CN219991641U - Blast furnace coal injection and pulverizing system with coal powder bin negative pressure device - Google Patents

Abstract

The utility model is a blast furnace injection coal pulverizing system equipped with a negative pressure device for a pulverized coal bunker, which includes a mill, a bag pulverizer, a pulverized coal bunker, a main exhaust fan and a control unit. The pulverized coal bunker is connected with a moisture-absorbing pipe. , the outlet of the moisture suction pipe is connected to the entrance of the bag powder collector through the first branch or the second branch, and a negative pressure device is set on the second branch. The negative pressure device includes an ejector, and the ejector is connected to the ejector gas tank. , an ejector nozzle is installed in the ejector, and the ejector airflow supplied by the ejector gas tank is ejected from the ejector nozzle to form a negative pressure area; mill, bag dust collector, pulverized coal bin, main exhaust fan, first branch , the second branch, and the negative pressure device are all electrically connected to the control unit. The utility model solves the problem that when the pulverizing system is overhauled and stopped working, the pulverized coal bin cannot maintain negative pressure, causing water vapor, CO and other combustible gases in the bin to be unable to be discharged in time; the pulverized coal bin is always in a negative pressure state and does not need to consume the outside world. of mechanical energy or electrical energy, saving energy consumption and solving the problem of equipment occupying space.

Description

Blast furnace coal injection pulverizing system equipped with negative pressure device for pulverized coal bin

Technical field

The utility model relates to the technical field of blast furnace pulverizing systems, and in particular to a blast furnace coal injection pulverizing system equipped with a negative pressure device for a pulverized coal bin.

Background technique

At present, the blast furnace pulverizing system mostly adopts the first-level bag powder collection process, that is, the pulverized coal ground by the coal mill is dried by dry gas, and enters the bag powder collector with the air flow. The pulverized coal is collected in the ash hopper, and then passed through the pulverized coal The sieve enters the pulverized coal bin for storage. The gas filtered by the bag dust collector is discharged into the atmosphere through the main exhaust fan. When the coal injection pulverizing system works normally, it is required to maintain a negative pressure in the pulverized coal bin. On the one hand, it is to discharge the water vapor in the bin and the combustible gas decomposed by the thermal decomposition of the pulverized coal; on the other hand, it can prevent the pulverized coal from overflowing, which is beneficial to environmental protection and meets the requirements of explosion prevention. Require.

The existing technology mostly uses a moisture-absorbing pipe to connect to the bag powder collector, and uses the main exhaust fan or a proprietary fan to generate negative pressure. The top of the pulverized coal bin is connected to the entrance of the bag powder collector through a pipe (moisture-absorbing pipe). In the powder making system During operation, the gas in the pulverized coal bin is discharged through the pipe (moisture absorbing pipe), and the pulverized coal bin can maintain a slightly negative pressure state. In this technology, when the main exhaust fan is not working, the inside of the bag powder collector is in a normal pressure state. The "chimney effect" of the moisture absorption pipe alone cannot discharge all the gas. The inside of the warehouse will become a positive pressure state, and the CO generated by the pulverized coal will The content of other combustible gases may also exceed the standard, which is not conducive to system safety. Therefore, when using the moisture-absorbing pipe solution, the main exhaust fan needs to be designed as a variable frequency fan. When the milling system is suspended or the mill and other equipment are inspected, the main exhaust fan will reduce the working frequency and reduce the air volume, so that the entire milling system Continuously maintain negative pressure, but this consumes a lot of power and does not take into account the maintenance time of the main exhaust fan. And specially setting up a small-displacement dispersion fan will increase investment.

Or set up a bag dust collector with a small fan on the top of the pulverized coal silo to generate negative pressure. The gas in the warehouse enters the cloth bag on the top of the warehouse, and after dust removal, is discharged to the atmosphere with the fan. Installing bags on the warehouse roof requires a large space to be reserved, which affects the overall height and equipment layout of the workshop. The use of cloth bags on the warehouse roof and small fans will increase investment, equipment operation energy consumption and subsequent maintenance costs.

Both measures have limitations. When the pulverizing system is not working when the moisture-absorbing pipe is used, the pulverized coal bin cannot create a negative pressure environment. Setting up a dust collector on the top of the bin is too complicated and increases investment. New technology is urgently needed to solve the problem. the above issues.

Therefore, relying on many years of experience and practice in related industries, the inventor proposes a blast furnace coal injection pulverizing system equipped with a negative pressure device for a pulverized coal bunker to overcome the shortcomings of the existing technology.

Utility model content

The purpose of this utility model is to provide a blast furnace coal injection pulverizing system equipped with a negative pressure device for a pulverized coal bunker, so as to solve the problem that the pulverized coal bunker cannot maintain negative pressure and cause water vapor and CO in the bunker when the pulverizing system is overhauled and stopped working. Such as the problem that combustible gas cannot be discharged in time; the pulverized coal bunker of this utility model is always in a negative pressure state, and the ejector is the core structure of the negative pressure device and does not require any transmission components; it does not need to consume external mechanical energy or electrical energy, saving Energy consumption is reduced and the problem of equipment occupying space is solved.

The purpose of this utility model is achieved by providing a blast furnace coal injection pulverizing system equipped with a negative pressure device for a pulverized coal bin, including a mill, a bag pulverizer, a pulverized coal bin, a main exhaust fan and a control unit. A moisture-absorbing pipe is connected to the top of the pulverized coal bin. The outlet of the moisture-absorbing pipe is connected to the entrance of the bag powder collector through a first branch or a second branch arranged in parallel. A negative pressure is set on the second branch. device, the negative pressure device includes an ejector, the ejector is connected to an ejector gas tank, an ejector nozzle is provided in the ejector, and the ejector airflow supplied by the ejector gas tank is from the ejector gas tank. The jet nozzle sprays out to form a negative pressure area; the mill, the bag dust collector, the pulverized coal bin, the main exhaust fan, the first branch, the second branch, the negative The pressure devices are all electrically connected to the control part.

In a preferred embodiment of the present invention, the ejector is connected to the ejector gas tank through an ejector gas pipeline, and a flow regulating valve, a flow meter and a fifth shut-off valve are provided on the ejector gas pipeline. The flow regulating valve, the flow meter and the fifth shut-off valve are all electrically connected to the control part.

In a preferred embodiment of the present invention, a pressure transmitter is connected to the top of the pulverized coal bunker; a first cut-off valve and a second cut-off valve are set on the first branch, and the second branch is located on A third cut-off valve and a fourth cut-off valve are respectively provided at both ends of the ejector; the pressure transmitter, the first cut-off valve, the second cut-off valve, the third cut-off valve and the The fourth shut-off valves are all electrically connected to the control unit.

In a preferred embodiment of the present invention, the moisture-absorbing pipe is provided with a wear-resistant metal hose.

In a preferred embodiment of the present invention, the inner cavity of the ejector is lined with a wear-resistant ceramic layer.

In a preferred embodiment of the present invention, the injection nozzle is made of wear-resistant metal or ceramic material.

In a preferred embodiment of the present invention, the injection gas tank is a nitrogen tank.

In a preferred embodiment of the present invention, the mill is connected to the bag powder collector through an inlet pipe of the bag powder collector, and the outlets of the first branch and the second branch are connected to the bag powder collector. Bag dust collector inlet pipe.

In a preferred embodiment of the present invention, a pulverized coal screen is provided between the bag pulverizer and the pulverized coal bunker.

In a preferred embodiment of the present invention, the bag powder collector is connected to the main exhaust fan through the bag outlet pipe, and the outlet of the main exhaust fan is connected to the dispersion pipe.

From the above, the blast furnace coal injection pulverizing system equipped with a pulverized coal bunker negative pressure device of the present invention has the following features:

Beneficial effects:

When the blast furnace coal injection pulverizing system equipped with a negative pressure device for a pulverized coal bunker of the present invention is operating normally, the gas in the pulverized coal bunker is extracted and discharged through the main exhaust fan, and the pulverized coal bunker can maintain a negative pressure state of about -1KPa; When the pulverizing system is inspected and stopped working, the negative pressure device starts working to put the pulverized coal bunker in a negative pressure state; the pulverized coal bunker of the utility model is always in a negative pressure state, reducing the content of combustible gases such as _O2 and CO, and improving the system It is safe; and it can effectively discharge water vapor in the warehouse, thereby reducing the moisture content of pulverized coal, improving the fluidity of pulverized coal, and avoiding clogging of powder conveying pipelines or spray guns due to high moisture content, thereby affecting blast furnace production;

The ejector is the core structure of the negative pressure device. It has a simple structure and is durable. It can work only by relying on the pressure, temperature and other parameters of the fluid. It does not require any transmission components; it does not need to consume external mechanical energy or electrical energy, saving energy consumption. Reduce project investment;

The utility model effectively solves the problem that the pulverized coal bunker cannot maintain negative pressure when the pulverizing system is inspected and stopped, causing water vapor, CO and other combustible gases in the pulverized coal bunker to be unable to be discharged in time; the entire device is simpler and does not require additional bags or The fan saves money and solves the problem of equipment occupying space.

Description of the drawings

The following drawings are only intended to schematically illustrate and explain the present invention, and do not limit the scope of the present invention. in:

Figure 1 is a schematic diagram of a blast furnace coal injection pulverizing system equipped with a negative pressure device for a pulverized coal bunker according to the present invention.

In the picture:

1. Mill; 2. Bag collector inlet pipe; 3. Fourth shut-off valve; 4. Injector; 5. Flow regulating valve; 6. Flow meter; 7. Fifth shut-off valve; 8. Injection gas Pipeline; 9. Injection gas tank; 10. Second shut-off valve; 11. First branch; 12. First shut-off valve; 13. Second branch; 14. Third shut-off valve; 15. Moisture suction pipe; 16. Wear-resistant metal hose; 17. Pulverized coal bin; 18. Bag powder collector; 19. Pressure transmitter; 20. Powdered coal screen; 21. Bag outlet pipe; 22. Dispersion pipe; 23. Main exhaust fan .

Detailed ways

In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific embodiments of the present invention will now be described with reference to the accompanying drawings.

The specific embodiments of the present invention described here are only for the purpose of explaining the present invention and cannot be understood as limiting the present invention in any way. Under the teachings of the present utility model, skilled persons can conceive any possible modifications based on the present utility model, and these should be regarded as belonging to the scope of the present utility model. It should be noted that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is said to be "connected" to another element, it can be directly connected to the other element or there may also be intervening elements present. The terms "installation", "connection" and "connection" should be understood in a broad sense. For example, it can be a mechanical connection or an electrical connection, or it can be an internal connection between two components. It can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation manner.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this application belongs. The terminology used herein in the description of the application is for the purpose of describing specific embodiments only and is not intended to limit the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

As shown in Figure 1, the utility model provides a blast furnace coal injection pulverizing system equipped with a negative pressure device for a pulverized coal bunker, including a mill 1, a bag dust collector 18, a pulverized coal bunker 17, a main exhaust fan 23 and a control unit. The top of the pulverized coal bin 17 is connected with a moisture suction pipe 15. The outlet of the moisture suction pipe 15 is connected to the entrance of the bag dust collector through the first branch 11 or the second branch 13 arranged in parallel. The second branch 13 is on A negative pressure device is provided. The negative pressure device includes an ejector 4. The ejector 4 is connected to an ejector gas tank 9. An ejector nozzle is provided in the ejector 4. The ejector airflow supplied by the ejector gas tank 9 flows from the ejector nozzle. The ejection forms a negative pressure area; the mill 1, the bag dust collector 18, the pulverized coal bin 17, the main exhaust fan 23, the first branch 11, the second branch 13, and the negative pressure device are all electrically connected to the control unit.

When the blast furnace coal injection and pulverizing system equipped with a negative pressure device for a pulverized coal bunker of the present invention is operating normally, the gas in the pulverized coal bunker 17 is extracted through the main exhaust fan 23 and discharged. The pulverized coal bunker 17 can maintain a load of about -1KPa. Pressure state; when the pulverizing system is inspected and stopped working, the negative pressure device starts to work, so that the pulverized coal bunker is in a negative pressure state; the pulverized coal bunker of the utility model is always in a negative pressure state, reducing the content of combustible gases such as O ₂ and CO , improve the safety of the system; and can effectively discharge water vapor in the warehouse, thereby reducing the moisture content of pulverized coal, improving the fluidity of pulverized coal, and avoiding clogging of powder conveying pipes or spray guns due to high moisture content, thereby affecting blast furnace production.

The ejector is the core structure of the negative pressure device. It has a simple structure and is durable. It can work only by relying on the pressure, temperature and other parameters of the fluid. It does not require any transmission components; it does not need to consume external mechanical energy or electrical energy, saving energy consumption. Reduce project investment.

The utility model effectively solves the problem that the pulverized coal bunker cannot maintain negative pressure when the pulverizing system is inspected and stopped, causing water vapor, CO and other combustible gases in the pulverized coal bunker to be unable to be discharged in time; the entire device is simpler and does not require additional bags or The fan saves money and solves the problem of equipment occupying space.

Further, as shown in Figure 1, the ejector 4 is connected to the ejector gas tank 9 through the ejector gas pipeline 8. The ejector gas pipeline 8 is provided with a flow regulating valve 5, a flow meter 6 and a fifth shut-off valve 7. The flow regulating valve 5. The flow meter 6 and the fifth shut-off valve 7 are both electrically connected to the control unit. The flow meter 6 and the flow regulating valve 5 cooperate to control the flow, adjust the ejection capacity of the ejector, and ensure that the pressure of the pulverized coal bunker is maintained at the set value.

Further, as shown in Figure 1, a pressure transmitter 19 is connected to the top of the pulverized coal bunker 17; a first cut-off valve 12 and a second cut-off valve 10 are set on the first branch 11, and the second branch 13 is located on the injection valve. The third cut-off valve 14 and the fourth cut-off valve 3 are respectively provided at both ends of the device 4; the pressure transmitter 19, the first cut-off valve 12, the second cut-off valve 10, the third cut-off valve 14 and the fourth cut-off valve 3 are all connected with The control unit is electrically connected.

The negative pressure device takes into account the wear and tear of the pulverized coal on the device, and only uses the ejector 4 when the pulverizing system is not working, which greatly improves the life of the ejector. The parts in contact with coal powder are all wear-resistant parts, and the outside is covered with rock wool to reduce noise. The inner cavity of the ejector is lined with a wear-resistant ceramic layer, and the ejector nozzle is made of wear-resistant metal or ceramic materials.

Further, as shown in Figure 1, the moisture suction pipe 15 is provided with a wear-resistant metal hose 16.

In this embodiment, the injection gas tank 9 is a nitrogen tank.

Further, as shown in FIG. 1 , the mill 1 is connected to the bag dust collector 18 through the bag dust collector inlet pipe 2 , and the outlets of the first branch 11 and the second branch 13 are connected to the bag powder collector inlet pipe 2 .

Further, as shown in FIG. 1 , a pulverized coal screen 20 is provided between the bag pulverizer 18 and the pulverized coal bin 17 .

Further, as shown in FIG. 1 , the bag powder collector 18 is connected to the main exhaust fan 23 through the bag outlet pipe 21 , and the outlet of the main exhaust fan 23 is connected to the dispersion pipe 22 .

When the blast furnace coal injection pulverizing system equipped with a negative pressure device for a pulverized coal bunker of the present invention is operating normally,

The ejector 4 does not need to be operated, the fourth cut-off valve 3 and the third cut-off valve 14 remain closed (the first branch 11 is closed), and the second cut-off valve 10 and the first cut-off valve 12 remain open (the second branch 13 is opened) , since the inlet of the bag dust collector 18 is in a negative pressure state (about -10KPa), the gas in the pulverized coal bunker 17 enters the bag powder collector 18 through the first branch 11, and is extracted by the main exhaust fan 23 and passes through the release pipe 22 Discharge, the pulverized coal bin 17 can maintain a negative pressure state of about -1KPa.

When the main exhaust fan 23 stops working, once the pressure transmitter 19 on the top of the pulverized coal bin detects that the pressure in the bin exceeds the preset value, it will automatically open the fourth shut-off valve 3 and the fifth shut-off valve 3 through chain control of the control part (automated program). The shut-off valve 7 and the third shut-off valve 14 close the second shut-off valve 10 and the first shut-off valve 12. The high-speed nitrogen flow is ejected from the injection nozzle in the ejector 4 to form a negative pressure area. The gas in the pulverized coal bunker 17 is extracted. After the two gases are mixed, kinetic energy exchange is realized to form a medium-pressure mixed air flow, which enters the bag collection. The powderer 18 is then discharged to the atmosphere along the bag outlet pipe 21-main exhaust fan 23-dispersion pipe 22.

From the above, the blast furnace coal injection pulverizing system equipped with a pulverized coal bunker negative pressure device of the present invention has the following features:

Beneficial effects:

When the blast furnace coal injection pulverizing system equipped with a negative pressure device for a pulverized coal bunker of the present invention is operating normally, the gas in the pulverized coal bunker is extracted and discharged through the main exhaust fan, and the pulverized coal bunker can maintain a negative pressure state of about -1KPa; When the pulverizing system is inspected and stopped working, the negative pressure device starts working to put the pulverized coal bunker in a negative pressure state; the pulverized coal bunker of the utility model is always in a negative pressure state, reducing the content of combustible gases such as _O2 and CO, and improving the system It is safe; and it can effectively discharge water vapor in the warehouse, thereby reducing the moisture content of pulverized coal, improving the fluidity of pulverized coal, and avoiding clogging of powder conveying pipelines or spray guns due to high moisture content, thereby affecting blast furnace production;

The ejector is the core structure of the negative pressure device. It has a simple structure and is durable. It can work only by relying on the pressure, temperature and other parameters of the fluid. It does not require any transmission components; it does not need to consume external mechanical energy or electrical energy, saving energy consumption. Reduce project investment;

The utility model effectively solves the problem that the pulverized coal bunker cannot maintain negative pressure when the pulverizing system is inspected and stopped, causing water vapor, CO and other combustible gases in the pulverized coal bunker to be unable to be discharged in time; the entire device is simpler and does not require additional bags or The fan saves money and solves the problem of equipment occupying space.

The above descriptions are only illustrative embodiments of the present invention and are not intended to limit the scope of the present invention. Any equivalent changes and modifications made by those skilled in the art without departing from the concept and principles of the present utility model shall fall within the scope of protection of the present utility model.

Claims (10)

1. The blast furnace coal injection pulverizing system with the pulverized coal bin negative pressure device comprises a mill, a cloth bag pulverized coal collector, a pulverized coal bin, a main exhaust fan and a control part, and is characterized in that the top of the pulverized coal bin is communicated with a moisture absorption pipe, an outlet of the moisture absorption pipe is communicated with an inlet of the cloth bag pulverized coal collector through a first branch or a second branch which are arranged in parallel, a negative pressure device is arranged on the second branch, the negative pressure device comprises an ejector, the ejector is communicated with an ejector gas tank, an ejector nozzle is arranged in the ejector, and an ejector gas flow supplied by the ejector gas tank is ejected from the ejector nozzle to form a negative pressure zone; the mill, the cloth bag powder collector, the coal dust bin, the main exhaust fan, the first branch, the second branch and the negative pressure device are all electrically connected with the control part.

2. The blast furnace coal injection pulverizing system with the pulverized coal bin negative pressure device according to claim 1, wherein the ejector is communicated with the injection gas tank through an injection gas pipeline, a flow regulating valve, a flowmeter and a fifth cut-off valve are arranged on the injection gas pipeline, and the flow regulating valve, the flowmeter and the fifth cut-off valve are all electrically connected with the control part.

3. The blast furnace coal injection and pulverizing system provided with the coal powder bin negative pressure device according to claim 2, wherein the top of the coal powder bin is communicated with a pressure transmitter; a first cut-off valve and a second cut-off valve are arranged on the first branch, and a third cut-off valve and a fourth cut-off valve are respectively arranged at two ends of the second branch, which are positioned at the ejector; the pressure transmitter, the first shut-off valve, the second shut-off valve, the third shut-off valve and the fourth shut-off valve are all electrically connected with the control portion.

4. A blast furnace coal injection and pulverizing system with a pulverized coal bunker negative pressure device as set forth in claim 3, wherein a wear-resistant metal hose is arranged on the moisture absorption tube.

5. A blast furnace coal injection and pulverizing system provided with a coal powder bin negative pressure device as claimed in claim 3, wherein the inner cavity of the ejector is lined with a wear-resistant ceramic layer.

6. A blast furnace coal injection and pulverizing system with a negative pressure device of a coal powder bin as set forth in claim 3, wherein the injection nozzle is made of wear-resistant metal or ceramic material.

7. The blast furnace coal injection pulverizing system with the pulverized coal bin negative pressure device according to claim 2, wherein the injection gas tank is a nitrogen gas tank.

8. The blast furnace coal-injection pulverizing system with a pulverized coal bin negative pressure device according to claim 1, wherein the mill is communicated with the bag collector through a bag collector inlet pipeline, and outlets of the first branch and the second branch are communicated with the bag collector inlet pipeline.

9. The blast furnace coal injection and pulverizing system with the coal powder bin negative pressure device according to claim 1, wherein a coal powder sieve is arranged between the cloth bag powder collector and the coal powder bin.

10. The blast furnace coal injection and pulverizing system with the coal powder bin negative pressure device according to claim 1, wherein the cloth bag powder collector is communicated with the main exhaust fan through a cloth bag outlet pipeline, and an outlet of the main exhaust fan is communicated with a diffusing pipeline.