Electric heater for flue gas denitration

Abstract

The utility model belongs to the technical field of waste gas treatment, and particularly relates to an electric heater for flue gas denitration, which comprises an electric heater body, the left end of the electric heater body is connected with a heating component through a barrel connecting flange, the heating component is connected with an electric control cabinet, and the electric control cabinet is connected with a PLC (programmable logic controller) control device. The heating component comprises a junction box, the right end of the junction box is provided with a heating group, the heating group is sleeved with a connecting flange, the connecting flange is fixedly connected with the barrel connecting flange, and the right end of the heating group extends into the electric heater body; the heating group is connected with a contactor arranged in the electric control cabinet; the electric heater is simple in structure and convenient to use, the automation degree of the electric heater for flue gas denitration is improved to a great extent, the labor cost is saved, the electric heater can regulate and control the temperature according to the real-time temperature of flue gas, the heating efficiency and the temperature control accuracy are improved, meanwhile, the electric power consumption is reduced, and the purposes of saving energy and reducing consumption are achieved.

Description

Technical Field

[0001] This utility model belongs to the field of waste gas treatment technology, specifically relating to an electric heater for flue gas denitrification. Background Technology

[0002] In the treatment of chemical waste gas, electric heaters are used to mix and heat the gases produced by combustion. Electric heaters are an internationally popular type of electric heating equipment used for heating, maintaining, and warming flowing liquid and gaseous media. When the heating medium passes through the heating chamber of the electric heater under pressure, the enormous heat generated by the heating element is uniformly carried away using fluid mechanics principles, ensuring that the temperature of the heated medium meets the user's process requirements.

[0003] Existing electric heaters for flue gas denitrification typically require staff to measure the flue gas temperature periodically and adjust the heater's temperature accordingly. During this process, staff may inhale flue gas, posing a safety hazard. Furthermore, the periodic manual temperature measurement prevents real-time monitoring and temperature adjustment, creating health risks for staff, resulting in low efficiency and high labor costs. To address these shortcomings, a novel electric heater for flue gas denitrification is proposed. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model provides an electric heater for flue gas denitrification, which has a simple structure and is easy to use. It greatly improves the automation level of the electric heater for flue gas denitrification, saves labor costs, and improves heating efficiency.

[0005] The technical solution adopted by this utility model is as follows: an electric heater for flue gas denitrification, comprising an electric heater body, a supporting component at the bottom of the electric heater body, an air inlet component at the right end of the electric heater body with an inlet thermocouple thereon, an air outlet component at the upper left end of the electric heater body with an outlet thermocouple thereon, the left end of the electric heater body being connected to a heating element via a cylinder connecting flange, the heating element being connected to an electrical control cabinet, and the electrical control cabinet being connected to a PLC control device; the heating element includes a junction box, a heating assembly at the right end of the junction box, a connecting flange fitted on the heating assembly, the connecting flange being fixedly connected to the cylinder connecting flange, the right end of the heating assembly... It extends into the interior of the electric heater body; there are 3-6 heating groups, and the electrical control cabinet is equipped with 3-6 contactors. One heating group is connected to one contactor, and the number of heating groups is the same as the number of contactors; the electrical control cabinet is equipped with a frequency controller and a PID controller, and the number of frequency controllers and PID controllers is 1-3 each. One frequency controller is connected to one heating group, and the number of frequency controllers is less than the number of heating groups. One PID controller is connected to one heating group, and the number of PID controllers is less than the number of heating groups. There are internal cavity thermocouples between the heating groups. The inlet thermocouple, outlet thermocouple, and internal cavity thermocouple are connected to the PLC control device.

[0006] The support component includes a support leg that is fixedly connected to the bottom of the electric heater body, and a support plate is connected to the bottom of the support leg.

[0007] The air intake component includes an air intake connecting pipe a, one end of which is connected to the electric heater body and the other end is connected to an inlet flange. The inlet flange is connected to an air intake connecting pipe b, and an inlet thermocouple is installed on the air intake connecting pipe b.

[0008] The gas outlet component includes a gas outlet connecting pipe a, which is located at the upper left end of the electric heater body. One end of the gas outlet connecting pipe a is connected to the electric heater body, and the other end is connected to the outlet flange. The outlet flange is connected to a gas outlet connecting pipe b, and an outlet thermocouple is provided on the gas outlet connecting pipe b.

[0009] The heating unit is fixedly connected to the connecting flange by fasteners.

[0010] The beneficial effects of this utility model are as follows:

[0011] This utility model has a simple and reasonable structure. Through the cooperation of the inlet thermocouple, outlet thermocouple, inner cavity thermocouple and PLC control device, it realizes real-time monitoring of flue gas temperature and the internal temperature of the electric heater body. At the same time, through the cooperation of PLC control device and electrical control cabinet, and the control of contactor, PID controller and frequency controller by electrical control cabinet, it realizes real-time control of heating group. It can adjust temperature in real time according to flue gas temperature and improve the automation level of equipment. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model;

[0013] Figure 2 This is a cross-sectional view of the junction box of this utility model;

[0014] Figure 3 This is a schematic diagram of the connection structure of the various components of this utility model.

[0015] The diagram shows the following components: 1. Electric heater body; 2. Support component, 21. Support leg, 22. Support plate; 3. Air inlet component, 31. Air inlet connecting pipe a, 32. Inlet flange, 33. Air inlet connecting pipe b; 4. Inlet thermocouple; 5. Air outlet component, 51. Air outlet connecting pipe a, 52. Outlet flange, 53. Air outlet connecting pipe b; 6. Outlet thermocouple; 7. Cylinder connecting flange; 8. Heating component, 81. Junction box, 82. Heating group, 83. Connecting flange; 9. Electrical control cabinet; 10. PLC control device; 11. Internal cavity thermocouple. Detailed Implementation

[0016] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings.

[0017] As shown in the figure, an electric heater for flue gas denitrification includes an electric heater body 1. A support component 2 is provided at the bottom of the electric heater body 1. The support component 2 includes a support leg 21 fixedly connected to the bottom of the electric heater body 1, and a support plate 22 is connected to the bottom of the support leg 21. An air inlet component 3 is provided at the right end of the electric heater body 1. The air inlet component 3 includes an air inlet connecting pipe a31. One end of the air inlet connecting pipe a31 is connected to the electric heater body 1, and the other end is connected to an inlet flange 32. The inlet flange 32 is connected to an air inlet connecting pipe b33. 3. An inlet thermocouple 4 is provided on the upper left side of the electric heater body 1; an outlet component 5 is provided on the upper left side of the electric heater body 1, the outlet component 5 includes an outlet connecting pipe a51, the outlet connecting pipe a51 is located at the upper left end of the electric heater body 1, one end of the outlet connecting pipe a51 is connected to the electric heater body 1, and the other end is connected to an outlet flange 52, the outlet flange 52 is connected to an outlet connecting pipe b53, and an outlet thermocouple 6 is provided on the outlet connecting pipe b53; the left end of the electric heater body 1 is connected to the heating component 8 through a cylinder connecting flange 7, and the heating component 8 is connected to the electrical control cabinet 9. The electrical control cabinet 9 is connected to the PLC control device 10; the heating component 8 includes a junction box 81, with a heating group 82 at the right end of the junction box 81. A connecting flange 83 is fitted onto the heating group 82, and the heating group 82 is fixedly connected to the connecting flange 83 by fasteners. The connecting flange 83 is fixedly connected to the cylinder connecting flange 7. The right end of the heating group 82 extends into the electric heater body 1; there are 3-6 heating groups 82, and the electrical control cabinet 9 has 3-6 contactors. One heating group 82 is connected to one contactor. The number of heating groups 82 is related to the number of contactors. The number of contacts is the same; the electrical control cabinet 9 is equipped with a frequency controller and a PID controller, with 1-3 frequency controllers and PID controllers. One frequency controller is connected to one heating group 82, and the number of frequency controllers is less than the number of heating groups 82. One PID controller is connected to one heating group 82, and the number of PID controllers is less than the number of heating groups 82. There are internal cavity thermocouples 11 between the heating groups 82. The inlet thermocouple 4, the outlet thermocouple 6 and the internal cavity thermocouple 11 are connected to the PLC control device 10.

[0018] This type of electric heater for flue gas denitrification has four heating groups 82 within the heating component 8 and four contactors within the electrical control cabinet 9. Each heating group 82 is connected to one contactor. The electrical control cabinet 9 also contains two frequency controllers and two PID controllers. Two of the four heating groups 82 are connected to the two frequency controllers, and the other two are connected to the two PID controllers. The required temperature is set via a PLC control device 10, which transmits a signal to the electrical control cabinet 9, activating the cabinet to heat the heating groups 82 to the set temperature. Gas enters the electric heater body 1 through the inlet component 3, is heated to the required temperature by the heating groups 82 within the heater body 1, and then exits through the outlet component 5 to proceed to the next process. The inlet thermocouple 4, outlet thermocouple 6, and inner cavity thermocouple 11 transmit temperature signals via cables. The PLC control device 10 selects whether to trigger an alarm based on the temperature signals transmitted from the inlet thermocouple 4, outlet thermocouple 6, and inner cavity thermocouple 11. If no alarm is triggered, the PLC control device 10 will not transmit a signal to the electrical control cabinet 9. If an alarm is triggered, the PLC control device 10 transmits the control signal to the electrical control cabinet 9 via a cable. The electrical control cabinet 9 then shuts down the designated heating group 82 via a contactor or adjusts the temperature of the designated heating group 82 within a small range via a frequency controller or PID controller, based on the signal transmitted by the PLC. This utility model has a simple structure and is easy to use. It greatly improves the automation level of the electric heater used for flue gas denitrification, saves labor costs, and enables the electric heater to adjust the temperature according to the real-time temperature of the flue gas, thereby improving heating efficiency and temperature control accuracy. At the same time, it reduces power consumption, achieving the goal of energy saving and consumption reduction.

Claims

1. An electric heater for flue gas denitrification, comprising an electric heater body (1), wherein a support member (2) is provided at the bottom of the electric heater body (1), characterized in that: An air inlet component (3) is provided on the right end of the electric heater body (1), and an inlet thermocouple (4) is provided on the air inlet component (3). An air outlet component (5) is provided on the upper left end of the electric heater body (1), and an outlet thermocouple (6) is provided on the air outlet component (5). The left end of the electric heater body (1) is connected to the heating component (8) through the cylinder connecting flange (7). The heating component (8) is connected to the electrical control cabinet (9), and the electrical control cabinet (9) is connected to the PLC control device (10). The heating component (8) includes a junction box (81), and a heating group (82) is provided on the right end of the junction box (81). A connecting flange (83) is fitted on the heating group (82), and the connecting flange (83) is fixedly connected to the cylinder connecting flange (7). The right end of the heating group (82) extends into the electric heater body (1). There are 3-6 heating groups (82), and 3-6 contactors are provided in the electrical control cabinet (9). One heating group (82) is connected to one contactor. The number of heating groups (82) is the same as the number of contactors. The electrical control cabinet (9) is provided with a frequency controller and a PID controller. The number of frequency controllers and PID controllers is 1-3. One frequency controller is connected to one heating group (82). The number of frequency controllers is less than the number of heating groups (82). One PID controller is connected to one heating group (82). The number of PID controllers is less than the number of heating groups (82). There are internal cavity thermocouples (11) between the heating groups (82). The inlet thermocouple (4), outlet thermocouple (6) and internal cavity thermocouple (11) are connected to the PLC control device (10).

2. The electric heater for flue gas denitrification according to claim 1, characterized in that: The support component (2) includes a support leg (21) fixedly connected to the bottom of the electric heater body (1), and a support plate (22) is connected to the bottom of the support leg (21).

3. The electric heater for flue gas denitrification according to claim 1, characterized in that: The air intake component (3) includes an air intake connection pipe a (31), one end of which is connected to the electric heater body (1), and the other end is connected to the inlet flange (32). The inlet flange (32) is connected to the air intake connection pipe b (33), and an inlet thermocouple (4) is provided on the air intake connection pipe b (33).

4. An electric heater for flue gas denitrification according to claim 1, characterized in that: The gas outlet component (5) includes a gas outlet connecting pipe a (51), which is located at the upper left end of the electric heater body (1). One end of the gas outlet connecting pipe a (51) is connected to the electric heater body (1), and the other end is connected to the outlet flange (52). The outlet flange (52) is connected to the gas outlet connecting pipe b (53), and an outlet thermocouple (6) is provided on the gas outlet connecting pipe b (53).

5. An electric heater for flue gas denitrification according to claim 1, characterized in that: The heating assembly (82) is fixedly connected to the connecting flange (83) by fasteners.

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