening degree of the second regulating valve.

8. A desulfurization waste water treatment system according to claim 7, characterized in that, a preset filtrate water tank water quality turbidity matrix T0 is set in the treatment unit, and T0(T1, T2, T3, T4) is set, where T1 is the water quality turbidity of the first preset filtrate water tank, T2 is the water quality turbidity of the second preset filtrate water tank, T3 is the water quality turbidity of the third preset filtrate water tank, T4 is the water quality turbidity of the fourth preset filtrate water tank, and T1 < T2 < T3 < T4; The working state of the waste water feed pump includes an operating state and a closed state; Obtain the water quality turbidity t of the filtrate water tank, and set the opening degree of the third regulating valve and the working state of the waste water feeding pump according to the relationship between the water quality turbidity t of the filtrate water tank and each preset filtrate water tank water quality turbidity; When t < T1, set the third preset valve opening degree P3 as the opening degree of the third regulating valve, and set the working state of the waste water feeding pump as the running state; When T1 ≤ t < T2, set the second preset valve opening degree P2 as the opening degree of the third regulating valve, and set the working state of the waste water feeding pump as the running state; When T2 ≤ t < T3, set the first preset valve opening degree P1 as the opening degree of the third regulating valve, and set the working state of the waste water feeding pump as the running state; When T3 ≤ t < T4, set the third regulating valve to the closed state, and set the working state of the waste water feeding pump to the closed state.

9. A desulfurized waste water treatment system according to claim 8, characterized in that, It further includes a main waste water treatment system, the main waste water treatment system is connected to the outlet of the waste water pre-sedimentation tank through a pipeline, a fourth valve is arranged at the outlet of the waste water pre-sedimentation tank, and the control unit is used to control the opening and closing of the fourth valve according to the water quality turbidity of the waste water pre-sedimentation tank. When the water quality turbidity of the waste water pre-sedimentation tank exceeds the turbidity threshold, the fourth valve is closed; wherein, the turbidity threshold is greater than the fourth preset waste water pre-sedimentation tank water quality turbidity Z4.

10. A desulfurized waste water treatment method, characterized in that, The treatment method is implemented by using the desulfurized waste water treatment system according to any one of claims 1-9, and the method includes: Collect the status data of the filtrate water tank and the waste water pre-sedimentation tank, and the status data includes the liquid level of the waste water pre-sedimentation tank, the water quality turbidity of the waste water pre-sedimentation tank, and the water quality turbidity of the filtrate water tank; Set the working state instructions of the first regulating valve, the second regulating valve, the third regulating valve and the waste water feeding pump according to the status data; Control the first regulating valve, the second regulating valve, the third regulating valve and the waste water feeding pump according to the working state instructions set by the processing unit to realize the treatment of desulfurized waste water; wherein, setting the working state instructions of the first regulating valve, the second regulating valve, the third regulating valve and the waste water feeding pump according to the status data includes: Determine the water quality turbidity of the waste water pre-sedimentation tank and the liquid level of the waste water pre-sedimentation tank, and determine the opening degree of the first regulating valve and the opening degree of the second regulating valve according to the water quality turbidity of the waste water pre-sedimentation tank and the liquid level of the waste water pre-sedimentation tank; Determine the water quality turbidity of the filtrate water tank, and determine the opening degree of the third regulating valve and the working state of the waste water feeding pump according to the water quality turbidity of the filtrate water tank.

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