Treatment device for excess ammonia in tail gas of biogas generator

Abstract

The utility model discloses a device for treating excessive ammonia in tail gas of a biogas generator. A first-stage cooling device, a second-stage water absorption device and a third-stage acid absorption device are connected through pipelines; the circulating water heat dissipation device comprises a water heat dissipation storage tank, a water supply pipe and a water return pipe, the water supply pipe extends into the top end in the first-stage cooling device, and a water outlet pipe is connected with the bottom end of the first-stage cooling device; the circulating water absorption device comprises a water absorption storage tank, a water supply pipe and a water return pipe, the water supply pipe extends into the top end in the first-stage cooling device, and a water outlet pipe is connected with the bottom end of the second-stage water absorption device; the third-stage acid absorption device comprises an acid storage tank, an acid supply pipe and an acid return pipe, the acid supply pipe extends into the inner top end of the third-stage acid absorption device, and the acid return pipe is connected with the bottom end of the third-stage acid absorption device. According to the treatment device for excess ammonia in tail gas of the biogas generator, the excess ammonia can be almost thoroughly removed, and meanwhile secondary pollutants are not generated.

Description

Technical Field

[0001] The utility model relates to the technical field of tail gas treatment, in particular to a device for treating excess ammonia in tail gas of a biogas generator. Background Art

[0002] The unstable gas composition of biogas generators leads to unstable operation of the generators, resulting in great fluctuations in pollutants emitted from tail gas, especially serious excess of ammonia. The existing conventional tail gas ASC (deamination) technology mainly uses catalysts to oxidize ammonia into nitrogen oxides under high temperature conditions to achieve deamination. This technology can only be achieved when the generator is stable and the amount of ammonia is small. However, when there is an excess of ammonia, the nitrogen oxides formed by catalytic oxidation seriously exceed the standard and fail the environmental protection test. Therefore, the contradiction cannot achieve stable deamination of biogas generators and nitrogen compliance. Utility Model Content

[0003] In view of this, the utility model proposes a device for treating excess ammonia in tail gas of a biogas generator.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A device for treating excess ammonia in tail gas of a biogas generator, comprising a primary cooling device, a secondary water absorption device, a tertiary acid absorption device, a circulating water heat dissipation device, a circulating water absorption device and a neutralizing circulating acid absorption device; the primary cooling device, the secondary water absorption device and the tertiary acid absorption device are connected in sequence through pipelines, and the primary cooling device and the tertiary acid absorption device are respectively connected to a high-temperature tail gas supply pipe and a flue gas outlet pipe;

[0006] The circulating water heat dissipation device includes a water heat dissipation storage tank, a water supply pipe and a return pipe. The water supply pipe connected to the water heat dissipation storage tank extends into the top of the first-level cooling device, and the water outlet pipe is connected to the bottom of the first-level cooling device; the circulating water absorption device includes a water absorption storage tank, a water supply pipe and a return pipe. The water supply pipe connected to the water absorption storage tank extends into the top of the first-level cooling device, and the water outlet pipe is connected to the bottom of the second-level water absorption device; the tertiary acid absorption device includes an acid storage tank, an acid supply pipe and an acid return pipe. The acid supply pipe connected to the acid storage tank extends into the top of the first-level cooling device, and the acid return pipe is connected to the bottom of the tertiary acid absorption device.

[0007] Preferably, the high-temperature exhaust gas supply pipe is connected to the first flue gas bypass pipe and the second flue gas bypass pipe respectively; the first flue gas bypass pipe is connected to the lower inlet of the first-stage cooling device; the upper outlet of the first-stage cooling device is connected to the lower inlet of the second-stage water absorption device; the upper outlet of the second-stage water absorption device is connected to the lower inlet of the tertiary acid absorption device; the top outlet of the tertiary acid absorption device is connected to the second flue gas bypass pipe and the flue gas outlet pipe; the first flue gas bypass pipe is provided with a first bypass valve; the second flue gas bypass pipe is provided with a second bypass valve.

[0008] Preferably, the first-stage cooling device is filled with gas-steam fully mixed filler.

[0009] Preferably, the gas-steam fully mixed filler is corrugated stainless steel wires wound around each other.

[0010] Preferably, the secondary water absorption device is filled with gas vapor sufficient absorption filler.

[0011] Preferably, the gas vapor fully absorbing filler is a stainless steel multi-faceted hollow ball.

[0012] Preferably, the tertiary acid absorption device is filled with gas-vapor fully reactive fillers.

[0013] Preferably, the gas-steam fully reactive filler is a plastic multi-faceted hollow sphere.

[0014] Preferably, the inner top wall of the water heat dissipation storage tank is provided with a cooling fan; the inner top wall of the water absorption storage tank is provided with a cooling fan;

[0015] The water supply pipe connected to the circulating water heat dissipation device extends into the top of the first-stage cooling device at one end and is connected to an atomizing nozzle; the water supply pipe of the circulating water absorption device extends into the top of the second-stage water absorption device at one end and is connected to an atomizing nozzle; the acid supply pipe of the circulating acid absorption device extends into the top of the tertiary acid absorption device at one end and is connected to an atomizing nozzle.

[0016] Preferably, a driving pump is provided on the water supply pipe of the circulating water heat dissipation device, the water supply pipe of the circulating water absorption device, and the acid supply pipe of the circulating acid absorption device respectively;

[0017] The upper ends of the water heat dissipation storage tank, the water absorption storage tank and the acid storage tank are respectively provided with a water replenishment port, a water replenishment port and an acid replenishment port.

[0018] Compared with the existing technology, the beneficial effects of the utility model are:

[0019] (1) This device realizes a three-layer treatment system with different principles: primary cooling, secondary water absorption, and tertiary acid absorption, which completely absorbs ammonia in the generator exhaust gas to a state of basically zero;

[0020] (2) This device uses a combination of physical and chemical methods, does not produce new air pollutants, and thus will not cause excessive nitrogen in the tail gas;

[0021] (3) This device realizes the comprehensive collection and processing of waste pollutants, turning waste into treasure; ammonia and waste acid are neutralized to form ammonium sulfate solution, which has economic value as the main fertilizer raw material;

[0022] (4) The device can purify other trace harmful gases in the tail gas that are soluble in water, acid, or alkaline, thereby further purifying the tail gas. At the same time, the composition of the sprayed liquid can be changed according to demand to absorb other harmful gas components.

[0023] (5) The device is convenient for drainage, flushing, maintenance and replacement of parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0025] In the figure: 1. primary cooling device; 2. secondary water absorption device; 3. tertiary acid absorption device; 4. high-temperature exhaust gas supply pipe; 5. first flue gas bypass pipe; 6. second flue gas bypass pipe; 7. flue gas outlet pipe; 8. first bypass valve; 9. second bypass valve; 10. water heat dissipation storage tank; 11. water supply pipe; 12. return pipe; 13. atomizing nozzle; 14. driving pump; 15. water replenishment port; 16. cooling fan; 17. water absorption storage tank; 18. acid storage tank; 19. acid supply pipe; 20. acid return pipe; 21. acid replenishment port; 22. gas-vapor fully mixed filler; 23. gas-vapor fully absorbed filler; 24. gas-vapor fully reacted filler. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0027] In the description of the present invention, unless otherwise specified, "multiple" means two or more; the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third" and the like are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0028] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] Example:

[0030] like Figure 1 As shown, a device for treating excess ammonia in tail gas of a biogas generator comprises a primary cooling device 1, a secondary water absorption device 2, a tertiary acid absorption device 3, a circulating water heat dissipation device, a circulating water absorption device and a neutralizing circulating acid absorption device.

[0031] The high-temperature tail gas supply pipe 4 is connected to the first flue gas bypass pipe 5 and the second flue gas bypass pipe 6 respectively; the first flue gas bypass pipe 5 is connected to the lower inlet of the first-stage cooling device 1; the upper outlet of the first-stage cooling device 1 is connected to the lower inlet of the second-stage water absorption device 2; the upper outlet of the second-stage water absorption device 2 is connected to the lower inlet of the tertiary acid absorption device 3; the top outlet of the tertiary acid absorption device 3 is connected to the second flue gas bypass pipe 6 and the flue gas outlet pipe 7; the first flue gas bypass pipe 5 is provided with a first bypass valve 8; the second flue gas bypass pipe 6 is provided with a second bypass valve 9.

[0032] The circulating water heat dissipation device comprises a water heat dissipation storage tank 10, a water supply pipe 11 and a water return pipe 12. The water supply pipe 11 connected to the water heat dissipation storage tank 10 extends into the top of the first-stage cooling device 1, and one end of the water supply pipe 11 of the circulating water heat dissipation device extending into the top of the first-stage cooling device 1 is connected to an atomizing nozzle 13; the water outlet pipe connected to the water heat dissipation storage tank 10 is connected to the bottom of the first-stage cooling device 1. A driving pump 14 is respectively provided on the water supply pipe 11 of the circulating water heat dissipation device. A water replenishment port 15 is provided at the upper end of the water heat dissipation storage tank 10. A cooling fan 16 is provided on the inner top wall of the water heat dissipation storage tank 10.

[0033] The first-stage cooling device 1 is filled with a gas-steam fully mixed filler 22. The gas-steam fully mixed filler 22 is a corrugated wire type intertwined with each other, there are gaps between the corrugated wire types intertwined with each other, and it is relatively loose, and the corrugated steel type is made of 304 stainless steel.

[0034] The circulating water absorption device includes a water absorption tank 17, a water supply pipe 11 and a water return pipe 12. The water supply pipe 11 connected to the water absorption tank 17 extends into the top of the primary cooling device 1, and one end of the water supply pipe 11 of the circulating water absorption device extends into the top of the secondary water absorption device 2 and is connected to an atomizing nozzle 13; the water outlet pipe connected to the water absorption tank 17 is connected to the bottom of the secondary water absorption device 2. A driving pump 14 is provided on the water supply pipe 11 of the circulating water absorption device. A water replenishment port 15 is provided at the upper end of the water absorption tank 17. A cooling fan 16 is provided on the inner top wall of the water storage tank of the water absorption tank 17.

[0035] The secondary water absorption device 2 is filled with a gas vapor fully absorbing filler 23. The gas vapor fully absorbing filler 23 is a multi-faceted hollow ball, and the multi-faceted hollow ball is made of 304 stainless steel.

[0036] The tertiary acid absorption device 3 includes an acid storage tank 18, an acid supply pipe 19 and an acid return pipe 20. The acid supply pipe 19 connected to the acid storage tank 18 extends into the top of the tertiary acid absorption device 3, and one end of the acid supply pipe 19 of the circulating acid absorption device extending into the top of the tertiary acid absorption device 3 is connected to an atomizing nozzle 13; the acid return pipe 20 connected to the acid storage tank 18 is connected to the bottom end of the tertiary acid absorption device 3. A driving pump 14 is provided on the acid supply pipe 19 of the circulating acid absorption device. An acid replenishment port 21 is provided at the upper end of the acid storage tank 18.

[0037] The tertiary acid absorption device 3 is filled with gas-vapor fully reactive filler 24. The gas-vapor fully reactive filler 24 is a plastic multi-faceted hollow ball, which is made of plastic. The inner and outer walls of the acid storage tank 18 are made of PPH high-temperature resistant plastic material.

[0038] The working principle of the utility model is:

[0039] The flue gas is introduced into the primary cooling device 1 through the high-temperature tail gas supply pipe 4; the water heat dissipation storage tank 10 is filled with water, and the pump 14 is driven to work. The water is introduced into the top of the water heat dissipation storage tank 10 through the water supply pipe 11, and is sprayed out by the atomizing nozzle 13 to cool the high-temperature flue gas with water mist. The water after heat exchange flows back to the water heat dissipation storage tank 10 through the return pipe 12. The cooling fan 16 at the top of the water heat dissipation storage tank 10 cools the reflux water, so that the cooled water can be circulated and transmitted to the primary cooling device 1 next time to cool the flue gas;

[0040] The gas and steam inside the first-stage cooling device 1 are fully mixed with the filler 22, which can conduct heat and also play a role in transferring the flue gas temperature to the gas and steam fully mixed filler 22, thereby cooling the flue gas; the first-stage cooling device 1 can cool the flue gas to below 100°C, and cooling the flue gas to below 100°C is a prerequisite for subsequent treatment;

[0041] The cooled flue gas is transmitted from the primary cooling device 1 to the secondary water absorption device 2 through a pipeline. The water absorption tank 17 is filled with water, and the pump 14 is driven to work. The water is passed through the water supply pipe 11 to the top of the water absorption tank 17, and is sprayed out by the atomizing nozzle 13. While cooling the flue gas with water mist, the ammonia in the flue gas is also absorbed. The water after heat exchange flows back to the water absorption tank 17 through the return pipe 12. The cooling fan 16 at the top of the water absorption tank 17 cools the return water, so that the cooled water can be circulated and transmitted to the secondary water absorption device 2 next time to cool the flue gas.

[0042] The gas vapor inside the first-stage cooling device 1 fully absorbs the filler 23, which can conduct heat and transfer the flue gas temperature to the gas vapor fully mixed filler 22, thereby cooling the flue gas. At the same time, the temperature at the boundary of the metal wire is lower and can absorb ammonia to a greater extent; the second-stage cooling device can absorb 80-100% of ammonia and also reduce the exhaust gas temperature to below 50°C;

[0043] The flue gas after ammonia absorption and cooling is transmitted from the secondary water absorption device 2 to the tertiary acid absorption device 3 through a pipeline. The acid storage tank 18 contains dilute sulfuric acid, and the pump 14 is driven to work. The dilute sulfuric acid is passed into the top of the acid storage tank 18 through the acid supply pipe 19 and sprayed out by the atomizing nozzle 13. The residual ammonia and the dilute sulfuric acid are neutralized to form ammonium sulfate; the ammonium sulfate solution flows back to the acid storage tank 18 through the acid return pipe 20;

[0044] The gas inside the tertiary acid absorption device 3 fully reacts with the filler 24, which helps the ammonia and dilute sulfuric acid to undergo a more complete neutralization reaction; the secondary cooling device can almost completely absorb the ammonia, and ultimately achieve almost zero pollutants.

[0045] The above are only preferred specific implementation methods of the utility model, but the protection scope of the utility model is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the utility model, who makes equivalent replacements or changes based on the technical scheme and utility model concept of the utility model, should be covered by the protection scope of the utility model.

Claims

1. A device for treating excess ammonia in tail gas from a biogas generator, characterized in that: It comprises a primary cooling device (1), a secondary water absorption device (2), a tertiary acid absorption device (3), a circulating water heat dissipation device, a circulating water absorption device and a neutralizing circulating acid absorption device; the primary cooling device (1), the secondary water absorption device (2) and the tertiary acid absorption device (3) are connected in sequence through pipelines, and the primary cooling device (1) and the tertiary acid absorption device (3) are respectively connected to a high-temperature exhaust gas supply pipe (4) and a flue gas outlet pipe (7); The circulating water heat dissipation device comprises a water heat dissipation storage tank (10), a water supply pipe (11) and a water return pipe (12); the water supply pipe (11) connected to the water heat dissipation storage tank (10) extends into the top end of the first-stage cooling device (1), and the water outlet pipe is connected to the bottom end of the first-stage cooling device (1); the circulating water absorption device comprises a water absorption storage tank (17), a water supply pipe (11) and a water return pipe (12); the water supply pipe (11) connected to the water absorption storage tank (17) extends into the top end of the first-stage cooling device (1), and the water outlet pipe is connected to the bottom end of the second-stage water absorption device (2); the tertiary acid absorption device (3) comprises an acid storage tank (18), an acid supply pipe (19) and an acid return pipe (20); the acid supply pipe (19) connected to the acid storage tank (18) extends into the top end of the tertiary acid absorption device (3), and the acid return pipe (20) is connected to the bottom end of the tertiary acid absorption device (3).

2. The device for treating excess ammonia in tail gas of a biogas generator according to claim 1, characterized in that: The high-temperature exhaust gas supply pipe (4) is connected to the first flue gas bypass pipe (5) and the second flue gas bypass pipe (6) respectively; the first flue gas bypass pipe (5) is connected to the lower inlet of the first cooling device (1); the upper outlet of the first cooling device (1) is connected to the lower inlet of the second water absorption device (2); the upper outlet of the second water absorption device (2) is connected to the lower inlet of the tertiary acid absorption device (3); the top outlet of the tertiary acid absorption device (3) is connected to the second flue gas bypass pipe (6) and the flue gas outlet pipe (7); the first flue gas bypass pipe (5) is provided with a first bypass valve (8); the second flue gas bypass pipe (6) is provided with a second bypass valve (9).

3. The device for treating excess ammonia in tail gas of a biogas generator according to claim 1, characterized in that: The first-stage cooling device (1) is filled with a gas-steam fully mixed filler (22).

4. The device for treating excess ammonia in tail gas of a biogas generator according to claim 3, characterized in that: The gas-steam fully mixed filler (22) is corrugated stainless steel wires that are intertwined.

5. The device for treating excess ammonia in tail gas of a biogas generator according to claim 1, characterized in that: The secondary water absorption device (2) is filled with gas vapor sufficient absorption filler (23).

6. The device for treating excess ammonia in tail gas of a biogas generator according to claim 5, characterized in that: The gas vapor fully absorbing filler (23) is a stainless steel multi-faceted hollow ball.

7. The device for treating excess ammonia in tail gas of a biogas generator according to claim 1, characterized in that: The tertiary acid absorption device (3) is filled with gas-vapor fully reactive filler (24).

8. The device for treating excess ammonia in tail gas of a biogas generator according to claim 7, characterized in that: The gas-vapor fully reactive filler (24) is a plastic multi-faceted hollow sphere.

9. The device for treating excess ammonia in tail gas of a biogas generator according to claim 1, characterized in that: The inner top wall of the water heat dissipation storage tank (10) is provided with a heat dissipation fan (16); the inner top wall of the water absorption storage tank (17) is provided with a heat dissipation fan (16); The water supply pipe (11) connected to the circulating water heat dissipation device extends into the top of the first-stage cooling device (1) and is connected to an atomizing nozzle (13); the water supply pipe (11) of the circulating water absorption device extends into the top of the second-stage water absorption device (2) and is connected to an atomizing nozzle (13); the acid supply pipe (19) of the circulating acid absorption device extends into the top of the third-stage acid absorption device (3) and is connected to an atomizing nozzle (13).

10. The device for treating excess ammonia in tail gas of a biogas generator according to claim 1, characterized in that: A driving pump (14) is respectively provided on the water supply pipe (11) of the circulating water heat dissipation device, the water supply pipe (11) of the circulating water absorption device, and the acid supply pipe (19) of the circulating acid absorption device; The upper ends of the water heat dissipation storage tank (10), the water absorption storage tank (17), and the acid storage tank (18) are respectively provided with a water replenishment port (15), a water replenishment port (15), and an acid replenishment port (21).

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