Thermal power generation desulfurization wastewater treatment and recycling device

Abstract

The invention provides a thermal power generation desulfurization wastewater treatment and recycling device, and relates to the field of desulfurization wastewater treatment. The thermal power generation desulfurization wastewater treatment and recycling device comprises a flue, a stop ring mounted at the upper end of the flue, a spiral blade mounted on the inner wall of the flue, and a preheating box, a water inlet end and a water outlet end are mounted on the side face of the preheating box, the water inlet end is located above the water outlet end, and diffusion equipment is mounted at the water outlet end. The heat exchange mechanism is installed in the preheating box, a steering pipe is installed at the air inlet end of the heat exchange mechanism, and the other end of the steering pipe is connected with the bottom end of the side face of the flue. According to the thermal power generation desulfurization wastewater treatment and recycling device, the heat exchange mechanism and the flue are arranged, high-temperature waste gas in the flue can blow away desulfurization wastewater upwards from the bottom, then the desulfurization wastewater is evaporated and crystallized and falls to the bottom of the flue to be collected, and the effects of high-efficiency heat exchange and high flue crystallization rate can be achieved.

Description

Technical Field

[0001] The present invention relates to the field of desulfurization wastewater treatment, and in particular to a device for treating and reusing desulfurization wastewater from thermal power generation. Background Art

[0002] It is extremely difficult to treat the wastewater generated by wet desulfurization in thermal power plants. Common methods include evaporation and crystallization, spray drying, and spraying the desulfurization wastewater into a higher temperature flue (after the air preheater) to evaporate the salt in the desulfurization wastewater into powder, which is then captured by the dust collector along with the smoke and recycled.

[0003] Chinese Patent Publication (Announcement) No.: CN206173007U discloses a device that uses hot water to heat the desulfurization wastewater for evaporation in a spray cooling tower, and collects the desulfurization wastewater into a concentration tank; a circulating pump pumps the desulfurization wastewater in the concentration tank to a plastic heat exchanger; the desulfurization wastewater is heated to a certain temperature in the plastic heat exchanger, and then enters the spray cooling tower, where it is sprayed into fine particles from the spray cooling tower nozzle and falls down. The steam evaporates from the upper part of the spray cooling tower, and the concentrated desulfurization wastewater enters the spray cooling tower water pool, where salt is crystallized by heating and evaporation.

[0004] In the process of treating wastewater, the device that uses hot water to heat the desulfurization wastewater for evaporation in the spray cooling tower has a low heat exchange efficiency of the plastic heat exchanger and is prone to scaling. In addition, the heated desulfurization wastewater has a slow temperature rise rate in the flue, so that the wastewater is still in a liquid state after falling. Summary of the Invention

[0005] In view of the shortcomings of the existing technology, the present invention provides a device for treating and reusing desulfurization wastewater from thermal power generation, which solves the problems raised in the above background technology.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: a thermal power generation desulfurization wastewater treatment and reuse device, including a flue, a cut-off ring is installed at the upper end of the flue, spiral blades are installed on the inner wall of the flue, and a preheating box is also included. A water inlet and a water outlet are installed on the side of the preheating box, the water inlet is above the water outlet, and a diffusion device is installed at the water outlet, and the other end of the diffusion device is connected to the middle side wall of the flue. It also includes a heat exchange mechanism installed in the preheating box, a steering pipe is installed at the air inlet end of the heat exchange mechanism, and the other end of the steering pipe is connected to the bottom end of the side of the flue, an exhaust pipe is installed at the bottom of the heat exchange mechanism, and the other end of the exhaust pipe is connected to the bottom end of the side of the flue.

[0007] Preferably, the heat exchange mechanism includes a heat conducting pipe, which is annular and has a pleated side surface, capable of contracting and expanding; includes a plurality of expansion pipes, which are annularly distributed in the heat conducting pipe and are located in the pleats of the heat conducting pipe, with their sides fixed to the heat conducting pipe. After the expansion pipe is filled with water, the pleats of the heat conducting pipe can be pushed open; and also includes two air cavities, which are respectively located on the upper and lower sides of the heat conducting pipe. Elastic tubes communicating with the interior of the expansion pipe are installed at both upper and lower ends of the expansion pipe, and the other end of the elastic tube is installed on and communicated with the corresponding air cavity. The two air cavities are respectively connected to the upper and lower ends of the preheating box.

[0008] Preferably, an air intake pipe is installed on the upper air cavity, a central tube is installed on one end of the air intake pipe close to the air cavity, and the steering tube is connected to the side of the central tube and communicated with the interior of the central tube.

[0009] Preferably, the heat conduction pipe is suspended in the preheating box, and the desulfurization wastewater entering the water inlet can pass through the inner and outer sides of the preheating box respectively.

[0010] Preferably, the diffusion device includes a water spray pipe and a diversion pipe, one end of the water spray pipe is connected to the water outlet end, and the other end is connected to the flue. There are multiple diversion pipes, one end of which is connected to the water spray pipe and the other end is connected to the flue. The multiple diversion pipes are arranged longitudinally and are used to divert the desulfurization wastewater inside the water spray pipe.

[0011] Preferably, a tapered tube is provided between the water outlet and the water spray pipe, the large end of the tapered tube is connected to the water outlet, and the small end is connected to the water spray pipe.

[0012] Preferably, the locations where the diversion pipe and the water spray pipe are connected to the flue all correspond to spiral blades.

[0013] Preferably, the spiral blade is annular, and its upper end extends to the top of the flue.

[0014] Preferably, a shrink tube is installed at the bottom end of the flue.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. The thermal power generation desulfurization wastewater treatment and reuse device is provided with a heat exchange mechanism and a flue. The desulfurization wastewater can be discharged into the flue after passing through the preheating box, and a part of the high-temperature flue gas in the flue is first separated and filled into the expansion tube, and then enters the flue, and the other part of the high-temperature flue gas directly enters the flue. The flue gas entering the expansion tube can heat the heat conducting tube, so that the high-temperature expansion tube and the heat conducting tube can heat the desulfurization wastewater inside the preheating box. The heated wastewater can enter the flue through the diffusion device, and the high-temperature exhaust gas in the flue can blow the desulfurization wastewater upward from the bottom, and then evaporate and crystallize and fall to the bottom of the flue for collection. After the external structure of the heat conducting tube is closed, the air cavity valve at the bottom is closed, and the expansion tube continues to expand and become larger by being inflated, so that multiple expansion tubes can support the heat conducting tube, and the scaling on the outside can be removed, thereby continuing to maintain the effect of preheating the wastewater, and achieving high-efficiency heat exchange and fast crystallization rate of the flue.

[0017] 2. The thermal power generation desulfurization wastewater treatment and reuse device is equipped with spiral blades. The wastewater entering the flue will be divided into multiple streams and then blown away by the high-temperature flue gas. At this time, the flue gas carries water mist and spirally rises along the spiral blades, which can increase the heating time. The water mist is evaporated before it is completely discharged from the flue. Moreover, since the wastewater has been preheated in the early stage and divided into multiple streams, it is not easy to fall downward.

[0018] 3. The thermal power generation desulfurization wastewater treatment and reuse device is equipped with a water spray pipe. The wastewater preheated in the preheating box can pass through the tapered pipe, thereby being converted into water mist with faster flow rate and better diffusion effect. The gaps between water molecules are increased, and it is easy to be heated. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of the present invention;

[0020] Figure 2 It is a cross-sectional view of the structure of the present invention;

[0021] Figure 3 FIG. 1 is a diagram showing the internal structure of the flue of the present invention;

[0022] Figure 4 It is a structural schematic diagram of the preheating box of the present invention;

[0023] Figure 5 Schematic diagram of the structure of the heat exchange mechanism of the present invention;

[0024] Figure 6 This is an exploded view of the heat exchange mechanism of the present invention;

[0025] Figure 7 For the present invention Figure 6 A magnified view of the structure in Figure 2.

[0026] In the figure: 1. Flue; 2. Cut-off ring; 3. Spiral blade; 4. Preheating box; 5. Water inlet; 6. Water outlet; 7. Diffusion device; 701. Water spray pipe; 702. Diverter pipe; 703. Conical pipe; 8. Heat exchange mechanism; 801. Heat conduction pipe; 802. Expansion pipe; 803. Air cavity; 804. Elastic pipe; 805. Inlet pipe; 806. Central pipe; 9. Steering pipe; 10. Exhaust pipe; 11. Contraction pipe. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0028] It should be noted that all directional indications in the embodiments of the present application are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0029] In this application, unless otherwise specified or limited, the terms "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can mean fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. For those skilled in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0030] In addition, the descriptions of "first", "second", etc. in this application are for descriptive purposes only and should not be understood as indicating or implying their relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0031] like Figure 1-Figure 7As shown, a thermal power generation desulfurization wastewater treatment and reuse device includes a flue 1, a cut-off ring 2 is installed at the upper end of the flue 1, a spiral blade 3 is installed on the inner wall of the flue 1, and a preheating box 4 is also included. A water inlet end 5 and a water outlet end 6 are installed on the side of the preheating box 4, the water inlet end 5 is above the water outlet end 6, and the water outlet end 6 is installed with a diffusion device 7, the other end of the diffusion device 7 is connected to the middle side wall of the flue 1, and also includes a heat exchange mechanism 8, which is installed in the preheating box 4, and a steering pipe 9 is installed at the air inlet end of the heat exchange mechanism 8, and the other end of the steering pipe 9 is connected to the bottom end of the side of the flue 1. An exhaust pipe 10 is installed at the bottom of the heat exchange mechanism 8, and the other end of the exhaust pipe 10 is connected to the bottom end of the side of the flue 1.

[0032] The flue 1 is vertically positioned and must be a certain length to ensure maximum utilization of the heat from the high-temperature flue gas. The shutoff ring 2 prevents the flue gas from being siphoned and flowing too fast. The water inlet 5 of the preheating tank 4 is connected to the desulfurization wastewater pump and tank or upstream treatment equipment. The water inlet 5 is located at the top, allowing the heated wastewater to flow downward, ensuring heat balance throughout the preheating tank 4.

[0033] The heat exchange mechanism 8 includes a heat pipe 801, which is annular and has a corrugated side surface, capable of contracting and expanding; it includes a plurality of expansion pipes 802, which are annularly distributed within the heat pipe 801 and located within the corrugations of the heat pipe 801. The side surfaces of the expansion pipes 802 are fixed to the heat pipe 801, and the corrugations of the heat pipe 801 can be pushed open after the expansion pipes 802 are filled with water; it also includes two air cavities 803, located on the upper and lower sides of the heat pipe 801, respectively. Elastic tubes 804 communicating with the interior of the expansion pipe 802 are installed at the upper and lower ends of the expansion pipe 802, and the other ends of the elastic tubes 804 are installed on and communicated with the corresponding air cavities 803. The two air cavities 803 are respectively connected to the upper and lower ends of the preheating box 4.

[0034] The heat conducting tube 801 can be made of high temperature resistant plastic material, which is not easy to scale. Even after scaling, it can be deformed to cause the scaling to collapse. The expansion tube 802 is also made of high temperature resistant elastically deformable material and can expand after inflation. The elastic tube 804 is a soft tube and can be deformed.

[0035] An air inlet pipe 805 is installed on the upper air cavity 803 , and a central tube 806 is installed on one end of the air inlet pipe 805 close to the air cavity 803 . The steering tube 9 is connected to the side of the central tube 806 and communicates with the interior thereof.

[0036] The central pipe 806 is mainly used to divert high-temperature hot air, transferring most of it to the flue 1, and a small part is used to heat the wastewater.

[0037] The heat conducting pipe 801 is suspended in the preheating box 4 , and the desulfurized wastewater entering the water inlet 5 can pass through the inner and outer sides of the preheating box 4 respectively.

[0038] The suspended heating method can quickly heat up the wastewater. The pleated structure of the two is more efficient in transferring heat and the heat exchange is frequent.

[0039] The diffusion device 7 includes a water spray pipe 701 and a diversion pipe 702. One end of the water spray pipe 701 is connected to the water outlet 6, and the other end is connected to the flue 1. There are multiple diversion pipes 702, one end of which is connected to the water spray pipe 701, and the other end is connected to the flue 1. The multiple diversion pipes 702 are arranged longitudinally and are used to divert the desulfurization wastewater inside the water spray pipe 701.

[0040] The water spray pipe 701 and the diversion pipe 702 are both relatively thin, and the high-pressure water pumped in can be diffused into a water mist state. In order to ensure the spray quality, a nozzle can also be installed at the water spray end in the flue 1, and the nozzle needs to be anti-blocking.

[0041] A tapered tube 703 is provided between the water outlet end 6 and the water spray pipe 701 . The large end of the tapered tube 703 is connected to the water outlet end 6 , and the small end is connected to the water spray pipe 701 .

[0042] Used to increase flow rate and disperse wastewater after heating.

[0043] The positions where the diversion pipe 702 and the water spray pipe 701 are connected to the flue 1 all correspond to the spiral blades 3.

[0044] The spiral blade 3 is annular, and its upper end extends to the top end of the flue 1 .

[0045] The spiral blades 3 can exchange heat in the flue gas with the waste water as much as possible.

[0046] A shrink tube 11 is installed at the bottom end of the flue 1 .

[0047] The shrink tube 11 is used to collect the fallen salt residue and dust in the flue gas.

[0048] During use, the desulfurized wastewater is transported by a water pump and can be discharged into the flue 1 after passing through the preheating box 4. A small part of the high-temperature flue gas in the flue 1 is first separated and filled into the expansion tube 802, and then enters the flue 1. The other part of the high-temperature flue gas directly enters the flue 1. The flue gas entering the expansion tube 802 can heat the heat pipe 801, so that the high-temperature expansion tube 802 and the heat pipe 801 can heat the desulfurized wastewater inside the preheating box 4. The wastewater after heating can enter the flue 1 through the diffusion device 7. The wastewater entering the flue 1 will be divided into multiple streams and then blown away by the high-temperature flue gas. At this time, the flue gas spirally rises along the spiral blade 3 with water mist, which can increase the heating time. The water mist is evaporated before it is completely discharged from the flue 1. The high-temperature waste gas in the flue 1 can blow the desulfurization wastewater upward from the bottom, and then the evaporated crystals fall to the bottom of the flue 1 for collection. After the external structure of the heat pipe 801 is formed, the valve of the air cavity 803 at the bottom is closed, and the expansion tube 802 continues to expand and become larger by inflating, so that multiple expansion tubes 802 can support the heat pipe 801 and the external scaling can be removed.

[0049] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" 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 application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification.

[0050] In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the fact that ordinary technicians in this field can implement them. When the combination of technical solutions is mutually 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 this application.

[0051] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A thermal power generation desulfurization wastewater treatment and reuse device, comprising a flue (1), characterized in that: The flue (1) is provided with a cut-off ring (2) at the upper end, a spiral blade (3) at the inner wall of the flue (1), and a preheating box (4). A water inlet (5) and a water outlet (6) are provided on the side of the preheating box (4). The water inlet (5) is located above the water outlet (6). The water outlet (6) is provided with a diffusion device (7). The other end of the diffusion device (7) is connected to the side wall of the middle portion of the flue (1). The flue (1) also includes a heat exchange mechanism (8) which is provided in the preheating box (4). A steering pipe (9) is provided at the air inlet end of the heat exchange mechanism (8). The other end of the steering pipe (9) is connected to the bottom end of the side of the flue (1). An exhaust pipe (10) is provided at the bottom of the heat exchange mechanism (8). The other end of the exhaust pipe (10) is connected to the bottom end of the side of the flue (1).

2. The thermal power generation desulfurization wastewater treatment and reuse device according to claim 1, characterized in that: The heat exchange mechanism (8) comprises a heat conducting pipe (801) which is annular and has a pleated side surface, capable of contraction and expansion; a plurality of expansion pipes (802) which are annularly distributed in the heat conducting pipe (801) and located in the pleats of the heat conducting pipe (801), with the side surfaces of the expansion pipes (802) fixed to the heat conducting pipe (801); and the expansion pipes (802) can push open the pleats of the heat conducting pipe (801) after being filled with water; and two air cavities (803) which are located at the upper and lower sides of the heat conducting pipe (801), respectively. The upper and lower ends of the expansion pipe (802) are both installed with elastic pipes (804) in communication with the interior thereof, and the other ends of the elastic pipes (804) are installed on and in communication with the corresponding air cavities (803). The two air cavities (803) are respectively connected to the upper and lower ends of the preheating box (4).

3. The thermal power generation desulfurization wastewater treatment and reuse device according to claim 2, characterized in that: An air inlet pipe (805) is installed on the upper air cavity (803), and a central tube (806) is installed at one end of the air inlet pipe (805) close to the air cavity (803). The steering tube (9) is connected to the side of the central tube (806) and communicates with the interior thereof.

4. The thermal power generation desulfurization wastewater treatment and reuse device according to claim 3, characterized in that: The heat conducting pipe (801) is suspended in the preheating box (4), and the desulfurization wastewater entering from the water inlet (5) can pass through both the inner and outer sides of the preheating box (4).

5. The thermal power generation desulfurization wastewater treatment and reuse device according to claim 1, characterized in that: The diffusion device (7) comprises a water spray pipe (701) and a diversion pipe (702). One end of the water spray pipe (701) is connected to the water outlet (6), and the other end is connected to the flue (1). A plurality of diversion pipes (702) are provided, one end of which is connected to the water spray pipe (701), and the other end of which is connected to the flue (1). The plurality of diversion pipes (702) are arranged and distributed longitudinally and are used to divert the desulfurization wastewater inside the water spray pipe (701).

6. The thermal power generation desulfurization wastewater treatment and reuse device according to claim 5, characterized in that: A tapered tube (703) is provided between the water outlet end (6) and the water spray pipe (701), wherein the large end of the tapered tube (703) is connected to the water outlet end (6), and the small end is connected to the water spray pipe (701).

7. The thermal power generation desulfurization wastewater treatment and reuse device according to claim 6, characterized in that: The positions where the diversion pipe (702) and the water spray pipe (701) are connected to the flue (1) both correspond to the spiral blades (3).

8. The thermal power generation desulfurization wastewater treatment and reuse device according to claim 7, characterized in that: The spiral blade (3) is annular, and its upper end extends to the top end of the flue (1).

9. The thermal power generation desulfurization wastewater treatment and reuse device according to claim 1, characterized in that: A shrink tube (11) is installed at the bottom end of the flue (1).

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