Desulfurization slurry filtering device for thermal power plant

Abstract

The invention relates to the technical field of thermal power plant equipment, in particular to a thermal power plant desulfurization slurry filtering device which comprises a storage chamber, a filtering chamber and a cleaning assembly. The storage chamber is used for storing the filtered desulfurization slurry. And the filtering chamber is arranged above the storage chamber. The filter cartridge is obliquely mounted in the filter chamber, can rotate around the axis of the filter cartridge and is used for filtering desulfurization slurry. And the cleaning assembly penetrates through the filter cartridge. In the desulfurization slurry filtering process, the filter cartridge rotates at a low speed, and impurities can be effectively prevented from being accumulated and attached to the inner wall of the filter cartridge. When the inner wall of the filter cartridge is cleaned, the cleaning assembly does not rotate, and the filter cartridge rotates at a high speed. The cleaning assembly enables impurities attached to the inner wall of the filter cartridge to be separated from the inner wall of the filter cartridge. Compared with a mode of washing the filter cartridge outside the filter cartridge by virtue of a spray head, the cleaning effect is better.

Description

Technical Field

[0001] The invention relates to the technical field of thermal power plant equipment, in particular to a desulfurization slurry filtering device for a thermal power plant. Background Art

[0002] In the wet flue gas desulfurization process, the density of limestone slurry and the density of gypsum slurry in the absorption tower are important parameters for monitoring the operation status of the desulfurization system. In actual operation, if the density of the desulfurization slurry measured by the density meter cannot reflect the actual situation, it will directly affect the safety, economy and stability of the desulfurization system. The composition of the desulfurization slurry is very complex, and there are many solid impurities deposited in long-term operation, which are easy to clog the density meter and affect the accuracy of the density meter measurement results. Therefore, it is necessary to regularly filter the desulfurization slurry with the help of the desulfurization slurry filtration device of the thermal power plant.

[0003] During the long-term use of the existing thermal power plant desulfurization slurry filtering device, impurities are easily accumulated and attached to the inner wall of the filter cartridge. Therefore, it is necessary to clean the impurities attached to the inner wall of the filter cartridge in time. At present, the filter cartridge is washed on the outside of the filter cartridge with a spray head, but the cleaning effect is not good. Therefore, how to improve the cleaning effect has become a technical problem that needs to be solved urgently by those skilled in the art. Summary of the invention

[0004] The invention provides a desulfurization slurry filtering device for a thermal power plant, which is used to solve the problem of how to improve the cleaning effect of a filter cartridge.

[0005] The present invention provides a desulfurization slurry filtering device for a thermal power plant, comprising:

[0006] A storage room, used for storing filtered desulfurized slurry;

[0007] A filter chamber is arranged above the storage chamber;

[0008] The filter cartridge is installed obliquely in the filter chamber and can rotate around its own axis to filter the desulfurization slurry;

[0009] The cleaning component is inserted into the filter cartridge.

[0010] In some embodiments, the cleaning component includes:

[0011] The inner flow guide pipe is inserted into the filter cartridge, and is provided with a first liquid inlet nozzle at one end, and multiple liquid outlet nozzles are evenly arranged along the axial direction and the circumferential direction; the desulfurized slurry to be filtered flows through the first liquid inlet nozzle, the interior of the inner flow guide pipe and the liquid outlet nozzle in sequence, and then flows into the filter cartridge;

[0012] The outer flow guide tube is sleeved outside the inner flow guide tube and has a second liquid inlet nozzle at one end;

[0013] There are multiple cleaning parts, which are evenly installed on the outer guide tube along the axial and circumferential directions of the outer guide tube and are connected to the outer guide tube respectively; the filtered desulfurization slurry or water flows through the second liquid inlet nozzle, the interior of the outer guide tube and the cleaning parts in sequence and then reaches the inner wall of the filter cartridge.

[0014] In some embodiments, the cleaning portion near the higher end of the filter cartridge generates a radial force F1 on the filter cartridge, the cleaning portion near the middle of the filter cartridge generates a radial force F2 on the filter cartridge, and the cleaning portion near the lower end of the filter cartridge generates a radial force F3 on the filter cartridge; F1<F2<F3.

[0015] In some embodiments, each cleaning section comprises:

[0016] The shunt pipe has an axis perpendicular to the axis of the outer flow guide pipe, and one end is connected to the outer flow guide pipe and communicates with it;

[0017] A spray head is movably installed along the axis of the shunt pipe at one end of the shunt pipe away from the outer guide pipe;

[0018] A plurality of bristles are installed on an end surface of the spray head away from the diverter pipe;

[0019] An adjusting nut is screwed onto the shunt pipe;

[0020] The spring is sleeved on the shunt pipe, one end of the spring is in contact with an end surface of the sprinkler head close to the shunt pipe, and the other end of the spring is in contact with the adjusting nut.

[0021] In some embodiments, each cleaning section comprises:

[0022] The shunt pipe has an axis perpendicular to the axis of the outer flow guide pipe, and one end is connected to the outer flow guide pipe and communicates with it;

[0023] The spray head is fixedly installed on one end of the diversion pipe away from the external guide pipe.

[0024] In some embodiments, it also includes:

[0025] A three-way valve, one outlet of which is connected to the first liquid inlet nozzle, and the other outlet of which is connected to the second liquid inlet nozzle.

[0026] In some embodiments, it also includes:

[0027] A first booster pump, the outlet of which can be communicated with the inlet of the three-way valve;

[0028] The second booster pump has an outlet that can be communicated with the inlet of the three-way valve.

[0029] In some of the embodiments, opposite ends of the filter cartridge and opposite ends of the outer flow guide tube are rotatably connected via bearings.

[0030] In some embodiments, it also includes:

[0031] The rotary driver is installed on the filter chamber, and the output shaft is fixedly connected to the higher end of the filter cartridge, which can drive the filter cartridge to rotate around its own axis.

[0032] In some embodiments, the filter cartridge includes:

[0033] Cylinder;

[0034] an end cap detachably mounted on the lower end of the cylinder;

[0035] The filter chamber includes:

[0036] Cavity;

[0037] The end plate is detachably mounted on one end of the cavity.

[0038] The beneficial effects of the present invention are as follows: The desulfurization slurry filtering device for a thermal power plant of the present invention is provided with a storage chamber, and the storage chamber is used to store the filtered desulfurization slurry. In the process of filtering the desulfurization slurry, the filter cartridge rotates at a relatively low speed, which can effectively prevent the accumulation of impurities and adhere to the inner wall of the filter cartridge. When cleaning the inner wall of the filter cartridge, the cleaning component does not rotate, and the filter cartridge rotates at a relatively high speed. The cleaning component causes the impurities attached to the inner wall of the filter cartridge to separate from the inner wall of the filter cartridge. Compared with the method of flushing the filter cartridge on the outside of the filter cartridge by means of a spray head, the cleaning effect is better. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a schematic diagram of the internal structure of a desulfurization slurry filtering device for a thermal power plant according to the present invention;

[0040] Figure 2 yes Figure 1 A partial enlarged view of the middle A area;

[0041] Figure 3 yes Figure 1 The cross-sectional view perpendicular to the axial direction is shown in the cleaning component of the desulfurization slurry filtering device of the thermal power plant.

[0042] In the accompanying drawings, 110, storage chamber; 120, filter chamber; 121, cavity; 122, end plate; 130, filter cartridge; 131, cartridge; 132, end cover; 140, cleaning assembly; 141, inner guide tube; 1411, first liquid inlet nozzle; 1412, liquid outlet nozzle; 142, outer guide tube; 1421, second liquid inlet nozzle; 143, cleaning section; 1431, diverter tube; 1432, spray head; 1433, bristles; 1434, adjusting nut; 1435, spring; 150, bearing; 160, rotary drive. DETAILED DESCRIPTION

[0043] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0044] As described in the background technology, during the long-term use of the existing thermal power plant desulfurization slurry filtering device, impurities are easily accumulated and attached to the inner wall of the filter cylinder. Therefore, it is necessary to clean the impurities attached to the inner wall of the filter cylinder in time. At present, the filter cylinder is washed on the outside of the filter cylinder with a spray head, but the cleaning effect is not good. Therefore, how to improve the cleaning effect has become a technical problem that needs to be solved urgently by those skilled in the art.

[0045] To solve the above problems, refer to Figure 1 , Figure 2 and Figure 3 The present invention provides a desulfurization slurry filtering device for a thermal power plant, comprising a storage chamber 110, a filter chamber 120 and a cleaning assembly 140. The storage chamber 110 is used to store the filtered desulfurization slurry. The filter chamber 120 is arranged above the storage chamber 110. The filter cartridge 130 is obliquely installed in the filter chamber 120 and can rotate around its own axis to filter the desulfurization slurry. The cleaning assembly 140 is inserted into the filter cartridge 130.

[0046] During the filtering of the desulfurized slurry, the filter cartridge 130 rotates at a relatively low speed, which can effectively prevent impurities from accumulating and adhering to the inner wall of the filter cartridge 130. When the inner wall of the filter cartridge 130 is cleaned, the cleaning assembly 140 does not rotate, and the filter cartridge 130 rotates at a relatively high speed. The cleaning assembly 140 allows the impurities adhering to the inner wall of the filter cartridge 130 to separate from the inner wall of the filter cartridge 130. Compared with the method of flushing the filter cartridge 130 from the outside of the filter cartridge 130 by means of a spray head, the cleaning effect is better.

[0047] Preferably, the filter cartridge 130 includes a cartridge body 131 and an end cap 132. The cartridge body 131 is obliquely installed in the filter chamber 120. The end cap 132 is detachably installed at the lower end of the cartridge body 131. Specifically, the end cap 132 is installed at the lower end of the cartridge body 131 by bolts or latches. In this way, the disassembly and installation of the end cap 132 are facilitated, and the disassembly and installation of the cleaning assembly 140 are further facilitated.

[0048] Preferably, a drain valve is provided on the end cover 132 , and the drain valve is communicated with the interior of the cylinder 131 .

[0049] Preferably, the filter chamber 120 includes a cavity 121 and an end plate 122. The end plate 122 is detachably mounted on one end of the cavity 121. Specifically, the end plate 122 is mounted on the lower end of the cylinder 131 by bolts or latches. In this way, the end plate 122 is easy to disassemble and install.

[0050] Specifically, in the example, Figure 1 , Figure 2 and Figure 3 As shown, the cleaning assembly 140 includes an inner flow guide tube 141, an outer flow guide tube 142 and a plurality of cleaning parts 143. The inner flow guide tube 141 is inserted into the filter cartridge 130, and a first liquid inlet nozzle 1411 is provided at one end, and a plurality of liquid outlet nozzles 1412 are evenly provided along the axial direction and the circumferential direction. The outer flow guide tube 142 is sleeved outside the inner flow guide tube 141, and a second liquid inlet nozzle 1421 is provided at one end. A plurality of cleaning parts 143 are evenly installed on the outer flow guide tube 142 along the axial direction and the circumferential direction of the outer flow guide tube 142, and are respectively connected to the outer flow guide tube 142. Figure 1 The direction of the arrow in the middle shows the direction of liquid flow. The desulfurized slurry to be filtered flows through the first liquid inlet nozzle 1411, the interior of the inner flow guide tube 141 and the liquid outlet nozzle 1412 in sequence and then flows into the filter cartridge 130. The filtered desulfurized slurry or water flows through the second liquid inlet nozzle 1421, the interior of the outer flow guide tube 142 and the cleaning part 143 in sequence and then reaches the inner wall of the filter cartridge 130. The inner wall of the filter cartridge 130 can be cleaned with the help of the filtered desulfurized slurry or water, thereby improving the cleaning effect.

[0051] It should be pointed out that during long-term use, the lower end of the filter cartridge 130 has serious impurity adhesion, the middle part of the filter cartridge 130 has normal impurity adhesion, and the higher end of the filter cartridge 130 has less impurity adhesion. Assume that the radial force generated by the cleaning portion 143 near the higher end of the filter cartridge 130 on the filter cartridge 130 is F1, the radial force generated by the cleaning portion 143 near the middle part of the filter cartridge 130 on the filter cartridge 130 is F2, and the radial force generated by the cleaning portion 143 near the lower end of the filter cartridge 130 on the filter cartridge 130 is F3. In order to ensure the cleaning effect, F1<F2<F3, so as to ensure the cleaning effect on the lower end and the middle part of the filter cartridge 130.

[0052] In some embodiments, such as Figure 3As shown, each cleaning section 143 includes a shunt pipe 1431, a spray head 1432, a plurality of bristles 1433, two adjusting nuts 1434 and a spring 1435. The axis of the shunt pipe 1431 is perpendicular to the axis of the outer flow guide pipe 142, and one end is connected to and communicated with the outer flow guide pipe 142. The spray head 1432 can be movably installed on the end of the shunt pipe 1431 away from the outer flow guide pipe 142 along the axis of the shunt pipe 1431. A plurality of bristles 1433 are installed on an end face of the spray head 1432 away from the shunt pipe 1431. The two adjusting nuts 1434 are respectively screwed on the shunt pipe 1431, and are less likely to slip compared to a single adjusting nut 1434. The spring 1435 is sleeved on the shunt pipe 1431, one end of which abuts against an end face of the spray head 1432 close to the shunt pipe 1431, and the other end abuts against the adjusting nut 1434. Before installing the cleaning assembly 140 in the filter cartridge 130, first rotate the adjusting nut 1434 to adjust the compression degree of each spring 1435, and then adjust the radial force exerted by each spray head 1432 on the filter cartridge 130. During the high-speed rotation of the filter cartridge 130, the filtered desulfurized slurry or water flows through the second liquid inlet nozzle 1421, the interior of the outer guide tube 142, each diverter tube 1431 and each spray head 1432 in sequence, and then reaches the inner wall of the filter cartridge 130, and then brushes the inner wall of the filter cartridge 130 with the help of the bristles 1433, which reduces the cleaning difficulty and improves the cleaning effect.

[0053] Preferably, the bristles 1433 of each cleaning portion 143 near the lower end of the filter cartridge 130 are made of steel wire, and the bristles 1433 of each cleaning portion 143 near the higher end of the filter cartridge 130 are made of nylon wire or steel wire.

[0054] In some embodiments, each cleaning unit 143 includes a shunt pipe 1431 and a spray head 1432. The axis of the shunt pipe 1431 is perpendicular to the axis of the outer flow guide pipe 142, and one end is connected to and communicates with the outer flow guide pipe 142. The spray head 1432 is fixedly installed at one end of the shunt pipe 1431 away from the outer flow guide pipe 142. In this way, the structure of each cleaning unit 143 is relatively simple, which not only ensures the cleaning effect, but also reduces the manufacturing cost and installation difficulty of the cleaning unit 143.

[0055] Specifically, in the exemplary embodiment, the desulfurization slurry filtering device of the thermal power plant further includes a three-way valve, a first booster pump, a second booster pump, two bearings 150 and a rotary driver 160. One of the outlets of the three-way valve is connected to the first liquid inlet nozzle 1411, and the other outlet is connected to the second liquid inlet nozzle 1421. The outlet of the first booster pump can be connected to the inlet of the three-way valve. The outlet of the second booster pump can be connected to the inlet of the three-way valve. When the outlet of the first booster pump is connected to the inlet of the three-way valve, the desulfurization slurry to be filtered flows into the inner guide pipe 141 through the first booster pump and the three-way valve. The first booster pump can provide power for the desulfurization slurry to be filtered to flow into the inner guide pipe 141. When the outlet of the second booster pump is connected to the inlet of the three-way valve, the filtered desulfurization slurry or water flows into the outer guide pipe 142 through the first booster pump and the three-way valve. The second booster pump can provide power for the filtered desulfurization slurry or water to flow into the outer guide pipe 142. The opposite ends of the filter cartridge 130 and the opposite ends of the outer flow guide tube 142 are rotatably connected through a bearing 150 to reduce the resistance to the rotation of the filter cartridge 130 and prevent the outer flow guide tube 142 from rotating with the filter cartridge 130. The rotary driver 160 is installed on one side of the filter chamber 120, and the output shaft is fixedly connected to the higher end of the filter cartridge 130, which can drive the filter cartridge 130 to rotate around its own axis. In this way, the degree of automation is effectively improved.

[0056] Preferably, the rotary driver 160 may be a servo motor with high control accuracy or a stepper motor with low cost.

[0057] 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.

[0058] 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.

[0059] 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.

[0060] 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.

[0061] 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 slurry filtering device for a thermal power plant, characterized in that: include: A storage room, used for storing filtered desulfurized slurry; A filter chamber, disposed above the storage chamber; The filter cartridge is obliquely installed in the filter chamber and can rotate around its own axis to filter the desulfurized slurry; The cleaning component is inserted into the filter cartridge.

2. The desulfurization slurry filtering device for a thermal power plant according to claim 1, characterized in that: The cleaning component comprises: An inner flow guide pipe is inserted into the filter cartridge, and is provided with a first liquid inlet nozzle at one end, and multiple liquid outlet nozzles are evenly arranged along the axial direction and the circumferential direction; the desulfurized slurry to be filtered flows through the first liquid inlet nozzle, the interior of the inner flow guide pipe and the liquid outlet nozzle in sequence, and then flows into the filter cartridge; An outer flow guide tube is sleeved outside the inner flow guide tube and has a second liquid inlet nozzle at one end; There are multiple cleaning parts, which are evenly installed on the outer guide tube along the axial and circumferential directions of the outer guide tube and are respectively connected to the outer guide tube; the filtered desulfurization slurry or water flows through the second liquid inlet nozzle, the interior of the outer guide tube and the cleaning parts in sequence, and then reaches the inner wall of the filter cartridge.

3. The desulfurization slurry filtering device for a thermal power plant according to claim 2, characterized in that: The cleaning portion near the higher end of the filter cartridge generates a radial force F1 on the filter cartridge, the cleaning portion near the middle of the filter cartridge generates a radial force F2 on the filter cartridge, and the cleaning portion near the lower end of the filter cartridge generates a radial force F3 on the filter cartridge; F1<F2<F3.

4. The desulfurization slurry filtering device for a thermal power plant according to claim 3, characterized in that: Each of the cleaning sections comprises: A flow diversion pipe, the axis of which is perpendicular to the axis of the outer flow guide pipe, and one end of which is connected to and communicates with the outer flow guide pipe; A spray head is movably mounted on an end of the flow diversion pipe away from the outer flow guide pipe along the axis of the flow diversion pipe; A plurality of bristles are installed on an end surface of the spray head away from the diverter pipe; An adjusting nut, threadedly connected to the shunt pipe; The spring is sleeved on the shunt pipe, one end of which abuts against an end surface of the spray head close to the shunt pipe, and the other end abuts against the adjusting nut.

5. The desulfurization slurry filtering device for a thermal power plant according to claim 2, characterized in that: Each of the cleaning sections comprises: A flow diversion pipe, the axis of which is perpendicular to the axis of the outer flow guide pipe, and one end of which is connected to and communicates with the outer flow guide pipe; The spray head is fixedly mounted on one end of the flow diversion pipe away from the outer flow guide pipe.

6. The desulfurization slurry filtering device for a thermal power plant according to claim 2, characterized in that: Also includes: A three-way valve, wherein one outlet is connected to the first liquid inlet nozzle, and the other outlet is connected to the second liquid inlet nozzle.

7. The desulfurization slurry filtering device for a thermal power plant according to claim 6, characterized in that: Also includes: a first booster pump, the outlet of which can be communicated with the inlet of the three-way valve; The second booster pump has an outlet that can be communicated with the inlet of the three-way valve.

8. The desulfurization slurry filtering device for a thermal power plant according to claim 2, characterized in that: The opposite ends of the filter cartridge and the opposite ends of the outer flow guide tube are rotatably connected via bearings respectively.

9. The desulfurization slurry filtering device for a thermal power plant according to any one of claims 1 to 8, characterized in that: Also includes: The rotary driver is installed on the filter chamber, and the output shaft is fixedly connected to the higher end of the filter cartridge, and can drive the filter cartridge to rotate around its own axis.

10. The desulfurization slurry filtering device for a thermal power plant according to any one of claims 1 to 8, characterized in that: The filter cartridge comprises: Cylinder; an end cover detachably mounted on the lower end of the cylinder; The filter chamber comprises: Cavity; The end plate is detachably mounted on one end of the cavity.

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