Waste gas pretreatment device for cement kiln tail bag type dust collector

Abstract

The utility model discloses a waste gas pretreatment device for a cement kiln tail bag type dust collector. The waste gas pretreatment device comprises a kiln tail flue gas transfer chamber, a flue gas inlet pipeline, an SP waste heat boiler and the kiln tail bag type dust collector. And a heat exchanger is arranged between the kiln tail flue gas transfer chamber and the SP waste heat boiler and comprises a waste heat boiler water supply pipeline, a heat absorption finned tube, a boiler finned tube and a steam pipeline. According to the waste gas pretreatment device for the tail bag type dust collector of the cement kiln, under the action of continuous temperature difference, after a heat absorption pipe is in contact with waste gas, a layer of water drops can be condensed on the surface of a pipeline, and water is swept down through a sweeper, so that the humidity in the waste gas is reduced; furthermore, when the waste gas passes through the demisting baffle plate, liquid drops and smoke dust in the waste gas can be separated again, so that the humidity of the waste gas is further reduced, the waste gas enters the kiln tail dust collector after being subjected to multiple times of humidity reduction, the humidity and the dust content of the waste gas are obviously reduced at the moment, and the problem of bag pasting is greatly solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to cement production environmental protection equipment technical field, concretely is a kind of waste gas pretreatment device for cement kiln tail bag type dust collector. BACKGROUND

[0002] Cement kiln tail dust collector is the biggest dust collection equipment of cement enterprise, prone to bag paste problem, the main reasons of paste bag are as follows: the humidity of waste gas from raw material mill drying is too large, denitration ammonia escape increases waste gas dust tackiness, dust collector ash cleaning is not thorough and so on.Bag dust collector paste bag will lead to dust collection resistance increase, power consumption rise, dust collection efficiency decline, seriously need to replace dust collection bag during production, cause environmental protection cost and labor intensity increase.

[0003] In addition, cement kiln tail chimney waste gas temperature is generally between 160 DEG C~200 DEG C, directly external discharge, there is waste gas waste heat resource waste problem. UTILITARIAN CONTENT

[0004] (I) the technical problem solved

[0005] In view of the deficiencies of prior art, the utility model provides a kind of waste gas pretreatment device for cement kiln tail bag type dust collector, solve the problem of paste bag caused by the humidity of existing kiln tail dust collector waste smoke.

[0006] (II) technical scheme

[0007] To achieve the above object, the utility model provides the following technical scheme: a kind of waste gas pretreatment device for cement kiln tail bag type dust collector, including kiln tail flue gas transfer chamber, into smoke pipeline, SP waste heat boiler and kiln tail bag type dust collector.

[0008] Heat exchanger is arranged between kiln tail flue gas transfer chamber and SP waste heat boiler, the heat exchanger includes waste heat boiler feedwater pipe, heat-absorbing finned tube, boiler finned tube and steam pipe, wherein, heat-absorbing finned tube is located in kiln tail flue gas transfer chamber, and boiler finned tube is located in SP waste heat boiler.

[0009] The lower portion of heat-absorbing finned tube is provided with demisting baffle, and the both sides of demisting baffle are provided with sound wave soot blower for dust removal in the internal passage of demisting baffle.

[0010] Kiln tail flue gas transfer chamber is communicated with kiln tail bag type dust collector by smoke exhaust pipe, wherein, cold air valve is arranged on smoke exhaust pipe.

[0011] The bottom of kiln tail flue gas transfer chamber is provided with dust collecting hopper, and the dust collecting hopper is provided with rotary feeder, and the bottom of rotary feeder is provided with kiln dust recovery tank.

[0012] As a further preferred, further comprising a sweeper for cleaning the condensation water droplets on the surface of the heat absorbing finned tube, the sweeper is driven by an external sweeper motor.

[0013] As a further preferred, a ring-shaped water collecting groove is arranged below the sweeper, the water collecting groove is communicated with the kiln dust recovery tank through a drain pipe.

[0014] As a further preferred, a dryer is arranged in the middle and lower part of the drain pipe, the dryer comprises filter screens on the upper and lower sides and a drying layer in the middle part, and a detachable discharge port is arranged on the dryer.

[0015] As a further preferred, a flue gas pipeline access door is arranged on the kiln tail flue gas transfer chamber.

[0016] (Three) beneficial effects

[0017] The utility model provides a kind of waste gas pretreatment device for cement kiln tail bag type dust collector. With following beneficial effects:

[0018] The waste gas pretreatment device for cement kiln tail bag type dust collector, by setting heat exchanger, heat exchanger can utilize the waste heat in waste gas, reduce waste gas temperature of discharging, on the other hand, under the action of continuous temperature difference, after heat absorbing pipe is contacted with waste gas, a layer of water droplets is condensed on the surface of pipe, and water is swept down using sweeper, so as to reduce humidity in waste gas;Further, waste gas is separated again to liquid drop and smoke dust in waste gas when passing through demisting baffle, so as to further reduce humidity of waste gas, after humidification for multiple times, waste gas enters kiln tail dust collector again, at this time, humidity and dust content of waste gas are significantly reduced, so bag sticking problem is greatly reduced. ACCURACY

[0019] Figure 1 It is structure schematic view of the utility model;

[0020] Figure 2 It is side view of demisting baffle of the utility model.

[0021] In the drawing: 1, kiln tail flue gas transfer chamber;2, smoke inlet pipeline;3, SP waste heat boiler;4, kiln tail bag type dust collector;5, waste heat boiler water supply pipeline;6, heat absorbing finned tube;7, boiler finned tube;8, steam pipeline;9, demisting baffle;10, sonic sootblower;11, smoke exhaust pipeline;12, cold air valve;13, dust collecting hopper;14, rotary feeder;15, kiln dust recovery tank;16, sweeper motor;17, sweeper;18, water collecting groove;19, drain pipe;20, dryer;201, filter screen;202, drying layer;203, discharge port;21, access door. DETAILED DESCRIPTION

[0022] Clearly and completely describe the technical scheme in the embodiments of the utility model with reference to the drawings in the embodiments of the utility model, obviously, the described embodiments are only a part of the embodiments of the utility model, and not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the ordinary skilled in the art without making creative labor belong to the scope of the utility model protection.

[0023] As Figure 1 Indicated, the utility model provides a kind of technical scheme: a kind of waste gas pretreatment device for cement kiln tail bag type dust collector, including kiln tail flue gas transfer chamber 1, into smoke pipeline 2, SP waste heat boiler 3 and kiln tail bag type dust collector 4.

[0024] As Figure 1 Indicated, heat exchanger is arranged between kiln tail flue gas transfer chamber 1 and SP waste heat boiler 3, and the heat exchanger includes waste heat boiler feedwater pipe 5, heat absorption finned tube 6, boiler finned tube 7 and steam pipe 8, wherein heat absorption finned tube 6 is located in kiln tail flue gas transfer chamber 1, and boiler finned tube 7 is located in SP waste heat boiler 3.

[0025] As Figure 1 Indicated, it further includes the sweeper 17 for the condensate water droplet on the surface of heat absorption finned tube 6 is cleaned, and heat absorption finned tube 6 is a plurality of annular ducts that are connected in an up-down direction, and the inlet and outlet are respectively located at the head and tail, and the sweeper 17 is driven by the external cleaning motor 16, due to the temperature difference, the surface of heat absorption finned tube 6 will condense water droplet, and this part of water droplet is mainly due to the reason that humidity in waste gas is big, and condenses into bead when meeting cold, and the cleaning motor 16 is opened, and the sweeper (also called cleaning brush) 17 is rotated, to clean the surface of heat absorption finned tube 6, and the water droplet is swept off.

[0026] As Figure 1 Indicated, the lower portion of the sweeper 17 is provided with annular water collecting groove 18, and the water collecting groove 18 is communicated with kiln dust recovery tank 15 through drain pipe 19, and the water droplet is fallen into the lower water collecting groove 18.

[0027] As Figure 1 Indicated, the middle and lower portion of the drain pipe 19 is provided with dryer 20, and the dryer 20 includes filter screen 201 on the upper side and the lower side and drying layer 202 in the middle portion, and the drying layer 202 is block-shaped drying agent, for water absorption, and is replaced regularly through discharge port 203, and the dryer 20 is also provided with detachable discharge port 203, and the water droplet in the water collecting groove 18 is dried through the dryer 20 after being drained through the drain pipe 19, and finally is drained into the kiln dust recovery tank 15.

[0028] As Figures 1-2As shown, the lower part of the heat absorption finned tube 6 is provided with a demisting baffle 9, and the two sides of the demisting baffle 9 are provided with a sound wave soot blower 10 for dust removal of the internal passage of the demisting baffle 9. The demisting baffle 9 and the sound wave soot blower 10 are prior art and can be directly purchased. It should be noted that the sound wave soot blower 10 has multiple outlets which are respectively inserted into the passages of the demisting baffle 9.

[0029] As shown in Figure 1 The kiln tail flue gas transfer chamber 1 is communicated with the kiln tail bag type dust collector 4 through the exhaust gas pipeline 11, wherein the exhaust gas pipeline 11 is provided with a cold air valve 12.

[0030] As shown in Figure 1 The bottom of the kiln tail flue gas transfer chamber 1 is provided with a dust collecting hopper 13, and the dust collecting hopper 13 is provided with a rotary feeder 14, and the bottom of the rotary feeder 14 is provided with a kiln dust recovery tank 15.

[0031] As shown in Figure 1 The kiln tail flue gas transfer chamber 1 is provided with a flue gas pipeline maintenance door 21.

[0032] Meanwhile, the contents not described in detail in the specification all belong to the prior art known to those skilled in the art.

[0033] In use, the exhaust gas enters the kiln tail flue gas transfer chamber 1 through the smoke inlet pipeline 2, and the cold water is injected into the heat absorption finned tube 6 through the waste heat boiler feedwater pipeline 5. After the exhaust gas enters the heat absorption finned tube 6, it contacts the heat absorption finned tube 6. The waste heat in the exhaust gas is exchanged, and the heat is absorbed by the cold water in the pipeline, thereby reducing the temperature of the exhaust gas. The cold water absorbs heat, and then continues to absorb heat in the SP waste heat boiler 3 through the boiler finned tube 7, and finally converts into water vapor which is discharged into the waste heat power boiler through the steam pipeline 8, realizing waste heat utilization.

[0034] The cooled exhaust gas passes through the demisting baffle 9, and the liquid droplets and dust in the exhaust gas are separated again. The dried exhaust gas finally enters the kiln tail bag type dust collector 4 through the exhaust gas pipeline 11.

[0035] The sound wave soot blower 10 is turned on to shake off the liquid droplets and dust adsorbed in the passages of the demisting baffle 9 and drop into the dust collecting hopper 13 below, and then discharged into the kiln dust recovery tank 15 through the rotary feeder 14 for temporary storage.

[0036] In summary, the exhaust gas pretreatment device for the cement kiln tail bag type dust collector, by setting the heat exchanger, the heat exchanger can utilize the waste heat in the exhaust gas, reduce the exhaust gas temperature, on the other hand, under the action of the continuous temperature difference, the heat absorption pipe is contacted with the exhaust gas, and a layer of water droplets is condensed on the surface of the pipeline, and the water is swept down by the sweeper, so that the humidity in the exhaust gas is reduced; further, the exhaust gas passes through the demisting baffle, and the liquid droplets and smoke dust in the exhaust gas are separated again, so that the humidity of the exhaust gas is further reduced, and after the humidity is reduced for many times, the exhaust gas enters the kiln tail dust collector, at this time, the humidity and dust content of the exhaust gas are obviously reduced, so that the bag sticking problem is greatly reduced.

[0037] It should be noted that the electrical components appearing in this paper are all connected with the main controller and 220V or 380V mains electricity, and the main controller can be a conventional known device such as a computer, and its control principle, internal structure and control switch mode are all conventional means of the prior art, which are directly quoted here, and will not be described in detail, in this paper, relationship terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between the entities or operations. Moreover, the terms "include", "contain" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or includes elements inherent to such process, method, article or device.

[0038] Although the embodiments of the present application have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A device for exhaust gas pretreatment of a cement kiln tail bag filter, characterized by: The kiln tail flue gas transfer chamber (1), the smoke inlet pipeline (2), the SP waste heat boiler (3) and the kiln tail bag type dust collector (4) are included. The heat exchanger is arranged between the kiln tail flue gas transfer chamber (1) and the SP waste heat boiler (3), and includes the waste heat boiler feed water pipeline (5), the heat absorbing finned tube (6), the boiler finned tube (7) and the steam pipeline (8), wherein the heat absorbing finned tube (6) is located in the kiln tail flue gas transfer chamber (1), and the boiler finned tube (7) is located in the SP waste heat boiler (3). The demisting baffle (9) is arranged below the heat absorbing finned tube (6), and the sound wave soot blower (10) for dust removal is arranged on both sides of the demisting baffle (9). The kiln tail flue gas transfer chamber (1) and the kiln tail bag type dust collector (4) are communicated through the smoke exhaust pipeline (11), wherein the cold air valve (12) is arranged on the smoke exhaust pipeline (11). The dust collecting hopper (13) is arranged at the bottom of the kiln tail flue gas transfer chamber (1), and the rotary feeder (14) is arranged on the dust collecting hopper (13), and the kiln dust recovery tank (15) is arranged at the bottom of the rotary feeder (14).

2. A device for pre-treatment of exhaust gases from a cement kiln bag filter according to claim 1, characterized in that: The cleaning device (17) for cleaning the condensed water droplets on the surface of the heat absorbing finned tube (6) is further included, and the cleaning device (17) is driven by the external cleaning motor (16).

3. A device for pre-treatment of exhaust gases from a cement kiln bag filter according to claim 2, characterized in that: The annular water collecting groove (18) is arranged below the cleaning device (17), and the water collecting groove (18) is communicated with the kiln dust recovery tank (15) through the drain pipe (19).

4. A device for pre-treatment of exhaust gases from a cement kiln bag filter according to claim 3, characterized in that: The dryer (20) is arranged in the middle and lower part of the drain pipe (19), and the dryer (20) includes the filter screen (201) on the upper side and the lower side and the drying layer (202) in the middle part, and the detachable discharge port (203) is further arranged on the dryer (20).

5. A device for pre-treatment of exhaust gases of a bag filter of a cement kiln according to claim 1, characterized in that: The smoke pipeline maintenance door (21) is arranged on the kiln tail flue gas transfer chamber (1).

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