Flue gas purification system for garbage treatment

Abstract

The utility model discloses a flue gas purification system for garbage disposal, which comprises an incinerator, a heat exchanger, a desulfurization tower, a denitration tower, a drying box, an activated carbon adsorption box and a controller, the incinerator is communicated with the heat exchanger through a smoke discharge pipe, and the heat exchanger is communicated with the desulfurization tower through a gas outlet pipe; the heat exchanger is further communicated with a heat storage box through a heat recovery pipe, wherein the heat storage box is used for collecting and utilizing waste heat generated after heat exchange. According to the utility model, the heat exchanger communicated with the incinerator is arranged to recover waste heat in discharged high-temperature flue gas and send the waste heat into the heat storage box to be stored, so that the stored heat can be reasonably distributed and utilized, and meanwhile, the desulfurization tower, the denitration tower and other reactors are used for reaction; the flue gas treatment device effectively removes sulfides and nitrogen oxides in flue gas, further treats the reacted flue gas through the drying box and the activated carbon adsorption box, removes organic matters and trace heavy metals in the flue gas, and ensures that the treated flue gas can reach qualified emission standards.

Description

Technical Field

[0001] The utility model relates to the technical field of garbage processing equipment, in particular to a flue gas purification system for garbage processing. Background Art

[0002] As an effective way to dispose of waste, waste incineration is increasingly widely used. However, the dusty flue gas generated during waste incineration is highly polluting to the environment, so it is necessary to effectively treat the flue gas generated after incineration before discharging it.

[0003] Chinese patent 2023220846173 discloses a distributed waste treatment flue gas purification device, including a denitration reactor and a washing tower connected to each other, wherein a quenching nozzle, an ozone nozzle and a denitration nozzle are arranged in the denitration reactor; the washing tower is divided into a deacidification zone, a dust removal zone and a defogging zone from bottom to top; wherein the deacidification zone is provided with an alkali solution nozzle, the dust removal zone is provided with a dust removal module, and the defogging zone is provided with a ridge type defogger; the dust removal module includes a washing liquid nozzle, a venturi tube and a liquid collection tray. The utility model has a simple overall structure, and can continuously integrate denitration, desulfurization, dechlorination and dust removal for the flue gas of a small distributed waste treatment device, solving the problems of complexity, high operating cost and high energy consumption of a small distributed waste treatment device. However, since the flue gas directly enters the washing tower and is sprayed and cooled by quenching water, the waste heat of the high-temperature flue gas just discharged cannot be collected and utilized, and denitration, desulfurization and dechlorination are all carried out by spraying liquid, and the liquid after spraying is directly mixed in one body, which is not convenient for secondary utilization. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a flue gas purification system for garbage treatment, which can recycle the residual heat of high-temperature flue gas after garbage incineration.

[0005] In order to solve the above technical problems, the technical solutions adopted by the present utility model are as follows.

[0006] A flue gas purification system for garbage disposal comprises an incinerator, a heat exchanger, a desulfurization tower, a denitrification tower, a drying box, an activated carbon adsorption box and a controller. The incinerator is connected to the heat exchanger through a smoke exhaust pipe, and the heat exchanger is connected to the desulfurization tower through an exhaust pipe; the desulfurization tower and the denitrification tower, the denitrification tower and the drying box, and the drying box and the activated carbon adsorption box are connected through connecting pipes respectively; the heat exchanger is also connected to a heat storage box for collecting and utilizing the waste heat after the heat exchange through a heat recovery pipe.

[0007] In the above-mentioned flue gas purification system for garbage disposal, a temperature sensor is arranged on the air outlet pipe close to the air outlet of the heat exchanger, and the output end of the temperature sensor is connected to the input end of the controller.

[0008] In the above-mentioned flue gas purification system for garbage disposal, a three-way valve is installed on the outlet pipe, and the controlled end of the three-way valve is connected to the output end of the controller; one end of the three-way valve is connected to the outlet of the heat exchanger, the other end is connected to the inlet of the desulfurization tower, and the third port is connected to the exhaust pipe through the return pipe.

[0009] In the above-mentioned flue gas purification system for garbage disposal, regulating valves are respectively installed at the air inlet of the exhaust pipe and on the exhaust pipe below the return pipe, and the controlled end of the regulating valve is connected to the output end of the controller.

[0010] In the above-mentioned flue gas purification system for garbage disposal, a pressure sensor for detecting pipeline pressure is also installed on the exhaust pipe, and the output end of the pressure sensor is connected to the input end of the controller.

[0011] In the above-mentioned flue gas purification system for garbage disposal, spiral spray pipes are respectively installed in the desulfurization tower and the denitrification tower. The spray pipe in the desulfurization tower is connected to the first liquid inlet pipe on one side, and the spray pipe in the denitrification tower is connected to the second liquid inlet pipe on one side; the bottoms of the desulfurization tower and the denitrification tower are respectively provided with drain pipes for discharging the reaction liquid after the reaction so as to recover and process it for further reaction.

[0012] In the above-mentioned flue gas purification system for garbage disposal, concentration sensors for detecting the concentration of the post-reaction solution are respectively arranged inside the desulfurization tower and the denitrification tower, and the output end of the concentration sensor is connected to the input end of the controller.

[0013] Due to the adoption of the above technical scheme, the technical progress achieved by the present invention is as follows.

[0014] The utility model provides a flue gas purification system for garbage disposal, which recovers the waste heat in the discharged high-temperature flue gas by arranging a heat exchanger connected with the incinerator and sends it into a heat storage box for storage, so as to reasonably distribute and utilize the stored heat, and at the same time, reacts through reactors such as a desulfurization tower and a denitrification tower to effectively remove sulfides and nitrogen oxides in the flue gas, and further treats the flue gas after the reaction through a drying box and an activated carbon adsorption box to remove organic matter and trace heavy metals in the flue gas, thereby ensuring that the flue gas can meet qualified emission standards after treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the specific structure of the utility model;

[0016] Figure 2 It is a schematic diagram of the specific structure of the spray pipe of the utility model.

[0017] Among them: 1. Incinerator, 2. Smoke exhaust pipe, 3. Heat exchanger, 4. Exhaust pipe, 5. Three-way valve, 6. Desulfurization tower, 7. First liquid inlet pipe, 8. Denitrification tower, 9. Second liquid inlet pipe, 10. Connecting pipeline, 11. Drying box, 12. Activated carbon adsorption box, 13. Heat recovery pipe, 14. Heat storage box, 15. Pressure sensor, 16. Control valve, 17. Temperature sensor, 18. Drain pipe, 19. Spray pipe. DETAILED DESCRIPTION

[0018] The present invention will be further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0019] A flue gas purification system for garbage disposal, such as Figure 1 to Figure 2 As shown, it includes an incinerator 1, a heat exchanger 3, a desulfurization tower 6, a denitrification tower 8, a drying box 11, an activated carbon adsorption box 12, and a controller. The incinerator 1 is connected to the heat exchanger 3 through a smoke exhaust pipe 2, the heat exchanger 3 is connected to the desulfurization tower 6 through an exhaust pipe 4, and the desulfurization tower 6 and the denitrification tower 8, the denitrification tower 8 and the drying box 11, and the drying box 11 and the activated carbon adsorption box 12 are connected through connecting pipes 10 respectively.

[0020] The heat exchanger 3 is also connected to the heat storage tank 14 through the heat recovery pipe 13, so that the residual heat after the heat exchange can be collected and utilized, and the energy can be distributed reasonably.

[0021] A three-way valve 5 is installed on the air outlet pipe 4, and a controlled end of the three-way valve 5 is connected to an output end of the controller.

[0022] One end of the three-way valve 5 is connected to the air outlet of the heat exchanger 3, the other end is connected to the air inlet of the desulfurization tower 6, and the third port is connected to the exhaust pipe 2 through the return pipe.

[0023] A temperature sensor 17 is provided on the air outlet pipe 4 near the air outlet of the heat exchanger 3 , and the output end of the temperature sensor 17 is connected to the input end of the controller.

[0024] When the temperature sensor 17 detects that the temperature of the gas inside the outlet pipe 4 is higher than a certain value, it transmits a signal to the controller, and controls the three-way valve 5 to open the valve on one side connected to the return pipe through the controller, so that the exhaust gas re-enters the heat exchanger 3 for cooling and heat exchange. If the temperature is appropriate, it directly enters the desulfurization tower 6 for desulfurization treatment.

[0025] Regulating valves 16 are installed at the air inlet of the smoke exhaust pipe 2 and on the smoke exhaust pipe 2 below the return pipe, respectively, which can regulate and control the flow of smoke. The controlled end of the regulating valve 16 is connected to the output end of the controller.

[0026] A pressure sensor 15 for detecting the pipeline pressure is also installed on the smoke exhaust pipe 2, and the output end of the pressure sensor 15 is connected to the input end of the controller.

[0027] The desulfurization tower 6 is provided with a spiral spray pipe 19. Figure 2 As shown, the spray pipe 19 is connected to the first liquid inlet pipe 7 on one side, and can continuously spray the desulfurization reaction liquid into the desulfurization tower 6 to react with the flue gas. The spray pipe 19 is spirally arranged to increase the contact area between the spray liquid and the flue gas, thereby accelerating the reaction speed.

[0028] The denitrification tower 8 is also provided with a spiral spray pipe 19 , which is connected to the second liquid inlet pipe 9 on one side, and can continuously spray the denitrification reaction liquid for reacting with the flue gas into the denitrification tower 8 .

[0029] The bottoms of the desulfurization tower 6 and the denitration tower 8 are respectively provided with drainage pipes 18, which can discharge the reaction liquid in time so as to be recycled and processed for further reaction.

[0030] Concentration sensors for detecting the concentration of the post-reaction solution are also provided inside the desulfurization tower 6 and the denitrification tower 8. The output end of the concentration sensor is connected to the input end of the controller. The concentration of the post-reaction solution is used to determine whether it needs to be reused. If not, it can be directly discharged.

[0031] The flue gas after desulfurization and denitrification enters the drying box 11 and is dried by the internal desiccant, and then enters the activated carbon adsorption box 12 where the activated carbon adsorbs toxic substances in the flue gas to ensure that the treated flue gas meets the emission standards.

[0032] The utility model provides a flue gas purification system for garbage disposal, which recovers the waste heat in the discharged high-temperature flue gas by arranging a heat exchanger connected with the incinerator and sends it into a heat storage box for storage, so as to reasonably distribute and utilize the stored heat, and at the same time, reacts through reactors such as a desulfurization tower and a denitrification tower to effectively remove sulfides and nitrogen oxides in the flue gas, and further treats the flue gas after the reaction through a drying box and an activated carbon adsorption box to remove organic matter and trace heavy metals in the flue gas, thereby ensuring that the flue gas can meet qualified emission standards after treatment.

Claims

1. A flue gas purification system for garbage disposal, characterized in that: The invention comprises an incinerator (1), a heat exchanger (3), a desulfurization tower (6), a denitration tower (8), a drying box (11), an activated carbon adsorption box (12), and a controller. The incinerator (1) is connected to the heat exchanger (3) via a smoke exhaust pipe (2), and the heat exchanger (3) is connected to the desulfurization tower (6) via an exhaust pipe (4); the desulfurization tower (6) and the denitration tower (8), the denitration tower (8) and the drying box (11), and the drying box (11) and the activated carbon adsorption box (12) are connected via connecting pipes (10) respectively; the heat exchanger (3) is also connected to a heat storage box (14) for collecting and utilizing waste heat after heat exchange via a heat recovery pipe (13).

2. A flue gas purification system for garbage disposal according to claim 1, characterized in that: A temperature sensor (17) is provided on the air outlet pipe (4) close to the air outlet of the heat exchanger (3), and the output end of the temperature sensor (17) is connected to the input end of the controller.

3. A flue gas purification system for garbage disposal according to claim 1, characterized in that: A three-way valve (5) is installed on the outlet pipe (4), and the controlled end of the three-way valve (5) is connected to the output end of the controller; one end of the three-way valve (5) is connected to the outlet of the heat exchanger (3), the other end is connected to the inlet of the desulfurization tower (6), and the third end is connected to the smoke exhaust pipe (2) through a return pipe.

4. A flue gas purification system for garbage disposal according to claim 3, characterized in that: A regulating valve (16) is installed at the air inlet of the smoke exhaust pipe (2) and on the smoke exhaust pipe (2) below the return pipe, respectively, and a controlled end of the regulating valve (16) is connected to an output end of a controller.

5. A flue gas purification system for garbage disposal according to claim 1, characterized in that: The smoke exhaust pipe (2) is also equipped with a pressure sensor (15) for detecting the pipeline pressure, and the output end of the pressure sensor (15) is connected to the input end of the controller.

6. A flue gas purification system for garbage disposal according to claim 1, characterized in that: The desulfurization tower (6) and the denitration tower (8) are respectively provided with spiral spray pipes (19); the spray pipe (19) in the desulfurization tower (6) is connected to a first liquid inlet pipe (7) on one side, and the spray pipe (19) in the denitration tower (8) is connected to a second liquid inlet pipe (9) on one side; and the bottoms of the desulfurization tower (6) and the denitration tower (8) are respectively provided with drain pipes (18) for discharging the reaction liquid after the reaction so as to recover and process it for another reaction.

7. A flue gas purification system for garbage disposal according to claim 1, characterized in that: Concentration sensors for detecting the concentration of the post-reaction solution are also respectively arranged inside the desulfurization tower (6) and the denitration tower (8), and the output end of the concentration sensor is connected to the input end of the controller.

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