Desulfurization, denitration and dust removal integrated device

Abstract

The invention discloses a desulfurization, denitrification and dust removal integrated device which comprises a tower front flue, a desulfurization reaction tower, a communication flue, a ceramic filter tube dust remover, a tail discharge flue and an induced draft fan which are sequentially connected according to a flue gas treatment process, wherein the induced draft fan is mounted on the tail discharge flue and is used for leading out and discharging flue gas; an ammonia spraying device and a desulfurizing agent feeding device are sequentially connected to the tower front flue from front to back in the flue gas advancing direction; the ash discharging end of the ceramic filter tube dust remover is connected with a fluidization chute device; the ash outlet end of the fluidization chute device is respectively connected with a circulating humidifying device and a waste ash conveying and storing device; wherein the discharge end of the circulating humidifying device is communicated with the desulfurization reaction tower, and the circulating humidifying device is provided with a process water adjusting and spraying device for humidifying circulating ash in the circulating humidifying device. According to the method, various pollutants can be efficiently and synchronously removed, and the problems that the requirement for the quality of a desulfurizing agent is high, the calcium-sulfur ratio is high, and the desulfurizing efficiency and the utilization rate of the desulfurizing agent are low are effectively solved.

Description

Technical Field

[0001] The invention relates to an integrated desulfurization, denitrification and dust removal device, belonging to the technical field of flue gas treatment. Background Art

[0002] Industrial kilns are not only large energy consumers, but also serious air pollutants, and are one of the key industrial pollution control industries in my country. The comprehensive treatment of industrial kiln flue gas pollutants is not only a key measure to protect the ecological environment and improve people's quality of life, but also has important significance for promoting the structural adjustment and sustainable development of my country's industrial kiln industry.

[0003] At present, the commonly used flue gas treatment process routes for industrial furnaces include SCR denitrification, dry desulfurization, semi-dry desulfurization + bag filter, wet desulfurization + wet electrostatic precipitator, etc. The process is relatively complicated, the operating cost is high, and it is impossible to remove multiple pollutants simultaneously. Even if there is technology to achieve simultaneous removal, it also faces the problem of high quality requirements for desulfurizers, which need to be ground before use (purity ≥ 93%, specific surface area ≥ 30m 2 / g), high calcium-sulfur ratio (≥3.0), low desulfurization efficiency and desulfurizer utilization rate, etc.

[0004] From the perspective of technical and economic requirements, it is particularly necessary to develop a more efficient and economical integrated desulfurization, denitrification and dust removal device suitable for industrial kiln flue gas. Summary of the invention

[0005] In order to solve the shortcomings of the prior art, the present invention provides an integrated desulfurization, denitrification and dust removal device, which can achieve efficient and synchronous removal of multiple pollutants, and effectively solve the problems of high quality requirements for desulfurizers, high calcium-sulfur ratio, low desulfurization efficiency and desulfurizer utilization rate.

[0006] The technical solution adopted by the present invention is:

[0007] An integrated desulfurization, denitrification and dust removal device, comprising a tower front flue, a desulfurization reaction tower, a connecting flue, a ceramic filter tube dust collector, a tail exhaust flue and an induced draft fan installed on the tail exhaust flue for leading the flue gas out for discharge, which are sequentially connected according to the flue gas treatment process;

[0008] Along the flue gas forward direction, an ammonia injection device and a desulfurizer feeding device are connected in sequence from front to back on the flue gas duct in front of the tower;

[0009] A fluidized chute device is connected to the ash discharge end of the ceramic filter tube dust collector; a circulating humidification device and a waste ash conveying and storage device are respectively connected to the ash discharge end of the fluidized chute device;

[0010] Among them, the discharge end of the circulating humidification device is connected to the desulfurization reaction tower, and is provided with a process water regulating injection device for humidifying the circulating ash in the circulating humidification device.

[0011] Preferably, the ammonia injection device comprises an ammonia inlet pipe, a dilution air duct, an ammonia-air mixer, an ammonia distribution valve group and an ammonia injection grid;

[0012] The ammonia inlet pipe and the dilution air pipe are connected to the air inlet end of the ammonia-air mixer, the ammonia distribution valve group is connected to the air outlet end of the ammonia-air mixer, and the ammonia spray grid is installed in the flue in front of the tower and connected to the ammonia distribution valve group;

[0013] Along the ammonia inlet direction, an ammonia cut-off valve, an ammonia flow meter, an ammonia regulating valve and an ammonia check valve are installed in sequence from front to back on the ammonia inlet pipe;

[0014] Along the air inlet direction, two groups of dilution air intake branches are arranged at the front end of the dilution air duct, and the first filter, the first muffler, the dilution fan, the first flexible connecting pipe, and the first check valve are installed on the two intake branches from front to back; a dilution air flow meter is installed on the dilution air duct.

[0015] Preferably, the desulfurizing agent feeding device comprises a desulfurizing agent feeding device and a desulfurizing agent conveying device;

[0016] The desulfurizer feeding device comprises a desulfurizer silo, on which a first silo top dust collector and a first radar level meter are installed; a discharge end of the desulfurizer silo is provided with a discharge pipe connected to the desulfurizer conveying device, and a first gate valve and a variable frequency feeder are sequentially installed on the discharge pipe along the discharge direction;

[0017] The desulfurizer conveying device includes a weighing device and a plurality of first Roots blowers, a weighing flexible connecting pipe connected to the discharge end of the variable frequency feeder is installed on the weighing device; a variable frequency screw conveyor is arranged at the discharge end of the weighing device, a discharge pipe is arranged at the discharge end of the variable frequency screw conveyor, a rotary valve, a first accelerator and a nozzle are sequentially installed on the discharge pipe along the discharge direction, the plurality of first Roots blowers are all connected to the air inlet end of the first accelerator, and the nozzle is installed on the flue in front of the tower and connected to the flue in front of the tower.

[0018] Preferably, a first rotary ash discharge valve is provided at the discharge end of the desulfurization reaction tower.

[0019] Preferably, the ceramic filter tube dust collector comprises a plurality of dust removal units, each of which comprises a shell and an ash hopper installed at the bottom of the shell, and a flower plate is arranged in each dust removal unit, the flower plate divides the shell into an upper chamber and a lower chamber, and the upper chambers of the plurality of dust removal units are connected, and the lower chambers are also connected; the connecting flue is connected to the lower chamber of one of the dust removal units located outside, and the tail exhaust flue is connected to the upper chamber of another dust removal unit located outside;

[0020] A number of ceramic filter tubes are installed on the flower plate, and a plurality of spray valve groups for cleaning the ceramic filter tubes are installed in the upper chamber; each spray valve group includes a sub-cylinder fixed in the upper chamber, the sub-cylinder is divided into a plurality of chambers, a spray pipe corresponding to the ceramic filter tube is arranged at the bottom of each chamber, and a plurality of pulse valves are installed at the top of the chamber through a short tube, and the short tube is connected to an external air supply pipeline.

[0021] Preferably, a chamber outlet switch baffle door and a chamber inlet adjustment baffle door are respectively provided in the upper and lower chambers of the shell, and the chamber outlet switch baffle door and the chamber inlet adjustment baffle door are located between the upper chamber connecting pipe and the lower chamber connecting pipe.

[0022] Preferably, the fluidizing chute device comprises a chute connected to the ash discharge end of the ceramic filter tube dust collector and a fluidizing air system for fluidizing the ash body in the chute;

[0023] The fluidizing air system comprises a fluidizing air main pipe, an air inlet pipe of the fluidizing air main pipe is connected to two fluidizing air branch pipes, and a plurality of fluidizing air inlet branch pipes connected to the chute are arranged on the fluidizing air main pipe;

[0024] A second filter, a second silencer, a fluidizing fan, a second flexible connecting pipe and a second check valve are sequentially installed on each fluidizing air branch pipe along the fluidizing air inlet direction;

[0025] A heat exchanger for adjusting the fluidizing air temperature is installed on the fluidizing air main pipe.

[0026] Preferably, the circulating humidification device includes a mixer whose feed inlet is connected to the ash outlet end of the fluidized chute device and whose outlet is connected to the desulfurization reaction tower, and a circulating ash flow cut-off valve and a circulating ash flow control valve are sequentially arranged on the connecting pipe between the mixer and the ash outlet end of the fluidized chute device along the circulating ash discharge direction.

[0027] Preferably, the process water regulating injection device comprises a water tank and a water outlet pipe, a water inlet pipe is arranged on the water tank, and a process water cut-off valve is installed on the water inlet pipe;

[0028] Two water outlet branches are also provided on the water tank, the water outlet ends of the water outlet branches are connected to the water inlet ends of the water outlet pipes, and a pump inlet switch valve, a pump inlet filter, a water pump and a pump outlet check valve are sequentially installed on each water outlet branch along the reverse direction of the water flow;

[0029] A pneumatic switch valve, a first flow meter, a first regulating valve and a first pressure transmitter are sequentially installed on the water outlet pipe along the water flow direction, and a spray gun is installed at the water outlet end of the water outlet pipe, and the spray gun is installed on the top of the circulating humidification device and is connected to the circulating humidification device;

[0030] A pressure regulating pipe is also provided on the water tank, one end of which is connected to the water tank, and the other end is connected to the water outlet pipe between the water outlet branch pipe and the pneumatic switch valve. A second regulating valve is installed on the pressure regulating pipe.

[0031] Preferably, the waste ash conveying and storage device comprises a waste bin and an ash conveying device, and the ash conveying device comprises a plurality of second Roots blowers;

[0032] A second silo top dust collector and a second radar level meter are installed on the waste silo; an ash conveying pipe connected to the ash outlet end of the fluidizing chute device is also provided on the waste silo, and a second gate valve, a second rotary ash discharge valve and a third accelerator are sequentially installed on the ash conveying pipe along the forward direction of the waste ash, and a plurality of second Roots blowers are all connected to the air inlet end of the third accelerator;

[0033] An ash discharge pipe is arranged at the bottom of the waste bin, and a third gate valve, a pneumatic shut-off valve and a bulk loader are sequentially installed on the ash discharge pipe along the forward direction of the waste ash.

[0034] The beneficial effects of the present invention are:

[0035] The device has the advantages of simple process, small footprint, online non-stop maintenance, simple maintenance, long service life, lower one-time investment and operating costs, and can remove multiple pollutants simultaneously. It has low requirements on the quality of desulfurizer (purity ≥ 85%, specific surface area ≥ 15m 2 / g), lower calcium-sulfur ratio (≤2.0), higher desulfurization efficiency and desulfurizer utilization rate, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a structural schematic diagram of the integrated device;

[0037] Figure 2 This is a schematic diagram of the structure of a ceramic filter tube dust collector;

[0038] Figure 3 It is a schematic diagram of the structure of an ammonia injection device;

[0039] Figure 4 This is a schematic diagram of the structure of the desulfurizer feeding device;

[0040] Figure 5 It is a schematic diagram of the structure of the fluidized chute device, the circulating humidification device and the waste ash conveying and storage device;

[0041] Figure 6 This is a schematic diagram of the structure of the process water regulation injection device.

[0042] Reference numerals:

[0043] 1. Desulfurization reaction tower; 101. First rotary ash discharge valve;

[0044] 2. Ceramic filter tube dust collector; 21. Shell; 22. Ash hopper; 23. Flower plate; 24. Ceramic filter tube; 25. Spray valve group; 251. Air cylinder; 252. Pulse valve; 253. Spray pipe; 26. Adjustable damper door for chamber inlet; 27. Switch damper door for chamber outlet;

[0045] 3. Ammonia injection device; 31. Ammonia shut-off valve; 32. Ammonia flowmeter; 33. Ammonia regulating valve; 34. Ammonia check valve; 35. Dilution fan; 351. First filter; 352. First silencer; 353. First flexible connecting pipe; 354. First check valve; 36. Dilution air flowmeter; 37. Ammonia-air mixer; 38. Ammonia distribution valve group; 39. Ammonia spray grid;

[0046] 4. Desulfurizing agent feeding device; 41. Desulfurizing agent silo; 411. First silo top dust collector; 412. First radar level meter; 42. First gate valve; 43. Frequency conversion feeder; 44. Weighing flexible connecting pipe; 45. Weighing device; 46. Frequency conversion screw conveyor; 47. Rotary valve; 48. First accelerator; 49. First Roots blower; 410. Nozzle;

[0047] 5. Fluidizing chute device; 51. chute; 52. fluidizing fan; 521. second filter; 522. second silencer; 523. second flexible connecting pipe; 524. second check valve; 53. heat exchanger;

[0048] 6. Circulating humidification device; 61. Circulating ash flow cut-off valve; 62. Circulating ash flow control valve; 63. Mixer;

[0049] 7. Process water regulating injection device; 71. Process water cut-off valve; 72. Water tank; 73. Water pump; 731. Pump inlet switch valve; 732. Pump inlet filter; 733. Pump outlet check valve; 74. Pneumatic switch valve; 75. First regulating valve; 76. Second regulating valve; 77. First flow meter; 78. First pressure transmitter; 79. Spray gun;

[0050] 8. Waste ash conveying and storage device; 81. Conveying device; 811. Second gate valve; 812. Second rotary ash discharge valve; 813. Second accelerator; 814. Second Roots blower; 82. Waste bin; 821. Second bin top dust collector; 822. Second radar level meter; 823. Third gate valve; 824. Pneumatic shut-off valve; 825. Bulk loader;

[0051] 9. Induced draft fan;

[0052] 10. Smoke duct in front of the tower;

[0053] 11. Connecting flue;

[0054] 12. Tail exhaust duct. DETAILED DESCRIPTION

[0055] The present invention will be specifically described below in conjunction with the accompanying drawings and embodiments.

[0056] An integrated desulfurization, denitrification and dust removal device, such as Figure 1 As shown, it includes a front-tower flue 10, a desulfurization reaction tower 1, a connecting flue, a ceramic filter tube dust collector 2, a tail exhaust flue 12 and an induced draft fan 9 installed on the tail exhaust flue 12 for leading the flue gas to the chimney for discharge, which are connected in sequence according to the flue gas treatment process; along the forward direction of the flue gas, an ammonia injection device 3 and a desulfurizer feeding device 4 are connected in sequence from front to back on the front-tower flue 10; a fluidizing chute device 5 is connected to the ash discharge end of the ceramic filter tube dust collector 2; the ash discharge end of the fluidizing chute device 5 is respectively connected to a circulating humidification device and a waste ash conveying and storage device 8; wherein, the discharge end of the circulating humidification device is connected to the desulfurization reaction tower 1, and has a process water regulating injection device 7 for humidifying the circulating ash in the circulating humidification device 6.

[0057] In actual applications, pressure transmitters and temperature transmitters will be installed on each pipeline as needed.

[0058] like Figure 3 As shown, the ammonia injection device 3 includes an ammonia inlet pipe, a dilution air duct, an ammonia-air mixer 37, an ammonia distribution valve group 38 and an ammonia spraying grid 39; wherein, the ammonia inlet pipe and the dilution air duct are connected to the air inlet end of the ammonia-air mixer 37, the ammonia distribution valve group 38 is connected to the air outlet end of the ammonia-air mixer 37, and the ammonia spraying grid 39 is installed in the flue 10 in front of the tower and is connected to the ammonia distribution valve group 38; along the ammonia inlet direction, an ammonia cut-off valve 31, an ammonia flowmeter 32, an ammonia regulating valve 33 and an ammonia check valve 34 are installed in sequence from front to back on the ammonia inlet pipe; along the air inlet direction, two groups of dilution air inlet branches are arranged at the front end of the dilution air duct, and a first filter 351, a first muffler 352, a dilution fan 35, a first flexible connecting pipe 353, and a first check valve 354 are installed in sequence from front to back on the two air inlet branches; a dilution air flowmeter 36 is installed on the dilution air duct.

[0059] like Figure 4As shown, the desulfurizing agent feeding device 4 includes a desulfurizing agent feeding device 4 and a desulfurizing agent conveying device 81; wherein the desulfurizing agent feeding device 4 includes a desulfurizing agent silo 41, on which a first silo top dust collector 411 and a first radar level meter 412 are installed; a discharge end of the desulfurizing agent silo 41 is provided with a discharge pipe connected to the desulfurizing agent conveying device 81, on which a first gate valve 42 and a variable frequency feeder 43 are sequentially installed along the discharge direction; the desulfurizing agent conveying device 81 includes a weighing device 45 and a plurality of first rammers A Roots blower 49 is provided, and a weighing flexible connecting pipe 44 connected to the discharge end of the variable frequency feeder 43 is installed on the weighing device 45; a variable frequency screw conveyor 46 is provided at the discharge end of the weighing device 45, and a discharge pipe is provided at the discharge end of the variable frequency screw conveyor 46, and a rotary valve 47, a first accelerator 48 and a nozzle 410 are sequentially installed on the discharge pipe along the discharge direction, and multiple first Roots blowers 49 are all connected to the air inlet end of the first accelerator 48, and the nozzle 410 is installed on the flue 10 in front of the tower and is connected to the flue 10 in front of the tower.

[0060] like Figure 1 As shown, a first rotary ash discharge valve 101 is provided at the discharge end of the desulfurization reaction tower 1 .

[0061] like Figure 2 As shown, the ceramic filter tube dust collector 2 includes a plurality of dust removal units, each of which includes a shell 21 and an ash hopper 22 installed at the bottom of the shell 21, and a flower plate 23 is provided in each dust removal unit, the flower plate 23 divides the shell 21 into an upper chamber and a lower chamber, and the upper chambers of the plurality of dust removal units are connected, and the lower chambers are also connected; the connecting flue is connected to the lower chamber of one of the dust removal units located on the outside, and the tail exhaust flue 12 is connected to the upper chamber of another dust removal unit located on the outside; Several ceramic filter tubes 24 (carrying catalyst) are installed on the flower plate 23, and multiple groups of spray valve groups 25 for cleaning the ceramic filter tubes 24 are installed in the upper chamber; each group of spray valve groups 25 includes a sub-cylinder 251 fixed in the upper chamber, and the sub-cylinder 251 is divided into multiple chambers, and a spray pipe 253 corresponding to the ceramic filter tube 24 is arranged at the bottom of each chamber, and multiple pulse valves 252 are installed at the top of the chamber through a short pipe, and the short pipe is connected to the external air supply pipeline. The upper and lower chambers of the shell 21 are also respectively provided with a chamber outlet switch baffle door 27 and a chamber inlet adjustment baffle door 26, and the chamber outlet switch baffle door 27 and the chamber inlet adjustment baffle door 26 are located between the upper chamber connecting pipeline and the lower chamber connecting pipeline.

[0062] like Figure 5As shown, the fluidizing chute device 5 includes a chute 51 connected to the ash discharge end of the ceramic filter tube dust collector 2 and a fluidizing air system for fluidizing the ash body in the chute 51; the fluidizing air system includes a fluidizing air main pipe, the air inlet pipe of the fluidizing air main pipe is connected to two fluidizing air branch pipes, and a plurality of fluidizing air inlet branch pipes connected to the chute 51 are arranged on the fluidizing air main pipe; a second filter 521, a second muffler 522, a fluidizing fan 52, a second flexible connecting pipe 523 and a second check valve 524 are sequentially installed on each fluidizing air branch pipe along the fluidizing air inlet direction; a heat exchanger 53 for adjusting the fluidizing air temperature is installed on the fluidizing air main pipe, and the heat exchange pipe in the heat exchanger 53 is connected to the heating medium supply pipe, and the heating medium is used to heat the fluidizing air to reduce the temperature difference between the temperature in the fluidizing chute device 5 and the fluidizing air temperature, so as to prevent the ash body in the fluidizing chute device 5 from agglomerating.

[0063] like Figure 5 As shown, the circulating humidification device 6 includes a mixer 63 whose feed inlet is connected to the ash outlet end of the fluidized chute device 5 and whose outlet is connected to the desulfurization reaction tower 1, and a circulating ash flow cut-off valve 61 and a circulating ash flow control valve 62 are sequentially arranged on the connecting pipeline between the mixer 63 and the ash outlet end of the fluidized chute device 5 along the circulating ash discharge direction.

[0064] like Figure 5 As shown, the process water regulating injection device 7 includes a water tank 72 and a water outlet pipe. The water tank 72 is provided with a water inlet pipe, and the water inlet pipe is installed with a process water cut-off valve 71; the water tank 72 is also provided with two water outlet branches, the water outlet ends of the water outlet branches are connected with the water inlet end of the water outlet pipe, and a pump inlet switch valve 731, a pump inlet filter 732, a water pump 73 and a pump outlet check valve 733 are installed in sequence along the water flow direction on each water outlet branch; A pneumatic switch valve 74, a first flow meter 77, a first regulating valve 75 and a first pressure transmitter 78 are installed, and a spray gun 79 is installed at the water outlet end of the water outlet pipe, and the spray gun 79 is installed on the top of the circulating humidification device and connected with the circulating humidification device; a pressure regulating pipe is also arranged on the water tank 72, one end of the pressure regulating pipe is connected with the water tank 72, and the other end is connected with the water outlet pipe located between the water outlet branch pipe and the pneumatic switch valve 74, and a second regulating valve 76 is installed on the pressure regulating pipe.

[0065] like Figure 6As shown, the waste ash conveying and storage device 8 includes a waste bin 82 and an ash conveying device, and the ash conveying device includes a plurality of second Roots blowers 814; a second bin top dust collector 821 and a second radar level meter 822 are installed on the waste bin 82; an ash conveying pipe connected to the ash outlet end of the fluidizing chute device 5 is also provided on the waste bin 82, and a second gate valve 811, a second rotary ash discharge valve 812 and a third accelerator are sequentially installed on the ash conveying pipe along the forward direction of the waste ash, and the plurality of second Roots blowers 814 are all connected to the air inlet end of the third accelerator; an ash discharge pipe is provided at the bottom of the waste bin 82, and a third gate valve 823, a pneumatic shut-off valve 824 and a bulk loader 825 are sequentially installed on the ash discharge pipe along the forward direction of the waste ash.

[0066] The following is combined with Figure 1-6 The integrated device process provided in this embodiment is described.

[0067] Specifically, under the action of the induced draft fan 9, the flue gas from the industrial kiln enters the desulfurization reaction tower 1 through the front flue 10, and then enters the ceramic filter tube dust collector 2 through the connecting flue 11, completing the desulfurization, denitrification and dust removal process, and finally enters the chimney and is discharged into the atmosphere.

[0068] Ammonia passes through the regulating and metering valve group and enters the ammonia-air mixer 37. After being mixed with the dilution air, ammonia passes through the ammonia distribution valve group 38 and finally evenly enters the ammonia injection grid 39, and is sprayed into the flue 10 in front of the tower through the ammonia injection grid 39.

[0069] The desulfurizer (slaked lime) is stored in the desulfurizer silo 41. The first gate valve 42 and the variable frequency feeder 43 are opened, and the desulfurizer enters the weighing device 45 for weighing and metering. The variable frequency screw conveyor 46 is opened to adjust the speed by frequency to control the feeding amount. The rotary valve 47 is opened, and under the action of the first Roots blower 49 and the first accelerator 48, the desulfurizer is transported to the nozzle 410 and finally enters the flue 10 in front of the tower. The desulfurizer fully mixed with the flue gas enters the desulfurization reaction tower 1 with the flue gas, and reacts in the tower to remove SO2.

[0070] According to the flue gas flow direction, the ammonia spray grid 39 is in front and the nozzle 410 is behind, and the distance between them is not less than 3m. At the same time, the lower part of the desulfurization reaction tower 1 is connected to the first rotary ash discharge valve 101, which is opened regularly to discharge the ash at the bottom of the desulfurization reaction tower 1.

[0071] The flue gas enters the ceramic filter tube dust collector 2 from the connected flue 11, and then is adjusted and distributed through the chamber inlet regulating baffle door 26 to make the flue gas amount entering each chamber uniform; the ceramic filter tube 24 (loaded with catalyst) is fixed on the flower plate 23, and the dusty flue gas passes through the ceramic filter tube 24 from the outer surface to the inner surface; the dust in the flue gas is blocked on the surface of the ceramic filter tube 24. When the flour cake layer on the outer surface of the ceramic filter tube 24 accumulates to a certain extent, the injection valve group 25 is started to spray compressed air into the ceramic filter tube 24 through the injection pipe 253 to remove the flour cake layer adsorbed on the outer surface of the ceramic filter tube 24, and the fallen flour cake layer falls into the ash hopper 22. When the flue gas fully mixed with ammonia passes through the ceramic filter tube 24 from the outer surface to the inner surface, under the action of the catalyst inside the ceramic filter tube 24, the NO in the flue gas is x Reduction reaction with ammonia to remove NO x .

[0072] The number of shells 21 is not more than 6, and a chamber outlet switch baffle door 27 and a chamber inlet adjustment baffle door 26 are respectively provided in the upper and lower chambers of the shell 21, and the chamber outlet switch baffle door 27 and the chamber inlet adjustment baffle door 26 are located between the upper chamber connecting pipe and the lower chamber connecting pipe; in actual application, the chamber outlet switch baffle door 27 and the chamber inlet adjustment baffle door 26 in one of the shells 21 can be closed to achieve non-stop maintenance and online replacement of the filter tube.

[0073] The number of the sub-cylinders 251 is the same as the number of the shells 21 . The number of pulse valves 252 configured on each sub-cylinder 251 is no more than 25. The number of ceramic filter tubes 24 (loaded with catalyst) sprayed by each pulse valve 252 is no more than 20.

[0074] The ceramic filter tube 24 (loaded catalyst) is connected to the ash hopper 22 below the dust collector through the chute 51. The powder layer (desulfurization ash) in the ash hopper 22 falls into the chute 51 and flows toward the mixer 63 driven by the fluidizing air generated by the fluidizing fan 52. The heater heats the fluidizing air temperature to above 150°C. The interface between the fluidizing air inlet branch pipe and the chute 51 can be arranged at multiple points, and the interface spacing is not greater than 2.5m.

[0075] The tail end of the chute 51 is connected to the mixer 63 , and a circulating ash flow cut-off valve 61 and a circulating ash flow control valve 62 are arranged between the two. The circulating ash flow cut-off valve 61 is used for emergency quick cut-off, and the circulating ash flow control valve 62 is used to control the amount of circulating desulfurization ash entering the mixer 63 .

[0076] A spray gun 79 is installed on the top of the mixer 63. The water in the water tank 72 is pressurized by the water pump 73 to send the process water to the spray gun 79. The first regulating valve 75 controls the process water flow rate, and the second regulating valve 76 controls the process water pressure (required to be not less than 1.0 mPa). The spray gun 79 is a dual-fluid atomizing spray gun 79. After compressed air atomization, the water is evenly distributed on the surface of the circulating ash particles, and the humidification process is completed in the mixer 63.

[0077] The mixer 63 mechanically rotates to overflow the humidified circulating desulfurization ash into the desulfurization reaction tower 1. The water film formed on the surface of the circulating ash particles increases the evaporation surface area, making it easier for acidic gas molecules such as SO2 in the flue gas to condense, adsorb and ionize on the surface of the circulating ash particles. At the same time, the humidity of the flue gas increases, forming an optimal desulfurization reaction environment, which is very beneficial to improving the desulfurization efficiency. The circulating ash is pre-mixed, humidified and circulated multiple times in the mixer 63, and the effective utilization rate of the desulfurizer is very high.

[0078] After multiple cycles of use, the desulfurized ash is regularly discharged through the waste ash conveying and storage device 8. The second gate valve 811 and the second rotary ash discharge valve 812 are opened, and the desulfurized waste ash is sent to the waste bin 82 for storage under the action of the second Roots blower 814 and the second accelerator 813. The third gate valve 823, the pneumatic shut-off valve 824 and the bulk loader 825 are opened, and the desulfurized waste ash falls into the tank truck for transportation.

[0079] The above is only a preferred implementation of the patent of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the patent of the present invention. These improvements and modifications should also be regarded as the scope of protection of the patent of the present invention.

Claims

1. An integrated desulfurization, denitrification and dust removal device, comprising a tower front flue, a desulfurization reaction tower, a connecting flue, a ceramic filter tube dust collector, a tail exhaust flue and an induced draft fan installed on the tail exhaust flue for exhausting the flue gas, which are connected in sequence according to the flue gas treatment process, characterized in that: Along the flue gas forward direction, an ammonia injection device and a desulfurizer feeding device are connected in sequence from front to back on the flue gas duct in front of the tower; A fluidized chute device is connected to the ash discharge end of the ceramic filter tube dust collector; a circulating humidification device and a waste ash conveying and storage device are respectively connected to the ash discharge end of the fluidized chute device; Among them, the discharge end of the circulating humidification device is connected to the desulfurization reaction tower, and is provided with a process water regulating injection device for humidifying the circulating ash in the circulating humidification device.

2. The integrated desulfurization, denitrification and dust removal device according to claim 1 is characterized in that: The ammonia injection device includes an ammonia inlet pipe, a dilution air duct, an ammonia-air mixer, an ammonia distribution valve group and an ammonia injection grid; The ammonia inlet pipe and the dilution air pipe are connected to the air inlet end of the ammonia-air mixer, the ammonia distribution valve group is connected to the air outlet end of the ammonia-air mixer, and the ammonia spray grid is installed in the flue in front of the tower and connected to the ammonia distribution valve group; Along the ammonia inlet direction, an ammonia cut-off valve, an ammonia flow meter, an ammonia regulating valve and an ammonia check valve are installed in sequence from front to back on the ammonia inlet pipe; Along the air inlet direction, two sets of dilution air intake branches are arranged at the front end of the dilution air duct, and the first filter, the first muffler, the dilution fan, the first flexible connecting pipe, and the first check valve are sequentially installed on the two intake branches from front to back; A dilution air flow meter is installed on the dilution air duct.

3. The integrated desulfurization, denitrification and dust removal device according to claim 1 is characterized in that: The desulfurizing agent feeding device comprises a desulfurizing agent feeding device and a desulfurizing agent conveying device; The desulfurizer feeding device comprises a desulfurizer silo, on which a first silo top dust collector and a first radar level meter are installed; a discharge end of the desulfurizer silo is provided with a discharge pipe connected to the desulfurizer conveying device, and a first gate valve and a variable frequency feeder are sequentially installed on the discharge pipe along the discharge direction; The desulfurizer conveying device includes a weighing device and a plurality of first Roots blowers, a weighing flexible connecting pipe connected to the discharge end of the variable frequency feeder is installed on the weighing device; a variable frequency screw conveyor is arranged at the discharge end of the weighing device, a discharge pipe is arranged at the discharge end of the variable frequency screw conveyor, a rotary valve, a first accelerator and a nozzle are sequentially installed on the discharge pipe along the discharge direction, the plurality of first Roots blowers are all connected to the air inlet end of the first accelerator, and the nozzle is installed on the flue in front of the tower and connected to the flue in front of the tower.

4. The integrated desulfurization, denitrification and dust removal device according to claim 1 is characterized in that: A first rotary ash discharge valve is provided at the discharge end of the desulfurization reaction tower.

5. The integrated desulfurization, denitrification and dust removal device according to claim 1 is characterized in that: The ceramic filter tube dust collector includes a plurality of dust removal units, each of which includes a shell and an ash hopper installed at the bottom of the shell. A flower plate is provided in each dust removal unit, and the flower plate divides the shell into an upper chamber and a lower chamber. The upper chambers of the plurality of dust removal units are connected, and the lower chambers are also connected; the connecting flue is connected to the lower chamber of one of the dust removal units located outside, and the tail exhaust flue is connected to the upper chamber of another dust removal unit located outside; A number of ceramic filter tubes are installed on the flower plate, and a plurality of spray valve groups for cleaning the ceramic filter tubes are installed in the upper chamber; each spray valve group includes a sub-cylinder fixed in the upper chamber, the sub-cylinder is divided into a plurality of chambers, a spray pipe corresponding to the ceramic filter tube is arranged at the bottom of each chamber, and a plurality of pulse valves are installed at the top of the chamber through a short tube, and the short tube is connected to an external air supply pipeline.

6. The integrated desulfurization, denitrification and dust removal device according to claim 5, characterized in that: The upper and lower chambers of the shell are respectively provided with a chamber outlet switch baffle door and a chamber inlet adjustment baffle door; and the chamber outlet switch baffle door and the chamber inlet adjustment baffle door are located between the upper chamber connecting pipe and the lower chamber connecting pipe.

7. The integrated desulfurization, denitrification and dust removal device according to claim 1 is characterized in that: The fluidized chute device includes a chute connected to the ash discharge end of the ceramic filter tube dust collector and a fluidized air system for fluidizing the ash body in the chute; The fluidizing air system comprises a fluidizing air main pipe, an air inlet pipe of the fluidizing air main pipe is connected to two fluidizing air branch pipes, and a plurality of fluidizing air inlet branch pipes connected to the chute are arranged on the fluidizing air main pipe; A second filter, a second silencer, a fluidizing fan, a second flexible connecting pipe and a second check valve are sequentially installed on each fluidizing air branch pipe along the fluidizing air inlet direction; A heat exchanger for adjusting the fluidizing air temperature is installed on the fluidizing air main pipe.

8. The integrated desulfurization, denitrification and dust removal device according to claim 1, characterized in that: The circulating humidification device includes a mixer whose feed inlet is connected to the ash outlet of the fluidized chute device and whose outlet is connected to the desulfurization reaction tower. A circulating ash flow cut-off valve and a circulating ash flow control valve are sequentially arranged on the connecting pipeline between the mixer and the ash outlet of the fluidized chute device along the circulating ash outlet direction.

9. The integrated desulfurization, denitrification and dust removal device according to claim 1, characterized in that: The process water regulating and spraying device comprises a water tank and a water outlet pipe, a water inlet pipe is arranged on the water tank, and a process water cut-off valve is installed on the water inlet pipe; Two water outlet branches are also provided on the water tank, the water outlet ends of the water outlet branches are connected to the water inlet ends of the water outlet pipes, and a pump inlet switch valve, a pump inlet filter, a water pump and a pump outlet check valve are sequentially installed on each water outlet branch along the reverse direction of the water flow; A pneumatic switch valve, a first flow meter, a first regulating valve and a first pressure transmitter are sequentially installed on the water outlet pipe along the water flow direction, and a spray gun is installed at the water outlet end of the water outlet pipe, and the spray gun is installed on the top of the circulating humidification device and is connected to the circulating humidification device; A pressure regulating pipe is also provided on the water tank, one end of which is connected to the water tank, and the other end is connected to the water outlet pipe between the water outlet branch pipe and the pneumatic switch valve. A second regulating valve is installed on the pressure regulating pipe.

10. The integrated desulfurization, denitrification and dust removal device according to claim 1, characterized in that: The waste ash conveying and storage device comprises a waste material bin and an ash conveying device, and the ash conveying device comprises a plurality of second Roots blowers; A second silo top dust collector and a second radar level meter are installed on the waste silo; an ash conveying pipe connected to the ash outlet end of the fluidizing chute device is also provided on the waste silo, and a second gate valve, a second rotary ash discharge valve and a third accelerator are sequentially installed on the ash conveying pipe along the forward direction of the waste ash, and a plurality of second Roots blowers are all connected to the air inlet end of the third accelerator; An ash discharge pipe is arranged at the bottom of the waste bin, and a third gate valve, a pneumatic shut-off valve and a bulk loader are sequentially installed on the ash discharge pipe along the forward direction of the waste ash.

Images