Flue gas recirculation low-nitrogen denitration equipment

Abstract

The utility model discloses flue gas recirculation low-nitrogen denitration equipment, which relates to the technical field of flue gas purification, and comprises a combustion chamber, one end of the combustion chamber is provided with a desulfurization bin, one end of the desulfurization bin is provided with a spraying mechanism, the bottom end of the desulfurization bin is fixedly connected with a waste water tank, the inside of the desulfurization bin is fixedly connected with a ceramic substrate, and the ceramic substrate is fixedly connected with a flue gas inlet. According to the utility model, the desulfurization bin, the waste water tank, the ceramic base body, the honeycomb holes and the denitration catalyst are matched, condensate water generated after desulfurization reaction can be stored through the waste water tank, and the denitration catalyst can be stored in the ceramic base body through the waste water tank; the honeycomb pore structure on the surface of the ceramic matrix is beneficial to full mixing and contact of nitrogen oxide and a reducing agent in flue gas on the surface of the catalyst, so that the denitration efficiency is improved, the ceramic matrix can resist erosion of acidic or alkaline chemical substances generated by reaction, and the service life of the catalyst is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of flue gas purification, and particularly relates to a flue gas recirculation low-nitrogen denitration device. Background Technique

[0002] Traditional flue gas denitration technologies, such as selective catalytic reduction (SCR) and selective non-catalytic reduction (SNCR), although can reduce emissions to a certain extent, have problems such as large equipment investment, high operating costs, and unstable denitration efficiency. Therefore, developing an efficient and economical flue gas recirculation low-nitrogen denitration device is of great significance for controlling emissions in industrial flue gas and achieving the dual goals of environmental protection and economy.

[0003] Patent publication number CN113289482A discloses a retractable in-furnace denitration device arranged on the top of a boiler, which is characterized in that it includes at least one retractable spray gun, and the retractable spray gun is vertically arranged on the top of the waste heat boiler furnace for spraying denitration solution into the waste heat boiler furnace.

[0004] In order to solve the problems of poor mixing effect and low denitration efficiency in the existing in-furnace denitration technology's spray gun arrangement method, the existing technology adjusts the barrel height according to the flue gas temperature, always keeps the injection point in the optimal reaction temperature range of the reducing agent, raises the in-furnace denitration efficiency to 55% - 65%, and improves the denitration reaction efficiency; at the same time, it saves the usage of reducing agents such as ammonia water and urea, and reduces the operating cost for treatment, but there will still be a situation where chemical reactions occur between the reducing agent and the flue gas to produce acidic or alkaline substances, which will further lead to the problem of acidic or alkaline substances eroding the furnace body. Content of the Utility Model

[0005] The purpose of the utility model is to provide a flue gas recirculation low-nitrogen denitration device to solve the problems raised in the above background technique.

[0006] To solve the above technical problems, the technical solution adopted by the utility model is:

[0007] A flue gas recirculation low-nitrogen denitration device includes a combustion chamber, one end of the combustion chamber is provided with a desulfurization chamber, and one end of the desulfurization chamber is provided with a spraying mechanism.

[0008] The bottom end of the desulfurization chamber is fixedly connected with a waste water tank, the inside of the desulfurization chamber is fixedly connected with a ceramic matrix, the surface of the ceramic matrix is provided with honeycomb holes, and a denitration catalyst is fixedly connected inside the honeycomb holes.

[0009] A further improvement of the technical solution of the present utility model lies in that: a hatch is fixedly connected to one side of the combustion chamber, a refractory glass is fixedly connected to one place on the surface of the hatch, and a handle is fixedly connected to another place on the surface of the hatch. By providing the refractory glass, the staff can observe the internal condition of the combustion chamber.

[0010] A further improvement of the technical solution of the present utility model lies in that: a flue gas pipe is fixedly connected to one place at the top of the combustion chamber, a heating device is fixedly connected to the end of the flue gas pipe, and the heating device is fixedly connected to the desulfurization bin. The heating device can heat the flue gas in the flue gas pipe to fully reduce the flue gas.

[0011] A further improvement of the technical solution of the present utility model lies in that: a circulation fan is fixedly connected to another place at the top of the combustion chamber, an intake pipe is fixedly connected to the input end of the circulation fan, one end of the intake pipe is fixedly connected to the flue gas pipe, an exhaust pipe is fixedly connected to the output end of the circulation fan, and one end of the exhaust pipe is fixedly connected to the combustion chamber. By means of the circulation fan, part of the flue gas is re-introduced into the combustion chamber to enable the flue gas to burn twice, so as to reduce the emission of nitrogen oxides.

[0012] A further improvement of the technical solution of the present utility model lies in that: the spraying mechanism includes an ammonia water tank, a pressure pump, and a spraying pipe. A water suction pipe is fixedly connected to the input end of the pressure pump, and one end of the water suction pipe is fixedly connected to the ammonia water tank. By providing the ammonia water tank, the raw material ammonia water required for the reduction reaction can be stored.

[0013] A further improvement of the technical solution of the present utility model lies in that: a water delivery pipe is fixedly connected to the output end of the pressure pump, and one end of the water delivery pipe extends into the desulfurization bin and is fixedly connected to the spraying pipe. The pressure pump pumps the ammonia water out of the ammonia water tank and pressurizes it to send it into the spraying pipe.

[0014] A further improvement of the technical solution of the present utility model lies in that: a spray head is fixedly connected to the bottom end of the spraying pipe, a fixing rod is fixedly connected to the outside of the spraying pipe, and one end of the fixing rod is fixedly connected to the desulfurization bin. The ammonia water is sprayed out through the spray head to mix the ammonia water with the denitration catalyst and carry out a catalytic reduction reaction with the flue gas.

[0015] Due to the adoption of the above technical solution, the technical progress achieved by the present utility model compared with the prior art is:

[0016] 1. The utility model provides a flue gas recirculation low-nitrogen denitration device, which adopts the cooperation of a desulfurization bin, a waste water tank, a ceramic matrix, honeycomb holes and a denitration catalyst. The waste water tank can store the condensed water generated after the desulfurization reaction. The honeycomb hole structure on the surface of the ceramic matrix helps the nitrogen oxides and reducing agent in the flue gas to be fully mixed and contacted on the surface of the denitration catalyst, thereby improving the denitration efficiency. Moreover, the ceramic matrix can resist the erosion of acidic or alkaline chemical substances generated by the reaction and extend the service life of the catalyst.

[0017] 2. The utility model provides a flue gas recirculation low-nitrogen denitration device, which adopts the cooperation of a combustion chamber, a hatch door, a refractory glass, a handle, a flue gas pipeline, a heating device, a circulation fan, an air suction pipe and an exhaust pipe. The circulation fan re-introduces part of the flue gas into the combustion chamber to enable the flue gas to burn twice, so as to reduce the emission of nitrogen oxides. The heating device can heat the flue gas in the flue gas pipeline to fully reduce the flue gas.

[0018] 3. The utility model provides a flue gas recirculation low-nitrogen denitration device, which adopts a spraying mechanism, an ammonia water tank, a water suction pipe, a pressure pump, a water delivery pipe, a spraying pipe, a spray head and a fixing rod. The ammonia water tank stores the reducing agent ammonia water. The pressure pump pumps out the ammonia water from the ammonia water tank and pressurizes it to send it into the spraying pipe. The spray head sprays out the ammonia water, so that the ammonia water is mixed with the denitration catalyst and undergoes a catalytic reduction reaction with the flue gas to generate nitrogen and water vapor. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a three-dimensional structural schematic diagram of the present utility model;

[0020] Figure 2 is a structural schematic diagram of the device combustion chamber of the present utility model;

[0021] Figure 3 is a structural schematic diagram of the interior of the desulfurization bin of the present utility model;

[0022] Figure 4 is a structural schematic diagram of the spraying mechanism of the present utility model;

[0023] Figure 5 is a schematic diagram of the honeycomb holes of the present utility model.

[0024] In the figure: 1. Combustion chamber; 11. Hatch door; 12. Refractory glass; 13. Handle; 14. Flue gas pipeline; 15. Heating device; 16. Circulation fan; 17. Air suction pipe; 18. Exhaust pipe; 2. Desulfurization bin; 21. Waste water tank; 22. Ceramic matrix; 23. Honeycomb holes; 24. Denitration catalyst; 3. Spraying mechanism; 31. Ammonia water tank; 32. Water suction pipe; 33. Pressure pump; 34. Water delivery pipe; 35. Spraying pipe; 36. Spray head; 37. Fixing rod. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] The following further elaborates on the present utility model in conjunction with embodiments:

[0026] Embodiment 1

[0027] As Figures 1-5 shown, the present utility model provides a flue gas recirculation low-nitrogen denitration device, including a combustion chamber 1. One end of the combustion chamber 1 is provided with a desulfurization chamber 2. One end of the desulfurization chamber 2 is provided with a spraying mechanism 3. The bottom end of the desulfurization chamber 2 is fixedly connected with a waste water tank 21. Inside the desulfurization chamber 2 is fixedly connected with a ceramic matrix 22. The surface of the ceramic matrix 22 is provided with honeycomb holes 23. Inside the honeycomb holes 23 is fixedly connected with a denitration catalyst 24.

[0028] In this embodiment, the waste water tank 21 can store the condensed water generated after the desulfurization reaction. The honeycomb hole 23 structure on the surface of the ceramic matrix 22 helps the nitrogen oxides and reducing agents in the flue gas to be fully mixed and contacted on the surface of the denitration catalyst 24, thereby improving the denitration efficiency. And the ceramic matrix 22 can resist the erosion of the acidic or alkaline chemical substances generated by the reaction and extend the service life of the catalyst.

[0029] Embodiment 2

[0030] As Figures 1-5 shown, on the basis of Embodiment 1, the present utility model provides a technical solution: Preferably, one side of the combustion chamber 1 is fixedly connected with a hatch 11. One place on the surface of the hatch 11 is fixedly connected with a refractory glass 12. Another place on the surface of the hatch 11 is fixedly connected with a handle 13. One place at the top end of the combustion chamber 1 is fixedly connected with a flue gas pipeline 14. The end of the flue gas pipeline 14 is fixedly connected with a heating device 15. The heating device 15 is fixedly connected with the desulfurization chamber 2. Another place at the top end of the combustion chamber 1 is fixedly connected with a circulation fan 16. The input end of the circulation fan 16 is fixedly connected with an air suction pipe 17. One end of the air suction pipe 17 is fixedly connected with the flue gas pipeline 14. The output end of the circulation fan 16 is fixedly connected with an exhaust pipe 18. One end of the exhaust pipe 18 is fixedly connected with the combustion chamber 1.

[0031] In this embodiment, the circulation fan 16 re-introduces part of the flue gas into the combustion chamber 1 to enable the flue gas to burn twice, so as to reduce the emission of nitrogen oxides. The heating device 15 can heat the flue gas in the flue gas pipeline 14 to fully reduce the flue gas.

[0032] Embodiment 3

[0033] As Figures 1-5As shown, on the basis of Embodiment 1, the present utility model provides a technical solution: Preferably, the spraying mechanism 3 includes an ammonia water tank 31, a pressure pump 33, and a spray pipe 35. The input end of the pressure pump 33 is fixedly connected with a water suction pipe 32, one end of the water suction pipe 32 is fixedly connected with the ammonia water tank 31, the output end of the pressure pump 33 is fixedly connected with a water delivery pipe 34, one end of the water delivery pipe 34 extends into the interior of the desulfurization chamber 2 and is fixedly connected with a spray pipe 35, the bottom end of the spray pipe 35 is fixedly connected with a spray head 36, and a fixing rod 37 is fixedly connected to the outer side of the spray pipe 35, and one end of the fixing rod 37 is fixedly connected with the desulfurization chamber 2.

[0034] In this embodiment, the ammonia water tank 31 can store the reducing agent ammonia water. The ammonia water is pumped out of the ammonia water tank 31 by the pressure pump 33 and pressurized and sent into the spray pipe 35. The ammonia water is sprayed out by the spray head 36, so that the ammonia water is mixed with the denitration catalyst 24 and undergoes a catalytic reduction reaction with the flue gas to generate nitrogen and water vapor.

[0035] Next, the working principle of the flue gas recirculation low-nitrogen denitration equipment will be specifically described.

[0036] As Figures 1-5 shown, when the equipment is in use, the flue gas generated by combustion is discharged into the interior of the desulfurization chamber 2 through the flue gas pipe 14. After the flue gas enters the flue gas pipe 14, the circulation fan 16 reintroduces part of the flue gas into the combustion chamber 1, so that the flue gas can be burned again to reduce the emission of nitrogen oxides. The heating device 15 can heat the flue gas in the flue gas pipe 14 to make the flue gas fully reduced. The ammonia water is pumped out of the ammonia water tank 31 by the pressure pump 33 and pressurized and sent into the spray pipe 35. The ammonia water is sprayed out by the spray head 36, so that the ammonia water is mixed with the denitration catalyst 24 and undergoes a catalytic reduction reaction with the flue gas to generate nitrogen and water vapor. The waste water tank 21 can store the condensed water generated after the denitration reaction. The honeycomb hole 23 structure on the surface of the ceramic matrix 22 helps the nitrogen oxides and the reducing agent in the flue gas to be fully mixed and contacted on the surface of the denitration catalyst 24, thereby improving the denitration efficiency. Moreover, the ceramic matrix 22 can resist the erosion of the acidic or alkaline chemical substances generated by the reaction and extend the service life of the catalyst.

[0037] The above has generally described the present utility model in detail. However, based on the present utility model, some modifications or improvements can be made, which are obvious to those of ordinary skill in the art. Therefore, the modifications or improvements made without departing from the spirit of the present utility model are within the protection scope of the present utility model.

Claims

1. A flue gas recirculation low nitrogen denitrification device, comprising a combustion chamber (1), characterized in that: A desulfurization chamber (2) is provided at one end of the combustion chamber (1), and a spraying mechanism (3) is provided at one end of the desulfurization chamber (2); The bottom end of the desulfurization bin (2) is fixedly connected to a wastewater tank (21), the interior of the desulfurization bin (2) is fixedly connected to a ceramic matrix (22), the surface of the ceramic matrix (22) is provided with honeycomb holes (23), and the interior of the honeycomb holes (23) is fixedly connected to a denitration catalyst (24).

2. A flue gas recirculation low nitrogen denitrification equipment according to claim 1, characterized in that: A hatch (11) is fixedly connected to one side of the combustion chamber (1), a fire-resistant glass (12) is fixedly connected to one portion of the surface of the hatch (11), and a handle (13) is fixedly connected to another portion of the surface of the hatch (11).

3. The flue gas recirculation low nitrogen denitrification equipment according to claim 1, characterized in that: A flue gas pipe (14) is fixedly connected to the top of the combustion chamber (1), a heating device (15) is fixedly connected to the end of the flue gas pipe (14), and the heating device (15) is fixedly connected to the desulfurization bin (2).

4. The flue gas recirculation low nitrogen denitrification equipment according to claim 1, characterized in that: A circulating fan (16) is fixedly connected to another point on the top of the combustion chamber (1); an input end of the circulating fan (16) is fixedly connected to an air intake pipe (17); one end of the air intake pipe (17) is fixedly connected to a flue gas duct (14); an output end of the circulating fan (16) is fixedly connected to an exhaust pipe (18); one end of the exhaust pipe (18) is fixedly connected to the combustion chamber (1).

5. The flue gas recirculation low nitrogen denitrification equipment according to claim 1, characterized in that: The spray mechanism (3) comprises an ammonia water tank (31), a booster pump (33), and a spray pipe (35); the input end of the booster pump (33) is fixedly connected to a water pump (32); one end of the water pump (32) is fixedly connected to the ammonia water tank (31).

6. The flue gas recirculation low nitrogen denitrification equipment according to claim 5, characterized in that: The output end of the booster pump (33) is fixedly connected to a water pipe (34), one end of which extends to the interior of the desulfurization bin (2) and is fixedly connected to a spray pipe (35).

7. The flue gas recirculation low nitrogen denitrification equipment according to claim 5, characterized in that: The bottom end of the spray pipe (35) is fixedly connected to a spray head (36), the outer side of the spray pipe (35) is fixedly connected to a fixing rod (37), and one end of the fixing rod (37) is fixedly connected to the desulfurization bin (2).

Images