Device for increasing secondary air temperature of cement kiln

Abstract

The utility model discloses a device for increasing the secondary air temperature of a cement kiln. The device comprises an original kiln head cover, a cooling machine, a high-temperature branch pipe and a newly-added tertiary air pipe. A part of air volume of tertiary air is guided into the top area of the original kiln head cover through the high-temperature branch pipe and enters the newly-added tertiary air pipe; and the other part of tertiary air blown out of the air chamber enters the top area of the original kiln head cover from the area below the non-newly-added tertiary air pipe of the original kiln head cover, and then enters the newly-added tertiary air pipe. Due to the fact that the stretching-in length of the newly-added tertiary air pipe is larger than the width of the secondary air blowing-out area of the air chamber, secondary air is difficult to blow into the newly-added tertiary air pipe by the fan, and the intersection of the path of the tertiary air entering the tertiary air pipe and the path of the secondary air entering the kiln mouth is few. Therefore, the mixing of secondary air and tertiary air is effectively reduced, and the loss of high-heat air quantity caused by the inflow of the secondary air and the tertiary air pipe is reduced; the method has the characteristics that the investment cost is low, the return rate is high, and the carbon emission is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of cement kiln production, in particular to a device for increasing the secondary air temperature of a cement kiln. Background Art

[0002] How to reduce energy consumption without affecting the use of alternative fuels or the clinker calcining capacity is an urgent problem that cement needs to solve.

[0003] The secondary air entering the kiln mouth and the tertiary air entering the original tertiary air duct above the kiln mouth both need to pass through the original kiln head hood. Since the temperature of the secondary air is higher than that of the tertiary air, there is a mixing process when the two are simultaneously passed into the original kiln head hood, thereby reducing the drop in the temperature of the secondary air entering the kiln mouth, resulting in an increase in fuel use and a waste of energy. Utility Model Content

[0004] In view of the above-mentioned defects of the prior art, a device for increasing the secondary air temperature of a cement kiln is provided, so as to avoid the heat loss of the secondary air and the loss of secondary air volume caused by the secondary air entering the tertiary air duct, thereby improving the calcination capacity in the kiln and reducing the use of primary coal.

[0005] The technical solution adopted by the utility model to solve the above technical problems is:

[0006] The device for increasing the secondary air temperature of a cement kiln comprises an original kiln head cover and a cooler, wherein the original tertiary air duct and the kiln mouth are sequentially connected to one side wall of the original kiln head cover from high to low, the cooler is connected to the bottom of the original kiln head cover and extends outward in the direction where the other side wall of the original kiln head cover is located, and a plurality of air chambers are arranged at the lower part of the cooler, and the air chambers sequentially blow out secondary air and tertiary air from the area below the original kiln head cover at the bottom of the cooler along the extension direction of the cooler;

[0007] The invention is characterized in that: it also includes a high-temperature branch pipe and a newly added tertiary air duct, one end of the high-temperature branch pipe is connected to the original kiln head hood, and the connection point of the high-temperature branch pipe to the original kiln head hood is located in the same height area as the original tertiary air duct, and the pipe openings of the two are arranged relatively to each other; the other end of the high-temperature branch pipe is connected to the shell of the cooler located outside the area below the original kiln head hood; one end of the newly added tertiary air duct is connected to the original tertiary air duct, and the other end extends into the original kiln head hood, the extension length of the newly added tertiary air duct is greater than the width of the secondary air area blown out of the wind chamber, and the pipe opening of the newly added tertiary air duct and the connection point of the high-temperature branch pipe are separated by a certain distance.

[0008] According to the above technical solution, the center line of the high-temperature branch pipe at the connection with the original kiln head cover, the center line of the original tertiary air duct outlet and the center line of the newly added tertiary air duct are on the same straight line.

[0009] According to the above technical solution, the length of the newly added tertiary air duct is 1 / 3 to 1 / 2 of the original kiln head hood width.

[0010] According to the above technical scheme, the high-temperature branch pipe includes a first connector fixedly connected to the cooling machine shell, a high-temperature branch pipe body, a second connector fixedly connected to the original kiln head cover, a sealing butterfly valve arranged in the high-temperature branch pipe body, and an expansion joint connected between the first connector and the high-temperature branch pipe body and between the second connector and the high-temperature branch pipe body; the first connector is located above the high-temperature section air chamber in the middle of the front section of the cooling machine, and the second connector and the newly added tertiary air duct extending into the end of the original kiln head cover shell are arranged relatively.

[0011] According to the above technical solution, multiple wind chambers are set with the area below the original kiln head cover as the starting point. The two wind chambers located in the front blow out tertiary air, and the 2 to 5 wind chambers located in the middle blow out secondary air.

[0012] According to the above technical solution, the original kiln head cover remains unchanged, and the newly added tertiary air duct is fixedly connected to the pipe opening of the original tertiary air duct. In this embodiment, the original kiln head cover is connected to the outer wall of the original tertiary air duct, and the newly added tertiary air duct is connected to the end of the original tertiary air duct.

[0013] According to the above technical scheme, a notch is cut in the area of ​​the original kiln head hood where the original tertiary air duct is located, and the end of the newly added tertiary air duct is fixedly connected to the end of the original tertiary air duct and extends into the original kiln head hood; it also includes a newly added kiln head hood, which is composed of multiple steel plates, connected to the notch of the original kiln head hood, and extends to the inside of the original kiln head hood and is fixed on the outer wall at the inner end of the newly added tertiary air duct.

[0014] According to the above technical solution, the tertiary air volume introduced by the newly added high-temperature branch pipe accounts for 20% to 40% of the total air volume; the wind speed in the high-temperature branch pipe does not exceed 20m / s.

[0015] According to the above technical solution, the wind speed of the air duct at the interface between the high-temperature branch pipe and the cooler shall not exceed 5m / s.

[0016] The utility model has the following beneficial effects:

[0017] By setting a high-temperature branch pipe on the cooler housing, a part of the tertiary air blown out of the wind chamber below the cooler is introduced into the top area of ​​the original kiln head cover by the high-temperature branch pipe, and enters the newly added tertiary air duct; the other part of the tertiary air blown out of the wind chamber enters the top area of ​​the original kiln head cover from the area below the original kiln head cover that is not the newly added tertiary air duct, and then enters the newly added tertiary air duct. Since the extension length of the newly added tertiary air duct is greater than the width of the secondary air area blown out of the wind chamber, the secondary air is difficult to be blown into the newly added tertiary air duct by the fan, and the path of the tertiary air entering the tertiary air duct has less intersection with the path of the secondary air entering the kiln mouth; thereby effectively reducing the mixing of the secondary air and the tertiary air, and reducing the loss of high heat air volume caused by the inflow of secondary air and the tertiary air duct. In this embodiment, the newly added tertiary air duct mouth and the high-temperature branch pipe connection are separated by a certain distance, so as to allow the clinker carried in the secondary air derived from the high-temperature branch pipe to undergo secondary precipitation, and the precipitated clinker falls from the top of the kiln head cover.

[0018] Based on the above structure, the secondary air and tertiary air of the original kiln head hood can be clearly separated, reducing the mixed heat exchange between the two, avoiding the heat loss of the secondary air and avoiding the loss of secondary air volume caused by the secondary air entering the tertiary air duct, improving the calcination capacity in the kiln, and reducing the use of head coal. It has the characteristics of low investment cost, high return rate and reduced carbon emissions. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a front view of an embodiment provided by the utility model;

[0020] Figure 2 It is a top view of an embodiment provided by the utility model;

[0021] Figure 3 It is a partial side view of a cooler and a high-temperature branch pipe of an embodiment provided by the utility model;

[0022] Figure 4 It is a side view of the internal structure of the cooling machine and kiln head cover provided in the embodiment of the utility model;

[0023] In the figure, 1. original kiln head hood; 2. cooler; 3. original tertiary air duct; 4. kiln mouth; 5. air chamber; 6. high-temperature branch pipe; 6-1. first connector; 6-2. high-temperature branch pipe body; 6-3. second connector; 6-4. sealing butterfly valve; 6-5. expansion joint; 7. newly added tertiary air duct; 8. newly added kiln head hood. DETAILED DESCRIPTION

[0024] The utility model is described in detail below with reference to the accompanying drawings and embodiments.

[0025] Reference Figure 1 to Figure 4 As shown, the utility model provides a device for increasing the secondary air temperature of a cement kiln.

[0026] Example 1

[0027] It includes an original kiln head cover 1 and a cooler 2. The original tertiary air duct 3 and the kiln mouth 4 are connected to one side wall of the original kiln head cover in sequence from high to low. The cooler is connected to the bottom of the original kiln head cover and extends outward in the direction of the other side wall of the original kiln head cover. A plurality of air chambers 5 are arranged at the lower part of the cooler. The air chambers are at the bottom of the cooler and blow out secondary air and tertiary air in sequence from the area below the original kiln head cover along the extension direction of the cooler.

[0028] It also includes a high-temperature branch pipe 6 and a newly added tertiary air duct 7, one end of the high-temperature branch pipe is connected to the original kiln head hood, and the connection between the high-temperature branch pipe and the original kiln head hood is located in the same height area as the original tertiary air duct, and the pipe openings of the two are arranged relatively to each other; the other end of the high-temperature branch pipe is connected to the shell of the cooler located outside the area below the original kiln head hood; one end of the newly added tertiary air duct is connected to the original tertiary air duct, and the other end extends into the original kiln head hood, the extension length of the newly added tertiary air duct is greater than the width of the secondary air area blown out of the wind chamber, and the pipe opening of the newly added tertiary air duct and the connection between the high-temperature branch pipe are separated by a certain distance.

[0029] In this embodiment, by setting a high-temperature branch pipe on the cooling machine housing, a part of the tertiary air blown out of the wind chamber below the cooling machine is introduced into the top area of ​​the original kiln head cover by the high-temperature branch pipe, and enters the newly added tertiary air duct; the other part of the tertiary air blown out of the wind chamber enters the top area of ​​the original kiln head cover from the area below the original kiln head cover that is not the newly added tertiary air duct, and then enters the newly added tertiary air duct. Since the extension length of the newly added tertiary air duct is greater than the width of the secondary air area blown out of the wind chamber, it is difficult for the secondary air to be blown into the newly added tertiary air duct by the fan, and the path of the tertiary air entering the tertiary air duct has less intersection with the path of the secondary air entering the kiln mouth; thereby effectively reducing the mixing of the secondary air and the tertiary air, and reducing the loss of high heat air volume caused by the inflow of secondary air and the tertiary air duct. In this embodiment, the newly added tertiary air duct mouth and the high-temperature branch pipe connection are separated by a certain distance, so as to allow the clinker carried in the secondary air derived from the high-temperature branch pipe to undergo secondary precipitation, and the precipitated clinker falls from the top of the kiln head cover.

[0030] Based on the above structure, the secondary air and tertiary air of the original kiln head hood can be clearly separated, reducing the mixed heat exchange between the two, avoiding the heat loss of the secondary air and avoiding the loss of secondary air volume caused by the secondary air entering the tertiary air duct, improving the calcination capacity in the kiln, and reducing the use of head coal. It has the characteristics of low investment cost, high return rate and reduced carbon emissions.

[0031] In Example 1, preferably, the center line of the high-temperature branch pipe at the connection point of the original kiln head cover, the center line of the original tertiary air duct outlet and the center line of the newly added tertiary air duct are on the same straight line.

[0032] In Example 1, the length of the newly added tertiary air duct is preferably 1 / 3 to 1 / 2 of the original kiln head hood width, so as to achieve the purpose of covering the secondary air chamber; allowing all the secondary air to enter the kiln to prevent the air from other air chambers from mixing with it for heat exchange and lowering the temperature of the air entering the kiln.

[0033] Example 2

[0034] The structure and principle of Example 2 are similar to those of Example 1, except that: a preferred high-temperature branch pipe structure is provided; the high-temperature branch pipe includes a first connector 6-1 fixedly connected to the cooling machine housing, a high-temperature branch pipe body 6-2, a second connector 6-3 fixedly connected to the original kiln head cover, a sealing butterfly valve 6-4 arranged in the high-temperature branch pipe body, and an expansion joint 6-5 connected between the first connector and the high-temperature branch pipe body and between the second connector and the high-temperature branch pipe body; the first connector is located above the high-temperature section air chamber in the middle of the front section of the cooling machine, and the second connector and the newly added tertiary air duct extending into the end of the original kiln head cover are arranged relatively. In this embodiment, a closed butterfly valve is arranged in the newly added tertiary air duct to adjust the air volume entering the high-temperature branch pipe according to demand, and to cut off the connection of the high-temperature branch pipe according to demand.

[0035] Preferably, a plurality of air chambers are arranged with the area below the original kiln head cover as the starting point, the two air chambers located at the front blow out tertiary air, and the 2 to 5 air chambers located in the middle blow out secondary air.

[0036] Example 3

[0037] The structure and principle of Example 3 are similar to those of Example 1 or 2, except that the original kiln head cover remains unchanged, and the newly added tertiary air duct is fixedly connected to the pipe opening of the original tertiary air duct. In this embodiment, the original kiln head cover is connected to the outer wall of the original tertiary air duct, and the newly added tertiary air duct is connected to the end of the original tertiary air duct. This embodiment is not shown in the figure.

[0038] Example 4

[0039] The structure and principle of Example 4 are similar to those of Example 1 or 2, except that: a notch is cut in the area of ​​the original kiln head hood where the original tertiary air duct is located, and the end of the newly added tertiary air duct is fixedly connected to the end of the original tertiary air duct and extends into the original kiln head hood; it also includes a newly added kiln head hood 8, which is composed of multiple steel plates, connected to the notch of the original kiln head hood, and extends to the inside of the original kiln head hood and is fixed on the outer wall at the inner end of the newly added tertiary air duct.

[0040] In Examples 1-4, the tertiary air volume introduced by the newly added high-temperature branch pipe accounts for 20% to 40% of the total air volume, and 30% is selected in the embodiment in the figure; the wind speed in the high-temperature branch pipe does not exceed 20m / s.

[0041] In Examples 1-4, the wind speed of the air duct at the interface between the high-temperature branch pipe and the cooler does not exceed 5 m / s to prevent excessive dust from being brought in and causing material accumulation in the tertiary air duct.

[0042] The above are only preferred embodiments of the present invention, and certainly cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the scope of patent application of the present invention still fall within the protection scope of the present invention.

Claims

1. A device for increasing the temperature of secondary air in a cement kiln, comprising an original kiln head cover and a cooler, wherein the original tertiary air duct and the kiln mouth are sequentially connected to one side wall of the original kiln head cover from high to low, the cooler is connected to the bottom of the original kiln head cover and extends outward in the direction of the other side wall of the original kiln head cover, and a plurality of air chambers are arranged at the bottom of the cooler, and the air chambers sequentially blow out secondary air and tertiary air from the area below the original kiln head cover along the extension direction of the cooler at the bottom of the cooler; Features: It also includes a high-temperature branch pipe and a newly added tertiary air duct. One end of the high-temperature branch pipe is connected to the original kiln head cover. The connection point of the high-temperature branch pipe to the original kiln head cover is located at the same height area as the original tertiary air duct, and the two pipe openings are arranged oppositely. The other end of the high-temperature branch pipe is connected to the shell of the cooler outside the area below the original kiln head cover; one end of the newly added tertiary air duct is connected to the original tertiary air duct, and the other end extends into the original kiln head cover. The extension length of the newly added tertiary air duct is greater than the width of the secondary air area blown out of the wind chamber, and the pipe opening of the newly added tertiary air duct and the connection point of the high-temperature branch pipe are separated by a certain distance.

2. The device for increasing the secondary air temperature of a cement kiln according to claim 1, characterized in that: The center line of the high-temperature branch pipe at the connection with the original kiln head cover, the center line of the original tertiary air duct outlet and the center line of the newly added tertiary air duct are on the same straight line.

3. The device for increasing the secondary air temperature of a cement kiln according to claim 1, characterized in that: The length of the newly added tertiary air duct is 1 / 3 to 1 / 2 of the original kiln head hood width.

4. The device for increasing the secondary air temperature of a cement kiln according to claim 1, characterized in that: The high-temperature branch pipe includes a first connector fixedly connected to the cooling machine shell, a high-temperature branch pipe body, a second connector fixedly connected to the original kiln head cover, a sealing butterfly valve arranged in the high-temperature branch pipe body, and an expansion joint connected between the first connector and the high-temperature branch pipe body and between the second connector and the high-temperature branch pipe body; the first connector is located above the high-temperature section air chamber in the middle of the front section of the cooling machine, and the second connector and the newly added tertiary air duct extending into the end of the original kiln head cover shell are arranged relatively.

5. The device for increasing the secondary air temperature of a cement kiln according to claim 1, characterized in that: A plurality of air chambers are arranged starting from the area below the original kiln head cover. The two air chambers at the front blow out tertiary air, and the 2 to 5 air chambers at the middle blow out secondary air.

6. The device for increasing the secondary air temperature of a cement kiln according to claim 1, characterized in that: The original kiln head cover remains unchanged, and the newly added tertiary air duct is fixedly connected to the pipe opening of the original tertiary air duct.

7. The device for increasing the secondary air temperature of a cement kiln according to claim 1, characterized in that: A notch is cut in the area of ​​the original kiln head hood where the original tertiary air duct is located, and the end of the newly added tertiary air duct is fixedly connected to the end of the original tertiary air duct and extends into the original kiln head hood; it also includes a newly added kiln head hood, which is composed of multiple steel plates, connected to the notch of the original kiln head hood, and extends to the inside of the original kiln head hood and is fixed on the outer wall at the inner end of the newly added tertiary air duct.

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