Automatic waste gas desulfurization and denitrification system for isostatic graphite production

Abstract

This utility model discloses an automatic desulfurization and denitrification system for waste gas from isostatic graphite production. It includes: a waste gas inlet pipe, a waste gas outlet pipe, a desulfurization tower, a denitrification tower, a sulfur content analyzer, and a nitrate / nitrogen analyzer. The inlet of the denitrification tower is connected to the waste gas inlet pipe. A first pipe is installed between the outlet of the denitrification tower and the inlet of the desulfurization tower. A second pipe is installed between one side of the first pipe and the inlet of the nitrate / nitrogen analyzer. A third pipe is installed between the outlet of the nitrate / nitrogen analyzer and one side of the waste gas inlet pipe. The waste gas outlet pipe is connected to the outlet of the desulfurization tower. A fourth pipe is installed between one side of the waste gas outlet pipe and the inlet of the sulfur content analyzer. A fifth pipe is installed between the outlet of the sulfur content analyzer and one side of the first pipe. This automatic desulfurization and denitrification system for waste gas from isostatic graphite production achieves desulfurization and denitrification treatment and automatic online detection of the waste gas.

Description

Technical Field

[0001] This utility model relates to the field of isostatic graphite production technology, and in particular to an automatic desulfurization and denitrification system for waste gas in isostatic graphite production. Background Technology

[0002] The production process of isostatic graphite requires calcination, and the waste gas generated during the calcination process contains a variety of components that pollute the air environment, such as sulfur dioxide and nitrogen oxides, which need to be desulfurized and denitrified.

[0003] Desulfurization and denitrification of waste gas can be achieved using desulfurization towers and denitrification towers, but the waste gas treatment process cannot be automatically detected and controlled. Often, only sampling and inspection can be carried out, which is relatively lagging. This results in incomplete desulfurization and denitrification of waste gas being emitted into the air, and improvements are needed. Utility Model Content

[0004] The purpose of this invention is to provide an automatic desulfurization and denitrification system for waste gas in isostatic graphite production, which performs desulfurization and denitrification treatment and online monitoring of waste gas, avoiding the problem of incomplete desulfurization and denitrification of waste gas being emitted into the air.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] An automatic desulfurization and denitrification system for waste gas in isostatic graphite production includes: a waste gas inlet pipe, a waste gas outlet pipe, a desulfurization tower, a denitrification tower, a sulfur content analyzer, and a nitrate nitrogen analyzer. The inlet of the denitrification tower is connected to the waste gas inlet pipe. A first pipe is provided between the outlet of the denitrification tower and the inlet of the desulfurization tower. A second pipe is provided between one side of the first pipe and the inlet of the nitrate nitrogen analyzer. A third pipe is provided between the outlet of the nitrate nitrogen analyzer and one side of the waste gas inlet pipe. The waste gas outlet pipe is connected to the outlet of the desulfurization tower. A fourth pipe is provided between one side of the waste gas outlet pipe and the inlet of the sulfur content analyzer. A fifth pipe is provided between the outlet of the sulfur content analyzer and one side of the first pipe.

[0007] The exhaust gas inlet pipe is equipped with a first fan.

[0008] The first pipeline is equipped with a first electric valve.

[0009] The second pipeline is equipped with a first check valve and a second fan.

[0010] The fourth pipeline is equipped with a second one-way valve and a third fan.

[0011] A second electric valve is installed on the exhaust gas output pipe.

[0012] The beneficial effects of this utility model are as follows: An automatic desulfurization and denitrification system for waste gas in isostatic graphite production involves the waste gas first entering a denitrification tower for denitrification treatment. After the waste gas output from the denitrification tower passes the test by a nitrogen and nitrate detector, the first electric valve is opened, allowing the waste gas to continue entering the desulfurization tower for desulfurization treatment. The waste gas output from the desulfurization tower is then tested online by a sulfur content analyzer. After passing the test, the second electric valve is opened to output the waste gas. This system achieves desulfurization and denitrification treatment and automatic online detection of the waste gas, avoiding the problem of incomplete desulfurization and denitrification waste gas being emitted into the air, and improving the automation level of waste gas treatment in the isostatic graphite production process. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model. Detailed Implementation

[0014] The following is combined Figure 1 The technical solution of this utility model will be further illustrated through specific embodiments.

[0015] like Figure 1 The automatic desulfurization and denitrification system for waste gas from isostatic graphite production shown includes: waste gas inlet pipe 5, waste gas outlet pipe 13, desulfurization tower 2, denitrification tower 1, sulfur content analyzer 4, and nitrate and nitrogen analyzer 3. The inlet of the denitrification tower 2 is connected to the waste gas inlet pipe 5. A first fan 6 is installed on the waste gas inlet pipe 5. The waste gas generated during the isostatic graphite production process is sent to the denitrification tower 2 by the first fan 6 for denitrification treatment.

[0016] A first pipe 10 is installed between the outlet of the denitrification tower 1 and the inlet of the desulfurization tower 2. A second pipe 8 is installed between one side of the first pipe 10 and the inlet of the nitrogen-nitrate detector 3. The exhaust gas output from the denitrification tower 1 is monitored online by the nitrogen-nitrate detector 3. A first electric valve 12 is installed on the first pipe 10. The first electric valve 12 and the nitrogen-nitrate detector 3 are respectively connected to a controller. After the detection data of the nitrogen-nitrate detector 3 is qualified, the controller opens the first electric valve 12, allowing the exhaust gas to continue to enter the desulfurization tower 2 for desulfurization treatment.

[0017] A third pipe 7 is provided between the outlet of the nitrogen and nitrate detector 3 and one side of the exhaust gas input pipe 5. The exhaust gas after nitrogen and nitrate detection returns to the exhaust gas input pipe 5 for secondary denitrification treatment, so as to avoid the exhaust gas with incomplete denitrification flowing to the subsequent process.

[0018] In this embodiment, a first one-way valve 11 and a second fan 9 are provided on the second pipe 8. The first one-way valve 11 prevents the waste gas in the waste gas input pipe 5 from entering the third pipe 7 and the second pipe 8, and prevents the waste gas from flowing to the subsequent process without treatment.

[0019] The exhaust gas outlet pipe 13 is connected to the outlet of the desulfurization tower 2. In this embodiment, a second electric valve 14 is installed on the exhaust gas outlet pipe 13. The second electric valve 14 is connected to a controller. When the controller opens the second electric valve 14, the desulfurized exhaust gas is discharged through the exhaust gas outlet pipe 13. The exhaust gas outlet pipe 13 can be connected to other exhaust gas treatment equipment for further treatment of the exhaust gas.

[0020] A fourth pipe 16 is provided between one side of the exhaust gas output pipe 13 and the air inlet of the sulfur content analyzer 4. After the exhaust gas is desulfurized by the desulfurization tower 2, it is sampled online through the fourth pipe 16 and tested by the sulfur content analyzer 4. The sulfur content analyzer 4 is connected to the controller to send the test data. If the test fails, the controller closes the second electric valve 14 and adjusts the control parameters of the desulfurization tower 2 to increase the desulfurization intensity.

[0021] A fifth pipe 18 is provided between the outlet of the sulfur content analyzer 4 and one side of the first pipe 10. The exhaust gas returns to the first pipe 10 through the fourth pipe 16 and the fifth pipe 18, and undergoes secondary desulfurization treatment through the desulfurization tower 2 until it passes the test and then the second electric valve 14 is opened.

[0022] like Figure 1 As shown, the first electric valve 12 is located between two pipe joints on the first pipe 10 that correspond one-to-one with the second pipe 8 and the fifth pipe 18, and they do not affect each other. The fourth pipe 16 is equipped with a second one-way valve 15 and a third fan 17. The second one-way valve 15 prevents the exhaust gas from sequentially passing through the first pipe 10, the fifth pipe 18 and the fourth pipe 16 into the exhaust gas output pipe 13, ensuring that the exhaust gas output from the first pipe 10 is desulfurized through the desulfurization tower 2.

[0023] During normal operation, the controller intermittently turns on the second fan 9 and the third fan 17 to send the exhaust gas into the nitrate nitrogen detector 3 and the sulfur content analyzer 4 for online detection, thereby improving the automation level of the system.

[0024] The above description is only a preferred embodiment of this utility model. For those skilled in the art, there will be changes in the specific implementation method and application scope based on the idea of ​​this utility model. The content of this specification should not be construed as a limitation of this utility model.

Claims

1. An automatic desulfurization and denitrification system for waste gas from isostatic graphite production, characterized in that, include: The system includes an exhaust gas inlet pipe, an exhaust gas outlet pipe, a desulfurization tower, a denitrification tower, a sulfur content analyzer, and a nitrate nitrogen analyzer. The inlet of the denitrification tower is connected to the exhaust gas inlet pipe. A first pipe is installed between the outlet of the denitrification tower and the inlet of the desulfurization tower. A second pipe is installed between one side of the first pipe and the inlet of the nitrate nitrogen analyzer. A third pipe is installed between the outlet of the nitrate nitrogen analyzer and one side of the exhaust gas inlet pipe. The exhaust gas outlet pipe is connected to the outlet of the desulfurization tower. A fourth pipe is installed between one side of the exhaust gas outlet pipe and the inlet of the sulfur content analyzer. A fifth pipe is installed between the outlet of the sulfur content analyzer and one side of the first pipe.

2. The automatic desulfurization and denitrification system for waste gas in isostatic graphite production according to claim 1, characterized in that, A first fan is installed on the exhaust gas inlet pipe.

3. The automatic desulfurization and denitrification system for waste gas in isostatic graphite production according to claim 1, characterized in that, A first electric valve is installed on the first pipeline.

4. The automatic desulfurization and denitrification system for waste gas in isostatic graphite production according to claim 1, characterized in that, The second pipeline is equipped with a first check valve and a second fan.

5. The automatic desulfurization and denitrification system for waste gas in isostatic graphite production according to claim 1, characterized in that, The fourth pipeline is equipped with a second one-way valve and a third fan.

6. The automatic desulfurization and denitrification system for waste gas in isostatic graphite production according to claim 1, characterized in that, A second electric valve is installed on the exhaust gas output pipe.

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