Rotating disc type heat exchanger for ultralow-temperature denitration

Abstract

The utility model discloses a rotating disc type heat exchanger for ultralow-temperature denitration. The rotating disc type heat exchanger comprises a heat exchanger shell, a flue shell, a heat exchange disc, a rotating shaft, a bearing and a driving motor, the flue shell is fixed in the heat exchanger shell, the heat exchange disc is installed in the flue shell, air gaps are reserved between the heat exchange disc and an upper shell plate of the flue shell and between the heat exchange disc and a lower shell plate of the flue shell respectively, a flue gas access pipeline upper connector and a tail gas pipeline upper connector are symmetrically arranged on the flue shell, and the flue gas access pipeline upper connector is connected with the tail gas pipeline upper connector. A flue gas access pipeline lower connector and a tail gas pipeline lower connector are symmetrically arranged on the flue shell lower shell plate; honeycomb-shaped through holes are formed in a disc body of the heat exchange disc, a shaft sleeve is arranged in the middle of the heat exchange disc, the rotating shaft is fixedly installed in the shaft sleeve, bearings are installed at the two ends of the rotating shaft respectively, the bearings are fixed to the heat exchanger shell, and the top end of the rotating shaft penetrates through the bearing at the top and then is connected with the driving motor. Through the mode, the heat exchange efficiency can be obviously improved, and the heat loss of a system is reduced.

Description

Technical Field

[0001] The utility model relates to the field of heat exchangers, in particular to a turntable type heat exchanger for ultra-low temperature denitration. Background Art

[0002] Ultra-low temperature flue gas denitrification technology refers to the use of ammonia water or ammonia gas to remove NO in flue gas under the catalytic conditions of a low temperature range of 120-300℃. x Reduction to nitrogen. In this process, the flue gas entering the denitrification system must first be heated to the reaction temperature before the reaction can continue, and the tail gas after the reaction still has a relatively high temperature. Therefore, in actual practice, a heat exchanger is generally used to connect the tail gas pipeline and the flue gas access pipeline to preheat the flue gas and reduce energy loss during heating. Currently, commonly used heat exchangers generally use water or oil and other media to exchange heat by convection. This convection heat exchange method has a large heat loss and the heat exchange effect is not good when the temperature difference is not large. Utility Model Content

[0003] The main technical problem solved by the utility model is to provide a rotary disc type heat exchanger for ultra-low temperature denitration, which can improve the heat exchange efficiency and reduce the energy consumption of the system.

[0004] In order to solve the above technical problems, a technical solution adopted by the utility model is: to provide a turntable type ultra-low temperature denitrification heat exchanger, the turntable type ultra-low temperature denitrification heat exchanger comprises: a heat exchanger shell, a flue shell, a heat exchanger plate, a rotating shaft, a bearing and a driving motor, the flue shell is fixed in the heat exchanger shell, the heat exchanger plate is installed in the flue shell, an upper air gap is left between the upper surface of the heat exchanger plate and the upper shell plate of the flue shell, a lower air gap is left between the lower surface of the heat exchanger plate and the lower shell plate of the flue shell, and an upper interface and a tail gas inlet pipe are symmetrically arranged on the flue shell. The upper interface of the flue gas duct, the lower interface of the flue gas access duct and the lower interface of the exhaust gas duct are symmetrically arranged on the lower shell plate of the flue shell, the upper interface of the flue gas access duct is directly above the lower interface of the flue gas access duct, and the upper interface of the exhaust gas duct is directly above the lower interface of the exhaust gas duct; the body of the heat exchanger disk is provided with honeycomb through holes, and a shaft sleeve is provided in the middle of the heat exchanger disk, the rotating shaft is fixedly installed in the shaft sleeve, and bearings are respectively installed at both ends of the rotating shaft, and the bearings are fixed on the heat exchanger shell, and the top end of the rotating shaft passes through the top bearing and is connected to the drive motor.

[0005] In a preferred embodiment of the utility model, a cooling circulation system is also connected to the bearing, and a liquid inlet pipe and a liquid outlet pipe of the cooling circulation system are both connected to the bearing at the top end of the rotating shaft.

[0006] In a preferred embodiment of the utility model, the bearings are all connected with dust cleaning air valves.

[0007] In a preferred embodiment of the present invention, the drive motor is connected to a frequency converter control cabinet and a speed monitor, and there are two frequency converter control cabinets.

[0008] In a preferred embodiment of the present invention, the widths of the upper air gap and the lower air gap are both 1 to 3 mm.

[0009] In a preferred embodiment of the present utility model, a semi-telescopic sootblowing gun is installed on the outer side of the heat exchanger shell, the gun body of the semi-telescopic sootblowing gun is connected to a soot cleaning air valve, and the muzzle of the gun abuts against the sootblowing port reserved on the heat exchanger shell. There are two semi-telescopic sootblowing guns, one is an upper sootblowing gun, and the sootblowing port corresponding to the muzzle of the upper sootblowing gun is aligned with the position of the upper air gap, and the other is a lower sootblowing gun, and the sootblowing port corresponding to the muzzle of the lower sootblowing gun is aligned with the position of the lower air gap.

[0010] The beneficial effect of the utility model is that the utility model changes the original fluid convection heat exchange mode into solid circulation conduction heat exchange. On the one hand, the heat exchange plate does not contact the outside, reducing the heat dissipation path. On the other hand, the convection process is reduced, thereby significantly reducing the heat loss during heat exchange, thereby effectively preheating the flue gas and reducing the energy consumption of the system operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a schematic diagram of the overall structure of a preferred embodiment of the utility model;

[0012] Figure 2 is an enlarged schematic diagram of a local structure of the embodiment;

[0013] The markings of the components in the accompanying drawings are as follows:

[0014] 1. Liquid inlet pipe, 2. Liquid outlet pipe, 3. Driving motor, 4. Bearing, 5. Bushing, 6. Rotating shaft, 7. Heat exchange plate, 8. Flue shell, 9. Flue gas access pipe lower interface, 10. Exhaust pipe lower interface, 11. Flue gas access pipe upper interface, 12. Exhaust pipe upper interface, 13. Heat exchange

[0015] 1. Casing, 14. Lower soot blowing gun, 15. Upper soot blowing gun, 16. Soot cleaning air valve;

[0016] 301. First inverter control cabinet, 302. Second inverter control cabinet, 303. Speed ​​monitor 303. DETAILED DESCRIPTION

[0017] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0018] See also Figure 1 and Figure 2 , the utility model embodiment includes:

[0019] A turntable type ultra-low temperature denitrification heat exchanger, the turntable type ultra-low temperature denitrification heat exchanger comprises: a heat exchanger shell 13, a flue shell 8, a heat exchange disk 7, a rotating shaft 6, a bearing 4 and a driving motor 3, the flue shell 8 is fixed in the heat exchanger shell 13, the heat exchange disk 7 is installed in the flue shell 8, an upper air gap is left between the upper surface of the heat exchange disk 7 and the upper shell plate of the flue shell 8, a lower air gap is left between the lower surface of the heat exchange disk 7 and the lower shell plate of the flue shell 8, an upper interface 11 of the flue gas access pipeline and an upper interface 12 of the exhaust pipeline are symmetrically arranged on the upper shell plate of the flue shell 8, the flue shell 8 The lower shell plate of the flue gas access pipe is symmetrically provided with a lower interface 9 for the flue gas access pipe and a lower interface 10 for the exhaust gas pipe, the upper interface 11 for the flue gas access pipe is directly above the lower interface 9 for the flue gas access pipe, and the upper interface 12 for the exhaust gas pipe is directly above the lower interface 10 for the exhaust gas pipe; the body of the heat exchange disk 7 is provided with a honeycomb through hole, a shaft sleeve 5 is provided in the middle of the heat exchange disk 7, the rotating shaft 6 is fixedly installed in the shaft sleeve 5, bearings 4 are respectively installed at both ends of the rotating shaft 6, the bearings 4 are fixed on the heat exchanger shell 13, and the top end of the rotating shaft 6 passes through the top bearing 4 and is connected to the drive motor 3.

[0020] The bearing 4 is also connected to a cooling system, and the liquid inlet pipe 1 and the liquid outlet pipe 2 of the cooling system are both connected from the bearing 4 at the top of the rotating shaft 6. The cooling system can effectively reduce the temperature of the bearing 4 to prevent the bearing 4 from being overheated and unstable or even falling off. The bearing 4 is connected to a dust cleaning valve 16, which can be used to regularly blow and clean the ash on the bearing to prevent the bearing 4 from becoming stuck.

[0021] The drive motor 3 is connected to a frequency converter control cabinet and a speed monitor, and there are two frequency converter control cabinets, namely a first frequency converter control cabinet 301 and a second frequency converter control cabinet 302. In this way, when the rotation of the drive motor 3 is adjusted by the frequency converter control cabinet, the rotation speed can be monitored in real time by the speed monitor 303, and the first frequency converter control cabinet 301 and the second frequency converter control cabinet 302 can be switched for use to prevent one of them from being damaged.

[0022] The width of the upper air gap and the lower air gap is 1-3 mm. If the width of the air gap is too large, the smoke and exhaust gas are easily mixed, resulting in NO in the exhaust gas. x If the air gap width is too small, the passing rate will be too low, affecting the gas movement speed.

[0023] A semi-retractable sootblowing gun is installed on the outside of the heat exchanger housing 13. The gun body of the semi-retractable sootblowing gun is connected to a soot-clearing air valve 16. The gun muzzle abuts against the sootblowing port reserved on the heat exchanger housing 13. There are two semi-retractable sootblowing guns, one is an upper sootblowing gun 15. The sootblowing port corresponding to the gun muzzle of the upper sootblowing gun 15 is aligned with the position of the upper air gap. The other is a lower sootblowing gun 14. The sootblowing port corresponding to the gun muzzle of the lower sootblowing gun 14 is aligned with the position of the lower air gap. In this way, the floating dust between the upper and lower air gaps can be cleared in time to prevent blockage in the middle and affect the airflow.

[0024] The working principle of the utility model is that in actual use, the heat exchange disk 7 rotates continuously, and the heated part of the exhaust gas can be transferred to the smoke passing area by rotation. After heating the smoke, the temperature of the disk drops and then it is transferred back to the exhaust passing area to be reheated by the exhaust gas. In this process, since the smoke passing area and the exhaust passing area pass in opposite directions, and honeycomb through holes are arranged on the heat exchange disk 7, two opposite pressure gradient directions are formed with the main smoke passage composed of the upper interface 11 of the smoke gas access pipe and the lower interface 9 of the smoke gas access pipe as the center and the main exhaust passage composed of the upper interface 12 of the exhaust pipe and the lower interface 10 of the exhaust pipe as the center, driving the smoke and exhaust gas to move in different directions. In this way, not only will there be no mixing problem during the movement of the smoke and exhaust gas, but also since the heat exchange process is completed through the heat exchange disk 7, the heat exchange thread is short and the heat dissipation path is less, so the heat loss is significantly reduced and the overall efficiency is significantly improved.

[0025] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A rotary disc type ultra-low temperature denitrification heat exchanger, characterized in that: The rotary disc type ultra-low temperature denitration heat exchanger comprises: a heat exchanger shell, a flue shell, a heat exchange disc, a rotating shaft, a bearing and a driving motor; The flue shell is fixed in the heat exchanger housing, the heat exchange plate is installed in the flue shell, an upper air gap is left between the upper surface of the heat exchange plate and the upper shell plate of the flue shell, a lower air gap is left between the lower surface of the heat exchange plate and the lower shell plate of the flue shell, an upper interface of the flue gas access pipe and an upper interface of the tail gas pipe are symmetrically arranged on the flue shell, a lower interface of the flue gas access pipe and a lower interface of the tail gas pipe are symmetrically arranged on the lower shell plate of the flue shell, the upper interface of the flue gas access pipe is directly above the lower interface of the flue gas access pipe, and the upper interface of the tail gas pipe is directly above the lower interface of the tail gas pipe; The heat exchange disk body is provided with honeycomb through holes, a shaft sleeve is provided in the middle of the heat exchange disk, the rotating shaft is fixedly installed in the shaft sleeve, bearings are respectively installed at both ends of the rotating shaft, the bearings are fixed on the heat exchanger housing, and the top end of the rotating shaft passes through the top bearing and is connected to the drive motor.

2. The rotary disc type ultra-low temperature denitration heat exchanger according to claim 1, characterized in that: The bearing is also connected to a cooling circulation system, and a liquid inlet pipe and a liquid outlet pipe of the cooling circulation system are both connected to the bearing at the top end of the rotating shaft.

3. The rotary disc type ultra-low temperature denitration heat exchanger according to claim 1, characterized in that: The bearings are all connected with dust cleaning air valves.

4. The rotary disc type ultra-low temperature denitration heat exchanger according to claim 1, characterized in that: The drive motor is connected to a frequency converter control cabinet and a speed monitor, and there are two frequency converter control cabinets.

5. The rotary disc type ultra-low temperature denitration heat exchanger according to claim 1, characterized in that: The widths of the upper air gap and the lower air gap are both 1 to 3 mm.

6. The rotary disc type ultra-low temperature denitration heat exchanger according to claim 1, characterized in that: A semi-retractable sootblowing gun is installed on the outside of the heat exchanger shell. The gun body of the semi-retractable sootblowing gun is connected to a soot cleaning air valve, and the muzzle of the gun abuts against the sootblowing port reserved on the heat exchanger shell. There are two semi-retractable sootblowing guns, one is an upper sootblowing gun, and the sootblowing port corresponding to the muzzle of the upper sootblowing gun is aligned with the position of the upper air gap, and the other is a lower sootblowing gun, and the sootblowing port corresponding to the muzzle of the lower sootblowing gun is aligned with the position of the lower air gap.

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