A waste incineration power plant flue gas end ammonia escape control device

Abstract

The application discloses a kind of garbage incineration power plant flue gas end ammonia escape control equipment, including dispensing tank, storage tank and flue pipe, dispensing tank is provided with salt water pipeline and acid liquid pipeline, first parallel pump group is arranged between dispensing tank and storage tank, the inside of flue pipe is provided with atomizing spray gun, between the liquid outlet of storage tank and the liquid inlet of atomizing spray gun second parallel pump group is arranged.The application is connected with the salt water structure and the acid liquid structure of outside respectively by the salt water pipeline and the acid liquid pipeline on dispensing tank, and salt water and acid liquid are added to dispensing tank respectively, to prepare the acid liquid medicament of required target concentration, then the acid liquid medicament is transported to storage tank by first parallel pump group and is stored, then by the cooperation of second parallel pump group and atomizing spray gun, to atomize and spray the acid liquid medicament in storage tank to flue pipe, to reach the purpose of neutralizing ammonia-containing flue gas, to solve the problem that ammonia escape phenomenon occurs in denitration reaction process and causes environmental pollution.

Description

Technical Field

[0001] This application relates to the technical field of flue gas treatment in waste incineration power plants, and in particular to a device for controlling ammonia escape at the end of flue gas in waste incineration power plants. Background Technology

[0002] Currently, the conventional method for denitrification of flue gas produced by waste incineration power plants is to use the SNCR process. Ammonia water is injected into the furnace at a temperature of 850-1100℃, where the reducing agent rapidly decomposes into NH3, which then undergoes a selective oxidation-reduction reaction with NOx in the flue gas to generate harmless gases such as N2 and H2O.

[0003] During the denitrification process, the phenomenon of unreacted ammonia being released into the flue gas through the reactor is called ammonia slip. In recent years, with the improvement of social development and the enhancement of environmental awareness, ammonia slip has gradually been included as one of the control indicators for flue gas emissions from waste incineration power plants. Therefore, it is urgent to design and install ammonia slip control equipment at the end of the flue gas emission of waste incineration power plants to meet higher standards for flue gas pollutant emissions. Utility Model Content

[0004] The purpose of this application is to provide an ammonia escape control device at the end of the flue gas in a waste incineration power plant to solve the problem of environmental pollution caused by ammonia escape during the denitrification reaction process.

[0005] The technical solution for the end-of-pipe ammonia escape control device in a waste-to-energy plant flue gas provided in this application is as follows:

[0006] A waste-to-energy incineration plant flue gas end-of-pipe ammonia escape control device includes a dosing tank, a storage tank, and a flue pipe. The dosing tank is equipped with a demineralized water pipe and an acid pipe. The demineralized water pipe is connected to an external demineralized water structure, and the acid pipe is connected to an external acid structure. A first parallel pump set is provided between the dosing tank and the storage tank. An atomizing spray gun is provided inside the flue pipe. A second parallel pump set is provided between the liquid outlet of the storage tank and the liquid inlet of the atomizing spray gun.

[0007] Furthermore, the first parallel pump set includes a first output pipe connected at one end to the liquid outlet of the dispensing tank, a first input pipe connected at the liquid inlet of the storage tank, and first centrifugal pumps symmetrically arranged between the dispensing tank and the storage tank. The liquid inlet of both first centrifugal pumps is connected to one end of the first output pipe through a first inlet pipe, and the liquid outlet of both first centrifugal pumps is connected to one end of the first input pipe through a first outlet pipe.

[0008] Furthermore, valves are provided on the first output pipe, the first input pipe, the first liquid inlet pipe, and the first liquid outlet pipe.

[0009] Furthermore, the second parallel pump set includes a second output pipe with one end connected to the liquid outlet of the medicine storage tank, a second input pipe connected to the liquid inlet of the atomizing spray gun, and a second centrifugal pump symmetrically arranged between the medicine storage tank and the atomizing spray gun. The liquid inlet of both second centrifugal pumps is connected to one end of the second output pipe through a second inlet pipe, and the liquid outlet of both second centrifugal pumps is connected to one end of the second input pipe through a second outlet pipe.

[0010] Furthermore, valves are provided on the second output pipe, the second input pipe, the second liquid inlet pipe, and the second liquid outlet pipe.

[0011] Furthermore, a circulation branch pipe is connected between the medicine storage tank and the second input pipe, and a valve is installed on the circulation branch pipe.

[0012] Furthermore, a pressure gauge and a flow meter are also installed on the second input pipe.

[0013] Furthermore, the exhaust end of the flue is connected to an induced draft fan, the inlet end of the flue is connected to a bag filter, and the inlet end of the bag filter is connected to an external ammonia-containing flue gas emission structure.

[0014] Compared with the prior art, the beneficial effects of this application are as follows: by setting up a demineralized water pipe and an acid pipe on the dosing tank to be interconnected with the external demineralized water structure and acid structure respectively, and then adding the demineralized water and acid to the dosing tank to prepare the acid agent of the required target concentration, the acid agent is then transported to the storage tank for storage by the first parallel pump group, and then the acid agent in the storage tank is atomized and sprayed into the flue pipe by the cooperation of the second parallel pump group and the atomizing spray gun to achieve the purpose of neutralizing the ammonia-containing flue gas, thereby solving the problem of ammonia escape and environmental pollution caused by the denitrification reaction process. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the ammonia escape control device at the end of the flue gas in a waste incineration power plant, according to an embodiment of this application.

[0016] Explanation of reference numerals in the attached figures:

[0017] 1. Dosing tank; 11. Demineralized water pipeline; 12. Acid pipeline; 2. Storage tank; 3. Flue; 31. Exhaust fan; 32. Bag filter; 33. Ammonia-containing flue gas emission structure; 4. Demineralized water structure; 5. Acid structure; 6. Atomizing spray gun; 7. First output pipe; 71. First input pipe; 72. First centrifugal pump; 73. First inlet pipe; 74. First outlet pipe; 8. Second output pipe; 81. Second input pipe; 82. Second centrifugal pump; 83. Second inlet pipe; 84. Second outlet pipe; 85. Pressure gauge; 86. Flow meter; 9. Circulation branch pipe. Detailed Implementation

[0018] The following is in conjunction with the appendix Figure 1 This application will be described in further detail.

[0019] This application discloses an end-of-pipe ammonia escape control device for waste incineration power plants, referring to... Figure 1 In this embodiment, the ammonia escape control equipment at the end of the flue gas in the waste incineration power plant includes a dosing tank 1, a storage tank 2, a first parallel pump group, a flue pipe 3, an atomizing spray gun 6, and a second parallel pump group. Specifically, a demineralized water pipe 11 and an acid pipe 12 are installed on the top of the dosing tank 1. The demineralized water pipe 11 is connected to an external demineralized water structure 4, which stores demineralized water. The acid pipe 12 is connected to an external acid structure 5, which stores acid.

[0020] Therefore, by setting up demineralized water pipe 11 and acid pipe 12, demineralized water and acid can be added to the preparation tank 1 respectively to prepare the acid reagent of the required target concentration; and valves are installed on both demineralized water pipe 11 and acid pipe 12, which facilitate the opening and closing of demineralized water pipe 11 and acid pipe 12 respectively. In addition, the use of demineralized water can also protect the equipment in the circuit.

[0021] Meanwhile, the storage tank 2 is placed on one side of the preparation tank 1; the first parallel pump set is set between the preparation tank 1 and the storage tank 2 to draw the acid solution prepared in the preparation tank 1 into the storage tank 2, so as to facilitate the storage of the acid solution in the storage tank 2 for subsequent extraction and use.

[0022] Specifically, refer to Figure 1 In this embodiment, the first parallel pump group includes a first output pipe 7, a first input pipe 71, a first centrifugal pump 72, a first inlet pipe 73, and a first outlet pipe 74. One end of the first output pipe 7 is connected to the outlet end of the preparation tank 1; one end of the first input pipe 71 is connected to the inlet end of the storage tank 2; two first centrifugal pumps 72 are provided, symmetrically installed between the preparation tank 1 and the storage tank 2, serving as the power source for extracting the acid solution.

[0023] Two first inlet pipes 73 are provided. One end of each first inlet pipe 73 is simultaneously connected to the end of the first output pipe 7 away from the medicine tank 1, and the other end of each first inlet pipe 73 is respectively connected to the inlet end of each first centrifugal pump 72. Two first outlet pipes 74 are provided. One end of each first outlet pipe 74 is simultaneously connected to the end of the first input pipe 71 away from the medicine storage tank 2, and the other end of each first outlet pipe 74 is respectively connected to the outlet end of each first centrifugal pump 72.

[0024] Preferably, valves are installed on the first output pipe 7, the first input pipe 71, the first liquid inlet pipe 73, and the first liquid outlet pipe 74; the connection status of the first output pipe 7, the first input pipe 71, the first liquid inlet pipe 73, and the first liquid outlet pipe 74 is controlled by opening and closing the valves.

[0025] Specifically, a first centrifugal pump 72, a first inlet pipe 73, and a first outlet pipe 74 form one extraction route. Therefore, in this embodiment, there are two extraction routes between the preparation tank 1 and the storage tank 2. These two extraction routes are connected in parallel between the first output pipe 7 and the first input pipe 71. When extracting the acid solution from the preparation tank 1 into the storage tank 2, only one extraction route is used, and the other extraction route is used as a backup route. When one extraction route is damaged and stops, the backup extraction route is used again by adjusting the corresponding valve on the pipeline. This operation method will not affect the extraction process of the acid solution and can also improve the work efficiency.

[0026] When using one of the extraction routes, the first centrifugal pump 72 in the route is started, so that the first output pipe 7 draws the acid solution in the preparation tank 1 into the first inlet pipe 73 and the first outlet pipe 74, and then draws it into the first input pipe 71. Finally, the acid solution is drawn into the storage tank 2 for storage, to be used later.

[0027] In addition, the flue pipe 3 is located on one side of the medicine mixing tank 1 and the medicine storage tank 2, and an induced draft fan 31 is connected to the exhaust end of the flue pipe 3. A bag filter 32 is connected to the inlet end of the flue pipe 3, and the inlet end of the bag filter 32 is connected to the external ammonia-containing flue gas emission structure 33.

[0028] When the induced draft fan 31 is started, the ammonia-containing flue gas in the ammonia-containing flue gas emission structure 33 is drawn into the bag filter 32. The bag filter 32 filters the impurity particles in the ammonia-containing flue gas, and then the filtered ammonia-containing flue gas is drawn into the flue pipe 3, so that the ammonia-containing flue gas flows in the flue pipe 3 along the direction of the induced draft fan 31.

[0029] Meanwhile, the atomizing spray gun 6 is installed inside the flue pipe 3 between the end of the bag filter 32 and the induced draft fan 31, and the second parallel pump group is set between the liquid inlet of the atomizing spray gun 6 and the liquid outlet of the storage tank 2, so as to draw the acid agent stored in the storage tank 2 into the atomizing spray gun 6. Finally, the acid agent is atomized and sprayed into the flue pipe 3 by the atomizing spray gun 6, thereby achieving the purpose of neutralizing the ammonia-containing flue gas, and thus solving the problem of ammonia escape during the denitrification reaction process, which leads to environmental pollution.

[0030] Specifically, refer to Figure 1 In this embodiment, the second parallel pump group includes a second output pipe 8, a second input pipe 81, a second centrifugal pump 82, a second inlet pipe 83, and a second outlet pipe 84. One end of the second output pipe 8 is connected to the outlet end of the storage tank 2; one end of the second input pipe 81 is connected to the inlet end of the atomizing spray gun 6; two second centrifugal pumps 82 are provided, symmetrically installed between the storage tank 2 and the atomizing spray gun 6, serving as the power device for extracting the acid solution.

[0031] There are two second inlet pipes 83. One end of each second inlet pipe 83 is connected to the end of the second outlet pipe 8 away from the medicine storage tank 2. The other ends of the two second inlet pipes 83 are respectively connected to the inlet ends of the two second centrifugal pumps 82. There are two second outlet pipes 84. One end of each second outlet pipe 84 is connected to the end of the second input pipe 81 away from the atomizing spray gun 6. The other ends of the two second outlet pipes 84 are respectively connected to the outlet ends of the two second centrifugal pumps 82.

[0032] Preferably, valves are installed on the second output pipe 8, the second input pipe 81, the second inlet pipe 83, and the second outlet pipe 84; the connection status of the second output pipe 8, the second input pipe 81, the second inlet pipe 83, and the second outlet pipe 84 is controlled by opening and closing the valves.

[0033] Specifically, a second centrifugal pump 82, a second inlet pipe 83, and a second outlet pipe 84 form one extraction route. Therefore, in this embodiment, there are two extraction routes between the storage tank 2 and the atomizing spray gun 6. These two extraction routes are connected in parallel between the second output pipe 8 and the second input pipe 81. When extracting the acid from the storage tank 2 into the atomizing spray gun 6, only one extraction route is used, while the other extraction route serves as a backup. When one extraction route fails and stops, the backup extraction route is used by adjusting the corresponding valves on the pipeline. This operation method does not affect the extraction process of the acid and can also improve the work efficiency.

[0034] When using one of the extraction routes, the second centrifugal pump 82 in the route is started, so that the second output pipe 8 draws the acid agent in the storage tank 2 into the second inlet pipe 83 and the second outlet pipe 84, and then draws it into the second input pipe 81. Finally, the acid agent is drawn into the atomizing spray gun 6, and then the atomizing spray gun 6 is used to spray the acid agent into the flue pipe 3, thereby achieving the purpose of neutralizing the ammonia-containing flue gas.

[0035] Preferably, in this embodiment, a pressure gauge 85 and a flow meter 86 are also installed on the second input pipe 81. By setting the pressure gauge 85, the pressure of the acid liquid in the second input pipe 81 can be measured; by setting the flow meter 86, the instantaneous flow rate and cumulative volume of the acid liquid in the second input pipe 81 can be measured, and the acid liquid can also be quantitatively controlled.

[0036] In addition, refer to Figure 1 In this embodiment, a circulation branch pipe 9 is also connected between the medicine storage tank 2 and the second input pipe 81. A valve is installed on the circulation branch pipe 9. By opening the valve, the circulation branch pipe 9 is connected, which can maintain the pressure of the second input pipe 81 and prevent the second centrifugal pump 82 from being damaged due to pressure buildup.

[0037] The implementation principle of the ammonia escape control device at the end of flue gas in a waste incineration power plant according to an embodiment of this application is as follows: When it is necessary to neutralize the ammonia-containing flue gas in the flue pipe 3, the demineralized water and acid are first added to the dosing tank 1 through the demineralized water pipe 11 and the acid pipe 12 respectively to prepare the acid agent of the required target concentration; then the first centrifugal pump 72 on one of the extraction lines is started, so that the first output pipe 7 draws the acid agent in the dosing tank 1 into the first inlet pipe 73 and the first outlet pipe 74, and then draws it into the first input pipe 71, and finally draws the acid agent into the storage tank 2 for storage.

[0038] Then, the second centrifugal pump 82 is started, so that the second output pipe 8 draws the acid agent in the storage tank 2 into the second inlet pipe 83 and the second outlet pipe 84, and then into the second input pipe 81. Finally, the acid agent is drawn into the atomizing spray gun 6, and then the atomizing spray gun 6 is used to spray the acid agent into the flue pipe 3, thereby achieving the purpose of neutralizing the ammonia-containing flue gas.

[0039] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A device for controlling ammonia escape at the end of flue gas in a waste incineration power plant, characterized in that: The device includes a dosing tank (1), a storage tank (2), and a flue pipe (3). The dosing tank (1) is equipped with a demineralized water pipe (11) and an acid pipe (12). The demineralized water pipe (11) is connected to an external demineralized water structure (4), and the acid pipe (12) is connected to an external acid structure (5). A first parallel pump group is provided between the dosing tank (1) and the storage tank (2). An atomizing spray gun (6) is provided inside the flue pipe (3). A second parallel pump group is provided between the liquid outlet of the storage tank (2) and the liquid inlet of the atomizing spray gun (6).

2. The ammonia escape control device at the end of flue gas in a waste incineration power plant according to claim 1, characterized in that: The first parallel pump set includes a first output pipe (7) with one end connected to the liquid outlet of the drug preparation tank (1), a first input pipe (71) connected to the liquid inlet of the drug storage tank (2), and a first centrifugal pump (72) symmetrically arranged between the drug preparation tank (1) and the drug storage tank (2). The liquid inlet of both first centrifugal pumps (72) is connected to one end of the first output pipe (7) through a first inlet pipe (73), and the liquid outlet of both first centrifugal pumps (72) is connected to one end of the first input pipe (71) through a first outlet pipe (74).

3. The ammonia escape control device at the end of flue gas in a waste incineration power plant according to claim 2, characterized in that: Valves are provided on the first output pipe (7), the first input pipe (71), the first liquid inlet pipe (73), and the first liquid outlet pipe (74).

4. The ammonia escape control device at the end of flue gas in a waste incineration power plant according to claim 1, characterized in that: The second parallel pump set includes a second output pipe (8) with one end connected to the liquid outlet of the medicine storage tank (2), a second input pipe (81) connected to the liquid inlet of the atomizing spray gun (6), and a second centrifugal pump (82) symmetrically arranged between the medicine storage tank (2) and the atomizing spray gun (6). The liquid inlet of both second centrifugal pumps (82) is connected to one end of the second output pipe (8) through the second inlet pipe (83), and the liquid outlet of both second centrifugal pumps (82) is connected to one end of the second input pipe (81) through the second outlet pipe (84).

5. The ammonia escape control device at the end of flue gas in a waste incineration power plant according to claim 4, characterized in that: Valves are provided on the second output pipe (8), the second input pipe (81), the second liquid inlet pipe (83), and the second liquid outlet pipe (84).

6. The ammonia escape control device at the end of flue gas in a waste incineration power plant according to claim 4, characterized in that: A circulation branch pipe (9) is also connected between the medicine storage tank (2) and the second input pipe (81), and a valve is provided on the circulation branch pipe (9).

7. The ammonia escape control device at the end of flue gas in a waste incineration power plant according to claim 4, characterized in that: The second input pipe (81) is also equipped with a pressure gauge (85) and a flow meter (86).

8. The ammonia escape control device at the end of flue gas in a waste incineration power plant according to claim 1, characterized in that: The exhaust end of the flue (3) is connected to an induced draft fan (31), the inlet end of the flue (3) is connected to a bag filter (32), and the inlet end of the bag filter (32) is connected to an external ammonia-containing flue gas emission structure (33).

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