Waste heat recovery and dust removal quenching device for high temperature flue gas pipeline

Abstract

The utility model discloses a high-temperature flue gas pipeline waste heat recovery dust removal quenching device, including a waste heat boiler, the inlet end of the waste heat boiler is connected to a first water seal tank through an inlet pipe, the first water seal tank is connected to a flue gas pipeline through a first connecting pipe, the flue gas pipeline is also connected to a backup system, the outlet end of the waste heat boiler is connected to the backup system through an outlet pipe, the end of the backup system away from the waste heat boiler is connected to a dust removal tower, and the backup system is also connected to a quenching mechanism. When the waste heat boiler is in an emergency maintenance state, the high-temperature flue gas passes through the spare pipeline of the waste heat boiler and the flue gas water seal tank, and before entering the dust removal tower, the high-temperature flue gas is first cooled by a quenching mechanism to reduce the flue gas temperature to a range that the dust removal equipment system can withstand, which completely solves the problem of unplanned shutdown of production enterprises caused by failures in the high-temperature flue gas waste heat system, greatly reduces the operating costs of production enterprises, and ensures safe, stable, and long-term efficient operation of the device.

Description

Technical Field

[0001] The utility model belongs to the technical field of chemical flue gas treatment equipment, and in particular relates to a high-temperature flue gas pipeline waste heat recovery, dust removal and rapid cooling device. Background Art

[0002] As the national environmental protection situation becomes increasingly severe, the environmental protection treatment devices supporting various chemical enterprises such as coal, oil, gas and salt have achieved leapfrog development. In the high-temperature flue gas emission system, in order to further recover the heat carried by the high-temperature flue gas and reduce harmful components such as catalyst dust in the flue gas, and ensure that the flue gas can meet the emission standards, the waste heat boiler and dust removal tower system have become the most critical waste heat recovery and dust removal purification equipment system.

[0003] When the waste heat boiler is in emergency maintenance, the high-temperature flue gas is initially cooled down and then enters the high-position cement chimney or dust removal system before being discharged into the atmosphere. However, since the high-temperature flue gas of various coal, oil, gas, salt and other production enterprises contains a large amount of harmful components, if it is directly discharged into the atmosphere, it does not meet the national safety and environmental protection standards, so the high-temperature flue gas is not allowed to be directly discharged into the atmosphere through the high-temperature cement chimney; if the high-temperature (≥600℃) flue gas that has not been heated by the waste heat boiler is directly entered into the dust removal tower system, it will cause serious damage to the dust removal system equipment. Therefore, when the waste heat recovery equipment of high-temperature flue gas emission of various coal, oil, gas, salt and other production enterprises has an emergency failure and needs to be repaired, it will seriously affect the "safe, stable, long, full, and excellent" efficient operation of the enterprise's safety, environmental protection and energy-saving devices, forcing the enterprise's production equipment to stop working and stop production, causing great losses. Utility Model Content

[0004] The utility model aims to provide a high-temperature flue gas pipeline waste heat recovery dust removal quenching device, which solves the problem in the prior art that the production device stops production when an emergency failure occurs in the waste heat recovery equipment.

[0005] The technical solution adopted by the utility model is a waste heat recovery, dust removal and quenching device for a high-temperature flue gas duct, comprising a waste heat boiler, the inlet end of the waste heat boiler is connected to a first water seal tank via an inlet pipe, the first water seal tank is connected to the flue gas duct via a first connecting pipe, the flue gas duct is also connected to a backup system, the outlet end of the waste heat boiler is connected to the backup system via an outlet pipe, the end of the backup system away from the waste heat boiler is connected to a dust removal tower, and the backup system is also connected to a quenching mechanism.

[0006] The utility model is also characterized in that:

[0007] The backup system includes a flue gas outlet pipe, one end of which is connected to the flue gas duct, the end of the flue gas outlet pipe away from the flue gas duct is connected to the outlet pipe, and the pipe body of the flue gas outlet pipe is connected to a secondary water seal mechanism, which is respectively connected to the quenching mechanism and the dust removal tower.

[0008] The secondary water seal mechanism includes a second water seal tank, the second water seal tank is connected to a second connecting pipe, the end of the second connecting pipe away from the second water seal tank is connected to the pipe body of the flue gas outlet pipe, the second water seal tank is connected to a delivery pipe, the end of the delivery pipe away from the second water seal tank is connected to the dust removal tower, and the quenching mechanism is connected to the pipe body of the delivery pipe.

[0009] The quenching mechanism comprises a desalted water pipe, one end of which is connected to a quenching unit, the quenching unit is connected to a delivery pipe, the pipe body of the desalted water pipe is connected to a compressed air pipe, and the compressed air pipe is arranged close to the quenching unit.

[0010] The quenching unit includes a plurality of branch pipes evenly connected along the circumference of the delivery pipe, the end of each branch pipe away from the delivery pipe is connected to the desalted water pipe, the connection point between the compressed air pipe and the desalted water pipe is arranged close to the connection point between the branch pipe and the desalted water pipe, each branch pipe is connected to a quenching nozzle, and the quenching nozzle is arranged in the delivery pipe.

[0011] The body of the desalted water pipe is connected with three first control valves and one second control valve in sequence from bottom to top. The second control valve is arranged near the connection point between the desalted water pipe and the compressed air pipe. The body of the compressed air pipe is connected with an air valve. The body of the desalted water pipe is connected with a spare pipe. The three first control valves are arranged between the two connection points of the spare pipe and the desalted water pipe. The body of the spare pipe is connected with a spare valve.

[0012] The body of the inlet pipe is connected to a flue butterfly valve, the body of the first connecting pipe is connected to a first ball valve, the body of the smoke duct is connected to a smoke control valve, the smoke control valve is arranged between a connection point between the smoke duct and the first connecting pipe and a connection point between the smoke duct and the smoke outlet pipe, the body of the smoke outlet pipe is connected to two smoke outlet control valves, the connection point between the smoke outlet pipe and the second connecting pipe is arranged between the two smoke outlet control valves, the body of the second connecting pipe is connected to a second ball valve, and the second ball valve is arranged close to the second water seal tank.

[0013] The pipe body of the delivery pipe is connected with a delivery valve, and the delivery valve is arranged between the connection point between the delivery pipe and the second water seal tank and the connection point between the delivery pipe and the branch pipe.

[0014] The beneficial effects of the utility model are:

[0015] The utility model discloses a high-temperature flue gas pipeline waste heat recovery dust removal rapid cooling device. When the waste heat boiler is in an emergency maintenance state, the high-temperature flue gas passes through the spare pipeline of the waste heat boiler and the flue gas water seal tank, and before the high-temperature flue gas enters the dust removal tower, the flue gas temperature is first reduced to a range that the dust removal equipment system can withstand by using a rapid cooling mechanism. This completely solves the problem of unplanned shutdown of production enterprises caused by failures in the high-temperature flue gas waste heat system, greatly reduces the operating costs of production enterprises, and ensures safe, stable, and long-term efficient operation of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the structure of the high-temperature flue gas pipeline waste heat recovery, dust removal and rapid cooling device of the utility model;

[0017] Figure 2 It is a structural schematic diagram of the quenching unit in the high-temperature flue gas duct waste heat recovery and dust removal quenching device of the utility model.

[0018] In the figure: 1. waste heat boiler, 2. first water seal tank, 3. flue gas duct, 31. flue gas control valve, 4. first connecting pipe, 41. first ball valve, 5. dust removal tower, 6. second water seal tank, 7. second connecting pipe, 71. second ball valve, 8. delivery pipe, 81. delivery valve, 9. desalted water pipe, 91. first control valve, 92. second control valve, 93. spare pipe, 931. spare valve, 10. compressed air pipe, 101. air valve, 11. branch pipe, 12. quenching nozzle, 13. inlet pipe, 131. flue gas butterfly valve, 14. outlet pipe, 15. flue gas outlet pipe, 151. flue gas outlet control valve. DETAILED DESCRIPTION

[0019] The utility model is described in detail below with reference to the accompanying drawings and specific implementation modes.

[0020] The utility model is a high-temperature flue gas pipeline waste heat recovery dust removal quenching device, such as Figure 1 As shown, it includes a waste heat boiler 1, the inlet end of the waste heat boiler 1 is connected to the first water seal tank 2 through the inlet pipe 13, the first water seal tank 2 is connected to the flue gas pipeline 3 through the first connecting pipe 4, the flue gas pipeline 3 is also connected to the backup system, the outlet end of the waste heat boiler 1 is connected to the backup system through the outlet pipe 14, the end of the backup system away from the waste heat boiler 1 is connected to the dust removal tower 5, and the backup system is also connected to the quenching mechanism. The backup system serves as a backup pipeline for the waste heat boiler 1. Under normal working conditions, the high-temperature flue gas enters the first water seal tank 2 through the first connecting pipe 4, and then after the waste heat boiler 1 takes heat, the flue gas temperature drops to less than 184°C, and then enters the dust removal tower 5 through the outlet pipe 14 and subsequent pipelines, and is discharged into the atmosphere after dust removal. When the waste heat boiler 1 is urgently overhauled, the flue gas passes through the first water seal tank 2 and the backup system, and then is cooled by the quenching mechanism, and then passes into the dust removal tower 5 for dust removal.

[0021] Example 1

[0022] The backup system includes a flue gas outlet pipe 15, one end of which is connected to the flue gas duct 3, and the end of the flue gas outlet pipe 15 away from the flue gas duct 3 is connected to the outlet pipe 14, and the pipe body of the flue gas outlet pipe 15 is connected with a secondary water seal mechanism, which is respectively connected to the quenching mechanism and the dust removal tower 5. The flue gas outlet pipe 15 and the subsequent secondary water seal mechanism serve as a backup pipeline for the waste heat boiler 1. When the waste heat boiler 1 needs emergency maintenance, the high-temperature flue gas enters the flue gas outlet pipe 15 from the flue gas duct 3, passes through the secondary water seal mechanism, and is rapidly cooled by the quenching mechanism before being sent to the dust removal tower 5.

[0023] The secondary water seal mechanism includes a second water seal tank 6, the second water seal tank 6 is connected to a second connecting pipe 7, the end of the second connecting pipe 7 away from the second water seal tank 6 is connected to the pipe body of the flue gas outlet pipe 14, the second water seal tank 6 is connected to a delivery pipe 8, the end of the delivery pipe 8 away from the second water seal tank 6 is connected to the dust removal tower 5, and the quenching mechanism is connected to the pipe body of the delivery pipe 8. The second connecting pipe 7 and the delivery pipe 8 serve as the delivery pipes for the flue gas during the normal operation and maintenance of the waste heat boiler 1, and the flue gas is delivered to the dust removal tower 5.

[0024] Example 2

[0025] The quenching mechanism includes a desalted water pipe 9, one end of which is connected to a quenching unit, which is connected to a delivery pipe 8, and a compressed air pipe 10 is connected to the body of the desalted water pipe 9, which is arranged close to the quenching unit. The compressor air passes through the compressed air pipe 10 to send compressed air into the desalted water pipe 9, and the desalted water is atomized by the quenching unit and mixed with the high-temperature flue gas in the flue gas pipe, so that the temperature of the high-temperature flue gas entering the dust removal tower 5 can be effectively reduced.

[0026] like Figure 2 As shown, the quenching unit includes a number of branch pipes 11 evenly connected along the circumference of the delivery pipe 8, and the end of each branch pipe 11 away from the delivery pipe 8 is connected to the desalted water pipe 9. The connection point between the compressed air pipe 10 and the desalted water pipe 9 is arranged close to the connection point between the branch pipe 11 and the desalted water pipe 9. Each branch pipe 11 is connected to a quenching nozzle 12, and the quenching nozzle 12 is arranged in the delivery pipe 8. Desalted water enters each branch pipe 11 under the action of compressed air, and is atomized by the quenching nozzle 12 and mixed with the high-temperature flue gas to achieve the purpose of cooling. A valve is installed on each branch pipe 11. When the quenching nozzle 12 is repaired and replaced, the valve can be closed without affecting the normal operation of the device.

[0027] Example 3

[0028] The pipe body of the desalted water pipe 9 is connected with three first control valves 91 and one second control valve 92 in sequence from bottom to top. The second control valve 92 is arranged near the connection point between the desalted water pipe 9 and the compressed air pipe 10. The pipe body of the compressed air pipe 10 is connected with an air valve 101. The pipe body of the desalted water pipe 9 is connected with a spare pipe 93. The three first control valves 91 are arranged between the spare pipe 93 and the two connection points of the desalted water pipe 9. The pipe body of the spare pipe 93 is connected with a spare valve 931. The second control valve 92 serves as the total control valve of the desalted water. The first control valve 91 in the middle position adjusts the flow rate of the desalted water according to the temperature of the flue gas in the delivery pipe 8. When the first control valve 91 in the middle position is replaced and repaired, the two first control valves 91 in the upper and lower positions are closed, and the spare valve 931 is opened. The desalted water passes through the spare pipe 93, and the air valve 101 serves as a switch to control the compressed air.

[0029] The pipe body of the inlet pipe 13 is connected with a flue butterfly valve 131, the pipe body of the first connecting pipe 4 is connected with a first ball valve 41, the pipe body of the flue gas pipe 3 is connected with a flue gas control valve 31, the flue gas control valve 31 is arranged between the connection point between the flue gas pipe 3 and the first connecting pipe 4 and the connection point between the flue gas pipe 3 and the flue gas outlet pipe 15, the pipe body of the flue gas outlet pipe 15 is connected with two flue gas outlet control valves 151, the connection point between the flue gas outlet pipe 15 and the second connecting pipe 7 is arranged between the two flue gas outlet control valves 151, the pipe body of the second connecting pipe 7 is connected with a second ball valve 71, and the second ball valve 71 is arranged near the second water seal tank 6. The two outlet control valves 151 are opened and closed accordingly according to the operating conditions of the waste heat boiler 1 to ensure that the flue gas can smoothly enter the second connecting pipe 7.

[0030] The pipe body of the delivery pipe 8 is connected with a delivery valve 81 , and the delivery valve 81 is arranged between the connection point between the delivery pipe 8 and the second water seal tank 6 and the connection point between the delivery pipe 8 and the branch pipe 11 .

[0031] The working principle of the utility model high-temperature flue gas pipeline waste heat recovery dust removal quenching device is as follows:

[0032] Under normal operating conditions, the high-temperature flue gas enters the first water seal tank 2 through the first connecting pipe 4, and then takes heat from the waste heat boiler 1. After the flue gas temperature drops to less than 184°C, it enters the second water seal tank 6 through the outlet pipe 14 and the second connecting pipe 7, and then enters the dust removal tower 5 from the delivery pipe 8, and is discharged into the atmosphere after dust removal treatment; when the waste heat boiler 1 is urgently overhauled, the flue gas enters the second water seal tank 6 through the flue gas pipeline 3 and the second connecting pipe 7, and then enters the delivery pipe 8. The compressor air sends the compressed air into the desalted water pipe 9 through the compressed air pipe 10, and the desalted water is pressed into the branch pipe 11. After being atomized by the quenching nozzle 12, it is mixed with the high-temperature flue gas to reduce the temperature of the high-temperature flue gas. The flue gas then enters the dust removal tower 5, and is discharged into the atmosphere after dust removal treatment in the dust removal tower 5.

[0033] The utility model discloses a high-temperature flue gas pipeline waste heat recovery, dust removal and rapid cooling device, which has a simple structure, low investment cost and is extremely convenient for on-site construction. It completely solves the problem of unplanned shutdown of production enterprises caused by failure of the high-temperature flue gas waste heat system, greatly reduces the operating costs of production enterprises, and ensures safe, stable and long-term efficient operation of the device.

Claims

1. High-temperature flue gas pipeline waste heat recovery, dust removal and rapid cooling device, characterized in that: The invention comprises a waste heat boiler (1), wherein the inlet end of the waste heat boiler (1) is connected to a first water seal tank (2) via an inlet pipe (13), the first water seal tank (2) is connected to a flue gas duct (3) via a first connecting pipe (4), the flue gas duct (3) is also connected to a backup system, the outlet end of the waste heat boiler (1) is connected to the backup system via an outlet pipe (14), the end of the backup system away from the waste heat boiler (1) is connected to a dust removal tower (5), and the backup system is also connected to a quenching mechanism.

2. The high-temperature flue gas pipeline waste heat recovery, dust removal and rapid cooling device according to claim 1 is characterized in that: The backup system comprises a smoke outlet pipe (15), one end of which is connected to the smoke duct (3), the end of which is away from the smoke duct (3) is connected to the outlet pipe (14), the pipe body of the smoke outlet pipe (15) is connected to a secondary water seal mechanism, and the secondary water seal mechanism is respectively connected to a quenching mechanism and a dust removal tower (5).

3. The high-temperature flue gas pipeline waste heat recovery, dust removal and rapid cooling device according to claim 2 is characterized in that: The secondary water seal mechanism comprises a second water seal tank (6), the second water seal tank (6) is connected to a second connecting pipe (7), the end of the second connecting pipe (7) away from the second water seal tank (6) is connected to the pipe body of the smoke outlet pipe (15), the second water seal tank (6) is connected to a delivery pipe (8), the end of the delivery pipe (8) away from the second water seal tank (6) is connected to the dust removal tower (5), and the quenching mechanism is connected to the pipe body of the delivery pipe (8).

4. The high-temperature flue gas pipeline waste heat recovery, dust removal and rapid cooling device according to claim 3 is characterized in that: The quenching mechanism comprises a desalted water pipe (9), one end of which is connected to a quenching unit, the quenching unit is connected to a delivery pipe (8), the body of the desalted water pipe (9) is connected to a compressed air pipe (10), and the compressed air pipe (10) is arranged close to the quenching unit.

5. The high-temperature flue gas pipeline waste heat recovery, dust removal and rapid cooling device according to claim 4 is characterized in that: The quenching unit comprises a plurality of branch pipes (11) uniformly connected along the circumference of the delivery pipe (8), the end of each branch pipe (11) away from the delivery pipe (8) is connected to the desalted water pipe (9), the connection point between the compressed air pipe (10) and the desalted water pipe (9) is arranged close to the connection point between the branch pipe (11) and the desalted water pipe (9), and each branch pipe (11) is connected to a quenching nozzle (12), and the quenching nozzle (12) is arranged in the delivery pipe (8).

6. The high-temperature flue gas pipeline waste heat recovery, dust removal and rapid cooling device according to claim 4 is characterized in that: The pipe body of the desalted water pipe (9) is connected to three first control valves (91) and one second control valve (92) in sequence from bottom to top; the second control valve (92) is arranged close to the connection point between the desalted water pipe (9) and the compressed air pipe (10); the pipe body of the compressed air pipe (10) is connected to an air valve (101); the pipe body of the desalted water pipe (9) is connected to a spare pipe (93); the three first control valves (91) are arranged between two connection points between the spare pipe (93) and the desalted water pipe (9); and the pipe body of the spare pipe (93) is connected to a spare valve (931).

7. The high-temperature flue gas pipeline waste heat recovery, dust removal and rapid cooling device according to claim 1 is characterized in that: The pipe body of the inlet pipe (13) is connected to a flue butterfly valve (131), the pipe body of the first connecting pipe (4) is connected to a first ball valve (41), the pipe body of the smoke pipe (3) is connected to a smoke control valve (31), the smoke control valve (31) is arranged between the connection point between the smoke pipe (3) and the first connecting pipe (4) and the connection point between the smoke pipe (3) and the smoke outlet pipe (15), the pipe body of the smoke outlet pipe (15) is connected to two smoke outlet control valves (151), the connection point between the smoke outlet pipe (15) and the second connecting pipe (7) is arranged between the two smoke outlet control valves (151), the pipe body of the second connecting pipe (7) is connected to a second ball valve (71), and the second ball valve (71) is arranged close to the second water seal tank (6).

8. The high-temperature flue gas pipeline waste heat recovery, dust removal and rapid cooling device according to claim 3 is characterized in that: The pipe body of the delivery pipe (8) is connected to a delivery valve (81), and the delivery valve (81) is arranged between a connection point between the delivery pipe (8) and the second water seal tank (6) and a connection point between the delivery pipe (8) and the branch pipe (11).

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