Desulfurization slurry circulating pump system of energy-saving coal-fired unit

Abstract

The invention provides an energy-saving coal-fired unit desulfurization slurry circulating pump system, and belongs to the technical field of coal-fired unit desulfurization. A desulfurization slurry circulating pump system of an energy-saving coal-fired unit comprises a tower body, a desulfurization slurry recycling device and a spraying device, and the desulfurization slurry recycling device is connected with the tower body; the spraying device comprises a water storage tank, a first conveying pipe, a first conveying frame and first spraying heads, the water storage tank is connected with the first conveying pipe, the first conveying pipe is connected with the first conveying frame, and the first spraying heads are arranged on the first conveying frame; the desulfurization slurry recycling device comprises a stirring mechanism, a recycling box, a liquid storage box and a second conveying frame, the bottom of the tower body is communicated with the recycling box, the stirring mechanism is connected with one side of the recycling box, the recycling box is connected with the liquid storage box for storing liquid storage desulfurization slurry through a first one-way valve, and the liquid storage box is connected with the second conveying frame through a second one-way valve. The liquid storage tank is communicated with the tower body through a second one-way valve, a second conveying pipe is connected to the liquid storage tank, and a plurality of second spraying heads are arranged on the second conveying pipe. The method has the advantage that the processing cost is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of desulfurization of coal-fired units, and in particular relates to an energy-saving desulfurization slurry circulation pump system for coal-fired units. Background Art

[0002] At present, most coal-fired cogeneration units have adopted a number of energy-saving measures. After the cold-end loss is basically eliminated, reducing the exhaust loss has become the part with the greatest energy-saving potential for the unit. Recovering the flue gas waste heat to reduce the exhaust temperature and reduce the exhaust loss can effectively improve the energy efficiency of the unit. Flue gas waste heat recovery mainly adopts the method of partition heat exchanger. Since coal-fired flue gas is ash-containing and acidic, it is easy to cause wear and corrosion of the heat exchanger, and the reliability of the equipment is mostly poor. The existing device directly discharges the desulfurization slurry after desulfurization treatment, and does not recycle it, resulting in a waste of part of the desulfurization slurry, and it is difficult to reduce its processing cost, which is not conducive to energy conservation and emission reduction. Summary of the invention

[0003] The purpose of the present invention is to solve the above problems in the prior art and to propose an energy-saving coal-fired unit desulfurization slurry circulation pump system, which has the advantage of reducing processing costs.

[0004] The object of the present invention can be achieved by the following technical solutions: an energy-saving coal-fired unit desulfurization slurry circulation pump system, comprising a tower body, a recirculating desulfurization slurry device and a spraying device, wherein the recirculating desulfurization slurry device is connected to the tower body;

[0005] The spray device includes a water storage tank, a first conveying pipe, a first conveying frame and a first spray head, wherein the water storage tank is connected to the first conveying pipe, the first conveying pipe is connected to the first conveying frame, and a plurality of first spray heads are arranged on the first conveying frame;

[0006] The recirculating desulfurization slurry device comprises a stirring mechanism, a recirculation tank, a liquid storage tank and a second conveying frame, the bottom of the tower body is connected to the recirculation tank, the stirring mechanism is connected to one side of the recirculation tank, the recirculation tank is connected to the liquid storage tank for storing the liquid desulfurization slurry through a first one-way valve, the liquid storage tank is connected to the tower body through a second one-way valve, the liquid storage tank is connected to a second conveying pipe, and a plurality of second spray heads are arranged on the second conveying pipe;

[0007] A demisting mechanism for removing dust and mist is also installed directly above the spray device and the second conveying rack;

[0008] The tower body also includes a heat exchanger, a drain pipe and an exhaust pipe. The exhaust pipe is provided with an exhaust outlet. A drain pump is installed on the drain pipe.

[0009] Preferably, the defogger mechanism comprises an upper mounting plate, a plurality of folding plates and a lower mounting plate, the upper mounting plate and the lower mounting plate are both mounted on the inner wall of the tower body, one end of the folding plate is connected to the upper mounting plate, and the other end of the folding plate is connected to the lower mounting plate, and a defogger curved channel is provided between one of the folding plates and another adjacent folding plate.

[0010] Preferably, the heat exchanger includes a water inlet pipe, a plurality of heat exchange tubes and a water outlet pipe, and the tower body also includes a first chamber. The heat exchange tubes are installed in the first chamber, enter through the water inlet pipe, exchange heat through the heat exchange tubes in the first chamber, and are discharged from the water outlet pipe.

[0011] Preferably, the stirring mechanism comprises a stirring body, on which a feed pipe and a driving motor are mounted, an output shaft of the driving motor is drivingly connected to a transmission rod, and a plurality of stirring rods are arranged around the transmission rod along the transmission rod as the center.

[0012] Preferably, the bottom of the tower body is provided with a drainage channel, and a third one-way valve is also installed on the drainage channel.

[0013] Preferably, a guide portion is provided on a side wall of the tower body close to the drain pipe.

[0014] Preferably, a detection device for detecting the concentration of the desulfurization slurry is also installed on the recirculation box, and the first one-way valve is driven to operate by the detection device.

[0015] Compared with the prior art, the advantages of the present invention are: by evenly neutralizing in the recycling box, discharging the desulfurization slurry into the liquid storage tank again through the first one-way valve, and then re-transporting the desulfurization slurry from the liquid storage tank to the second delivery pipe, and then spraying it out from the second spray head, it is beneficial to fully and cyclically use the desulfurization slurry for multiple times. On the one hand, it is beneficial to energy conservation and emission reduction, and on the other hand, it greatly reduces the cost of product processing, the processing quality is higher, and the self-circulation effect is good. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural diagram of the present invention.

[0017] Figure 2 It is a structural diagram of the defogger mechanism in the present invention.

[0018] Figure 3 It is a structural view of the stirring mechanism in the present invention.

[0019] In the figure, 2, tower body; 21, first chamber; 22, drainage channel; 23, third one-way valve; 31, water storage tank; 32, first delivery pipe; 33, first delivery rack; 34, first spray head; 41, recycling tank; 42, liquid storage tank; 43, second delivery rack; 44, first one-way valve; 45, second one-way valve; 46, second delivery pipe; 47, second spray head; 51, heat exchanger; 511, water inlet pipe; 512, heat exchange pipe; 513, water outlet pipe; 52, drainage pipe; 53, exhaust pipe; 54, exhaust outlet; 55, drainage pump; 61, upper mounting plate; 62, folding plate; 63, lower mounting plate; 64, demisting curved channel; 71, mixer body; 72, feed pipe; 73, drive motor; 74, transmission rod; 75, stirring rod; 76, guide part; 8, detection device. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not 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.

[0021] like Figures 1 to 3 As shown, an energy-saving coal-fired unit desulfurization slurry circulation pump system includes a tower body 2, a recirculating desulfurization slurry device and a spray device, wherein the process water tank and the recirculating desulfurization slurry device are connected to the tower body 2;

[0022] The spray device includes a water storage tank 31, a first conveying pipe 32, a first conveying frame 33 and a first spray head 34. The water storage tank 31 is connected to the first conveying pipe 32, the first conveying pipe 32 is connected to the first conveying frame 33, and a plurality of first spray heads 34 are arranged on the first conveying frame 33.

[0023] The recirculating desulfurization slurry device includes a stirring mechanism, a recirculation tank 41, a liquid storage tank 42 and a second conveying frame 43. The bottom of the tower body 2 is connected to the recirculation tank 41, and the stirring mechanism is connected to one side of the recirculation tank 41. The recirculation tank 41 is connected to the liquid storage tank 42 for storing the liquid desulfurization slurry through a first one-way valve 44. The liquid storage tank 42 is connected to the tower body 2 through a second one-way valve 45. The liquid storage tank 42 is connected to a second conveying pipe 46, and a plurality of second spray heads 47 are provided on the second conveying pipe 46.

[0024] A demisting mechanism for removing dust and mist is also installed directly above the spray device and the second conveying frame 43;

[0025] The tower body 2 further includes a heat exchanger 51 , a drain pipe 52 and an exhaust pipe 53 . The exhaust pipe 53 has an exhaust outlet 54 . A drain pump 55 is installed on the drain pipe 52 .

[0026] With the above structure, the process water in the water storage tank 31 on one side of the tower body 2 passes through the first conveying pipe 32 and is sprayed out from the first spray head 34. At the same time, the desulfurization slurry in the liquid storage tank 42 storing the desulfurization slurry is also sprayed out from the second spray head 47 arranged on the second conveying frame 43 through the second one-way valve 45, and the desulfurization slurry is flashed. The flash steam moves upward under the action of the pressure difference, and some dust and other mist mixed in the flash steam are removed by the demisting mechanism, and then enters the right side of the first wall of the tower body 2. The heat released by the flash steam when passing through the tower body 2 is exchanged by the heat exchanger 51 passing through, and the flash steam heats the cold water in the heat exchanger 51 to become It is hot water. After the desulfurization slurry droplets flash, they are cooled to form cold slurry droplets, which fall into the left side of the tower body 2 and are transported to the circulation box. Since the content of cold slurry droplets in the recycling box 41 is lower than the predetermined content, some desulfurization slurry can be added through the stirring mechanism, and neutralized evenly in the recycling box 41, and then discharged into the liquid storage tank 42 through the first one-way valve 44. The desulfurization slurry is transported from the liquid storage tank 42 to the second delivery pipe 46, and then sprayed out by the second spray head 47. This is conducive to multiple, sufficient and recycled use of the desulfurization slurry. On the one hand, it is conducive to energy conservation and emission reduction. On the other hand, it greatly reduces the cost of product processing, with higher processing quality and better self-circulation effect.

[0027] Specifically, if Figures 1 to 3 As shown, the defogger mechanism includes an upper mounting plate 61, a plurality of folding plates 62 and a lower mounting plate 63. The upper mounting plate 61 and the lower mounting plate 63 are both mounted on the inner wall of the tower body 2. One end of the folding plate 62 is connected to the upper mounting plate 61, and the other end of the folding plate 62 is connected to the lower mounting plate 63. A defogger curved channel 64 is also provided between one of the folding plates 62 and another adjacent folding plate 62.

[0028] The above structure is adopted, through the provision of a plurality of folding plates 62 and a demisting curved channel 64, which is conducive to more efficient demisting processing. Moreover, through the demisting curved channel 64, the flash steam can remove most of the dust and other mist after passing through the demisting curved channel 64, which is conducive to effective automatic demisting.

[0029] like Figures 1 to 3 As shown, the heat exchanger 51 includes an inlet pipe 511, a plurality of heat exchange pipes 512 and an outlet pipe 513. The tower body 2 also includes a first chamber 21. The heat exchange pipes 512 are installed in the first chamber 21, enter the first chamber 21 through the inlet pipe 511, exchange heat through the heat exchange pipes 512 in the first chamber 21, and are discharged from the outlet pipe 513.

[0030] The heat exchanger 51 absorbs the heat of the flash steam, and the absorbed heat can make the water outlet pipe 513 hot water, which is conducive to fully utilizing the heat and transferring it to other places where the heat is needed, which is conducive to fully utilizing the energy and recycling it to the greatest extent.

[0031] like Figures 1 to 3 As shown, the stirring mechanism includes a stirring body 71, on which a feed pipe 72 and a drive motor 73 are installed. The output shaft of the drive motor 73 is connected to a transmission rod 74, and a plurality of stirring rods 75 are arranged around the transmission rod 74 as the center.

[0032] The driving motor 73 drives the stirring rod 75 to rotate, which is conducive to fully stirring the desulfurization slurry added to the stirring machine body 71 and stirring more evenly.

[0033] like Figures 1 to 3 As shown, the bottom of the tower body 2 is provided with a drainage channel 22 , and a third one-way valve 23 is also installed on the drainage channel 22 .

[0034] Through the third one-way valve 23, the water droplets formed by cooling on the right side of the first chamber 21 of the tower body 2 can be discharged from the drainage channel 22, which is more convenient and quick.

[0035] like Figures 1 to 3 As shown, the tower body 2 has a guide portion 76 on one side wall close to the drain pipe 52. The guide portion 76 is provided to facilitate guiding the water droplets formed by cooling.

[0036] like Figures 1 to 3 As shown, the recirculation box 41 is also equipped with a detection device 8 for detecting the concentration of the desulfurized slurry, and the first one-way valve 44 is driven to operate by the detection device 8 .

[0037] In the present invention, the detection device 8 is a prior art.

[0038] By providing the detection device 8 , the change of the concentration of the desulfurization slurry in the recirculation box 41 can be monitored in real time, which is convenient for real-time observation and for the operator to control the desulfurization slurry in the stirring mechanism to be poured into the recirculation box 41 .

[0039] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0040] In addition, the descriptions of "first", "second", etc. in the present invention are only used for descriptive purposes and cannot be understood as indicating or implying their 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. At the same time, the meaning of "and / or" appearing in the full text is that it includes three schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0041] The above components are all common standard parts or components known to those skilled in the art, and their structures and principles can be known to those skilled in the art through technical manuals or conventional experimental methods.

[0042] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. An energy-saving coal-fired unit desulfurization slurry circulation pump system, comprising a tower body (2), a recirculating desulfurization slurry device and a spraying device, wherein the recirculating desulfurization slurry device is connected to the tower body (2); The spray device comprises a water storage tank (31), a first conveying pipe (32), a first conveying frame (33) and a first spray head (34); the water storage tank (31) is connected to the first conveying pipe (32); the first conveying pipe (32) is connected to the first conveying frame (33); and a plurality of first spray heads (34) are arranged on the first conveying frame (33); The recirculating desulfurization slurry device comprises a stirring mechanism, a recirculation tank (41), a liquid storage tank (42) and a second conveying frame (43); the bottom of the tower body (2) is connected to the recirculation tank (41); the stirring mechanism is connected to one side of the recirculation tank (41); the recirculation tank (41) is connected to a liquid storage tank (42) for storing liquid desulfurization slurry via a first one-way valve (44); the liquid storage tank (42) is connected to the tower body (2) via a second one-way valve (45); the liquid storage tank (42) is connected to a second conveying pipe (46); and a plurality of second spray heads (47) are provided on the second conveying pipe (46); A demisting mechanism for removing dust and mist is also installed directly above the spray device and the second conveying frame (43); The tower body (2) further comprises a heat exchanger (51), a drainage pipe (52) and an exhaust pipe (53); the exhaust pipe (53) is provided with an exhaust outlet (54); and a drainage pump (55) is installed on the drainage pipe (52).

2. The energy-saving coal-fired unit desulfurization slurry circulation pump system according to claim 1 is characterized in that: The demisting mechanism comprises an upper mounting plate (61), a plurality of folding plates (62) and a lower mounting plate (63); the upper mounting plate (61) and the lower mounting plate (63) are both mounted on the inner side wall of the tower body (2); one end of the folding plate (62) is connected to the upper mounting plate (61), and the other end of the folding plate (62) is connected to the lower mounting plate (63); a demisting curved channel (64) is also provided between one of the folding plates (62) and another adjacent folding plate (62).

3. The energy-saving coal-fired unit desulfurization slurry circulation pump system according to claim 1 is characterized in that: The heat exchanger (51) comprises a water inlet pipe (511), a plurality of heat exchange pipes (512) and a water outlet pipe (513); the tower body (2) further comprises a first chamber (21); the heat exchange pipes (512) are installed in the first chamber (21); water enters the first chamber (21) through the water inlet pipe (511), exchanges heat through the heat exchange pipes (512) in the first chamber (21), and is then discharged from the water outlet pipe (513).

4. The energy-saving coal-fired unit desulfurization slurry circulation pump system according to claim 1 is characterized in that: The stirring mechanism comprises a stirring machine body (71), on which a feed pipe (72) and a driving motor (73) are mounted, and an output shaft of the driving motor (73) is connected to a transmission rod (74) in a transmission manner, and a plurality of stirring rods (75) are arranged around the transmission rod (74) along the transmission rod (74) as the center.

5. The energy-saving coal-fired unit desulfurization slurry circulation pump system according to claim 1 is characterized in that: The bottom of the tower body (2) is provided with a liquid discharge channel (22), and a third one-way valve (23) is also installed on the liquid discharge channel (22).

6. The energy-saving coal-fired unit desulfurization slurry circulation pump system according to claim 1 is characterized in that: A guide portion (76) is provided on a side wall of the tower body (2) close to the drainage pipe (52).

7. The energy-saving coal-fired unit desulfurization slurry circulation pump system according to claim 1 is characterized in that: The recirculation box (41) is also equipped with a detection device (8) for detecting the concentration of the desulfurized slurry, and the first one-way valve (44) is driven to operate by the detection device (8).

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