SCR (Selective Catalytic Reduction) heating starting device

Abstract

The utility model relates to the technical field of calcining furnaces, in particular to an SCR (Selective Catalytic Reduction) heating starting device which comprises a main flue, a first thermocouple is arranged at one end of the main flue, a first electric heater is arranged in the main flue, an SCR smoke dust treatment device is connected to a pipeline at the tail end of the main flue, and a second electric heater is arranged in the main flue. A top pipeline of the SCR smoke dust treatment equipment is connected with a chimney; the front end, close to the SCR smoke dust treatment equipment, of the main flue is connected with a standby flue through a pipeline. The flue gas temperature control device has the advantages that the flue gas temperature is lower than 280 DEG C during starting and stopping of the calcining furnace, the first thermocouple can detect the temperature of the flue gas in the input end of the main flue, when the temperature is lower than 280 DEG C, the controller starts the first electric heater to raise the temperature of the flue dust in the main flue, and when the temperature of the flue gas passing through the first electric heater is higher than 280 DEG C, the flue gas is heated. The SCR smoke dust treatment equipment can be normally started, and the situation that the SCR smoke dust treatment equipment cannot be started due to the fact that the temperature of smoke in the main flue is too low is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of calcining furnaces, in particular to an SCR heating start-up device. Background Art

[0002] A calcining furnace is a thermal equipment for heat-treating carbon raw materials at high temperatures to improve the properties of the raw materials. It is used in equipment for iron smelting, rare metal recovery, catalyst production, environmental improvement, and production of special chemical products. The flue gas generated by the calcining furnace is treated to remove nitrogen oxides through an SCR flue dust treatment device.

[0003] Normally, the SCR flue dust treatment device needs to be started when the flue gas temperature reaches 280 degrees. However, during the start-up and shutdown of the calcining furnace, the flue gas temperature will be lower than 280 degrees, and the SCR flue dust treatment device cannot be started during this period, directly resulting in the over-standard of the online data of nitrogen oxides. Content of the Utility Model

[0004] The purpose of the utility model aims to solve at least one of the technical defects.

[0005] The purpose of the utility model is to overcome the shortcomings of the prior art, solve the problems mentioned in the background art, and provide an SCR heating start-up device.

[0006] The purpose of the utility model is achieved through the following technical solutions: An SCR heating start-up device includes a main flue. One end of the main flue is provided with a first thermocouple. A first electric heater is arranged inside the main flue. The tail end of the main flue is connected to an SCR flue dust treatment device through a pipeline. The top of the SCR flue dust treatment device is connected to a chimney through a pipeline.

[0007] A standby flue is connected to the front end of the main flue close to the SCR flue dust treatment device. First valves are arranged at both the left and right ends of the standby flue. A second valve is arranged on one side of the main flue close to the first valve. A second thermocouple is arranged at the front end of the main flue close to the standby flue. A second electric heater is arranged inside the standby flue.

[0008] Preferably, the first electric heater is located at the middle position between the first thermocouple and the second thermocouple, and the first thermocouple is located at the input end of the main flue.

[0009] By adopting the above technical solutions, the first thermocouple can detect the flue gas temperature at the front end of the main flue close to the first electric heater, and the second thermocouple can detect the flue gas temperature at the rear end of the main flue close to the first electric heater.

[0010] Preferably, the SCR flue dust treatment device is connected to the output end of the main flue through a pipeline, and the bottom end of the chimney is connected to the output end of the SCR flue dust treatment device through a pipeline.

[0011] By adopting the above technical solution, the SCR flue gas treatment equipment can inject ammonia into the flue gas in the main flue to remove nitrogen oxides.

[0012] Preferably, both the left and right ends of the standby flue are connected to the main flue, and the second electric heater is located at the center of the standby flue.

[0013] By adopting the above technical solution, the second electric heater in the standby flue can be used as a backup when the first electric heater fails.

[0014] Preferably, the number of the first valves is two. The front first valve is located at the input end of the standby flue close to the second electric heater, and the rear first valve is located at the output end of the standby flue close to the second electric heater.

[0015] Preferably, the number of the second valves is two. The front second valve is located on the right side of the main flue close to the front first valve, and the rear second valve is located on the left side of the main flue close to the rear first valve.

[0016] By adopting the above technical solution, the two groups of valves can control the path of the flue gas passing through by the controller.

[0017] Compared with the prior art, the present utility model has the following advantages:

[0018] 1. For the SCR heating start-up device, by setting the first electric heater, a first thermocouple is arranged at one end of the main flue, the first electric heater is arranged inside the main flue, and the tail-end pipeline of the main flue is connected to the SCR flue gas treatment equipment. During the start-up and shutdown of the calciner, the flue gas temperature will be lower than 280 degrees. The first thermocouple can detect the temperature of the flue gas inside the input end of the main flue. When the temperature is lower than 280 degrees, the controller starts the first electric heater to increase the temperature of the soot in the main flue. The temperature of the flue gas after passing through the first electric heater is greater than 280 degrees, and the SCR flue gas treatment equipment can be normally started, avoiding the situation that the SCR flue gas treatment equipment cannot be started due to the too low temperature of the flue gas in the main flue.

[0019] 2. For the SCR heating start-up device, by setting the standby flue, the front end pipeline of the main flue close to the SCR flue gas treatment equipment is connected to the standby flue, and the second electric heater is arranged inside the standby flue. When the first electric heater fails and the second thermocouple detects that the temperature of the flue gas in the main flue is lower than 280 degrees, the controller controls the two second valves to close, and at the same time opens the two first valves, so that the flue gas changes the route and passes through the standby flue. The controller starts the second electric heater to increase the temperature of the flue gas in the standby flue. The setting of the standby flue can avoid the situation that the normal exhaust of the calciner is affected due to the failure of the first electric heater. Description of the Drawings

[0020] Figure 1 is a schematic structural diagram of the present utility model;

[0021] Figure 2 is a schematic structural diagram of the spare flue of the present utility model;

[0022] Figure 3 is a schematic working principle diagram of the present utility model.

[0023] In the figure: 1 - main flue, 2 - first thermocouple, 3 - first electric heater, 4 - SCR soot treatment equipment, 5 - chimney, 6 - spare flue, 7 - first valve, 8 - second valve, 9 - second thermocouple, 10 - second electric heater. Specific implementation manners

[0024] Additional aspects and advantages of the present utility model will be further given in the following description in conjunction with the drawings, and some will become obvious from the following description, or will be understood through the practice of the present utility model.

[0025] As Figure 1 and Figure 3 shown, an SCR heating start-up device includes a main flue 1, a first thermocouple 2 is installed at one end of the main flue 1, a first electric heater 3 is installed inside the main flue 1, the tail end of the main flue 1 is connected to an SCR soot treatment equipment 4 through a pipeline, and the top of the SCR soot treatment equipment 4 is connected to a chimney 5 through a pipeline.

[0026] Through the above settings, during the start-up and shutdown of the calciner, the flue gas temperature will be lower than 280 degrees. The first thermocouple 2 can detect the temperature of the flue gas inside the input end of the main flue 1. When the temperature is lower than 280 degrees, the controller starts the first electric heater 3 to increase the temperature of the soot in the main flue 1. The temperature of the flue gas after passing through the first electric heater 3 is greater than 280 degrees, and the SCR soot treatment equipment 4 can be normally started, avoiding the situation that the SCR soot treatment equipment 4 cannot be started due to the too low temperature of the flue gas inside the main flue 1;

[0027] As Figures 1-3 shown, a spare flue 6 is connected to the front end of the main flue 1 close to the SCR soot treatment equipment 4 through a pipeline. First valves 7 are installed at both the left and right ends of the spare flue 6. A second valve 8 is installed on one side of the main flue 1 close to the first valve 7. A second thermocouple 9 is installed at the front end of the main flue 1 close to the spare flue 6. A second electric heater 10 is installed inside the spare flue 6;

[0028] With the above settings, when the first electric heater 3 malfunctions and the second thermocouple 9 detects that the flue gas temperature in the main flue 1 is lower than 280 degrees, the controller controls the two second valves 8 to close, and at the same time opens the two first valves 7, so that the flue gas changes its route to pass through the standby flue 6. The controller starts the second electric heater 10 to increase the temperature of the flue gas in the standby flue 6. The setting of the standby flue 6 can avoid the situation that the normal exhaust of the calciner is affected due to the malfunction of the first electric heater 3;

[0029] As a preferred technical solution of the present utility model, the first electric heater 3 is located in the middle position between the first thermocouple 2 and the second thermocouple 9, and the first thermocouple 2 is located at the input end of the main flue 1.

[0030] As a preferred technical solution of the present utility model, the SCR dust treatment device 4 is connected to the output end of the main flue 1 through a pipeline, and the bottom end of the chimney 5 is connected to the output end of the SCR dust treatment device 4 through a pipeline.

[0031] As a preferred technical solution of the present utility model, both the left and right ends of the standby flue 6 are connected to the main flue 1, and the second electric heater 10 is located at the center of the standby flue 6.

[0032] As a preferred technical solution of the present utility model, the number of the first valves 7 is two. The front first valve 7 is located at the input end of the standby flue 6 close to the second electric heater 10, and the rear first valve 7 is located at the output end of the standby flue 6 close to the second electric heater 10.

[0033] As a preferred technical solution of the present utility model, the number of the second valves 8 is two. The front second valve 8 is located on the right side of the main flue 1 close to the front first valve 7, and the rear second valve 8 is located on the left side of the main flue 1 close to the rear first valve 7.

[0034] The working process of the present utility model is as follows:

[0035] S1. The first thermocouple 2 can detect the temperature of the flue gas in the input end of the main flue 1;

[0036] S2. When the temperature is lower than 280 degrees, the controller starts the first electric heater 3 to increase the temperature of the dust in the main flue 1;

[0037] S3. When the first electric heater 3 malfunctions and the second thermocouple 9 detects that the flue gas temperature in the main flue 1 is lower than 280 degrees, the controller controls the two second valves 8 to close, and at the same time opens the two first valves 7, so that the flue gas changes its route to pass through the standby flue 6;

[0038] S4. The controller starts the second electric heater 10 to increase the temperature of the flue gas in the standby flue 6.

[0039] Although embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.

Claims

1. An SCR heating start device, characterized in that: The invention comprises a main flue (1), wherein a first thermocouple (2) is arranged at one end of the main flue (1), a first electric heater (3) is arranged inside the main flue (1), a tail end pipe of the main flue (1) is connected to an SCR smoke treatment device (4), and a top pipe of the SCR smoke treatment device (4) is connected to a chimney (5); The front end pipeline of the main flue (1) close to the SCR smoke treatment device (4) is connected to a spare flue (6); first valves (7) are arranged at both left and right ends of the spare flue (6); a second valve (8) is arranged on one side of the main flue (1) close to the first valve (7); a second thermocouple (9) is arranged at the front end of the main flue (1) close to the spare flue (6); and a second electric heater (10) is arranged inside the spare flue (6).

2. The SCR heating start device according to claim 1, characterized in that: The first electric heater (3) is located in the middle of the first thermocouple (2) and the second thermocouple (9), and the first thermocouple (2) is located at the input end of the main flue (1).

3. The SCR heating start device according to claim 1, characterized in that: The SCR smoke treatment device (4) is connected to the output end pipeline of the main flue (1), and the bottom end of the chimney (5) is connected to the output end pipeline of the SCR smoke treatment device (4).

4. The SCR heating start device according to claim 1, characterized in that: The left and right ends of the standby flue (6) are both connected to the main flue (1), and the second electric heater (10) is located at the center of the standby flue (6).

5. The SCR heating start device according to claim 1, characterized in that: The number of the first valves (7) is two. The first valve (7) on the front side is located at the input end of the spare flue (6) close to the second electric heater (10), and the first valve (7) on the rear side is located at the output end of the spare flue (6) close to the second electric heater (10).

6. The SCR heating start device according to claim 5, characterized in that: The number of the second valves (8) is two. The second valve (8) on the front side is located on the right side of the main flue (1) close to the first valve (7) on the front side, and the second valve (8) on the rear side is located on the left side of the main flue (1) close to the first valve (7) on the rear side.

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