Cut-in type multi-layer jet flow pulverized coal concentration adjusting device and system

Abstract

The utility model discloses a cut-in type multi-layer jet flow pulverized coal concentration adjusting device which comprises a pulverized coal pipeline. An air chamber is coaxially and fixedly connected outside the pulverized coal pipeline, the air chamber is fixedly connected with an air supply pipe, at least one layer of jet spray pipes are arranged in the air chamber, each layer of jet spray pipes are fixedly connected with the pulverized coal pipeline and are communicated with an inner hole of the pulverized coal pipeline, the jet spray pipes are uniformly distributed around the pulverized coal pipeline, and nozzle directions of all the jet spray pipes on the same layer are consistent; a certain angle a is formed between the central axis of each jet nozzle and the central axis of the pulverized coal pipeline, and a is more than 0 degree and less than or equal to 90 degrees; the air supply pipe is connected with a branch air inlet pipe; a ball valve, a flow meter and a regulating valve are arranged on the branch air inlet pipe; the branch air inlet pipes are connected with a main air inlet pipe; a main valve is arranged on the main air inlet pipe; the utility model further discloses a cut-in type multi-layer jet flow pulverized coal concentration adjusting system. The utility model not only has the advantage of good adjusting effect, but also has a non-mechanical adjusting structure, is small in abrasion, can avoid jamming, and can realize remote operation and automatic control.

Description

TECHNICAL FIELD

[0001] The utility model relates to a pulverized coal concentration adjusting device and system, especially a cut-in type multilayer jet flow pulverized coal concentration adjusting device and system for a pulverized coal boiler coal mill. BACKGROUND

[0002] For a pulverized coal boiler, it is crucial to balance the power of each burner through the pulverized system adjustment, and the power of the burner depends on the powder amount of each powder inlet pipe, and since the pulverized coal pipes on the coal mill are connected to different positions of the boiler, the pipeline direction and length are also different. Due to this difference, the resistance of the pulverized coal pipe to the wind-powder mixture is also different, further affecting the flow, causing a large deviation in the amount of pulverized coal in each pulverized coal pipe. The large deviation in the amount of powder will lead to the following problems in the operation of the boiler:

[0003] 1. Large thermal deviation of the heating surface, and easy over-temperature of the tube wall;

[0004] 2. Non-uniform thermal load in the furnace, and local coking phenomenon of the water-cooled wall;

[0005] 3. Coal deposition in the primary air horizontal pipe, which easily leads to pipe blockage and causes the corresponding burner to burn out;

[0006] 4. Non-uniform distribution of NO x at the furnace outlet, leading to non-uniform concentration field of NO x at the entrance of the denitration device, non-uniform ammonia escape amount of the denitration device, and risk of ammonium bisulfate blockage of the air preheater;

[0007] 5. If the burner with a large amount of powder is located on the two side walls, the O2 on the two side walls is extremely low, and the CO is extremely high, increasing the probability of high-temperature corrosion of the side wall water-cooled wall.

[0008] The commonly used pulverized coal concentration adjusting device is a mechanical adjusting mechanism such as an adjustable orifice or a louvered coal powder distributor, which not only has limited adjusting effect, but also has defects such as easy wear, jamming, inconvenient adjustment, etc., affecting the service life, and is difficult to realize remote operation and automatic control. SUMMARY

[0009] The utility model aims at the above-mentioned defects of the prior art, and provides a cut-in type multilayer jet flow pulverized coal concentration adjusting device and system, which not only has the advantages of good adjusting effect, but also is a non-mechanical adjusting structure, has small wear, can avoid jamming, and can realize remote operation and automatic control.

[0010] In order to achieve the above object, the utility model discloses a cut-in multilayer jet flow coal powder concentration regulating device, including coal powder pipeline, its characterized in that: the wind chamber is fixedly connected to the coal powder pipeline coaxially, the wind chamber is fixedly connected with the air supply pipe, is equipped with at least one layer in the wind chamber, and each layer is equipped with several jet flow nozzles, several jet flow nozzles are all fixedly connected with the coal powder pipeline and communicate with its inner hole, and several jet flow nozzles are evenly distributed around the coal powder pipeline, the jet flow nozzles of all the same layers are consistent with the jet flow nozzles of all the same layers, the center axis of all jet flow nozzles and the center axis of the coal powder pipeline are a certain angle a, and 0 is less than a and is less than or equal to 90, the air supply pipe is connected with the branch air inlet pipe, is equipped with a ball valve, a flowmeter and a regulating valve on the branch air inlet pipe, the branch air inlet pipe is connected with the main air inlet pipe, and is equipped with a total valve on the main air inlet pipe.

[0011] The utility model uses, through the air supply pipe to the wind chamber and give in high pressure air, and the high pressure air in the wind chamber enters each jet flow nozzle and forms the regulation wind, and the regulation wind is injected into the coal powder pipeline, because the center axis of all jet flow nozzles and the center axis of the coal powder pipeline are a certain angle a, and 0 is less than a and is less than or equal to 90, namely the injection direction of regulation wind and the primary air powder flow direction in the coal powder pipeline are perpendicular or obliquely opposite, can increase the resistance of primary air powder and disturb the flow field, and then realize the purpose of reducing the coal powder amount in the coal powder pipeline, thereby adjusting the coal powder concentration, when being used for multiple coal powder pipelines, the powder amount distribution of each coal powder pipeline can be more uniform, the device can form multiple, multilayer, multi-angle regulation wind through at least one layer, and each layer is equipped with several jet flow nozzles, not only has the advantage that the adjusting effect is good, and each component is fixedly connected, and only through the air supply pipe and high pressure air can be input, and it is a non-mechanical adjusting structure, and the wear is small, and the jamming can be avoided, and the service life can be prolonged, and the cold primary air flow in each air supply pipe is controlled through the regulating valve,

[0012] As a further improvement of the utility model, the center axis of the jet flow nozzle and the tangent of the cross section circle of the coal powder pipeline are a certain angle b, and 0 is less than b and is less than or equal to 180, the jet flow nozzle is adjusted relative to the cross section circle of the coal powder pipeline in a large range, the effect of disturbing the flow field can be improved, and the coal powder flow in the coal powder pipeline can be adjusted in a large range;

[0013] As a further improvement of the utility model, the wind chamber is equipped with more than two layers of several jet flow nozzles, and the jet flow nozzles of the adjacent two layers are consistent or opposite, the regulation wind of different working conditions can be formed, and the adjusting requirement of different coal powder flow can be met;

[0014] The utility model discloses a cut into formula multilayer jet flow coal powder concentration regulating system, including several cut into formula multilayer jet flow coal powder concentration regulating device, and the air supply pipe of each cut into formula multilayer jet flow coal powder concentration regulating device is connected with respective branch air inlet pipe, and is equipped with ball valve, flowmeter and regulating valve on branch air inlet pipe, and each branch air inlet pipe is connected with main air inlet pipe, and is equipped with total valve on main air inlet pipe, when using, main air inlet pipe is inhaled cold primary air, and each coal powder pipeline is connected with the powder outlet cylinder of same coal mill, when the coal powder flow in each coal powder pipeline is different because of the trend and length, can control the cold primary air flow in each air supply pipe through regulating valve, forms different primary air powder's resistance in each coal powder pipeline, can realize the powder comprehensive air pressure in each coal powder pipeline and the more even distribution of powder amount distribution, guarantees the coal powder regulating effect, avoids the series problem caused by the coal powder amount deviation of combustor

[0015] As the further improvement of the utility model, the total valve is quick cut-off pneumatic ball valve, the ball valve is manual ball valve, and the regulating valve is electric regulating valve; The quick cut-off pneumatic ball valve can ensure the safety of the system; Remote adjustment and automatic control of coal powder concentration can be realized through the manual ball valve and the electric regulating valve, and the flow condition can be observed in real time through the flowmeter;

[0016] In summary, the utility model not only has the advantages of good regulating effect, and is non-mechanical adjusting structure, which has small wear and can avoid jamming, and remote operation and automatic control can be realized. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is the perspective drawing of the cut into formula multilayer jet flow coal powder concentration regulating device embodiment one of the utility model.

[0018] Figure 2 It is the top view of the cut into formula multilayer jet flow coal powder concentration regulating device embodiment one. Figure 1

[0019] Figure 3 It is the front view of the cut into formula multilayer jet flow coal powder concentration regulating device embodiment one. Figure 1

[0020] Figure 4 It is the perspective drawing of the cut into formula multilayer jet flow coal powder concentration regulating device embodiment two of the utility model.

[0021] Figure 5 It is the top view of the cut into formula multilayer jet flow coal powder concentration regulating device embodiment two. Figure 4

[0022] Figure 6 It is the front view of the cut into formula multilayer jet flow coal powder concentration regulating device embodiment two. Figure 4

[0023] Figure 7 It is the pipeline structure diagram of the cut into formula multilayer jet flow coal powder concentration regulating system embodiment of the utility model. DETAILED DESCRIPTION

[0024] ​​​​The utility model is further illustrated below with reference to the drawings.

[0025] Embodiment one

[0026] As Figures 1 to 3 shown, the cut-in type multilayer jet flow pulverized coal concentration adjusting device of the embodiment comprises a pulverized coal pipeline 1, a coaxial air chamber 2 fixedly connected to the outside of the pulverized coal pipeline, the air chamber 2 is fixedly connected with a blast pipe 3, two layers of four jet flow nozzles 4 are arranged in the air chamber 2, the four jet flow nozzles in the same layer are fixedly connected with the pulverized coal pipeline 1 and communicate with the inner hole thereof, the four jet flow nozzles 4 are uniformly distributed around the pulverized coal pipeline 1, the jet flow nozzles 4 of the two layers are in the same direction, the central axes of all the jet flow nozzles 4 are at a certain angle a with the central axis of the pulverized coal pipeline 1, a=90°, the central axes of all the jet flow nozzles 4 are at a certain angle b with the tangent of the cross section circle of the pulverized coal pipeline 1, b=60°.

[0027] In use, the high-pressure air is fed to the air chamber 2 through the blast pipe 3, the high-pressure air in the air chamber 2 enters the jet flow nozzles 4 to form the adjusting air, the adjusting air is injected into the pulverized coal pipeline 1, since the central axes of all the jet flow nozzles 4 are at 90° with the central axis of the pulverized coal pipeline 1, that is, the injection direction of the adjusting air is perpendicular to the flow direction of the primary air in the pulverized coal pipeline 1, the resistance of the primary air can be increased and the flow field can be disturbed, thereby the purpose of reducing the amount of pulverized coal in the pulverized coal pipeline is achieved, so that the concentration of the pulverized coal is adjusted; the device comprises two layers of a plurality of jet flow nozzles 4, the central axes of the jet flow nozzles 4 are at a certain angle b with the tangent of the cross section circle of the pulverized coal pipeline 1, which can be different, a plurality of layers of adjusting air with multiple angles can be formed, not only the adjusting effect is good, but also the components are fixedly connected, only the high-pressure air is fed through the blast pipe 3, it is a non-mechanical adjusting structure, the wear is small, and the jamming can be avoided, the service life can be prolonged.

[0028] Embodiment two

[0029] As Figures 4 to 5 shown, the cut-in type multilayer jet flow pulverized coal concentration adjusting device of the embodiment compared with embodiment one, the difference is only that the jet flow nozzles 5 and 6 of the two layers are in opposite directions, the angle b1 of the central axis of the jet flow nozzle 5 with the tangent of the cross section circle of the pulverized coal pipeline 1 is less than the angle b2 of the central axis of the jet flow nozzle 6 with the tangent of the cross section circle of the pulverized coal pipeline 1, the central axes of the jet flow nozzles 5 and 6 of the two layers are at a certain angle a1 with the central axis of the pulverized coal pipeline 1, a1=75°.

[0030] The two-layer jet flow nozzles 5, 6 are oppositely arranged, two adjusting airflows in opposite directions are formed, the adjustment range of the pulverized coal flow is larger, b1 is smaller than b2, the injection direction of the adjusting airflows is opposite to the flow direction of the primary air in the pulverized coal pipeline at an angle of 75 degrees, the resistance of the primary air is further increased, the flow field is disturbed, compared with the first embodiment, the amount of the pulverized coal in the pulverized coal pipeline 1 is further reduced, and the adjustment effect of the pulverized coal concentration is increased.

[0031] The number of layers and the number of single layers of the jet flow nozzles of the cutting-type multi-layer jet flow pulverized coal concentration adjustment device can be further increased, the angle a and the angle b of the jet flow nozzles in the same layer can be the same or different, and the cross-sectional shape of the jet flow nozzles can be circular, oval or square.

[0032] As shown in Figure 7 The cutting-type multi-layer jet flow pulverized coal concentration adjustment system of the embodiment of the utility model corresponds to two coal mills, the powder outlet tubes of each coal mill are connected with four burners through four cutting-type multi-layer jet flow pulverized coal concentration adjustment devices; the air supply pipes 3 of each cutting-type multi-layer jet flow pulverized coal concentration adjustment device are connected with the respective air inlet pipes 7, the air inlet pipes 7 are each provided with a manual ball valve 8, a flow meter 9 and an electric regulating valve 10; the air inlet pipes 7 are each connected with a main air inlet pipe 11, and the main air inlet pipe 11 is provided with a quick cut-off pneumatic ball valve 12; during use, the main air inlet pipe 11 is connected with cold primary air, when the pulverized coal flow in each pulverized coal pipeline is different due to the direction and length of the pipeline, the cold primary air flow in each air supply pipe 3 can be controlled through the electric regulating valve 10, the resistance of the primary air in each pulverized coal pipeline is different, the distribution of the powder outlet comprehensive air pressure and the powder outlet amount in each pulverized coal pipeline is more uniform, the pulverized coal adjustment effect is ensured, and the series problems caused by the deviation of the pulverized coal amount in the burners are avoided; the quick cut-off pneumatic ball valve 12 can ensure the safety of the system; the manual ball valve 8 and the electric regulating valve 10 can be used for remote adjustment and automatic control of the pulverized coal concentration, and the flow meter 9 can be used for real-time observation of the flow condition.

[0033] The above embodiments are described, but it should be understood that the above embodiments are only for the purpose of example and illustration, and are not intended to limit the utility model to the scope of the described embodiments.

Claims

1. A cut-in type multi-layer jet coal dust concentration adjusting device comprising a coal dust pipeline; characterized in that: A wind chamber is coaxially fixed outside the coal powder pipeline, the wind chamber is fixed with the air supply pipe, at least one layer of jet pipes is arranged in the wind chamber, a plurality of jet pipes are arranged in each layer, the plurality of jet pipes are fixed with the coal powder pipeline and communicated with the inner hole of the coal powder pipeline, the plurality of jet pipes are uniformly distributed around the coal powder pipeline, the jet nozzles of all jet pipes in the same layer are consistent in direction, the central axes of all jet pipes are at a certain angle a with the central axis of the coal powder pipeline, and 0° < a ≤ 90°; the air supply pipe is connected with the branch air inlet pipe, the ball valve, the flow meter and the regulating valve are arranged on the branch air inlet pipe; the branch air inlet pipe is connected with the main air inlet pipe, and the total valve is arranged on the main air inlet pipe.

2. The cut-in type multi-layer jet coal concentration adjusting device according to claim 1, characterized by: The central axis of the jet pipe is at a certain angle b with the tangent of the cross-section circle of the coal powder pipeline, and 0° < b < 180°.

3. The cut-in type multi-layer jet coal concentration adjusting device according to claim 1 or 2, characterized in that: More than two layers of jet pipes are arranged in the wind chamber, the jet nozzles of adjacent two layers of jet pipes are consistent or opposite in direction.

4. A cut-in type multi-layer jet coal dust concentration adjusting system, characterized by: A plurality of cut-in multi-layer jet coal powder concentration adjusting devices are arranged, each cut-in multi-layer jet coal powder concentration adjusting device is connected with the respective branch air inlet pipe, the ball valve, the flow meter and the regulating valve are arranged on the branch air inlet pipe; each branch air inlet pipe is connected with the main air inlet pipe.

5. The cut-in type multi-layer jet coal concentration adjusting system according to claim 4, characterized in that: The total valve is a quick cut-off pneumatic ball valve, the ball valve is a manual ball valve, and the regulating valve is an electric regulating valve.

Images