CN221155816U - Dust removing system for lime working section - Google Patents

Abstract

The utility model belongs to the technical field of environmental treatment, and relates to a dust removal system of a lime working section, which comprises a lime treatment unit, a lime tail gas dust collection pipe communicated with the lime treatment unit, a tail gas dust remover, a tail gas fan and a chimney which are sequentially communicated; the tail gas dust remover is also communicated with a lime tail gas dust collection pipe; the tail gas dust remover is respectively provided with a first material level gauge and a second material level gauge; the first level gauge is located above the second level gauge. The utility model provides a dust removing system for a lime working section, which has the advantages of no air leakage and no generation of ash and dust emission, greatly reduces the wear rate of a blower bellows, and ensures the stable operation of the site environment and the dust removing system.

Description

Dust removal system in lime workshop

Technical Field

The utility model belongs to the technical field of environmental management and relates to a lime work section dust removal system.

Background technique

Lime production is one of the necessary processes for calcium carbide chemical companies. Specifically, in the lime kiln, limestone and other materials are heated to a high temperature to decompose them into calcium oxide and carbon dioxide. The finished calcium oxide is then unloaded from the lime kiln and transported out by belts. In existing production, the lime section will generate a lot of dust, such as lime tail gas, as well as scattered ash in the transportation and finished product areas. These dusts pollute the environment. The existing dust treatment has the following problems:

(1) Since tail gas dust removal in the lime process is a crucial link and plays a decisive role in the stable production of the lime kiln, the existing dust removal device is to blow the dust from the lime processing unit into the dust collector through a fan, and then discharge it after dust removal. However, the existing dust removal box has air leakage and dust leakage, which not only affects the production site environment, but also has a high wear rate of the fan bellows and a high frequency of fan maintenance. The fan bellows must be replaced once a year or so, which affects the stable operation of the dust removal system;

(2) When the finished lime products are transported, there is a lot of dust on site, so a dust removal system is used to collect dust. However, since there are many dust collection points in the dust removal system and the suction power of the dispersed dust collection ports is small, dust can be seen everywhere on the floor of the finished product corridor, which requires a large amount of manpower for sanitation cleaning, greatly increasing the labor intensity of the workers;

(3) The current dust removal device not only receives dust from the lime kiln exhaust, but also receives dust from the dust suction duct at the top feed port of the lime kiln, the dust suction duct at the bottom trolley discharge port of the lime kiln, the dust suction duct of each finished product conveyor belt conveyor, and the 5.4-meter-high finished product cooling air outlet duct of the lime kiln. However, this will increase the flue gas flow and oxygen content in the lime kiln exhaust, resulting in the exhaust gas monitoring value in the online monitoring system being converted to an excessive value, which does not meet environmental protection requirements. In order to reduce the online monitoring of flue gas flow and oxygen content, the opening of 19 conveyor belts is reduced to less than 30%, or blind plates are added, resulting in poor dust removal effect at scattered points in the belt corridor, dust overflow, and harm to the occupational health of employees on the job, increasing the labor intensity of employees on the job.

Utility Model Content

In order to solve the technical problems of air leakage and ash leakage in existing positive pressure dust removal devices and high frequency of fan maintenance with safety risks, the utility model provides a lime section dust removal system, which has no air leakage and no ash and dust emission, greatly reduces the wear rate of the fan bellows, and ensures the stable operation of the on-site environment and the dust removal system.

In order to achieve the above purpose, the technical solution adopted by the utility model is:

A lime dust removal system comprises a lime processing unit and a lime tail gas dust suction pipe connected to the lime processing unit, and also comprises a tail gas dust collector, a tail gas fan and a chimney connected in sequence; the tail gas dust collector is also connected to the lime tail gas dust suction pipe.

It is further defined that a first material level meter and a second material level meter are respectively provided on the exhaust gas dust collector; the first material level meter is located above the second material level meter.

It is further defined that the lime dust removal system also includes a control valve disposed on the lime tail gas dust suction pipe.

It is further defined that the lime section dust removal system also includes a scattered-point dust suction pipe, a scattered-point dust collector and a scattered-point fan which are connected in sequence; the scattered-point dust suction pipe is connected to the lime processing unit, and the scattered-point fan is connected to the chimney.

It is further defined that a third material level meter and a fourth material level meter are respectively provided on the scattered-point dust collector; the third material level meter is located above the fourth material level meter.

It is further defined that the scattered-point dust suction pipes include a white ash feeding dust suction pipe, a white ash discharging dust suction pipe, a white ash conveying dust suction pipe and a white ash finished product cooling outlet pipe, which are respectively connected to the white ash processing unit.

It is further defined that control valves are provided on the lime feed dust suction pipe, the lime discharge dust suction pipe, the lime conveying dust suction pipe and the lime finished product cooling outlet pipe.

It is further defined that the lime section dust removal system also includes a tail gas compressed air pipe, one end of the tail gas compressed air pipe is placed outside the tail gas dust collector, and the other end of the tail gas compressed air pipe extends into the tail gas dust collector.

It is further defined that the lime section dust removal system also includes a scattered-point compressed air pipe, one end of the scattered-point compressed air pipe is placed outside the scattered-point dust collector, and the other end of the scattered-point compressed air pipe extends into the interior of the tail gas dust collector.

It is further defined that the lime section dust removal system also includes a compressed air tank connected to the exhaust gas compressed air pipe and the scattered point compressed air pipe respectively; flow meters are provided on the exhaust gas compressed air pipe and the scattered point compressed air pipe.

The beneficial effects of the utility model are:

1. In the utility model, the exhaust dust collector, the exhaust fan and the chimney are connected to the white ash exhaust dust suction pipe in sequence, and the exhaust fan is used to draw negative pressure to suck the white ash exhaust dust suction pipe into the exhaust dust collector, and then blown into the chimney for discharge after dust removal. The negative pressure method is used to ensure the dust removal effect, so that the particle concentration in the white ash exhaust gas is reduced from about 200mg/ ^m3 to 10mg/ ^m3 , and the dust removal system has no air leakage and no dust emission, which greatly reduces the workload of the post personnel; in addition, it also greatly reduces the wear rate of the exhaust fan, reduces the maintenance frequency of the exhaust fan, and maintains that it does not need to be replaced within three years.

2. In the utility model, each scattered ash and white ash tail gas is treated separately and operated independently, avoiding the increase of online monitoring of flue gas flow and oxygen content, ensuring the accuracy of environmental protection data to solve the emission standards, improving the production environment, and achieving tail gas emission standards while reducing the labor intensity of job personnel.

3. In the present invention, by installing a high material level meter and a low material level meter, the material level of the dust collector can be remotely obtained, and the dust removal and ash discharge of the dust collector can be automatically realized according to the material level, thereby improving the automation level.

4. In the utility model, the compressed air generated by the calcium carbide section is introduced into the tail gas dust collector and the scattered point dust collector through the pipeline, and the dust collector is sprayed. The pressure meets the spraying requirements, so that the accumulated dust can be blown out well, ensuring the normal and stable operation of the dust collector.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic diagram of a first embodiment of the dust removal system of the utility model;

FIG2 is a schematic diagram of a second embodiment of the dust removal system of the present utility model;

in:

1—lime treatment unit; 2—exhaust dust collector; 3—exhaust fan; 4—chimney; 5—lime exhaust dust suction pipe; 6—control valve; 7—exhaust compressed air pipe; 8—scattered dust collector; 9—scattered fan; 10—scattered dust suction pipe; 101—lime feeding dust suction pipe; 102—lime discharging dust suction pipe; 103—lime conveying dust suction pipe; 104—lime finished product cooling outlet pipe; 11—scattered compressed air pipe.

Detailed ways

The present invention is now described in detail with reference to the accompanying drawings and embodiments.

Example 1

Referring to Figure 1, a lime dust removal system includes a lime processing unit 1 and a lime tail gas dust suction pipe 5 connected to the lime processing unit 1, and also includes a tail gas dust collector 2, a tail gas fan 3 and a chimney 4 connected in sequence; the tail gas dust collector 2 is also connected to the lime tail gas dust suction pipe 5.

The white ash section dust removal system also includes a control valve 6 arranged on the white ash tail gas dust suction pipe 5, and the flow rate of the white ash tail gas entering the tail gas dust collector 2 is controlled by the control valve 6 and the tail gas fan 3.

Specifically, the lime kiln tail gas in the lime processing unit 1 enters the tail gas dust collector 2 through the lime tail gas dust suction pipe 5, and the flue gas after dust removal enters the chimney 4 through the tail gas fan 3 for discharge.

The tail gas fan 3 is arranged after the tail gas dust collector 2, and the negative pressure dust is removed by the tail gas fan 3. The frequency of the tail gas fan 3 is 36Hz. When the negative pressure of the lime kiln body of the lime processing unit is -1kpa, the particle concentration in the lime tail gas of the lime kiln in the lime processing unit 1 is reduced from about 200mg/ ^m3 to 10mg/ ^m3 . After the dust removal treatment, the tail gas dust collector 2 has no air leakage and no ash and dust emission, which greatly reduces the workload of the post personnel; in addition, it also greatly reduces the wear rate of the tail gas fan 3, reduces the maintenance frequency of the tail gas fan 3, and does not need to be replaced within three years.

During implementation, the tail gas dust collector 2 is a bag dust collector. The dust filtered out after dust removal is collected by a scraper under the tail gas dust collector 2 and then collected into an ash conveying belt to be sent out of the system.

In this embodiment, the control signals involved in the exhaust dust collector 2 and the control valve 6 are connected to the DCS central control system, and the white ash exhaust dust removal control is realized through the central control; it can also overcome the problem that when encountering abnormal conditions, the exhaust fan 3 in the existing positive pressure dust removal cannot be started and stopped in time due to the operation of the frequency conversion control cabinet. This embodiment can stop the exhaust fan 3 in time, which is safe and reliable.

Furthermore, a first material level meter and a second material level meter are respectively arranged on the tail gas dust collector 2; the first material level meter is located above the second material level meter.

The first material level meter is a high material level meter, which is used to monitor the highest material level line in the dust removal bin of the exhaust dust collector 2, and the second material level meter is a low material level meter, which is used to monitor the lowest material level line in the dust removal bin of the exhaust dust collector 2. The height of the material level is designed according to the size of the exhaust dust collector 2.

Since the dust removal silo of the existing dust removal device has no material level metering, the material level can only be checked by knocking on site, and the dust removal and ash discharge are manually operated on site, which is inefficient and inconvenient to operate. In this embodiment, during implementation, the first material level meter and the second material level meter are connected to the DCS control system. By installing the first material level meter and the second material level meter, the material level can be obtained remotely, and the dust removal and ash discharge of the exhaust gas dust collector 2 can be automatically discharged according to the material level, thereby improving the level of automation.

Example 2

2 , the lime dust removal system provided in this embodiment also includes a scattered-point dust suction pipe 10 , a scattered-point dust collector 8 and a scattered-point fan 9 connected in sequence; the scattered-point dust suction pipe 10 is connected to the lime processing unit 1 , and the scattered-point fan 9 is connected to the chimney 4 .

The scattered dust suction pipe 10 comprises a lime feeding dust suction pipe 101 , a lime discharging dust suction pipe 102 , a lime conveying dust suction pipe 103 and a lime finished product cooling outlet pipe 104 , which are respectively connected to the lime processing unit 1 .

Control valves 6 are provided on the lime feed dust suction pipe 101, the lime discharge dust suction pipe 102, the lime conveying dust suction pipe 103 and the lime finished product cooling outlet pipe 104; the control valves 6 are used to control the opening of the dust suction pipeline and the flow rate of dust flowing through.

In the present embodiment, the dust suction pipe at the top feed port of the lime kiln (i.e., the lime feed dust suction pipe 101), the dust suction pipe at the discharge port of the trolley at the bottom of the lime kiln (i.e., the lime discharge dust suction pipe 102), the dust suction pipes of the finished product conveyor belt conveyor (lime conveying dust suction pipe 103), and the finished product cooling air outlet pipe at the 5.4-meter layer of the lime kiln (i.e., the lime finished product cooling outlet pipe 104) in the lime processing unit 1, are all connected to the scattered ash pipes 8 for separate discharge, so as to operate independently from the original lime exhaust dust removal system, avoid the increase in online monitoring of flue gas flow and oxygen content, ensure the accuracy of environmental protection data to solve the emission standards, improve the production operation environment, and make the lime dust from unorganized dispersion to organized treatment, which can not only make the exhaust gas meet the emission standards, but also reduce the labor intensity of job personnel. Furthermore, the scattered ash dust removal also adopts negative pressure dust removal, which has a good dust removal effect. The scattered dust collector 8 has no air leakage and no ash and dust emission, which greatly reduces the workload of the post personnel. In addition, it also greatly reduces the wear rate of the scattered point fan 9, reduces the maintenance frequency, and does not need to be replaced for three years of use.

During implementation, the scattered-point dust collector 8 is a bag dust collector. The dust filtered out after dust removal is collected by a scraper below the scattered-point dust collector 8 and then collected into an ash conveying belt to be sent out of the system.

In this embodiment, the control signals involved in the scattered-point dust collector 8 and the control valves 6 on each scattered-point dust suction pipe are connected to the DCS central control system, and the dust removal control of the white ash tail gas is realized through the central control; it can also overcome the problem that when encountering abnormal situations, the scattered-point fan 9 in the existing positive pressure dust removal cannot be started and stopped in time due to the operation of the frequency conversion control cabinet, so that the scattered-point fan 9 can be stopped in time to reduce the wear of the machine.

Furthermore, a third material level meter and a fourth material level meter are respectively arranged on the scattered-point dust collector; the third material level meter is located above the fourth material level meter.

The third material level meter is a high material level meter, which is used to monitor the highest material level line in the dust removal bin of the scattered-point dust collector 8, and the fourth material level meter is a low material level meter, which is used to monitor the lowest material level line in the dust removal bin of the scattered-point dust collector 8. The height of the material level is designed according to the size of the scattered-point dust collector 8. During implementation, the third material level meter and the fourth material level meter are connected to the DCS control system, and the height of the material level can be obtained remotely. The dust removal and ash discharge of the scattered-point dust collector 8 can be automatically discharged according to the material level, thereby improving the automation level.

Example 3

On the basis of Example 1, the lime section dust removal system further includes a tail gas compressed air pipe 7, one end of the tail gas compressed air pipe 7 is placed outside the tail gas dust collector 2, and the other end of the tail gas compressed air pipe 7 extends into the tail gas dust collector 2.

The lime section dust removal system also includes a compressed air tank connected to the tail gas compressed air pipe 7. The tail gas compressed air pipe 7 is provided with a flow meter.

Specifically, the compressed air comes from the calcium carbide section, is first introduced into the compressed air tank through a DN125*350m pipeline, and then is supplied to the tail gas dust collector 2 for spraying through the tail gas compressed air pipe 7, so as to blow out the dust accumulated in the tail gas dust collector 2. The compressed air delivery pipeline has a delivery pressure of 0.8Mpa, which meets the spraying requirements and ensures the normal and stable operation of the dust collector.

Example 4

The lime dust removal system also includes a scattered-point compressed air pipe 11 , one end of which is placed outside the scattered-point dust collector 8 , and the other end of the scattered-point compressed air pipe 11 extends into the interior of the scattered-point dust collector 8 of the tail gas dust collector 2 .

The lime dust removal system also includes a compressed air tank connected to the scattered compressed air pipe 11. The scattered compressed air pipe 11 is provided with a flow meter.

During implementation, the compressed air comes from the calcium carbide section and is first led into the compressed air tank through a DN125*350m pipeline, and then is supplied to the scattered-point dust collector 8 for spraying through the scattered-point compressed air pipe 11 to blow out the dust accumulated in the scattered-point dust collector 8; the compressed air delivery pipeline has a delivery pressure of 0.8Mpa, which meets the spraying requirements and ensures the normal and stable operation of the dust collector.

Claims (10)

1. The lime section dust removing system comprises a lime treatment unit (1) and a lime tail gas dust suction pipe (5) communicated with the lime treatment unit (1), and is characterized by further comprising a tail gas dust remover (2), a tail gas fan (3) and a chimney (4) which are sequentially communicated; the tail gas dust remover (2) is also communicated with a lime tail gas dust collection pipe (5).

2. The lime section dedusting system according to claim 1, wherein a first level gauge and a second level gauge are respectively arranged on the tail gas deduster (2); the first level gauge is located above the second level gauge.

3. A lime section dust removal system as claimed in claim 2, characterized in that the lime section dust removal system further comprises a control valve (6) arranged on the lime tail gas suction pipe (5).

4. A lime process dust removal system as claimed in any one of claims 1-3, further comprising a point dust collection pipe (10), a point dust remover (8) and a point fan (9) in sequential communication; the scattered point dust collection pipe (10) is communicated with the lime treatment unit (1), and the scattered point fan (9) is communicated with the chimney (4).

5. The lime section dedusting system as claimed in claim 4, wherein a third level gauge and a fourth level gauge are respectively arranged on the scattered point deduster (8); the third level gauge is located above the fourth level gauge.

6. A lime process dust removal system as claimed in claim 4, wherein the scatter dust collection pipe (10) comprises a lime feed dust collection pipe (101), a lime discharge dust collection pipe (102), a lime transfer dust collection pipe (103) and a lime product cooling outlet pipe (104) in communication with the lime treatment unit (1), respectively.

7. A lime process dust removal system as claimed in claim 6, wherein control valves (6) are provided on the lime feed dust suction pipe (101), on the lime discharge dust suction pipe (102), on the lime delivery dust suction pipe (103) and on the lime product cooling outlet pipe (104).

8. The lime section dust removal system of claim 6, further comprising a tail gas compressed air pipe (7), wherein one end of the tail gas compressed air pipe (7) is arranged outside the tail gas dust remover (2), and the other end of the tail gas compressed air pipe (7) extends into the tail gas dust remover (2).

9. A lime process dust removal system as claimed in claim 7, further comprising a scattered point compressed air pipe (11), wherein one end of the scattered point compressed air pipe (11) is arranged outside the scattered point dust remover (8), and the other end of the scattered point compressed air pipe (11) extends into the scattered point dust remover (8) of the tail gas dust remover (2).

10. A lime process dust removal system as claimed in claim 7, further comprising a compressed air tank in communication with the tail gas compressed air pipe (7) and the bulk compressed air pipe (11), respectively; and the tail gas compressed air pipe (7) and the scattered compressed air pipe (11) are provided with flow meters.