Kiln tail flue gas cooling structure

Abstract

The utility model discloses a kiln tail flue gas cooling structure, which relates to the technical field of kiln tail flue gas treatment and comprises a waste heat recovery boiler, a merging valve is fixedly mounted on the left side of the top of the waste heat recovery boiler, a gas outlet pipe is fixedly mounted in the left side of the merging valve, and a temperature detector is fixedly mounted in the middle of the gas outlet pipe. And a circulating pipe is fixedly installed on the right side in the merging valve, heat preservation cotton is fixedly installed on the outer side of the circulating pipe, and a heat preservation shell is fixedly installed on the outer side of the heat preservation cotton. According to the kiln tail flue gas cooling structure, the temperature of flue gas recovered by the waste heat recovery boiler is detected through the temperature detector, and when the temperature of the flue gas is too high, the flue gas is fed into the circulating pipe through the control valve to be circulated; flue gas is fed into the merging valve to be merged with the flue gas and then fed into the waste heat recovery boiler to recover waste heat again, and heat preservation is conducted on the circulating pipe through heat preservation cotton on the outer side of the circulating pipe and a heat preservation shell.

Description

Technical Field

[0001] The utility model relates to the technical field of kiln tail smoke treatment, in particular to a kiln tail smoke cooling structure. Background Art

[0002] Kiln tail flue gas refers to the gas discharged from the tail or outlet of the cement kiln. These gases are mainly composed of hot air discharged from the preheater, clinker cooler and kiln tail preheater, and the temperature is generally between 250℃ and 400℃1. This low-temperature waste heat flue gas can be used to produce slightly superheated steam, which can then be used to generate electricity through a steam turbine.

[0003] The existing referenceable Chinese utility model patent with announcement number: CN211739834U discloses a kiln tail smoke chamber, including a smoke chamber body, the smoke chamber body is arranged between the kiln tail of the rotary kiln and the bottom of the decomposition furnace and connects the rotary kiln with the decomposition furnace, a constriction is formed at the connection between the smoke chamber body and the bottom of the decomposition furnace, a feeding port is provided on the side wall of the smoke chamber body, a feeding slope extending from the lower edge of the feeding port to the lower edge of the rotary kiln connecting port is formed at the bottom of the smoke chamber body, a feeding pipe is also connected to the feeding port, the bottom of the constriction is directly connected to the top of the smoke chamber body, and the cross-sectional length of the smoke chamber body is greater than the cross-sectional length of the constriction, and the inclined top surface of the top surface of the smoke chamber body is inclined at 10-15° relative to the horizontal plane. The utility model can significantly improve the ventilation effect of the smoke chamber, improve the phenomenon of skinning in the smoke chamber and the constriction, and increase production capacity.

[0004] Most of the existing kiln tail flue gas cooling structures use waste heat power generation boilers to recover the waste heat of the flue gas and cool the flue gas at the same time. At that time, the flue gas discharged after the waste heat recovery may still contain a large amount of heat, which can easily lead to energy waste. Even if the waste heat power generation boiler cannot exchange heat, the heat in the flue gas can still be used. Utility Model Content

[0005] The utility model aims to overcome the problem of poor energy recovery effect during cooling in the prior art and provides a kiln tail flue gas cooling structure.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A kiln tail flue gas cooling structure, comprising:

[0008] A waste heat recovery boiler, wherein a merging valve is fixedly installed on the top left side of the waste heat recovery boiler, an air outlet pipe is fixedly installed inside the left side of the merging valve, a temperature detector is fixedly installed in the middle of the air outlet pipe, a circulation pipe is fixedly installed on the inner right side of the merging valve, thermal insulation cotton is fixedly installed on the outer side of the circulation pipe, a thermal insulation shell is fixedly installed on the outer side of the thermal insulation cotton, a control valve is fixedly installed in the middle of the circulation pipe, a temperature detector is fixedly installed on the bottom of the control valve, a heat exchanger is fixedly installed on one side of the circulation pipe, an air outlet is fixedly installed on one side of the heat exchanger, two heat exchange tubes are fixedly installed at the rear of the heat exchanger, a water tank is fixedly installed on one side of the heat exchange tube, a water inlet is fixedly installed on the top side of the water tank, and a support frame is fixedly installed on the bottom of the water tank.

[0009] In a preferred embodiment, a connecting pipe is fixedly installed inside the air outlet, and a smoke filter device is fixedly installed on one side of the connecting pipe. The smoke filter device is a structure for filtering smoke.

[0010] In a preferred embodiment, a smoke outlet is fixedly mounted on one side of the top of the smoke filter device, and a bottom plate is fixedly mounted on the bottom of the smoke filter device, and the bottom plate is a structure for supporting the bottom.

[0011] In a preferred embodiment, two bottom blocks are fixedly mounted on both sides of the bottom of the bottom plate, and the bottom blocks are trapezoidal in shape and are structures for support.

[0012] In a preferred embodiment, a smoke outlet device is fixedly installed at the bottom of the air outlet pipe, and a kiln tail smoke chamber is fixedly installed at the bottom of the smoke outlet device.

[0013] In a preferred embodiment, a support plate is fixedly installed on the bottom of one side of the kiln tail smoke chamber, and three support seats are fixedly installed on the top of the support plate. The support seats are structures for supporting the rotary kiln.

[0014] In a preferred embodiment, a rotary kiln is fixedly mounted on the top of the support seat.

[0015] Compared with the prior art, the beneficial effects of the utility model are:

[0016] 1. The kiln tail flue gas cooling structure uses a temperature detector to detect the temperature of the flue gas recovered by the waste heat recovery boiler. When the flue gas temperature is too high, the flue gas is sent to the inside of the circulation pipe through the control valve for circulation. The flue gas is sent to the inside of the merging valve through the circulation pipe and the flue gas is merged and then sent to the inside of the waste heat recovery boiler to recover the waste heat again. The circulation pipe is insulated by the insulation cotton and the insulation shell on the outside of the circulation pipe, which avoids the loss of flue gas heat and improves the energy recovery efficiency of the kiln tail flue gas cooling structure.

[0017] 2. The kiln tail flue gas cooling structure, when the temperature detector detects that the temperature is insufficient, the flue gas is sent into the heat exchanger through the control valve to perform secondary heat exchange on the waste heat of the flue gas, so that the heat in the flue gas is utilized through the heat exchange tube to heat the water inside the water tank, thereby improving the practicability and energy recovery efficiency of the kiln tail flue gas cooling structure, and improving the cooling effect of the kiln tail flue gas cooling structure, avoiding the problem of excessive heat of the flue gas. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0019] Figure 2 It is a schematic diagram of the waste heat recovery boiler in the utility model;

[0020] Figure 3 It is a schematic diagram of the support frame in the utility model;

[0021] Figure 4 It is a schematic diagram of the connecting pipe in the utility model;

[0022] Figure 5 It is a schematic diagram of the smoke outlet device in the utility model.

[0023] 1. Waste heat recovery boiler; 11. Merging valve; 12. Exhaust pipe; 13. Temperature detector; 14. Circulation pipe; 15. Insulation cotton; 16. Insulation shell; 17. Control valve; 18. Temperature detector; 2. Support frame; 21. Heat exchanger; 22. Exhaust port; 23. Heat exchange pipe; 24. Water tank; 25. Water inlet; 3. Connecting pipe; 31. Flue gas filter device; 32. Smoke outlet; 33. Bottom plate; 34. Bottom block; 4. Smoke exhaust device; 41. Kiln tail smoke chamber; 42. Support plate; 43. Rotary kiln; 44. Support seat. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] Combined with Figure 1-Figure 5In this embodiment, a kiln tail flue gas cooling structure includes: a waste heat recovery boiler 1, a merging valve 11 is fixedly installed on the top left side of the waste heat recovery boiler 1, an air outlet pipe 12 is fixedly installed inside the left side of the merging valve 11, a temperature detector 13 is fixedly installed in the middle of the air outlet pipe 12, a circulation pipe 14 is fixedly installed on the right side of the inside of the merging valve 11, a heat insulation cotton 15 is fixedly installed on the outside of the circulation pipe 14, a heat insulation shell 16 is fixedly installed on the outside of the heat insulation cotton 15, a control valve 17 is fixedly installed in the middle of the circulation pipe 14, and a temperature detector 18 is fixedly installed on the bottom of the control valve 17.

[0026] Specifically, the internal temperature of the outlet pipe 12 is detected by the temperature detector 13, and the flue gas refluxed from the circulation pipe 14 and the flue gas in the outlet pipe 12 are combined by the merging valve 11 and sent to the waste heat recovery boiler 1 for waste heat recovery. The circulation pipe 14 can be insulated by the insulation cotton 15 and the insulation shell 16, and the temperature of the exhaust smoke can be detected by the temperature detector 18, so that the flue gas can be discharged from the left or right side of the control valve 17 after detection.

[0027] A heat exchanger 21 is fixedly installed on one side of the circulation pipe 14, an air outlet 22 is fixedly installed on one side of the heat exchanger 21, two heat exchange tubes 23 are fixedly installed behind the heat exchanger 21, a water tank 24 is fixedly installed on one side of the heat exchange tubes 23, a water inlet 25 is fixedly installed on one side of the top of the water tank 24, and a support frame 2 is fixedly installed on the bottom of the water tank 24.

[0028] Specifically, heat is exchanged through the heat exchanger 21 , and the waste heat in the flue gas can be exchanged through the two heat exchange tubes 23 to heat the water inside the water tank 24 . The water tank 24 can be heated through the water inlet 25 , and the whole is supported by the support frame 2 .

[0029] A connecting pipe 3 is fixedly installed inside the air outlet 22 , and a smoke filtering device 31 is fixedly installed on one side of the connecting pipe 3 .

[0030] A smoke outlet 32 ​​is fixedly mounted on one side of the top of the smoke filter device 31 , and a bottom plate 33 is fixedly mounted on the bottom of the smoke filter device 31 .

[0031] Two bottom blocks 34 are fixedly mounted on both sides of the bottom of the bottom plate 33 , and the bottom blocks 34 are trapezoidal in shape.

[0032] Specifically, the smoke is sent into the smoke filter device 31 through the connecting pipe 3 for filtering, and the filtered smoke can be discharged through the smoke outlet 32. The smoke filter device 31 is supported by the bottom plate 33 and two bottom blocks 34 on both sides of the bottom.

[0033] A smoke outlet device 4 is fixedly installed at the bottom of the air outlet pipe 12 , and a kiln tail smoke chamber 41 is fixedly installed at the bottom of the smoke outlet device 4 .

[0034] A support plate 42 is fixedly installed on the bottom of one side of the kiln tail smoke chamber 41 , and three support seats 44 are fixedly installed on the top of the support plate 42 .

[0035] The rotary kiln 43 is fixedly mounted on the top of the support base 44 .

[0036] Specifically, the rotary kiln 43 is supported by the support seat 44 on the top of the support plate 42, and the smoke generated during combustion is sent into the interior of the kiln tail smoke chamber 41 through the rotary kiln 43, and the smoke inside the kiln tail smoke chamber 41 is sent into the interior of the exhaust pipe 12 through the smoke exhaust device 4.

[0037] Working principle: First, the rotary kiln 43 is supported by the support seat 44 on the top of the support plate 42, and the material is sintered by the rotary kiln 43. The flue gas generated during sintering enters the interior of the kiln tail smoke chamber 41, and the flue gas inside the kiln tail smoke chamber 41 is sent from the exhaust pipe 12 to the interior of the merging valve 11 through the smoke outlet device 4 on the top of the kiln tail smoke chamber 41. The temperature of the flue gas inside the exhaust pipe 12 is detected by the temperature detector 13, so as to facilitate understanding the heat exchange effect of the waste heat recovery boiler 1, and the flue gas is sent to the interior of the waste heat recovery boiler 1 through the merging valve 11 for waste heat recovery. The temperature of the flue gas discharged from the waste heat recovery boiler 1 can be detected by the temperature detector 18. When the flue gas temperature is too high, the flue gas is sent from the left side of the control valve 17 to the interior of the circulation pipe 14 through the control valve 17, and the flue gas is sent to the merging valve 11 through the circulation pipe 14. The flue gas inside the valve 11 and the flue gas inside the exhaust pipe 12 are combined and sent to the waste heat recovery boiler 1 for secondary heat exchange, so as to make full use of the heat in the flue gas, improve the cooling effect and energy recovery effect of the flue gas cooling structure at the kiln tail, and insulate the circulation pipe 14 through the insulation cotton 15 and the insulation shell 16 to avoid the loss of flue gas heat. When the temperature detector 18 detects that the temperature is insufficient, the flue gas is sent to the inside of the circulation pipe 14 on the right side of the control valve 17 through the control valve 17, and the flue gas is sent to the inside of the heat exchanger 21 to exchange the residual waste heat of the flue gas again, thereby improving the cooling effect of the flue gas cooling structure at the kiln tail and increasing energy recovery. The heat of the flue gas is used to heat the water inside the water tank 24 through the heat exchange pipe 23, and the flue gas after heat exchange enters the flue gas filter device 31 for filtration and then discharged.

[0038] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art may still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A kiln tail flue gas cooling structure, characterized in that: The kiln tail flue gas cooling structure comprises a waste heat recovery boiler (1), a merging valve (11) is fixedly installed on the left side of the top of the waste heat recovery boiler (1), an air outlet pipe (12) is fixedly installed inside the left side of the merging valve (11), a temperature detector (13) is fixedly installed in the middle of the air outlet pipe (12), a circulation pipe (14) is fixedly installed on the right side of the inside of the merging valve (11), a heat insulation cotton (15) is fixedly installed on the outside of the circulation pipe (14), a heat insulation shell (16) is fixedly installed on the outside of the heat insulation cotton (15), and the circulation pipe (14) is fixedly installed on the right side of the inside of the merging valve (11). A control valve (17) is fixedly installed in the middle, a temperature detector (18) is fixedly installed at the bottom of the control valve (17), a heat exchanger (21) is fixedly installed on one side of the circulation pipe (14), an air outlet (22) is fixedly installed on one side of the heat exchanger (21), two heat exchange tubes (23) are fixedly installed behind the heat exchanger (21), a water tank (24) is fixedly installed on one side of the heat exchange tube (23), a water inlet (25) is fixedly installed on one side of the top of the water tank (24), and a support frame (2) is fixedly installed on the bottom of the water tank (24).

2. A kiln tail flue gas cooling structure according to claim 1, characterized in that: A connecting pipe (3) is fixedly installed inside the air outlet (22), and a smoke filtering device (31) is fixedly installed on one side of the connecting pipe (3).

3. A kiln tail flue gas cooling structure according to claim 2, characterized in that: A smoke outlet (32) is fixedly mounted on one side of the top of the smoke filter device (31), and a bottom plate (33) is fixedly mounted on the bottom of the smoke filter device (31).

4. A kiln tail flue gas cooling structure according to claim 3, characterized in that: Two bottom blocks (34) are fixedly mounted on both sides of the bottom of the bottom plate (33), and the bottom blocks (34) are in a trapezoidal shape.

5. The kiln tail flue gas cooling structure according to claim 1, characterized in that: A smoke outlet device (4) is fixedly mounted on the bottom of the air outlet pipe (12), and a kiln tail smoke chamber (41) is fixedly mounted on the bottom of the smoke outlet device (4).

6. A kiln tail flue gas cooling structure according to claim 5, characterized in that: A support plate (42) is fixedly mounted on the bottom of one side of the kiln tail smoke chamber (41), and three support seats (44) are fixedly mounted on the top of the support plate (42).

7. A kiln tail flue gas cooling structure according to claim 6, characterized in that: A rotary kiln (43) is fixedly mounted on the top of the support seat (44).

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