A coal-fired power plant flue gas desulfurization wastewater evaporation recovery device

Abstract

The present invention discloses a flue gas desulfurization wastewater evaporation and recovery device for a coal-fired power plant, comprising a waste gas treatment box and a waste gas intake pipe, wherein the waste gas intake pipe is inserted into the side wall of the waste gas treatment box, and a plurality of gas distribution pipes are provided at the end of the waste gas intake pipe, wherein a plurality of air holes are provided on the gas distribution pipes, and a one-way exhaust valve is fixed in the air holes to facilitate the discharge of sulfur-containing waste gas. The present invention uses water to react with sulfides in sulfur-containing flue gas to form sulfurous acid, while nitrogen and carbon dioxide in the flue gas are discharged. When an electric hydraulic cylinder is turned on, a push plate at the end can be pushed to move. A plurality of linearly arranged water seepage holes are provided at the bottom of the push plate, so that when the first push rod is pushed, the second push rod will also be moved. Since the slider slides vertically on the slide rail, the push plate can be ensured to slide on the second inclined plate, and the setting of the water seepage holes can ensure that the wastewater containing sulfurous acid and the wastewater after the reaction of calcium carbonate flows out along the water seepage holes.

Description

Technical Field

[0001] The present invention relates to the technical field of flue gas desulfurization, and in particular to a flue gas desulfurization wastewater evaporation and recovery device for a coal-fired power plant. Background Art

[0002] Currently, most power plants use coal-fired power generation. The flue gas generated passes from the bottom of the absorption tower upward through the absorption area. Desulfurization water is continuously circulated in the absorption tower to complete the absorption process of SO2 in the flue gas. However, the continuous circulation of desulfurization water causes the continuous concentration of soluble salts, which will produce desulfurization wastewater with complex components, high turbidity and high salt content. It is highly corrosive and prone to scaling. The treatment of desulfurization wastewater has become a key factor restricting the zero discharge of wastewater from thermal power plants.

[0003] Traditional desulfurization wastewater is often difficult to recycle, which will result in a large amount of water waste. At the same time, the sulfides it contains are difficult to collect and clean.

[0004] To this end, we designed a flue gas desulfurization wastewater evaporation and recovery device for coal-fired power plants. Summary of the Invention

[0005] The purpose of the present invention is to solve the problem that desulfurization wastewater is often difficult to recycle, and to propose a coal-fired power plant flue gas desulfurization wastewater evaporation and recovery device.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] The exhaust gas fan of the gas heating unit is connected with the exhaust gas fan of the gas reversing device, and the exhaust gas fan of the gas reversing device is connected with the exhaust gas fan of the gas reversing device.

[0008] Preferably, the flue gas treatment mechanism includes:

[0009] A plurality of water storage tanks, wherein the plurality of water storage tanks are linearly arranged and fixed to the exhaust pipe, and a water spray head connected to the water storage tank is provided at the bottom of the water storage tank;

[0010] The condensation water tank is arranged in a circle shape and is fixed to the outer side wall of the exhaust pipe. The condensation water tank is connected to the water storage tank.

[0011] Preferably, the first inclined plate and the second inclined plate are not parallel to each other.

[0012] Preferably, the material pushing and liquid seepage mechanism comprises:

[0013] An electric hydraulic cylinder, the electric hydraulic cylinder is fixed to the inner wall of the exhaust gas treatment box, and a first push rod is fixed to the output end of the electric hydraulic cylinder;

[0014] A slide rail, wherein the slide rail is fixed to the end of the first push rod, and a slider is vertically slidable in the slide rail;

[0015] A push plate is provided with a second push rod fixed on the side of the push plate facing the electric hydraulic cylinder. The second push rod slides vertically on the slide rail through a slider. A plurality of linearly arranged water seepage holes are provided at the bottom of the push plate.

[0016] Preferably, the second inclined plate and the side of the pusher plate opposite to the electric hydraulic cylinder is a reaction zone, and calcium carbonate for reacting with sulfide is laid in the reaction zone.

[0017] Preferably, the water vapor evaporation mechanism comprises:

[0018] A plurality of electric heating wires, wherein the plurality of electric heating wires are linearly arranged on the inner wall of the evaporation box and are not connected to the bottom of the evaporation box;

[0019] A discharge pipe is inserted into the bottom of the evaporation box, and a valve for controlling liquid outflow is provided on the outer wall of the evaporation box;

[0020] A communicating air pipe is provided on the side wall of the discharge pipe with a steam outlet, one end of the communicating air pipe is connected to the evaporation box through the steam outlet, and the other end of the communicating air pipe is connected to the flue gas treatment mechanism.

[0021] Preferably, the connecting hose is filled with filter cotton for filtering wastewater residue.

[0022] The beneficial effects of the present invention are:

[0023] 1. The present invention uses water to react with sulfides in sulfur-containing flue gas to form sulfurous acid, while nitrogen and carbon dioxide in the flue gas will be discharged. Turning on the electric hydraulic cylinder can push the push plate at the end to move. A plurality of linearly arranged water seepage holes are provided at the bottom of the push plate, so that when the first push rod is pushed, the second push rod will also move. Since the slider slides vertically on the slide rail, it can ensure that the push plate slides on the second inclined plate, and the setting of the water seepage holes can ensure that the wastewater containing sulfurous acid reacts with calcium carbonate and flows out along the water seepage holes.

[0024] 2. The present invention uses the reaction of sulfurous acid and calcium carbonate to generate a calcium sulfite solution, which can effectively convert the sulfide and turn the originally acidic solution into a non-acidic solution. The pusher plate continuously pushes the calcium carbonate back and forth to move upward on the second inclined plate, and continues to slide down after the pusher plate retracts, so that the calcium carbonate can be continuously turned under the action of the pusher plate, which can greatly improve the reaction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic structural diagram of a coal-fired power plant flue gas desulfurization wastewater evaporation and recovery device proposed by the present invention;

[0026] Figure 2 for Figure 1 Schematic diagram of the local structure in;

[0027] Figure 3 This is a front view of a coal-fired power plant flue gas desulfurization wastewater evaporation and recovery device proposed by the present invention;

[0028] Figure 4 This is a schematic structural diagram of an exhaust pipe in a flue gas desulfurization wastewater evaporation and recovery device for a coal-fired power plant proposed by the present invention;

[0029] Figure 5 This is a structural schematic diagram of the gas distribution pipe in a flue gas desulfurization wastewater evaporation recovery device for a coal-fired power plant proposed by the present invention.

[0030] In the figure: 1. Exhaust gas treatment box; 2. Filter; 3. Exhaust gas inlet pipe; 4. Gas distribution pipe; 5. One-way exhaust valve; 6. Box top cover; 7. Exhaust pipe; 8. Condensate tank; 9. Water storage tank; 10. Sprinkler head; 11. Connecting air pipe; 12. Steam exhaust outlet; 13. First inclined plate; 14. Second inclined plate; 15. Evaporation box; 16. Electric hydraulic cylinder; 17. Electric heating wire; 18. Discharge pipe; 19. Valve; 20. Connecting hose; 21. First push rod; 22. Slide rail; 23. Slider; 24. Second push rod; 25. Push plate; 26. Water seepage hole. DETAILED DESCRIPTION

[0031] Reference Figure 1-Figure 5A flue gas desulfurization wastewater evaporation and recovery device for a coal-fired power plant includes a waste gas treatment box 1 and a waste gas inlet pipe 3. The waste gas inlet pipe 3 is inserted into the side wall of the waste gas treatment box 1, and a plurality of gas distribution pipes 4 are provided at the end of the waste gas inlet pipe 3. This arrangement can effectively ensure that the sulfur-containing waste gas entering the waste gas inlet pipe 3 can be distributed to the plurality of gas distribution pipes 4, which can greatly improve the exhaust efficiency of the flue gas and the absorption efficiency of the flue gas.

[0032] There are multiple air holes on the air distribution pipe 4, and a one-way exhaust valve 5 is fixed in the air hole to facilitate the discharge of sulfur-containing waste gas. This setting can ensure the increase in the discharge amount of sulfur-containing flue gas to the greatest extent, and at the same time avoid water from flowing into the air distribution pipe 4 along the air holes and causing poor exhaust of the air distribution pipe 4. The added one-way exhaust valve 5 can effectively ensure the one-way flow of sulfur-containing flue gas, allowing the sulfur-containing flue gas to enter the waste gas treatment box 1 and then mix and react with the water sprayed above to form sulfurous acid, while the nitrogen and carbon dioxide in the flue gas will be discharged from the waste gas treatment box 1.

[0033] A filter screen 2 fixed to the inner wall of the exhaust gas treatment box 1 is provided below the exhaust gas inlet pipe 3. The presence of the filter screen 2 can effectively ensure that large particles in the flue gas fall into the subsequent reaction box and affect the subsequent reaction. Therefore, the designed filter screen 2 can effectively prevent debris from falling. A box top cover 6 and an evaporation box 15 are respectively provided on the top and bottom of the exhaust gas treatment box 1. An exhaust pipe 7 for discharging the treated flue gas in the exhaust gas treatment box 1 is vertically inserted on the box top cover 6. A flue gas treatment mechanism is provided in the exhaust pipe 7, wherein the box top cover 6 can gather the rising flue gas to the exhaust pipe 7 and discharge it after treatment.

[0034] Reference Figure 4 As shown, the flue gas treatment mechanism includes a plurality of water tanks 9, which are linearly arranged and fixed to the exhaust pipe 7. A water spray head 10 is provided at the bottom of the water tank 9 and is connected to the water tank 9. In this way, clean water in the water tank 9 can be sprayed out from the water spray head 10, and then the water reacts with the sulfide in the sulfur-containing flue gas to form sulfurous acid, while the nitrogen and carbon dioxide in the flue gas are discharged;

[0035] The flue gas treatment mechanism also includes a condensation water tank 8, which is arranged in a ring shape and is fixed to the outer wall of the exhaust pipe 7. The condensation water tank 8 is connected to the water storage tank 9, so that the condensed water in the condensation water tank 8 will flow into the water storage tank 9 and then be sprayed out along the sprinkler head 10.

[0036] The exhaust gas treatment box 1 is provided with a first inclined plate 13 arranged obliquely, and the evaporation box 15 is provided with a second inclined plate 14 above the exhaust gas treatment box 1 and the evaporation box 15. The first inclined plate 13 and the second inclined plate 14 are not parallel to each other. It should be noted that the first inclined plate 13 and the second inclined plate 14 are both inclined downward. Figure 3In this way, the wastewater containing sulfurous acid can be effectively introduced into the evaporation box 15, and the evaporation concentration of the sulfurous acid wastewater can be completed.

[0037] A material pushing and liquid seepage mechanism is provided below the first inclined plate 13. The material pushing and liquid seepage mechanism includes an electric hydraulic cylinder 16. The electric hydraulic cylinder 16 is fixed to the inner wall of the exhaust gas treatment box 1. A first push rod 21 is fixed to the output end of the electric hydraulic cylinder 16. When the electric hydraulic cylinder 16 is turned on, the push plate 25 at the end can be pushed to move.

[0038] The pushing and seepage mechanism also includes a slide rail 22 and a push plate 25. The slide rail 22 is fixed to the end of the first push rod 21, and a slider 23 slides vertically in the slide rail 22. A second push rod 24 is fixed to the push plate 25 on the side facing the electric hydraulic cylinder 16. The second push rod 24 slides vertically on the slide rail 22 through the slider 23. A plurality of linearly arranged seepage holes 26 are provided at the bottom of the push plate 25. In this way, when the first push rod 21 is pushed, the second push rod 24 will also move with it. Since the slider 23 slides vertically on the slide rail 22, the push plate 25 can be ensured to slide on the second inclined plate 14, and the setting of the seepage holes 26 can ensure that the wastewater containing sulfurous acid reacts with calcium carbonate and flows out along the seepage holes 26.

[0039] The reaction zone is located on the second inclined plate 14 and on the side of the electric hydraulic cylinder 16 opposite to the push plate 25, and calcium carbonate for reacting with sulfide is laid in the reaction zone. It should be noted that when sulfurous acid reacts with calcium carbonate to generate a calcium sulfite solution, the sulfide can be converted well, thereby converting the originally acidic solution into a non-acidic solution. The push plate 25 continuously pushes the calcium carbonate back and forth to move upward on the second inclined plate 14, and continues to slide down after the push plate 25 retracts, so that the calcium carbonate can be continuously flipped under the action of the push plate 25, which can greatly improve the reaction efficiency.

[0040] The exhaust gas treatment box 1 and the evaporation box 15 are connected by a detachable and replaceable connecting hose 20. The connecting hose 20 is filled with filter cotton for filtering wastewater residue. The filter cotton can effectively filter small calcium carbonate particles in the wastewater and prevent small calcium carbonate particles from entering the evaporation box 15.

[0041] A water vapor evaporation mechanism is provided in the evaporation box 15. The water vapor evaporation mechanism includes a plurality of electric heating wires 17. The plurality of electric heating wires 17 are linearly arranged on the inner wall of the evaporation box 15 and are not connected to the bottom of the evaporation box 15. In this way, the calcium sulfite solution can be heated by the heating electric heating wires 17 to evaporate the water vapor therein.

[0042] The water vapor evaporation mechanism also includes a discharge pipe 18, which is inserted into the bottom of the evaporation box 15. The outer wall of the evaporation box 15 is provided with a valve 19 for controlling the outflow of liquid. As the water vapor of the calcium sulfite solution evaporates, the concentrated calcium sulfite solution can be opened through the valve 19 and flow out of the evaporation box 15.

[0043] The water vapor evaporation mechanism also includes a connecting air pipe 11, and a steam exhaust port 12 is opened on the side wall of the discharge pipe 18. One end of the connecting air pipe 11 is connected to the evaporation box 15 through the steam exhaust port 12, and the other end of the connecting air pipe 11 is connected to the flue gas treatment mechanism. The water vapor generated by evaporation will enter the condensation water tank 8 along the connecting air pipe 11. The condensation water tank 8 can condense the water vapor into liquid water and use it for subsequent reactions, thereby achieving the effect of evaporating, recycling and reusing the desulfurization wastewater.

[0044] The working principle of the present invention is as follows: the sulfur-containing exhaust gas entering the exhaust gas inlet pipe 3 can be distributed to multiple gas distribution pipes 4. The added one-way exhaust valve 5 can effectively ensure the one-way flow of the sulfur-containing flue gas, allowing the sulfur-containing flue gas to enter the exhaust gas treatment box 1 and react with the water sprayed above to form sulfurous acid, while the nitrogen and carbon dioxide in the flue gas will be discharged from the exhaust gas treatment box 1;

[0045] Then the clean water in the water tank 9 is sprayed out from the sprinkler head 10, and then the water is allowed to react with the sulfide in the sulfur-containing flue gas to form sulfurous acid, while the nitrogen and carbon dioxide in the flue gas are discharged. The electric hydraulic cylinder 16 is turned on to push the push plate 25 at the end to move. A plurality of linearly arranged water seepage holes 26 are provided at the bottom of the push plate 25, so that when the first push rod 21 is pushed, the second push rod 24 is also moved. Since the slider 23 slides vertically on the slide rail 22, it can ensure that the push plate 25 slides on the second inclined plate 14, and the setting of the water seepage holes 26 can ensure that the wastewater containing sulfurous acid reacts with calcium carbonate and flows out along the water seepage holes 26;

[0046] When sulfurous acid reacts with calcium carbonate to form a calcium sulfite solution, the sulfide can be converted well, and the originally acidic solution can be turned into a non-acidic solution. The push plate 25 continuously pushes the calcium carbonate upward on the second inclined plate 14. After the push plate 25 retracts, it continues to slide down, which can make the calcium carbonate constantly flipped under the action of the push plate 25, which can greatly improve the reaction efficiency.

[0047] Finally, the electric heating wires 17 provided in the evaporation box 15 are arranged linearly on the inner wall of the evaporation box 15 and are not connected to the bottom of the evaporation box 15. In this way, the calcium sulfite solution can be heated by the heating electric heating wires 17 to evaporate the water vapor therein. The water vapor generated by the evaporation will enter the condensation water tank 8 along the connecting air pipe 11. The condensation water tank 8 can condense the water vapor into liquid water for subsequent reactions, thereby achieving the effect of evaporating and recycling the desulfurization wastewater.

[0048] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A coal-fired power plant flue gas desulfurization wastewater evaporation recovery device, comprising a waste gas treatment box (1) and a waste gas inlet pipe (3), characterized in that: The exhaust gas intake pipe (3) is inserted into the side wall of the exhaust gas treatment box (1), and a plurality of gas distribution pipes (4) are provided at the end of the exhaust gas intake pipe (3). A plurality of air holes are opened on the gas distribution pipe (4), and a one-way exhaust valve (5) is fixed in the air hole to facilitate the discharge of sulfur-containing exhaust gas. A filter (2) is provided below the exhaust gas intake pipe (3) and is fixed to the inner wall of the exhaust gas treatment box (1). The top and bottom of the exhaust gas treatment box (1) are respectively provided with a box top cover (6) and an evaporation box (15). A filter is vertically inserted on the box top cover (6) to collect the treated exhaust gas in the exhaust gas treatment box (1). An exhaust pipe (7) for exhausting flue gas, a flue gas treatment mechanism is provided in the exhaust pipe (7), a first inclined plate (13) is provided in an inclined manner in the exhaust gas treatment box (1), a second inclined plate (14) for blocking the exhaust gas treatment box (1) and the evaporation box (15) is provided above the evaporation box (15), a material pushing and liquid seepage mechanism is provided below the first inclined plate (13), the exhaust gas treatment box (1) and the evaporation box (15) are connected via a detachable and replaceable connecting hose (20), and a water vapor evaporation mechanism is provided in the evaporation box (15).

2. The device for evaporating and recovering flue gas desulfurization wastewater from a coal-fired power plant according to claim 1, characterized in that: The flue gas treatment mechanism comprises: A plurality of water storage tanks (9), wherein the plurality of water storage tanks (9) are linearly arranged and fixed to the exhaust pipe (7), and a water spray head (10) in communication with the water storage tanks (9) is provided at the bottom of the water storage tanks (9); The condensation water tank (8) is arranged in a circular shape and is fixed to the outer wall of the exhaust pipe (7). The condensation water tank (8) is connected to the water storage tank (9).

3. The device for evaporating and recovering flue gas desulfurization wastewater from a coal-fired power plant according to claim 1, characterized in that: The first inclined plate (13) and the second inclined plate (14) are not parallel to each other.

4. The device for evaporating and recovering flue gas desulfurization wastewater from a coal-fired power plant according to claim 1, characterized in that: The material pushing and liquid seepage mechanism comprises: An electric hydraulic cylinder (16), the electric hydraulic cylinder (16) being fixed to the inner wall of the exhaust gas treatment box (1), and a first push rod (21) being fixed to the output end of the electric hydraulic cylinder (16); A slide rail (22), wherein the slide rail (22) is fixed to the end of the first push rod (21), and a slider (23) is vertically slidable in the slide rail (22); A push plate (25) is fixed with a second push rod (24) on one side of the push plate (25) facing the electric hydraulic cylinder (16), and the second push rod (24) slides vertically on the slide rail (22) through a slider (23). A plurality of linearly arranged water seepage holes (26) are provided at the bottom of the push plate (25).

5. The device for evaporating and recovering flue gas desulfurization wastewater from a coal-fired power plant according to claim 4, characterized in that: A reaction zone is located on the second inclined plate (14) and on the side of the pusher plate (25) opposite to the electric hydraulic cylinder (16), and calcium carbonate for reacting with sulfide is laid in the reaction zone.

6. The device for evaporating and recovering flue gas desulfurization wastewater from a coal-fired power plant according to claim 1, characterized in that: The water vapor evaporation mechanism comprises: A plurality of electric heating wires (17), wherein the plurality of electric heating wires (17) are linearly arranged on the inner wall of the evaporation box (15) and are not connected to the bottom of the evaporation box (15); A discharge pipe (18), the discharge pipe (18) is inserted into the bottom of the evaporation box (15), and a valve (19) for controlling the outflow of liquid is provided on the outer wall of the evaporation box (15); A communicating air pipe (11) is provided on the side wall of the discharge pipe (18) with a steam outlet (12); one end of the communicating air pipe (11) is connected to the evaporation box (15) through the steam outlet (12); and the other end of the communicating air pipe (11) is connected to the flue gas treatment mechanism.

7. The device for evaporating and recovering flue gas desulfurization wastewater from a coal-fired power plant according to claim 1, characterized in that: The communicating hose (20) is filled with filter cotton for filtering wastewater residue.

Images