Desulfurization wastewater sludge pretreatment system

Abstract

The invention discloses a desulfurization wastewater sludge pretreatment system, the desulfurization wastewater sludge pretreatment system comprises a wastewater cyclone station, a pre-sedimentation tank, an integrated clarifier and a dehydrator, the pre-sedimentation tank is communicated with an outlet of the wastewater cyclone station, the pre-sedimentation tank is provided with an overflow port and a bottom drain outlet, the overflow port is communicated with the integrated clarifier, the bottom drain outlet is communicated with the integrated clarifier, and the dehydrator is communicated with the integrated clarifier. The bottom drain outlet is formed in the bottom of the pre-sedimentation tank and communicated with the dehydrator, and the bottom drain outlet can be opened and closed. According to the desulfurization wastewater sludge pretreatment system, when excessive sludge is accumulated at the bottom of the pre-sedimentation tank, the dewaterer can be used for direct treatment, and upper-layer sewage overflows into the integrated clarifier for further sedimentation, so that the influence of overlarge sludge accumulation height of a traditional pre-sedimentation tank on the operation time of desulfurization wastewater can be avoided; the content of chloride ions in the slurry of the absorption tower can be reduced to a reasonable range, the desulfurization effect is ensured, the sludge accumulation amount is reduced, the abrasion of a sludge feeding pump can be reduced, the replacement period of a pump body is prolonged, and the operation cost is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of desulfurization wastewater treatment technology, and in particular to a desulfurization wastewater sludge pretreatment system. Background Art

[0002] At present, the most common technology for treating desulfurization wastewater in thermal power plants is that the top flow of the desulfurization gypsum cyclone station is further diverted through the wastewater cyclone station, and the top flow enters the pre-sedimentation tank. In the pre-sedimentation tank, about 90% of the sludge settles at the bottom, and the top clarified liquid overflows into the triple box or integrated clarifier for dosing treatment.

[0003] However, in actual operation, due to the wear or pressure of the sand settling nozzle, the density of the top flow of the wastewater cyclone station is about 8%-10%, which is much higher than the theoretical 2%. As a result, there is a lot of sludge accumulation in the pre-sedimentation tank. The high sludge level affects the operation time of the desulfurization wastewater, which in turn causes the chloride ion content in the absorption tower slurry to fail to drop. At the same time, the sludge feed pump is worn due to the large number of particles in the sludge, which shortens the pump replacement cycle and increases the operating cost. Summary of the invention

[0004] The technical problem to be solved by the present invention is that, in view of the defects and shortcomings of the prior art, a desulfurization wastewater sludge pretreatment system is proposed. When there is too much sludge accumulation at the bottom of the pre-sedimentation tank, the desulfurization wastewater sludge pretreatment system can use a dewatering machine to directly treat it, and the upper sewage overflows into the integrated clarifier for further sedimentation, thereby avoiding the influence of the excessive sludge accumulation height in the traditional pre-sedimentation tank on the operation time of the desulfurization wastewater, thereby ensuring that the chloride ion content in the absorption tower slurry can be reduced to a reasonable range, ensuring the desulfurization effect, and the reduction of sludge accumulation can reduce the wear of the sludge feeding pump, extend the replacement cycle of the pump body, and reduce the operating cost.

[0005] The desulfurization wastewater sludge pretreatment system of the embodiment of the present invention includes a wastewater cyclone station, a pre-sedimentation tank, an integrated clarifier and a dewatering machine. The pre-sedimentation tank is connected to the outlet of the wastewater cyclone station, and the pre-sedimentation tank has an overflow port and a bottom sewage outlet. The overflow port is connected to the integrated clarifier, and the bottom sewage outlet is arranged at the bottom of the pre-sedimentation tank and is connected to the dewatering machine. The bottom sewage outlet can be opened and closed.

[0006] In the desulfurization wastewater sludge pretreatment system of the embodiment of the present invention, the pre-sedimentation tank is connected with the outlet of the wastewater cyclone station, and the pre-sedimentation tank has an overflow port and a bottom sewage outlet, the overflow port is connected with the integrated clarifier, the bottom sewage outlet is arranged at the bottom of the pre-sedimentation tank and is connected with the dewatering machine, and the bottom sewage outlet can be opened and closed, thereby, when too much sludge is accumulated at the bottom of the pre-sedimentation tank, the dewatering machine can be used for direct treatment, and the upper sewage overflows into the integrated clarifier for further sedimentation, thereby avoiding the influence of the excessive sludge accumulation height of the traditional pre-sedimentation tank on the operation time of the desulfurization wastewater, thereby ensuring that the chloride ion content in the absorption tower slurry can be reduced to a reasonable range, ensuring the desulfurization effect, and the reduction of sludge accumulation can reduce the wear of the sludge feeding pump, extend the replacement cycle of the pump body, and reduce the operating cost.

[0007] In some embodiments, the desulfurization wastewater sludge pretreatment system also includes a gravity sensor and a controller. An electric door is provided at the bottom sewage outlet. The gravity sensor is used to sense the gravity borne by the electric door. The controller controls the opening and closing of the electric door according to the detection information of the gravity sensor.

[0008] In some embodiments, the desulfurization wastewater sludge pretreatment system also includes a sedimentation layer thickness indicator, which is used to detect the sludge sedimentation thickness in the pre-sedimentation tank, and the controller controls the opening and closing of the electric door according to the detection information of the sedimentation layer thickness indicator.

[0009] In some embodiments, the desulfurization wastewater sludge pretreatment system further includes a sludge buffer tank, and an openable and closable discharge port is provided at the bottom of the integrated clarifier, and the sludge buffer tank is connected to the discharge port.

[0010] In some embodiments, the desulfurization wastewater sludge pretreatment system further includes a plate and frame filter press, and the plate and frame filter press is connected to the sludge buffer tank.

[0011] In some embodiments, the outlet of the dehydrator is connected to the plate and frame filter press.

[0012] In some embodiments, an auxiliary sewage outlet is also provided at the bottom of the pre-sedimentation tank, and the auxiliary sewage outlet is connected to the sludge buffer tank. When the gravity sensor detects that the gravity borne by the electric door is too large, the controller controls the electric door and the auxiliary sewage outlet to open at the same time.

[0013] In some embodiments, a first sludge feeding pump is provided between the bottom sewage outlet and the dewatering machine, a second sludge feeding pump is provided between the integrated clarifier and the sludge buffer tank, a third sludge feeding pump is provided between the sludge buffer tank and the plate and frame filter press, and a fourth sludge feeding pump is provided between the auxiliary sewage outlet and the sludge buffer tank.

[0014] In some embodiments, the desulfurization wastewater sludge pretreatment system further includes a dosing device, which is used to add a coagulant into the integrated clarifier.

[0015] In some embodiments, there are multiple bottom drain outlets and multiple dehydrators, and each dehydrator corresponds to one bottom drain outlet. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the process of the desulfurization wastewater sludge pretreatment system according to an embodiment of the present invention.

[0017] Reference numerals:

[0018] Wastewater cyclone station 1, pre-sedimentation tank 2, integrated clarifier 3, sludge buffer tank 4, plate and frame filter press 5, dewatering machine 6. DETAILED DESCRIPTION

[0019] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0020] like Figure 1 As shown, the desulfurization wastewater sludge pretreatment system of an embodiment of the present invention includes a wastewater cyclone station 1, a pre-sedimentation tank 2, an integrated clarifier 3 and a dewatering machine 6. The pre-sedimentation tank 2 is connected to the outlet of the wastewater cyclone station 1, and the pre-sedimentation tank 2 has an overflow port and a bottom sewage outlet. The overflow port is connected to the integrated clarifier 3, and the bottom sewage outlet is arranged at the bottom of the pre-sedimentation tank 2 and is connected to the dewatering machine 6, and the bottom sewage outlet can be opened and closed.

[0021] It can be understood that the sludge precipitated in the pre-sedimentation tank 2 can flow to the dewatering machine 6 through the bottom sewage outlet for dewatering treatment, and the overflow wastewater at the top enters the integrated clarifier 3 for further precipitation. Therefore, the sludge contained in the wastewater has two directions. The precipitated sludge is directly dewatered by the dewatering machine 6, and the unprecipitated sludge is further treated by the integrated clarifier 3. Compared with the traditional desulfurization wastewater treatment process, when there is a lot of sludge accumulated at the bottom of the pre-sedimentation tank 2, it can be directly treated by the dewatering machine 6, thereby eliminating the influence of sludge accumulation on the running time of desulfurization wastewater, ensuring that the chloride ion content in the absorption tower slurry can be reduced to the normal range in time, ensuring the desulfurization effect, and at the same time, since the sludge accumulation problem is solved, the wear of the sludge feed pump can be reduced, the replacement cycle can be extended, and the operating cost can be reduced. Moreover, since part of the sludge is treated by the dewatering machine 6, the total amount of sludge produced by the subsequent integrated clarifier 3 is reduced, the amount of manual sludge unloading is reduced, and labor is saved.

[0022] In the desulfurization wastewater sludge pretreatment system of the embodiment of the present invention, the pre-sedimentation tank 2 is connected with the outlet of the wastewater cyclone station 1, and the pre-sedimentation tank 2 has an overflow port and a bottom sewage outlet, the overflow port is connected with the integrated clarifier 3, the bottom sewage outlet is arranged at the bottom of the pre-sedimentation tank 2 and is connected with the dewatering machine 6, and the bottom sewage outlet can be opened and closed. Therefore, when there is too much sludge accumulation at the bottom of the pre-sedimentation tank 2, the dewatering machine 6 can be used for direct treatment, and the upper sewage overflows into the integrated clarifier 3 for further precipitation, thereby avoiding the influence of the excessive sludge accumulation height of the traditional pre-sedimentation tank 2 on the operation time of the desulfurization wastewater, thereby ensuring that the chloride ion content in the absorption tower slurry can be reduced to a reasonable range, ensuring the desulfurization effect, and the reduction of sludge accumulation can reduce the wear of the sludge feeding pump, extend the replacement cycle of the pump body, and reduce the operating cost.

[0023] In some embodiments, the desulfurization wastewater sludge treatment system further includes a gravity sensor and a controller, an electric door is provided at the bottom sewage outlet, the gravity sensor is used to sense the gravity borne by the electric door, and the controller controls the opening and closing of the electric door according to the detection information of the gravity sensor. It can be understood that the greater the sludge accumulation height, the greater its gravity, and accordingly, the electric door is overloaded, so the sludge accumulation height can be judged based on the gravity borne by the electric door, and then the controller is used to control the opening of the electric door to timely clear the bottom of the sludge when the sludge accumulation is too high, so that the desulfurization wastewater can flow normally.

[0024] In other embodiments, the desulfurization wastewater sludge treatment system further includes a sedimentation layer thickness indicator, which is used to detect the sludge sedimentation thickness in the pre-sedimentation tank 2, and the controller controls the opening and closing of the electric door according to the detection information of the sedimentation layer thickness indicator. Specifically, when the sedimentation layer thickness indicator shows that the sludge accumulation height in the pre-sedimentation tank 2 exceeds the preset standard, the controller can control the electric door to open for timely sewage discharge to ensure that there is no problem of excessive sludge accumulation in the pre-sedimentation tank 2. The sedimentation layer thickness indicator and the gravity sensor can be used as dual detection guarantees in different directions. When a single detection element fails, the other detection element can cooperate with the controller to ensure the timely discharge of sludge, and the system operation reliability is high.

[0025] Furthermore, the desulfurization wastewater sludge pretreatment system further includes a sludge buffer tank 4, and an openable and closable discharge port is provided at the bottom of the integrated clarifier 3, and the sludge buffer tank 4 is connected to the discharge port. Thus, the sludge precipitated in the integrated clarifier 3 can be transferred to the sludge buffer tank 4 for storage and enter the next treatment process.

[0026] Furthermore, the desulfurization wastewater sludge pretreatment system further comprises a plate-frame filter press 5, which is connected to the sludge buffer tank 4. Thus, the sludge discarded by desulfurization can eventually be made into a mud cake through the plate-frame filter press 5 to realize sludge reuse.

[0027] Optionally, the outlet of the dehydrator 6 is connected to the plate and frame filter press 5 .

[0028] Furthermore, an auxiliary sewage outlet is provided at the bottom of the pre-sedimentation tank 2, and the auxiliary sewage outlet is connected to the sludge buffer tank 4. When the gravity sensor detects that the gravity borne by the electric door is too large, the controller controls the electric door and the auxiliary sewage outlet to open at the same time. It is understandable that when the sludge content in the desulfurization wastewater is too large, resulting in a large amount of accumulation in the pre-sedimentation tank 2, the dehydrator 6 may have a problem of excessive processing pressure. At this time, the auxiliary sewage outlet can be opened, and the auxiliary sewage outlet can discharge sewage to the sludge buffer tank 4, share the pressure of the dehydrator 6, and ensure the normal operation of the system.

[0029] In some embodiments, a first sludge feeding pump is provided between the bottom sewage outlet and the dewatering machine 6, a second sludge feeding pump is provided between the integrated clarifier 3 and the sludge buffer tank 4, a third sludge feeding pump is provided between the sludge buffer tank 4 and the plate and frame filter press 5, and a fourth sludge feeding pump is provided between the auxiliary sewage outlet and the sludge buffer tank 4. It is understandable that the sludge feeding pump can adjust the power according to demand to ensure the processing efficiency of each treatment process.

[0030] Furthermore, the desulfurization wastewater sludge pretreatment system also includes a dosing device, which is used to add a coagulant into the integrated clarifier 3 to assist the coagulation of impurity particles and improve the separation efficiency.

[0031] In some embodiments, there are multiple bottom drain outlets and multiple dehydrators 6, each of which corresponds to a bottom drain outlet. Thus, the multiple dehydrators 6 can selectively start a corresponding number of dehydrators 6 according to the amount of sludge, which not only meets the sludge treatment requirements but also avoids waste.

[0032] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0033] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0034] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0036] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0037] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A desulfurization wastewater sludge pretreatment system, characterized in that: It includes a wastewater cyclone station, a pre-sedimentation tank, an integrated clarifier and a dehydrator. The pre-sedimentation tank is connected to the outlet of the wastewater cyclone station, and the pre-sedimentation tank has an overflow port and a bottom sewage outlet. The overflow port is connected to the integrated clarifier. The bottom sewage outlet is arranged at the bottom of the pre-sedimentation tank and is connected to the dehydrator. The bottom sewage outlet can be opened and closed.

2. The desulfurization wastewater sludge pretreatment system according to claim 1, characterized in that: It also includes a gravity sensor and a controller. An electric door is provided at the bottom sewage outlet. The gravity sensor is used to sense the gravity borne by the electric door. The controller controls the opening and closing of the electric door according to the detection information of the gravity sensor.

3. The desulfurization wastewater sludge pretreatment system according to claim 2, characterized in that: It also includes a sedimentation layer thickness indicator, which is used to detect the sludge sedimentation thickness in the pre-sedimentation tank. The controller controls the opening and closing of the electric door according to the detection information of the sedimentation layer thickness indicator.

4. The desulfurization wastewater sludge pretreatment system according to claim 2, characterized in that: It also includes a sludge buffer tank. The bottom of the integrated clarifier is provided with a discharge port that can be opened and closed, and the sludge buffer tank is connected to the discharge port.

5. The desulfurization wastewater sludge pretreatment system according to claim 4, characterized in that: It also includes a plate and frame filter press, which is connected to the sludge buffer tank.

6. The desulfurization wastewater sludge pretreatment system according to claim 5, characterized in that: The outlet of the dehydrator is communicated with the plate and frame filter press.

7. The desulfurization wastewater sludge pretreatment system according to claim 4, characterized in that: An auxiliary sewage outlet is also provided at the bottom of the pre-sedimentation tank, and the auxiliary sewage outlet is connected to the sludge buffer tank. When the gravity sensor detects that the gravity borne by the electric door is too large, the controller controls the electric door and the auxiliary sewage outlet to open simultaneously.

8. The desulfurization wastewater sludge pretreatment system according to claim 7, characterized in that: A first sludge feeding pump is provided between the bottom sewage outlet and the dewatering machine, a second sludge feeding pump is provided between the integrated clarifier and the sludge buffer tank, a third sludge feeding pump is provided between the sludge buffer tank and the plate and frame filter press, and a fourth sludge feeding pump is provided between the auxiliary sewage outlet and the sludge buffer tank.

9. The desulfurization wastewater sludge pretreatment system according to claim 1, characterized in that: It also includes a dosing device, which is used to put a coagulation agent into the integrated clarifier.

10. The desulfurization wastewater sludge pretreatment system according to claim 1, characterized in that: There are multiple bottom sewage outlets and multiple dehydrators, and each dehydrator corresponds to one bottom sewage outlet.

Images