Coal quantity stabilization and consumption reduction device for cement kiln

Abstract

The utility model relates to a cement kiln coal quantity stabilization and consumption reduction device, which comprises a screw conveyer, a heated bottom plate, a heated spiral plate and a heat preservation shell, the screw conveyer comprises a plurality of sections of shell bodies which are fixedly connected with one another, the heated bottom plate is fixedly arranged on the outer wall of the shell body, and the inner wall of the heated bottom plate abuts against the outer wall of the shell body. The heated spiral plate is fixedly arranged on the heated bottom plate, the heated spiral plate abuts against the heat preservation shell, a spiral channel among the heated bottom plate, the heated spiral plate and the heat preservation shell is a heated channel, the two ends of the heated channel are provided with an air inlet and an air outlet respectively, and a heated rod fixedly arranged on the heated bottom plate is arranged in the heated channel. The spiral conveyor in the device can stably convey pulverized coal, so that when hot air passes through the spiral heated channel, the pulverized coal can be stably heated, and the purposes of saving energy and reducing consumption are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of rotary kiln pulverized coal preheating, in particular to a device for stabilizing coal quantity and reducing consumption in a cement kiln. Background Art

[0002] In the pulverized coal burner of a cement rotary kiln, if the pulverized coal is not preheated, a series of problems will occur, such as slow pulverized coal combustion speed, low flame temperature, long "black fire head", and incomplete pulverized coal combustion.

[0003] For example, as disclosed in a cement rotary kiln pulverized coal preheating and conveying system with the Chinese patent application number CN201420596900.2, a high-temperature gas in the hot air chamber of the grate cooler of the rotary kiln is extracted by a centrifugal fan, conveyed into a disturbing separator for gas-solid separation, and then input into a coal injection pipe to heat the pulverized coal entering the coal injection pipe. Usually, the pulverized coal is heated to 300°C. The high-temperature pulverized coal can burn quickly and fully in the cement rotary kiln, improving the combustion speed and temperature, effectively increasing the heat utilization rate, reducing energy consumption, and reducing the pollutant discharge amount.

[0004] However, in the related solutions of directly carrying pulverized coal by hot air for conveying, the amount of coal is affected by many factors, and the amount of coal provided to the pulverized coal burner cannot be stabilized. Therefore, there may be problems such as insufficient combustion caused by less coal supply or waste caused by excessive coal supply, and there may also be a problem of waste of the heat of the hot air. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a device for stabilizing coal quantity and reducing consumption in a cement kiln to solve the above problems existing in the prior art.

[0006] To solve the above problems, the utility model provides a device for stabilizing coal quantity and reducing consumption in a cement kiln, which includes a screw conveyor, a heated bottom plate, a heated spiral plate, and a heat preservation shell. The screw conveyor includes a plurality of mutually fixed and connected shells. The heated bottom plate is fixedly arranged on the outer wall of the shell, and the inner wall of the heated bottom plate abuts against the outer wall of the shell. The heated spiral plate is fixedly arranged on the heated bottom plate, and the heated spiral plate abuts against the heat preservation shell. The spiral channel between the heated bottom plate, the heated spiral plate, and the heat preservation shell is a heated channel. An air inlet and an air outlet are respectively arranged at both ends of the heated channel. A heated rod fixedly arranged on the heated bottom plate is arranged in the heated channel.

[0007] The device for stabilizing coal quantity and reducing consumption in a cement kiln provided by the utility model further has the following technical features:

[0008] Further, the heated rods are uniformly arranged in the radial direction of the heated bottom plate.

[0009] Furthermore, the heat-receiving bottom plate, the heat-receiving spiral plate, and the heat-receiving rod are made of the same metal material, and the housing is made of a metal material with better thermal conductivity than the heat-receiving bottom plate, the heat-receiving spiral plate, and the heat-receiving rod.

[0010] Furthermore, the heat-receiving bottom plate is provided with through grooves for embedding the heat-receiving spiral plate and the heat-receiving rod, so that the heat-receiving spiral plate and the heat-receiving rod are directly in contact with the housing.

[0011] Furthermore, the air inlet and the exhaust outlet are tangent to the outer wall of the heat-receiving bottom plate and the inner wall of the heat-insulating housing.

[0012] Furthermore, the air inlet and the exhaust outlet are horizontally arranged and are provided on the lower side of the heat-insulating housing. Both ends of the heat-receiving spiral plate are arranged at the upper end of the heat-receiving bottom plate. The air inlet faces the direction in which the heat-receiving spiral plate spirals forward to the exhaust outlet, and the orientation of the exhaust outlet is set relative to the orientation of the air inlet.

[0013] Furthermore, a blower is provided outside the air inlet and / or the exhaust outlet.

[0014] Furthermore, temperature sensors are provided in the air inlet, the exhaust outlet, and the heat-receiving channel, and an electromagnetic valve for controlling the air intake volume is also provided at the air inlet.

[0015] Furthermore, the heat-insulating housing and the housing are fixedly connected through flange plates provided at their respective two ends, and are hermetically connected between the heat-insulating housing and the housing.

[0016] Furthermore, heat-insulating materials are provided on the heat-insulating housing.

[0017] The utility model has the following beneficial effects: The screw conveyor in this device can stably convey pulverized coal. Therefore, when hot air passes through the spiral heat-receiving channel, it can stably heat the pulverized coal, and there will be no problem of insufficient combustion caused by less coal supply or waste caused by excessive coal supply; moreover, the hot air can efficiently heat the heat-receiving bottom plate, the heat-receiving spiral plate, and the heat-receiving rod through the spiral heat-receiving channel, and further preheat the pulverized coal. The use efficiency of hot air is very high, and there will be no excessive waste of heat energy, which can achieve the purpose of energy consumption reduction. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic diagram of the overall structure of the utility model;

[0019] Figure 2 is Figure 1 a top view perspective of a partial component cross-sectional view along line A-A in

[0020] Figure 3 is a schematic diagram of the structural decomposition of the utility model;

[0021] Figure 4 is a schematic diagram of the heat-receiving bottom plate and the heat-receiving spiral plate of the utility model;

[0022] Figure 5 For Figure 4 The detailed view at position B in

[0023] Figure 6 For Figure 4 The detailed view at position C in Specific implementation manners

[0024] The present utility model will be described in detail below with reference to the accompanying drawings and in combination with embodiments. It should be noted that, without conflict, the embodiments in the present utility model and the features in the embodiments may be combined with each other.

[0025] As Figures 1 to 6 In the embodiment of the coal amount stabilization and consumption reduction device for a cement kiln of the present utility model shown, the coal amount stabilization and consumption reduction device for a cement kiln includes a screw conveyor 1, a heated bottom plate 2, a heated spiral plate 3, and a heat preservation shell 4. The screw conveyor 1 includes a plurality of mutually fixed and connected shells 11, and further includes a screw conveyor rod 12 and screw conveyor blades arranged in the shell 11. The screw conveyor rod 12 is connected to the shell 11 through a suspension shaft (not shown in the figure); the pulverized coal that needs to be preheated in this device is transported in the shell 11 of the screw conveyor 1; the plurality of shells 11 can heat the pulverized coal at different segments simultaneously, which can significantly improve the heating efficiency.

[0026] In this device, the shell 11 can use a cylinder body with flange plates at both ends, and at least one of the flange plates is detachable (i.e., connected to the shell 11 by means of bolts, etc.). The heated bottom plate 2 is fixedly arranged on the outer wall of the shell 11. The heated bottom plate 2 can adopt an integral cylinder. The two ends of the heated bottom plate 2 can be clamped by the flange plates of the shell 11, and bolts and other means can be used to fixedly arrange the heated bottom plate 2 on the outer wall of the shell 11; the heated bottom plate 2 is nested on the outer wall of the shell 11, and the inner wall of the heated bottom plate 2 abuts against the outer wall of the shell 11, and the two are closely combined, so that the heat on the heated bottom plate 2 can be smoothly conducted to the shell 11 to heat the pulverized coal transported in the shell 11.

[0027] The heated spiral plate 3 is fixedly arranged on the heated bottom plate 2, and can be fixedly connected by means of welding, etc. The heated spiral plate 3 abuts against the heat preservation shell 4, so that a spiral channel is formed between the heated bottom plate 2, the heated spiral plate 3, and the heat preservation shell 4. This spiral channel is the heated channel. An air inlet 41 and an air outlet 42 are respectively arranged at both ends of the heated channel. A heated rod 21 fixedly arranged on the heated bottom plate 2 is arranged in the heated channel.

[0028] The hot air at the air inlet 41 can be provided by the hot air chamber of the grate cooler of the rotary kiln. During the process of the hot air passing through the spiral-shaped heated channel, the heat of the hot air is conducted to the heated bottom plate 2, the heated spiral plate 3, and the heated rod 21, and then conducted to the shell 11 to efficiently heat the pulverized coal transported in the shell 11.

[0029] In this device, the screw conveyor 1 can stably convey pulverized coal. Therefore, when hot air passes through the spiral heat-receiving channel, it can stably heat the pulverized coal, and there will be no problem of insufficient combustion caused by less coal supply or waste caused by excessive coal supply. Moreover, the hot air passing through the spiral heat-receiving channel can efficiently heat the heat-receiving bottom plate 2, the heat-receiving spiral plate 3 and the heat-receiving rod 21, and further preheat the pulverized coal. The efficiency of using hot air is very high, and there will be no excessive waste of heat energy, which can achieve the purpose of energy consumption reduction.

[0030] In an embodiment of the present application, preferably, the heat-receiving rods 21 are uniformly arranged in the radial direction of the heat-receiving bottom plate 2, so that the heat-receiving rods 21 are more affected by the hot air, so that the heat-receiving rods 21 can transfer more heat of the hot air and uniformly provide heat for the heat-receiving bottom plate 2 and the housing 11.

[0031] In an embodiment of the present application, preferably, the heat-receiving bottom plate 2, the heat-receiving spiral plate 3 and the heat-receiving rod 21 are made of the same metal material, and the housing 11 is made of a metal material with better thermal conductivity than the heat-receiving bottom plate 2, the heat-receiving spiral plate 3 and the heat-receiving rod 21. In this way, the efficiency of heat conduction of the hot air can be maximized.

[0032] In an embodiment of the present application, preferably, the heat-receiving bottom plate 2 is provided with through grooves for embedding the heat-receiving spiral plate 3 and the heat-receiving rod 21, so that the heat-receiving spiral plate 3 and the heat-receiving rod 21 are directly in contact with the housing 11. In this way, there is no structural fault between the heat-receiving spiral plate 3 and the housing 11 and between the heat-receiving rod 21 and the housing 11, so as to increase the heat conduction efficiency.

[0033] In an embodiment of the present application, preferably, the air inlet 41 and the air outlet 42 are tangent to the outer wall of the heat-receiving bottom plate 2 and the inner wall of the heat-insulating housing 4, so that the hot air entering from the air inlet 41 can smoothly enter the spiral heat-receiving channel and the hot air can be further discharged.

[0034] In an embodiment of the present application, preferably, please refer to Figure 3 , the air inlet 41 and the air outlet 42 are horizontally arranged and provided on the lower side of the heat-insulating housing 4. Both ends of the heat-receiving spiral plate 3 are arranged at the upper end of the heat-receiving bottom plate 2. The air inlet 41 faces the direction of the spiral advancement of the heat-receiving spiral plate 3 to the air outlet 42, and the orientation of the air outlet 42 is set relative to the orientation of the air inlet 41. When the hot air enters from the air inlet 41, the hot air can smoothly advance along the spiral direction of the heat-receiving spiral plate 3 and finally be smoothly discharged from the air outlet 42. There is no other irrelevant heat obstruction during the process of the hot air passing through the heat-receiving channel, which improves the passing efficiency of the hot air in the heat-receiving channel.

[0035] In an embodiment of the present application, preferably, a fan is provided outside the air inlet 41 and / or the air outlet 42 to enable the hot air to smoothly pass through the heat-receiving channel.

[0036] In an embodiment of the present application, preferably, temperature sensors are provided in the air inlet 41, the air outlet 42, and the heat receiving channel. An electromagnetic valve for controlling the air intake is also provided at the air inlet 41. In this way, when the temperature at nodes such as the heat receiving channel, its air inlet, and air outlet is too high or too low, the temperature can be adjusted by controlling the air intake volume.

[0037] In an embodiment of the present application, preferably, the heat insulation housing 4 and the housing 11 are fixedly connected through flange plates provided at their respective two ends, and are hermetically connected between the heat insulation housing 4 and the housing 11. In this way, the heat of the hot air will not overflow.

[0038] In an embodiment of the present application, preferably, heat insulation materials are provided on the heat insulation housing 4 to improve the utilization rate of the heat of the hot air.

[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A device for stabilizing coal quantity and reducing consumption in a cement kiln, characterized in that, It includes a screw conveyor (1), a heated bottom plate (2), a heated spiral plate (3) and a heat-insulating shell (4). The screw conveyor (1) includes a plurality of mutually fixedly connected shells (11). The heated bottom plate (2) is fixedly arranged on the outer wall of the shell (11), and the inner wall of the heated bottom plate (2) abuts against the outer wall of the shell (11). The heated spiral plate (3) is fixedly arranged on the heated bottom plate (2), and the heated spiral plate (3) abuts against the heat-insulating shell (4). The spiral channel between the heated bottom plate (2), the heated spiral plate (3) and the heat-insulating shell (4) is a heated channel. An air inlet (41) and an air outlet (42) are respectively arranged at both ends of the heated channel. A heated rod (21) fixedly arranged on the heated bottom plate (2) is arranged in the heated channel.

2. The coal quantity stabilization and consumption reduction device for a cement kiln according to claim 1, characterized in that The heated rods (21) are evenly arranged in the radial direction of the heated bottom plate (2).

3. The coal quantity stabilization and consumption reduction device for a cement kiln according to claim 1, wherein, The heated bottom plate (2), the heated spiral plate (3) and the heated rods (21) are made of the same metal material, and the shell (11) is made of a metal material with better thermal conductivity than the heated bottom plate (2), the heated spiral plate (3) and the heated rods (21).

4. The coal quantity stabilization and consumption reduction device for a cement kiln according to any one of claims 1-3, characterized in that The heated bottom plate (2) is provided with through grooves into which the heated spiral plate (3) and the heated rods (21) can be embedded, so that the heated spiral plate (3) and the heated rods (21) directly abut against the shell (11).

5. The coal quantity stabilization and consumption reduction device for a cement kiln according to claim 1, characterized in that, The air inlet (41) and the air outlet (42) are tangent to the outer wall of the heated bottom plate (2) and the inner wall of the heat-insulating shell (4).

6. The coal quantity stabilization and consumption reduction device for a cement kiln according to claim 5, characterized in that, The air inlet (41) and the air outlet (42) are horizontally arranged and arranged on the lower side of the heat-insulating shell (4). Both ends of the heated spiral plate (3) are arranged at the upper end of the heated bottom plate (2). The air inlet (41) faces the direction in which the heated spiral plate (3) spirals forward to the air outlet (42), and the orientation of the air outlet (42) is set relative to the orientation of the air inlet (41).

7. The coal quantity stabilization and consumption reduction device for a cement kiln according to claim 1, characterized in that A fan is provided outside the air inlet (41) and / or the air outlet (42).

8. The coal quantity stabilization and consumption reduction device for a cement kiln according to claim 1, wherein, Temperature sensors are arranged in the air inlet (41), the air outlet (42) and the heated channel. An electromagnetic valve for controlling the air intake is also arranged at the air inlet (41).

9. The coal quantity stabilization and consumption reduction device for a cement kiln according to claim 1, characterized in that, The heat-insulating shell (4) and the shell (11) are fixedly connected through flange plates provided at their respective two ends, and are hermetically connected between the heat-insulating shell (4) and the shell (11).

10. The coal quantity stabilization and consumption reduction device for a cement kiln according to claim 1, characterized in that, Heat-insulating materials are provided on the heat-insulating shell (4).

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