Medium-temperature low-dust electric-bag composite dust removal and denitration integrated equipment

Abstract

An intermediate-temperature low-dust electric-bag composite dust removal and denitration integrated device is characterized in that an ash hopper is mounted at the bottom of a machine body, an upper air inlet box is mounted at the front ends of the ash hopper and the machine body, an air inlet pipe is arranged at the top of the upper air inlet box, an electric field is arranged between the upper air inlet box and the machine body, and an ash removal vibrator and a high-voltage transformer are mounted at the top end of the electric field; a medium-temperature filter bag, a pulse dust cleaning device and an efficient denitration catalyst are sequentially arranged in an inner cavity of the machine body from bottom to top, an outlet horn is mounted at the top of the machine body, and an air outlet pipe is arranged on the outlet horn. The device has the beneficial effects that the device can not only solve the problems of high dust concentration and short service life of a catalyst in cement plant kiln tail flue gas treatment, but also realize the purposes of simultaneous treatment of dust and nitrate in cement plant kiln tail flue gas, small resistance, low energy consumption and low investment cost; and the equipment also has the advantages of low running resistance, simplicity and convenience in installation, long service life of the filter bag and low cost of the medium-temperature filter bag.

Description

Technical Field

[0001] The utility model relates to the technical field of cement plant kiln tail flue gas, in particular to medium-temperature low-dust electric bag composite dust removal and denitrification integrated equipment. Background Art

[0002] The cement kiln is one of the important equipment in the cement production process. It is used to calcine the raw materials under high temperature conditions to produce cement clinker. During the production process, the cement kiln will produce smoke containing a large amount of dust and saltpeter.

[0003] At present, the technical routes adopted in China for the treatment of dust and nitrate in the flue gas at the tail of cement plant kiln are mainly high-temperature high dust and high-temperature medium dust. However, the dust concentration in the flue gas is still very high in both routes, and the catalyst is easily blocked, worn, and poisoned, and the service life of the catalyst is short. Moreover, the flue gas temperature drops greatly after the high-temperature section is arranged and treated, which has a great impact on the power generation of the waste heat boiler at the back end. The volume of flue gas in the high-temperature section is larger than that in the medium-temperature section, and the corresponding treatment equipment is large in size and has a high investment, which is relatively inconvenient. Utility Model Content

[0004] The purpose of the utility model is to provide a medium-temperature, low-dust electric bag composite dust removal and denitrification integrated equipment in view of the shortcomings and defects in the prior art. The equipment can not only solve the problems of high dust concentration and short service life of the catalyst in the flue gas treatment at the tail of the cement plant kiln, but also achieve the purpose of simultaneous treatment of flue gas, dust and nitrate in the tail of the cement plant kiln, with low resistance, low energy consumption and low investment cost. The equipment also has the advantages of low operating resistance, easy installation, long service life of the filter bag and low cost of the medium-temperature filter bag.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a medium-temperature low-dust electric bag composite dust removal and denitrification integrated equipment, which includes a medium-temperature low-dust dust and denitrification integrated machine 6, the air inlet of the medium-temperature low-dust dust and denitrification integrated machine 6 is connected to a waste heat boiler 4, and the air outlet of the medium-temperature low-dust dust and denitrification integrated machine 6 is connected to a humidification tower 7, the medium-temperature low-dust dust and denitrification integrated machine 6 includes a machine body 67, the bottom of the machine body 67 is equipped with an ash hopper 66, and the ash hopper 66 is arranged at the front end of the machine body 67. An upper air inlet box 64 is provided, and an air inlet pipe 63 is provided on the top of the upper air inlet box 64. An electric field 65 is provided between the upper air inlet box 64 and the main body 67 of the machine body. A dust cleaning vibrator 61 and a high-voltage transformer 62 are installed on the top of the electric field 65. The inner cavity of the main body 67 is provided with a medium-temperature filter bag 68, a pulse dust cleaning device 69 and a high-efficiency denitrification catalyst 611 from bottom to top. An outlet horn 612 is installed on the top of the main body 67, and an air outlet pipe 613 is provided on the outlet horn 612.

[0006] Furthermore, a clean air chamber 610 is provided between the medium-temperature filter bag 68 and the high-efficiency denitration catalyst 611 .

[0007] Furthermore, the medium temperature filter bag 68 is made of any one of glass fiber, PTFE, P84 and PPS blend.

[0008] Furthermore, a first induced draft fan 5 for guiding the flue gas is provided between the waste heat boiler 4 and the medium-temperature low-dust and nitrate-removing integrated machine 6 .

[0009] Furthermore, a preheater 3 is connected to the air inlet of the waste heat boiler 4 , and the preheater 3 is communicated with the decomposition chamber 2 , and the decomposition chamber 2 is connected to the rotary kiln 1 .

[0010] Furthermore, one section of the humidifying tower 7 is connected to the kiln tail electric field 11, and the other section is connected to the raw material mill mechanism 8, and a cyclone dust collector 9 is provided on one side of the raw material mill mechanism 8, and the cyclone dust collector 9 is connected to the kiln tail electric field 11 through the second induced draft fan 10, and the outlet of the kiln tail electric field 11 is connected to the chimney 13 through the third induced draft fan 12.

[0011] Furthermore, a SNCR denitration device 301 is provided on one side of the preheater 3 .

[0012] After adopting the above technical scheme, the beneficial effects of the utility model are as follows: the equipment can not only solve the problems of high dust concentration and short service life of catalyst in the fume treatment of cement plant kiln tail, but also realize the simultaneous treatment of fume, dust and nitrate in the cement plant kiln tail, with low resistance, low energy consumption and low investment cost, and the equipment also has the advantages of low operating resistance, easy installation, long service life of filter bags and low cost of medium-temperature filter bags. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0014] Figure 1 It is a schematic diagram of the process of the utility model.

[0015] Figure 2 It is a structural schematic diagram of the medium-temperature low-dust and dust-nitrate integrated machine 6 of the utility model.

[0016] Explanation of the reference numerals: rotary kiln 1, decomposition chamber 2, preheater 3, waste heat boiler 4, first induced draft fan 5, medium-temperature low-dust and dust-nitrate integrated machine 6, humidifying tower 7, raw material grinding mechanism 8, cyclone dust collector 9, second induced draft fan 10, kiln tail electric field 11, third induced draft fan 12, chimney 13, ash cleaning vibrator 61, high-voltage transformer 62, air inlet pipe 63, upper air inlet box 64, electric field 65, ash hopper 66, machine body 67, medium-temperature filter bag 68, pulse ash cleaning device 69, clean air chamber 610, high-efficiency denitration catalyst 611, outlet horn 612, air outlet pipe 613, SNCR denitration device 301. DETAILED DESCRIPTION

[0017] See also Figure 1-Figure 2 As shown, the technical solution adopted in this specific embodiment is: it includes a medium-temperature low-dust dust and nitrate integrated machine 6, the air inlet of the medium-temperature low-dust dust and nitrate integrated machine 6 is connected to the waste heat boiler 4, the air outlet of the medium-temperature low-dust dust and nitrate integrated machine 6 is connected to the humidification tower 7, the medium-temperature low-dust dust and nitrate integrated machine 6 includes a machine body 67, a ash hopper 66 is installed at the bottom of the machine body 67, and an upper air inlet box 64 is installed at the front end of the ash hopper 66 and the machine body 67, and an air inlet pipe 63 is provided on the top of the upper air inlet box 64, and the upper air inlet box 64 and the machine body 6 7, an electric field 65 is provided, a cleaning vibrator 61 and a high-voltage transformer 62 are installed at the top of the electric field 65, and a medium-temperature filter bag 68, a pulse cleaning device 69 and a high-efficiency denitration catalyst 611 are provided in the inner cavity of the main body 67 from bottom to top. In this embodiment, an electric field and a medium-temperature filter bag are used to form an electric bag composite dust removal structure. The electric field first captures most of the dust in the flue gas in the electric dust removal area through positive and negative electrode discharge, so that the dust treated by the bag filter area is small, the resistance is low, the cleaning cycle is long, and the wear of coarse particles of smoke is avoided. After the dust is charged in the electric dust removal area, the dust layer structure deposited on the surface of the filter bag is improved. Charges of the same polarity repel each other, and particles are arranged in a regular and orderly manner. The formed dust layer has high porosity, good air permeability, is easy to peel off, and has low resistance. The actual operating resistance is lower than that of a pure bag dust collector, the cleaning cycle is long, the compressed air consumption is small, the operating resistance is low, and the cleaning air source consumption is small, which greatly reduces the operating power of the electric bag dust collector and extends the service life of the filter bag. An outlet horn 612 is installed on the top of the body 67, and an air outlet pipe 613 is provided on the outlet horn 612.

[0018] More specifically, a clean air chamber 610 is provided between the medium temperature filter bag 68 and the high efficiency denitration catalyst 611. The clean air chamber 610 can effectively buffer and evenly distribute the gas after dust removal, so that the high efficiency denitration catalyst 611 can play a better catalytic role.

[0019] More specifically, the medium temperature filter bag 68 is made of any one of glass fiber, PTFE, P84 and PPS blend, which has lower manufacturing cost and is more convenient to store, transport and install.

[0020] To explain more specifically, a first induced draft fan 5 for guiding the flue gas is provided between the waste heat boiler 4 and the medium-temperature low-dust and nitrate-removing integrated machine 6 .

[0021] More specifically, the air inlet of the waste heat boiler 4 is connected to a preheater 3, and the preheater 3 is connected to the decomposition chamber 2, and the decomposition chamber 2 is connected to the rotary kiln 1. After the production of the rotary kiln 1 is completed, the flue gas will enter the decomposition chamber 2 for preliminary decomposition, and then be preheated by the preheater 3 to ensure that the temperature of the flue gas is relatively constant. After entering the waste heat boiler 4, it will enter the medium-temperature low-dust dust and saltpeter integrated machine 6 for filtration.

[0022] More specifically, one section of the humidification tower 7 is connected to the kiln tail electric field 11, and the other section is connected to the raw material mill mechanism 8, and a cyclone dust collector 9 is provided on one side of the raw material mill mechanism 8, and the cyclone dust collector 9 is connected to the kiln tail electric field 11 through the second induced draft fan 10, and the outlet of the kiln tail electric field 11 is connected to the chimney 13 through the third induced draft fan 12. After the flue gas is processed by the medium-temperature low-dust dust and saltpeter integrated machine 6, it enters the humidification tower 7, and the dusty flue gas is filtered through the raw material mill mechanism 8 and the cyclone dust collector 9 and enters the kiln tail electric field 11, and the filtered gas is discharged from the chimney 13 through the third induced draft fan 12.

[0023] To be more specific, a SNCR denitration device 301 is provided on one side of the preheater 3 .

[0024] The working principle of the utility model is as follows: after the flue gas is introduced into the air inlet pipe 63 from the waste heat boiler 4 through the first induced draft fan 5, the flue gas will enter the upper air inlet box 64 from the air inlet pipe 63, and be dusted through the electric field 65, and then enter the medium-temperature filter bag 68. The pulse cleaning device 69 is a filter bag with a continuous use temperature lower than 240°C. The dust-removed and purified flue gas enters the high-efficiency denitrification catalyst 611. After the high-efficiency denitrification catalyst 611 completes the denitrification operation, it is discharged into the humidification tower 7 through the air outlet pipe 613. Among them, when the amount of dust on the electric field 65 is large, it can be vibrated by the cleaning vibrator 61, and then collected by the ash hopper 66, and the medium-temperature filter bag 68 is cleaned by the pulse cleaning device 69.

[0025] The above is only used to illustrate the technical solution of the utility model rather than to limit it. Other modifications or equivalent substitutions made to the technical solution of the utility model by ordinary technicians in this field should be included in the scope of the claims of the utility model as long as they do not depart from the spirit and scope of the technical solution of the utility model.

Claims

1. A medium-temperature low-dust electric bag composite dust removal and denitrification integrated equipment, characterized by: It includes a medium-temperature low-dust and dust-removing integrated machine (6), the medium-temperature low-dust and dust-removing integrated machine (6) includes a machine body (67), a dust hopper (66) is installed at the bottom of the machine body (67), an upper air inlet box (64) is installed at the front end of the ash hopper (66) and the machine body (67), an electric field (65) is provided between the upper air inlet box (64) and the machine body (67), and the inner cavity of the machine body (67) is provided with a medium-temperature filter bag (68), a pulse cleaning device (69) and a high-efficiency denitrification catalyst (611) from bottom to top.

2. According to claim 1, a medium-temperature low-dust electric bag composite dust removal and denitrification integrated equipment is characterized by: The air inlet of the medium-temperature low-dust and dust-nitrate integrated machine (6) is connected to a waste heat boiler (4), and the air outlet of the medium-temperature low-dust and dust-nitrate integrated machine (6) is connected to a humidification tower (7).

3. According to claim 1, a medium-temperature low-dust electric bag composite dust removal and denitrification integrated equipment is characterized by: A dust cleaning rapper (61) and a high-voltage transformer (62) are installed at the top of the electric field (65), and an air inlet pipe (63) is provided at the top of the upper air inlet box (64).

4. According to claim 1, a medium-temperature low-dust electric bag composite dust removal and denitrification integrated equipment is characterized in that: An outlet horn (612) is installed on the top of the machine body (67), and an air outlet pipe (613) is provided on the outlet horn (612).

5. According to claim 1, a medium-temperature low-dust electric bag composite dust removal and denitrification integrated equipment is characterized by: A clean air chamber (610) is provided between the medium-temperature filter bag (68) and the high-efficiency denitration catalyst (611).

6. According to claim 1, a medium-temperature low-dust electric bag composite dust removal and denitrification integrated equipment is characterized by: The medium temperature filter bag (68) is made of any one of glass fiber, PTFE, P84 and PPS blend.

7. According to claim 2, a medium-temperature low-dust electric bag composite dust removal and denitrification integrated equipment is characterized by: A first induced draft fan (5) for guiding flue gas is provided between the waste heat boiler (4) and the medium-temperature low-dust and dust-nitrogen integrated machine (6).

8. According to claim 2, a medium-temperature low-dust electric bag composite dust removal and denitrification integrated equipment is characterized by: The air inlet of the waste heat boiler (4) is connected to a preheater (3), and the preheater (3) is connected to the decomposition chamber (2), and the decomposition chamber (2) is connected to its rotary kiln (1).

9. The medium-temperature low-dust electric bag composite dust removal and denitrification integrated equipment according to claim 2 is characterized by: One section of the humidifying tower (7) is connected to the kiln tail electric field (11), and the other section is connected to the raw material grinding mechanism (8). A cyclone dust collector (9) is provided on one side of the raw material grinding mechanism (8). The cyclone dust collector (9) is connected to the kiln tail electric field (11) through a second induced draft fan (10). The outlet of the kiln tail electric field (11) is connected to a chimney (13) through a third induced draft fan (12).

10. The medium-temperature low-dust electric bag composite dust removal and denitrification integrated equipment according to claim 8 is characterized by: A SNCR denitration device (301) is provided on one side of the preheater (3).

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