High-precision heat tracing pipe for flue gas collection

Abstract

The utility model discloses a high-precision heat tracing pipe for collecting smoke, which relates to the field of heat tracing pipes, and is characterized by comprising an inner pipe for conveying smoke, a heat tracing wire component wound on the outer side wall of the inner pipe, and a heat insulation layer wrapped on the outer side wall of the heat tracing wire component, the heat tracing wire component consists of a plurality of short heat tracing wires, and the heat insulation layer is arranged on the outer side wall of the heat tracing wire component. Each short heat tracing wire is provided with a power supply, the current or voltage of each short heat tracing wire can be independently adjusted through the independent power supply, so that the heat generated by the short heat tracing wires is controlled in a high-precision mode, and the effect is that smoke is transmitted to an analysis instrument from a flue and other sampling points through the inner pipe, and heat tracing is conducted on the smoke through the short heat tracing wires in the process; and each short heat tracing wire is provided with a power supply, and the current or voltage of each short heat tracing wire can be independently adjusted, so that the heat generated by each short heat tracing wire can be controlled in a high-precision manner, and the heat tracing temperature can better meet the actual requirements of each part of the inner pipe.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of heat tracing pipe, more specifically, it relates to a high-precision heat tracing pipe for flue gas collection. BACKGROUND

[0002] When detecting the composition of industrial flue gas, the flue gas needs to be transmitted from the sampling point such as the flue to the analysis instrument. Since the flue gas may contain water vapor and other easily condensed components, and the change of ambient temperature during transmission may cause changes in the composition of the flue gas or condensation, affecting the detection accuracy, a heat tracing pipe is needed to heat the flue gas to ensure that the flue gas remains gaseous and stable in composition during transmission.

[0003] However, the existing heat tracing pipe mostly adopts a single long heat tracing wire design, which has obvious drawbacks. Due to its length, it cannot guarantee the heat demand of each part during the entire heating process. On the one hand, after power supply, due to the uneven distribution of its own resistance and the tightness of its contact with the inner tube, the heat generated at different positions will be different. For example, at the position where the heat tracing wire is not tightly attached to the inner tube, the heat transfer efficiency is reduced, and heat accumulates, while other parts may lack heat. On the other hand, relying solely on a single long heat tracing wire cannot flexibly adjust the heat supply according to the specific needs of different areas of the inner tube. For example, in areas where the flue gas flow changes greatly or the local heat dissipation conditions of the inner tube are special, it is not possible to accurately increase or decrease the heating power of the heat tracing wire at that position, thus not achieving high-precision temperature control, ultimately leading to uneven heating of the entire heat tracing pipe, affecting the accuracy and stability of flue gas collection, and also not conducive to the effective implementation of subsequent composition analysis and related processing work of flue gas.

[0004] Therefore, in order to solve the above technical problems, the present application proposes a high-precision heat tracing pipe for flue gas collection. Utility model content

[0005] In view of the deficiencies in the prior art, the purpose of the utility model is to provide a high-precision heat tracing pipe for flue gas collection.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical scheme: a high-precision heat tracing pipe for flue gas collection, comprising an inner tube for flue gas transmission, a heat tracing wire assembly wound on the outer sidewall of the inner tube, and a heat insulation layer wrapped on the outer sidewall of the heat tracing wire assembly, the heat tracing wire assembly is composed of a plurality of short heat tracing wires, each short heat tracing wire is equipped with a power supply, and the current or voltage of each short heat tracing wire can be adjusted independently through independent power supply, thereby high-precision control of the heat generated.

[0007] Preferably, the outer side wall of the heat insulation layer is sleeved with an outer protective tube, the power supplies are fixed together through the connecting plate and are fixed to the outer side wall of the outer protective tube through the L-shaped plate to support the power supplies.

[0008] Preferably, the temperature sensor is arranged on each section of the inner tube corresponding to the short heating wires to detect the temperature of each section of the inner tube.

[0009] Preferably, the temperature control device is further arranged to automatically control the temperature of each section of the inner tube corresponding to the short heating wires.

[0010] Preferably, the temperature control device comprises:

[0011] The temperature controller receives the signal from the temperature sensor, wherein the signal processing unit of the temperature controller amplifies and filters the signal, the thermistor signal needs to be converted into a voltage signal through a bridge circuit, and then the analog signal is converted into a digital signal by an analog-to-digital conversion module;

[0012] The microprocessor pre-stores a control program and a set temperature value, compares the actual temperature with the set temperature after receiving the digital signal from the temperature controller, calculates the heating power required by the heating wire according to the built-in PID control algorithm, and then obtains the signal for changing the effective value of the output current of the solid-state relay, the signal for turning on or turning off the circuit, so as to adjust the heating power of the short heating wire.

[0013] The solid-state relay adjusts the heating power of the short heating wire by changing the effective value of the output current, turning on or turning off the circuit according to the control signal of the microprocessor.

[0014] Preferably, the temperature controller has a display screen for displaying the temperature in the current section of the inner tube, so that the staff can know the temperature of each section in real time.

[0015] Preferably, the material of the heat insulation layer is aerogel felt, and the material of the outer protective tube is stainless steel.

[0016] Compared with the prior art, the utility model has the following beneficial effects:

[0017] 1. In the process of transmitting the flue gas from the sampling point such as a flue to an analysis instrument, the flue gas is heated by a plurality of short heating wires, and each short heating wire is provided with a power supply, so that the current or voltage of each short heating wire can be adjusted individually, thereby controlling the heat generated by the short heating wire with high precision and making the heating temperature more meet the actual demand of each part of the inner tube, thereby solving the problem that the long heating wire in the background art cannot guarantee the demand for heat of each part in the whole heating process.

[0018] 2. The power supply is connected to the outer protective tube through the connecting plate and the L-shaped plate, thereby supporting the power supply and avoiding that the weight of the power supply is transmitted to the short heating wire through the wire connected to the short heating wire, so that the short heating wire is not damaged.

[0019] 3、The utility model discloses still be provided with temperature control device on the heat tracing pipe, to the automatic temperature control of each section inner tube corresponding with short heat tracing wire, need not manual operation of staff. BRIEF DESCRIPTION OF DRAWINGS

[0020] The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this application, illustrate embodiments of the utility model and serve to explain the utility model without imposing any undue limitation to the utility model. In the drawings:

[0021] Figure 1 It is overall structure schematic diagram of the utility model;

[0022] Figure 2 It is A partial structure enlarged view of the utility model; Figure 1

[0023] Figure 3 It is specific structure schematic diagram after removing the heat insulation layer and outer protective tube of the utility model;

[0024] Figure 4 It is single short heat tracing wire connecting structure schematic diagram in the utility model;

[0025] In the drawing: 1, inner tube;2, heat tracing wire assembly;201, short heat tracing wire;202, power supply;203, wire;3, heat insulation layer;4, outer protective tube;5, connecting plate;6, L-shaped plate;7, temperature sensor;8, temperature control device. DETAILED DESCRIPTION

[0026] As shown in Figures 1-4 The utility model provides a kind of high-precision heat tracing pipe for smoke collection, including the inner tube 1 of smoke conveying, the heat tracing wire assembly 2 being wound on the outer side wall of inner tube 1, and the heat insulation layer 3 being wrapped on the outer side wall of heat tracing wire assembly 2, heat tracing wire assembly 2 is made of multiple short heat tracing wires 201, and each short heat tracing wire 201 is equipped with one power supply 202.

[0027] ​The utility model discloses a kind of heat tracing pipes, including inner tube 1, heat tracing wire assembly 2, heat insulation layer 3, outer protective tube 4, connecting plate 5 and L-shaped plate 6, wherein, inner tube 1 is arranged in heat tracing pipe, and heat tracing wire assembly 2 is arranged in inner tube 1, and heat insulation layer 3 is arranged in heat tracing wire assembly 2, and outer protective tube 4 is arranged in heat insulation layer 3, and connecting plate 5 and L-shaped plate 6 are arranged in outer protective tube 4.

[0028] Further, temperature sensor 7 is installed on each section of inner tube 1 corresponding to short heat tracing wire 201, and the temperature of each section of inner tube 1 is detected in real time by temperature sensor 7, and the temperature is transmitted to the staff in real time, so as to control single power supply 202 by the staff, and outer protective tube 4 is sleeved on the outer wall of heat insulation layer 3, power supply 202 is fixed together through connecting plate 5, and is fixed with the outer wall of outer protective tube 4 through L-shaped plate 6, the material of outer protective tube 4 is stainless steel, the outer protective tube 4 of stainless steel has excellent corrosion resistance, can resist the erosion of various chemical substances, at the same time, its mechanical strength is higher, can bear certain external force impact and extrusion, provides good mechanical protection for internal heat tracing wire assembly 2 and heat insulation layer 3, and power supply 202 is connected with outer protective tube 4 through connecting plate 5 and L-shaped plate 6, so as to support power supply 202, avoid the weight of power supply 202 through wire 2-3 connected with short heat tracing wire 201, and pull short heat tracing wire 201.

[0029] Finally, in order to improve the intelligent degree of heat tracing pipe, temperature control device 8 is further arranged on the heat tracing pipe of the utility model to automatically control the temperature of each section of inner tube 1 corresponding to short heat tracing wire 201, and the temperature control device 8 includes temperature controller (the temperature controller has a display screen for displaying the temperature in the current section of inner tube 1, so as to facilitate the staff to understand in real time), microprocessor and solid-state relay.

[0030] It should be noted that the temperature controller, microprocessor and solid state relay can be powered by the power supply 202, in daily use, the temperature sensor 7 senses the temperature in real time and transmits the temperature signal to the temperature controller, the signal processing unit in the temperature controller first amplifies and filters the signal, the thermistor signal also needs to be converted into a voltage signal by a bridge circuit, then the analog signal is converted into a digital signal by an analog-to-digital conversion module, the microprocessor pre-stores a control program and a set temperature value, compares the actual temperature with the set temperature after receiving the digital signal from the temperature controller, calculates the heating power required for the heat tracing wire according to the built-in PID control algorithm, and sends corresponding operation signals to the fixed relay, and the solid state relay changes the output current effective value or turns on or off the circuit to adjust the heating power of the short heat tracing wire 201 according to the control signal of the microprocessor.

[0031] The above is only a preferred embodiment of the present application, and does not limit the present application in any form; any person skilled in the art can implement the present application according to the drawings and the above description; however, any equivalent changes, modifications and evolutions made by those skilled in the art within the scope of the technical scheme of the present application, using the disclosed technical content, are equivalent embodiments of the present application; at the same time, any equivalent changes, modifications and evolutions made according to the essential technology of the present application are still within the protection scope of the technical scheme of the present application.

Claims

1. A high-precision heat tracing pipe for flue gas collection, comprising an inner pipe (1) for transporting flue gas, a heat tracing wire assembly (2) wound around the outer wall of the inner pipe (1), and a heat insulation layer (3) wrapped around the outer wall of the heat tracing wire assembly (2), characterized in that: The heat tracing wire assembly (2) consists of multiple short heat tracing wires (201), each of which is equipped with a power supply (202). The current or voltage of each short heat tracing wire (201) can be adjusted individually through the independent power supply (202), thereby controlling the heat generated by it with high precision.

2. The high-precision heat tracing pipe for flue gas collection according to claim 1, characterized in that: An outer protective tube (4) is fitted on the outer wall of the heat insulation layer (3). The power supplies (202) are fixed together by a connecting plate (5) and fixed to the outer wall of the outer protective tube (4) by an L-shaped plate (6).

3. The high-precision heat tracing pipe for flue gas collection according to claim 1, characterized in that: Temperature sensors (7) are installed on each section of the inner tube (1) corresponding to the short heating wire (201).

4. A high-precision heat tracing pipe for flue gas collection according to claim 3, characterized in that: It also includes a temperature control device (8) to automatically control the temperature of each section of the inner tube (1) corresponding to the short heating wire (201).

5. A high-precision heat tracing pipe for flue gas collection according to claim 4, characterized in that: The temperature control device (8) includes: The temperature controller receives the signal from the temperature sensor (7). The signal processing unit first amplifies and filters the signal. The resistance temperature detector signal also needs to be converted into a voltage signal by a bridge circuit. Then, the analog-to-digital converter module converts the analog signal into a digital signal. The microprocessor pre-stores the control program and set temperature value. After receiving the digital signal from the temperature controller, it compares the actual temperature with the set temperature and calculates the heating power that the heating wire needs to be adjusted according to the built-in PID control algorithm. This results in a signal to the solid-state relay to change the effective value of the output current and to connect or disconnect the circuit. Solid-state relay; adjusts the heating power of short heating wire (201) by changing the effective value of the output current and turning the circuit on or off according to the control signal of the microprocessor.

6. A high-precision heat tracing pipe for flue gas collection according to claim 5, characterized in that: The temperature controller has a display screen for displaying the current temperature inside the inner tube (1) of that section.

7. A high-precision heat tracing pipe for flue gas collection according to claim 2, characterized in that: The insulation layer (3) is made of aerogel felt, and the outer protective tube (4) is made of stainless steel.

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